All examples

From page: documents/Guides.Getting_started.html

import Editor from 'js-draw';
import 'js-draw/styles';

const editor = new Editor(document.body);
editor.addToolbar();

From page: documents/Guides.Getting_started.html

import Editor from 'js-draw';
import 'js-draw/bundledStyles';

const editor = new Editor(document.body);
editor.addToolbar();

From page: documents/Guides.Getting_started.html

<!--
	Replace 1.27.1 with the latest version of js-draw, which should be 1.28.0.
-->
<script src="https://cdn.jsdelivr.net/npm/js-draw@1.27.1/dist/bundle.js"></script>
<script>
  const editor = new jsdraw.Editor(document.body);
  editor.addToolbar();
</script>

From page: documents/Guides.Writing_a_theme.html

/* A yellowish theme! */

:root .imageEditorContainer {
	/* Try changing the below values and clicking run again! */
    /* Unselected buttons and dialog text. */
	--background-color-1: #ffff77;
	--foreground-color-1: black;

	/* Some menu/toolbar backgrounds. */
	--background-color-2: #ffff99;
	--foreground-color-2: #111;

	/* menu/toolbar backgrounds. */
	--background-color-3: #ffffaa;
	--foreground-color-3: #121100;

	/* Used for selected buttons. */
	--selection-background-color: #9f7;
	--selection-foreground-color: #00f;

	/* Used for dialog backgrounds */
	--background-color-transparent: rgba(0, 0, 100, 0.5);

	/* Used for shadows */
	--shadow-color: rgba(0, 0, 0, 0.5);

	/* Color used for some button/input foregrounds */
	--primary-action-foreground-color: #f00;

	/* Use light mode for controls. */
	color-scheme: light;
}

---ts---
import { Editor, makeEdgeToolbar, makeDropdownToolbar } from 'js-draw';
import 'js-draw/styles';
import { MaterialIconProvider } from '@js-draw/material-icons';



const makeToolbar = (newToolbar: boolean, editor: Editor) => {
	const toolbar = newToolbar ? makeEdgeToolbar(editor) : makeDropdownToolbar(editor);
	toolbar.addDefaults();

	toolbar.addExitButton(() => {
		alert('Not implemented for this editor!');
	});

	toolbar.addSaveButton(() => {
		const saveData = editor.toSVG().outerHTML;

		// Do something with saveData
		alert('Not implemented for this editor!');
	});

	return toolbar;
};

const makeEditor = async () => {
	const editor = new Editor(document.body, {
		iconProvider: new MaterialIconProvider(),
    	wheelEventsEnabled: 'only-if-focused',
	});

	// Template generated with https://js-draw.web.app/
	await editor.loadFromSVG(`
		<svg viewBox="0 0 500 500" width="500" height="500" version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
			<g class="js-draw-image-background js-draw-image-background-grid js-draw-image-background-grid-25">
				<path d="M500,500L500,0L0,0L0,500L500,500" fill="#f1ffa4"></path>
				<path d="M0,0L500,0M0,25L500,25M0,50L500,50M0,75L500,75M0,100L500,100M0,125L500,125M0,150L500,150M0,175L500,175M0,200L500,200M0,225L500,225M0,250L500,250M0,275L500,275M0,300L500,300M0,325L500,325M0,350L500,350M0,375L500,375M0,400L500,400M0,425L500,425M0,450L500,450M0,475L500,475M0,500L500,500M0,0L0,500M25,0L25,500M50,0L50,500M75,0L75,500M100,0L100,500M125,0L125,500M150,0L150,500M175,0L175,500M200,0L200,500M225,0L225,500M250,0L250,500M275,0L275,500M300,0L300,500M325,0L325,500M350,0L350,500M375,0L375,500M400,0L400,500M425,0L425,500M450,0L450,500M475,0L475,500M500,0L500,500" fill="none" stroke="#0e005b33" stroke-width=".7"></path>
			</g>
		</svg>
	`);

	let isNewToolbar = true;
	let toolbar = makeToolbar(isNewToolbar, editor);

	const toolbarSelector = document.createElement('button');
	toolbarSelector.innerText = 'Change toolbar type';
	document.body.appendChild(toolbarSelector);

	toolbarSelector.onclick = () => {
		isNewToolbar = !isNewToolbar;
		toolbar.remove();

		toolbar = makeToolbar(isNewToolbar, editor);
	};
};

makeEditor();

From page: documents/Guides.Components.Adding_and_modifying_components.html

import {
	Editor, EditorImage, Stroke, Path, Color4,
} from 'js-draw';

// 1.
const editor = new Editor(document.body);
editor.addToolbar();

// Create path data that we'll use to make the stroke.
const path = Path.fromString('m0,0 l0,40 l40,4 l0,-48 z');

// 2.
const stroke = Stroke.fromFilled(
	path, Color4.red,
);

// 3.
const command = editor.image.addComponent(stroke);

// 4.
editor.dispatch(command);

From page: documents/Guides.Components.Adding_and_modifying_components.html

import {
	Editor, EditorImage, Stroke, Path, Color4, uniteCommands,
} from 'js-draw';

const editor = new Editor(document.body);
editor.addToolbar();

// 1.
const commands = [];
for (let x = 0; x < 100; x += 10) {
	for (let y = 0; y < 100; y += 10) {
		// 2. Try changing these!
		const strokeWidth = 3;
		const strokeColor = Color4.orange;

		// 3.
		const stroke = Stroke.fromStroked(
			// A path that starts at (i,i) then moves three units to the right
			`m${x},${y} l3,0`,
			{ width: strokeWidth, color: strokeColor },
		);
		const command = editor.image.addComponent(stroke);
		commands.push(command);
	}
}

// 4.
const compoundCommand = uniteCommands(commands);
editor.dispatch(compoundCommand);

From page: documents/Guides.Components.Adding_and_modifying_components.html

---use-previous---
---visible---
// This example starts by running the code from the previous example --
// make sure the previous example compiles!
import { Rect2 } from 'js-draw';

// 1.
const components = editor.image.getComponentsIntersecting(
	new Rect2( // a 2D rectangle
		5, // x
		6, // y
		60, // width
		30, // height
	)
);

// 2.
const styleCommands = [];
for (const component of components) {
	// Only process Strokes -- there **are** other types of components.
	if (!(component instanceof Stroke)) continue;

	const command = component.updateStyle({ color: Color4.red });
	styleCommands.push(command);
}
// 3.
editor.dispatch(uniteCommands(styleCommands));

From page: documents/Guides.Components.Adding_and_modifying_components.html

---use-previous---
---visible---
// This example starts by running the code from the previous example --
// make sure the previous example compiles!
import { Mat33, Vec2 } from 'js-draw';

const transformCommands = [];
for (const component of components) {
	const command = component.transformBy(
		Mat33.translation(Vec2.of(45, 0))
	);
	transformCommands.push(command);
}
editor.dispatch(uniteCommands(transformCommands));

From page: documents/Guides.Components.Adding_and_modifying_components.html

---use-previous---
---visible---
// This example starts by running the code from the previous example --
// make sure the previous example compiles!
import { Erase } from 'js-draw';

// Deletes all components found in the previous steps
const eraseCommand = new Erase(components);
editor.dispatch(eraseCommand);

From page: documents/Guides.Components.Custom_components.html

import { Editor } from 'js-draw';
const editor = new Editor(document.body);
editor.addToolbar();

From page: documents/Guides.Components.Custom_components.html

---use-previous---
---visible---
import { LineSegment2, Mat33, Rect2, Color4 } from '@js-draw/math';
import { AbstractRenderer, AbstractComponent } from 'js-draw';

const componentId = 'example';
class ExampleComponent extends AbstractComponent {
	protected contentBBox: Rect2;

	public constructor() {
		super(componentId);

		// For now, create a 50x50 bounding box centered at (0,0).
		// We'll update this later:
		this.contentBBox = new Rect2(0, 0, 50, 50);
	}

	public override render(canvas: AbstractRenderer, _visibleRect?: Rect2): void {
		// Be sure that everything drawn between .startObject and .endObject is within contentBBox.
		// Content outside contentBBox may not be drawn in all cases.
		canvas.startObject(this.contentBBox);

		// _visibleRect is the part of the image that's currently visible. We can
		// ignore it for now.

		canvas.fillRect(this.contentBBox, Color4.red);

		// Ends the object and attaches any additional metadata attached by an image loader
		// (e.g. if this object was created by SVGLoader).
		canvas.endObject(this.getLoadSaveData());
	}

	// Must be implemented by all components, used for things like erasing and selection.
	public intersects(line: LineSegment2) {
		// TODO: For now, our component won't work correctly if the user tries to select it.
		// We'll implement this later.
		return false;
	}

	protected applyTransformation(transformation: Mat33): void {
		// TODO: Eventually, this should move the component. We'll implement this later.
	}

	protected createClone(): AbstractComponent {
		return new ExampleComponent();
	}

	public description(): string {
		// This should be a brief description of the component's content (for
		// accessibility tools)
		return 'a red box';
	}

	protected serializeToJSON() {
		return JSON.stringify({
			// Some data to save (for collaborative editing)
		});
	}
}

// data: The data serialized by serlailzeToJSON
AbstractComponent.registerComponent(componentId, data => {
	// TODO: Deserialize the component from [data]. This is used if collaborative
	// editing is enabled.
	return new ExampleComponent();
});

// Add the component
editor.dispatch(editor.image.addComponent(new ExampleComponent()));

From page: documents/Guides.Components.Custom_components.html

import { Editor } from 'js-draw';
const editor = new Editor(document.body);
editor.addToolbar();
---visible---
import { LineSegment2, Mat33, Rect2, Color4 } from '@js-draw/math';
import { AbstractRenderer, AbstractComponent } from 'js-draw';

const componentId = 'example';
class ExampleComponent extends AbstractComponent {
	protected contentBBox: Rect2;

	// NEW: Stores the scale/rotation/position. "Transform" is short for "transformation".
	private transform: Mat33;
	// NEW: Stores the untransformed bounding box of the component. If the component hasn't
	// been moved/scaled yet, initialBBox should completely contain the component's content.
	private initialBBox: Rect2;

	public constructor(transform: Mat33) {
		super(componentId);

		this.transform = transform;
		this.initialBBox = new Rect2(0, 0, 50, 50);
		this.updateBoundingBox();
	}

	// NEW: Updates this.contentBBox. Should be called whenever this.transform changes.
	private updateBoundingBox() {
		this.contentBBox = this.initialBBox.transformedBoundingBox(
			this.transform,
		);
	}

	public override render(canvas: AbstractRenderer, _visibleRect?: Rect2): void {
		canvas.startObject(this.contentBBox);

		// Everything between .pushTransform and .popTransform will be scaled/rotated by this.transform.
		// Try removing the .pushTransform and .popTransform lines!
		canvas.pushTransform(this.transform);
		canvas.fillRect(this.initialBBox, Color4.red);
		canvas.popTransform();

		// After the call to .popTransform, this.transform is no longer transforming the canvas.
		// Try uncommenting the following line:
		// canvas.fillRect(this.initialBBox, Color4.orange);
		// What happens when the custom component is selected and moved?
		// What happens to the orange rectangle when the red rectangle is moved offscreen?

		canvas.endObject(this.getLoadSaveData());
	}

	public intersects(line: LineSegment2) {
		// Our component is currently just a rectangle. As such (for some values of this.transform),
		// we can use the Rect2.intersectsLineSegment method here:
		const intersectionCount = this.contentBBox.intersectsLineSegment(line).length;
		return intersectionCount > 0; // What happpens if you always return `true` here?
	}

	protected applyTransformation(transformUpdate: Mat33): void {
		// `.rightMul`, "right matrix multiplication" combines two transformations.
		// The transformation on the left is applied **after** the transformation on the right.
		// As such, `transformUpdate.rightMul(this.transform)` means that `this.transform`
		// will be applied **before** the `transformUpdate`.
		this.transform = transformUpdate.rightMul(this.transform);
		this.updateBoundingBox();
	}

	protected createClone(): AbstractComponent {
		const clone = new ExampleComponent(this.transform);
		return clone;
	}

	public description(): string {
		return 'a red box';
	}

	protected serializeToJSON() {
		return JSON.stringify({
			// TODO: Some data to save (for collaborative editing)
		});
	}
}

// data: The data serialized by serlailzeToJSON
AbstractComponent.registerComponent(componentId, data => {
	// TODO: Deserialize the component from [data]. This is used if collaborative
	// editing is enabled.
	return new ExampleComponent(Mat33.identity);
});

// Add the component
const initialTransform = Mat33.identity;
editor.dispatch(editor.image.addComponent(new ExampleComponent(initialTransform)));

From page: documents/Guides.Components.Custom_components.html

import { Editor, SVGLoaderPlugin, Stroke } from 'js-draw';
import { Color4 } from '@js-draw/math';

let nextX = 0;
const testPlugin: SVGLoaderPlugin = {
	async visit(node, loader) {
		if (node.tagName.toLowerCase() === 'text') {
			const testComponent = Stroke.fromFilled(
				`m${nextX},0 l50,0 l0,50 z`, Color4.red,
			);
			nextX += 100;
			loader.addComponent(testComponent);
			return true;
		}
		// Return false to do the default image loading
		return false;
	}
};

const editor = new Editor(document.body, {
	svg: {
		loaderPlugins: [ testPlugin ],
	}
});
editor.addToolbar();

// With the loader plugin, text objects are converted to red triangles.
editor.loadFromSVG(`
	<svg>
		<text>test</text>
		<text y="50">test 2</text>
		<text y="100">test 3</text>
	</svg>
`);

From page: documents/Guides.Components.Custom_components.html

import { Editor } from 'js-draw';
import { LineSegment2, Mat33, Rect2, Color4 } from '@js-draw/math';
import { AbstractRenderer, AbstractComponent } from 'js-draw';

const componentId = 'example';
class ExampleComponent extends AbstractComponent {
	protected contentBBox: Rect2;

	private transform: Mat33;
	private initialBBox: Rect2;

	public constructor(transform: Mat33) {
		super(componentId);

		this.transform = transform;
		this.initialBBox = new Rect2(0, 0, 50, 50);
		this.updateBoundingBox();
	}

	private updateBoundingBox() {
		this.contentBBox = this.initialBBox.transformedBoundingBox(
			this.transform,
		);
	}

	public override render(canvas: AbstractRenderer, _visibleRect?: Rect2): void {
		canvas.startObject(this.contentBBox);

		canvas.pushTransform(this.transform);
		canvas.fillRect(this.initialBBox, Color4.red);
		canvas.popTransform();

		const containerClassNames = ['comp--example-component'];
		canvas.endObject(this.getLoadSaveData(), containerClassNames);
	}

	public intersects(line: LineSegment2) {
		// Our component is currently just a rectangle. As such (for some values of this.transform),
		// we can use the Rect2.intersectsLineSegment method here:
		const intersectionCount = this.contentBBox.intersectsLineSegment(line).length;
		return intersectionCount > 0; // What happpens if you always return `true` here?
	}

	protected applyTransformation(transformUpdate: Mat33): void {
		// `.rightMul`, "right matrix multiplication" combines two transformations.
		// The transformation on the left is applied **after** the transformation on the right.
		// As such, `transformUpdate.rightMul(this.transform)` means that `this.transform`
		// will be applied **before** the `transformUpdate`.
		this.transform = transformUpdate.rightMul(this.transform);
		this.updateBoundingBox();
	}

	protected createClone(): AbstractComponent {
		const clone = new ExampleComponent(this.transform);
		return clone;
	}

	public description(): string {
		return 'a red box';
	}

	protected serializeToJSON() {
		return JSON.stringify({
			// TODO: Some data to save (for collaborative editing)
		});
	}
}

AbstractComponent.registerComponent(componentId, data => {
	// TODO:
	return new ExampleComponent(Mat33.identity);
});

const plugin: SVGLoaderPlugin = {
	async visit(node, loader) {
		if (node.classList.contains('comp--example-component')) {
			// TODO: Set the transformation matrix correctly -- get this information
			// from the `node`. This isn't too important for copy/paste support.
			const customComponent = new ExampleComponent(Mat33.identity);
			loader.addComponent(customComponent);
			return true;
		}
		// Return false to do the default image loading
		return false;
	},
};

const editor = new Editor(document.body, {
	svg: {
		loaderPlugins: [ plugin ],
	},
});
editor.addToolbar();

// Add the component
const initialTransform = Mat33.identity;
editor.dispatch(editor.image.addComponent(new ExampleComponent(initialTransform)));

From page: documents/Guides.Components.Custom_components.html

import { Editor, invertCommand, SerializableCommand, EditorEventType } from 'js-draw';

const editor1 = new Editor(document.body);
// Store the toolbar in a variable -- we'll use it later
const toolbar = editor1.addToolbar();

const editor2 = new Editor(document.body);
editor2.addToolbar();

const applySerializedCommand = (serializedCommand: any, editor: Editor) => {
	const command = SerializableCommand.deserialize(serializedCommand, editor);
	command.apply(editor);
};

const applyCommandsToOtherEditor = (sourceEditor: Editor, otherEditor: Editor) => {
	sourceEditor.notifier.on(EditorEventType.CommandDone, (evt) => {
		// Type assertion.
		if (evt.kind !== EditorEventType.CommandDone) {
			throw new Error('Incorrect event type');
		}

		if (evt.command instanceof SerializableCommand) {
			const serializedCommand = evt.command.serialize();
			applySerializedCommand(serializedCommand, otherEditor);
		} else {
			console.log('Nonserializable command');
		}
	});
	sourceEditor.notifier.on(EditorEventType.CommandUndone, (evt) => {
		// Type assertion.
		if (evt.kind !== EditorEventType.CommandUndone) {
			throw new Error('Incorrect event type');
		}

		if (evt.command instanceof SerializableCommand) {
			const serializedCommand = invertCommand(evt.command).serialize();
			applySerializedCommand(serializedCommand, otherEditor);
		} else {
			console.log('Nonserializable command');
		}
	});
};

applyCommandsToOtherEditor(editor1, editor2);
applyCommandsToOtherEditor(editor2, editor1);

From page: documents/Guides.Components.Custom_components.html

---use-previous---
import { Editor } from 'js-draw';
import { LineSegment2, Mat33, Rect2, Color4 } from '@js-draw/math';
import { AbstractRenderer, AbstractComponent } from 'js-draw';

const componentId = 'example';
class ExampleComponent extends AbstractComponent {
	protected contentBBox: Rect2;

	private transform: Mat33;
	private initialBBox: Rect2;

	public constructor(transform: Mat33) {
		super(componentId);

		this.transform = transform;
		this.initialBBox = new Rect2(0, 0, 50, 50);
		this.updateBoundingBox();
	}

	private updateBoundingBox() {
		this.contentBBox = this.initialBBox.transformedBoundingBox(
			this.transform,
		);
	}

	public override render(canvas: AbstractRenderer, _visibleRect?: Rect2): void {
		canvas.startObject(this.contentBBox);

		canvas.pushTransform(this.transform);
		canvas.fillRect(this.initialBBox, Color4.red);
		canvas.popTransform();

		const containerClassNames = ['comp--example-component'];
		canvas.endObject(this.getLoadSaveData(), containerClassNames);
	}

	public intersects(line: LineSegment2) {
		// Our component is currently just a rectangle. As such (for some values of this.transform),
		// we can use the Rect2.intersectsLineSegment method here:
		const intersectionCount = this.contentBBox.intersectsLineSegment(line).length;
		return intersectionCount > 0; // What happpens if you always return `true` here?
	}

	protected applyTransformation(transformUpdate: Mat33): void {
		// `.rightMul`, "right matrix multiplication" combines two transformations.
		// The transformation on the left is applied **after** the transformation on the right.
		// As such, `transformUpdate.rightMul(this.transform)` means that `this.transform`
		// will be applied **before** the `transformUpdate`.
		this.transform = transformUpdate.rightMul(this.transform);
		this.updateBoundingBox();
	}

	protected createClone(): AbstractComponent {
		const clone = new ExampleComponent(this.transform);
		return clone;
	}

	public description(): string {
		return 'a red box';
	}

---visible---
	// ...other component logic...

	protected serializeToJSON() {
		return JSON.stringify({
			// NEW: Save the transform matrix:
			transform: this.transform.toArray(),
		});
	}
}

AbstractComponent.registerComponent(componentId, data => {
	const transformArray = JSON.parse(data).transform;

	// NEW: Validation
	if (!Array.isArray(transformArray)) {
		throw new Error('data.transform must be an array');
	}
	for (const entry of transformArray) {
		if (!isFinite(entry)) {
			throw new Error(`Non-finite entry in transform: ${entry}`);
		}
	}

	// NEW: Create and return the component from the data
	const transform = new Mat33(...transformArray);
	return new ExampleComponent(transform);
});

// Make a button that adds the component
function makeAddIcon() {
	const container = document.createElement('div');
	container.textContent = '+';
	return container;
}

toolbar.addActionButton({
	icon: makeAddIcon(),
	label: 'Add test component',
}, () => {
	const initialTransform = Mat33.identity;
	const component = new ExampleComponent(initialTransform);

	// The addAndCenterComponents method automatically selects,
	// centers, and adds the provided components to the editor.
	//
	// We could also add the component using
	// editor.dispatch(editor.image.addComponent(component));
	editor1.addAndCenterComponents([
		component
	]);
});

From page: documents/Guides.Components.Custom_components.html

import { Editor, CanvasRenderer, SVGRenderer } from 'js-draw';
import { LineSegment2, Mat33, Rect2, Color4 } from '@js-draw/math';
import { AbstractRenderer, AbstractComponent } from 'js-draw';

const componentId = 'example';
class ExampleComponent extends AbstractComponent {
	protected contentBBox: Rect2;

	private transform: Mat33;
	private initialBBox: Rect2;

	public constructor(transform: Mat33) {
		super(componentId);

		this.transform = transform;
		this.initialBBox = new Rect2(0, 0, 50, 50);
		this.updateBoundingBox();
	}

	private updateBoundingBox() {
		this.contentBBox = this.initialBBox.transformedBoundingBox(
			this.transform,
		);
	}

	public override render(canvas: AbstractRenderer, _visibleRect?: Rect2): void {
		canvas.startObject(this.contentBBox);

		canvas.pushTransform(this.transform);
		if (canvas instanceof CanvasRenderer) {
			canvas.drawWithRawRenderingContext(ctx => {
				ctx.strokeStyle = 'green';

				// Draw a large number of rectangles
				const rectSize = 20;
				const maximumX = this.initialBBox.width - rectSize;
				for (let x = 0; x < maximumX; x += 2) {
					ctx.strokeRect(x, 0, rectSize, rectSize);
				}
			});
		} else if (canvas instanceof SVGRenderer) {
			canvas.drawWithSVGParent(parent => {
				// Draw some text. Note that this can also
				// be done with canvas.drawText
				const text = document.createElementNS(
					'http://www.w3.org/2000/svg', 'text',
				);

				text.textContent = 'Text in an SVG element!';
				text.setAttribute('x', '50');
				text.setAttribute('y', '25');
				text.style.fill = 'red';

				parent.appendChild(text);
			});
		} else {
			// Fallback for other renderers
			canvas.fillRect(this.initialBBox, Color4.red);
		}
		canvas.popTransform();

		const containerClassNames = ['comp--example-component'];
		canvas.endObject(this.getLoadSaveData(), containerClassNames);
	}

	public intersects(line: LineSegment2) {
		return false; // TODO (see above sections for implementation)
	}

	protected applyTransformation(transformUpdate: Mat33): void {
		this.transform = transformUpdate.rightMul(this.transform);
		this.updateBoundingBox();
	}

	protected createClone(): AbstractComponent {
		const clone = new ExampleComponent(this.transform);
		return clone;
	}

	public description(): string {
		return 'a red box'; // TODO (see examples above)
	}

	protected serializeToJSON() {
		return JSON.stringify({
			// TODO: Some data to save (for collaborative editing)
		});
	}
}

AbstractComponent.registerComponent(componentId, data => {
	// TODO: See above examples for how to implement this
	// Needed for collaborative editing
	throw new Error('Not implemented');
});

const editor = new Editor(document.body);
editor.addToolbar();

// Add the component
const initialTransform = Mat33.identity;
editor.dispatch(editor.image.addComponent(new ExampleComponent(initialTransform)));

// Preview the SVG output
document.body.appendChild(editor.toSVG());

From page: documents/Guides.Updating_the_viewport.html

import { Editor, Viewport, Mat33 } from 'js-draw';
const editor = new Editor(document.body); // 1
editor.addToolbar();

const command = Viewport.transformBy(Mat33.scaling2D(1/4)); // 2
editor.dispatch(command); // 3

From page: documents/Guides.Updating_the_viewport.html

import { Editor, Viewport, Mat33 } from 'js-draw';
const editor = new Editor(document.body); // 1
editor.addToolbar();

---visible---
const command = Viewport.transformBy(Mat33.scaling2D(1/4)); // 2
editor.dispatch(command, false); // false: Don't add to history

// Alternatively,
// command.apply(editor);

From page: documents/Guides.Updating_the_viewport.html

import { Editor } from 'js-draw';

// Create an editor with a toolbar:
const editor = new Editor(document.body);
editor.addToolbar();

From page: documents/Guides.Updating_the_viewport.html

---use-previous---
---visible---
import { Color4, BackgroundComponentBackgroundType } from 'js-draw';

editor.dispatch(
  editor.setBackgroundStyle({
    color: Color4.orange,
    type: BackgroundComponentBackgroundType.Grid,

	// Make the background autoresize so that it's always
	// visible:
	autoresize: true,
  }),
);

From page: documents/Guides.Updating_the_viewport.html

---use-previous---
---visible---
import { Viewport } from 'js-draw';
import { Mat33, Vec2 } from '@js-draw/math';

// When moveLeftUpdate is applied to the viewport, it moves the
// canvas to the left by 1 unit. This is the same as moving the viewport
// to the right by one unit.
const moveLeftUpdate = Mat33.translation(Vec2.of(-1, 0));

function update() {
	const moveLeftCommand = Viewport.transformBy(moveLeftUpdate);
	moveLeftCommand.apply(editor);

	requestAnimationFrame(update);
}
update();

From page: documents/Guides.Updating_the_viewport.html

import { Editor } from 'js-draw';
import { Color4, BackgroundComponentBackgroundType } from 'js-draw';

const editor = new Editor(document.body);
editor.addToolbar();

editor.dispatch(
  editor.setBackgroundStyle({
    color: Color4.orange,
    type: BackgroundComponentBackgroundType.Grid,
	autoresize: true,
  }),
);

---visible---
import { Viewport } from 'js-draw';
import { Mat33, Vec2 } from '@js-draw/math';

let lastTime = performance.now();
function update() {
	// Get how long many milliseconds have elapsed since the last update.
	const nowTime = performance.now();
	const millisecondsElapsed = nowTime - lastTime;
	const seconds = millisecondsElapsed / 1000;
	lastTime = nowTime;

	const moveLeftRate = -10; // units/second
	const moveLeftAmount = Vec2.of(moveLeftRate * seconds, 0);
	const moveLeftUpdate = Mat33.translation(moveLeftAmount);
	const moveLeftCommand = Viewport.transformBy(
		moveLeftUpdate
	);
	moveLeftCommand.apply(editor);

	requestAnimationFrame(update);
}
update();

From page: documents/Guides.Customizing_existing_tools.html

import {
	Editor, PenTool, Color4
} from 'js-draw';
import 'js-draw/styles';
const editor = new Editor(document.body, {
	wheelEventsEnabled: 'only-if-focused',
});

// The toolbar can be added either before or after changing the tool.
editor.addToolbar();

// Get all tools of type PenTool (we could also do this with an EraserTool).
const penTools = editor.toolController.getMatchingTools(PenTool);

// Get the second pen tool (somewhat fragile -- js-draw might change
// the default toolbar configuration in a future major release).
const secondPen = penTools[1];

secondPen.setThickness(200);
secondPen.setColor(Color4.red);

From page: documents/Guides.Customizing_existing_tools.html

import {
	Editor, PenTool, Color4, makeOutlinedCircleBuilder,
} from 'js-draw';
import 'js-draw/styles';
const editor = new Editor(document.body, {
	wheelEventsEnabled: 'only-if-focused',
});

const toolController = editor.toolController;

const originalPenTools = toolController.getMatchingTools(PenTool);

// Add a new pen after the existing
const penStyle: PenStyle = {
	color: Color4.red,
	// Draw circles by default
	factory: makeOutlinedCircleBuilder,
	thickness: 4,
};

const newPen = new PenTool(editor, 'My custom pen', penStyle);

// Add after the first pre-existing pen tool
toolController.insertToolsAfter(originalPenTools[0], [ newPen ]);

// Remove the previous pen tools
toolController.removeAndDestroyTools(originalPenTools);

// Make the new pen a primary tool -- it disables other primary tools
// when the user first enables it (like the default eraser/text tool/pens)
toolController.addPrimaryTool(newPen);

// Must be done after changing the tools:
editor.addToolbar();

From page: documents/Guides.Customizing_existing_tools.html

import { Editor, makePolylineBuilder, makeOutlinedCircleBuilder, ComponentBuilderFactory } from 'js-draw';

// A pen factory's job is to return a ComponentBuilder when starting a new stroke.
// Below, we randomly choose between a circle ComponentBuilder and a polyline pen ComponentBuilder.
//
// Parameters:
//   startPoint - the first point on the stroke.
//   viewport - information about the current rotation/scale of the drawing canvas.
const customPenFactory: ComponentBuilderFactory = (startPoint, viewport) => {
	// Randomly choose either a polyline or a circle for this stroke.
	if (Math.random() < 0.5) {
		return makePolylineBuilder(startPoint, viewport);
	} else {
		return makeOutlinedCircleBuilder(startPoint, viewport);
	}
};

const editor = new Editor(document.body, {
	pens: {
		// The polyline is already present by default --
		additionalPenTypes: [{
			name: 'Polyline pen',
			id: 'custom-polyline',
			factory: customPenFactory,

			// The pen doesn't create fixed shapes (e.g. squares, rectangles, etc)
			// and so should go under the "pens" section.
			isShapeBuilder: false,
		}],
	},
});
editor.addToolbar();

From page: documents/Guides.Customizing_existing_tools.html

---use-previous---
---visible---
import { PenTool } from 'js-draw';

const firstPen = editor.toolController.getMatchingTools(PenTool)[0];
firstPen.setStrokeFactory(customPenFactory);

From page: documents/Guides.Customizing_existing_tools.html

import {
	pathToRenderable, Path, Stroke, ComponentBuilderFactory, Point2, Vec2, Rect2, Color4, Viewport, StrokeDataPoint, RenderingStyle, PathCommandType, ComponentBuilder, AbstractRenderer
} from 'js-draw';


///
/// The custom ComponentBuilder
///
/// This class handles conversion between input data (for example, as generated
/// by a mouse) and AbstractComponents that will be added to the drawing.
///

class CustomBuilder implements ComponentBuilder {
	private path: Path;
	private renderingStyle: RenderingStyle;
	private lastPoint: Point2;

	public constructor(
		startPoint: StrokeDataPoint,

		// We'll use sizeOfScreenPixelOnCanvas later, to round points
		// based on the current zoom level.
		private sizeOfScreenPixelOnCanvas: number
	) {
		// Round points based on the current zoom to prevent the saved SVG
		// from having large decimals.
		const startPosition = this.roundPoint(startPoint.pos);

		// Initially, just a point:
		this.path = new Path(startPosition, []);

		this.renderingStyle = {
			// No fill
			fill: Color4.transparent,

			stroke: {
				color: startPoint.color,

				// For now, the custom pen has a constant width based on the first
				// point.
				width: startPoint.width,
			},
		};

		this.lastPoint = startPosition;
	}

	// Returns the bounding box of the stroke drawn so far. This box should contain
	// all points in the stroke.
	public getBBox(): Rect2 {
		return this.path.bbox;
	}

	// Called to build the final version of the stroke.
	public build(): Stroke {
		return new Stroke([ pathToRenderable(this.path, this.renderingStyle) ]);
	}

	// Called while building the stroke. This is separate from .build() to
	// allow for greater efficiency (.build creates the final version, .preview
	// can be a fast preview).
	public preview(renderer: AbstractRenderer) {
		// For simplicity, use the same final shape as the preview.
		const stroke = this.build();
		stroke.render(renderer);
	}

	private roundPoint(point: Point2): Point2 {
		// Because js-draw supports a very large zoom range, we round differently
		// at different zoom levels. sizeOfScreenPixelOnCanvas is based on the current zoom level.
		return Viewport.roundPoint(point, this.sizeOfScreenPixelOnCanvas);
	}

	// .addPoint is called when a new point of input data has been received.
	// newPoint contains color, pressure, and position information.
	public addPoint(newPoint: StrokeDataPoint) {
		// Create a new point based on the input data, plus some randomness!
		const size = newPoint.width * 4;
		const newPos = newPoint.pos.plus(
			Vec2.of(Math.random() * size - size/2, Math.random() * size - size/2)
		);

		// Round the point to prevent long decimal values when saving to SVG.
		const roundedPoint = this.roundPoint(newPos);

		this.path = new Path(this.path.startPoint, [
			...this.path.parts,
			{
				kind: PathCommandType.LineTo,
				point: roundedPoint,
			},
		]);
	}
}

///
/// The custom ComponentBuilderFactory
///


// A ComponentBuilderFactory is responsible for creating instances of a
// ComponentBuilder. It's what we'll provide to js-draw.
export const makeCustomBuilder: ComponentBuilderFactory =
	(initialPoint: StrokeDataPoint, viewport: Viewport) => {
		const sizeOfScreenPixelOnCanvas = viewport.getSizeOfPixelOnCanvas();
		return new CustomBuilder(initialPoint, sizeOfScreenPixelOnCanvas);
	};


///
/// The editor
///

import { Editor } from 'js-draw';

const editor = new Editor(document.body, {
	pens: {
		additionalPenTypes: [{
			name: 'Wavy pen',
			id: 'wavy-lines',
			factory: makeCustomBuilder,

			// Put under the "pens" section.
			isShapeBuilder: false,
		}],
	},
});

editor.addToolbar();

///
/// Select our custom pen by default.
///

import { PenTool } from 'js-draw';

const firstPen = editor.toolController.getMatchingTools(PenTool)[0];
firstPen.setStrokeFactory(makeCustomBuilder);

From page: documents/Guides.Positioning_an_element_above_the_editor.html

import { Editor } from 'js-draw';

// Adds the editor to document.body:
const editor = new Editor(document.body); // 1
editor.addToolbar();

From page: documents/Guides.Positioning_an_element_above_the_editor.html

---use-previous---
---visible---
const button = document.createElement('button');
button.textContent = 'Example!';
button.style.position = 'absolute';

From page: documents/Guides.Positioning_an_element_above_the_editor.html

---use-previous---
---visible---
import { Mat33, Vec2 } from '@js-draw/math';

const positioning = Mat33.translation(Vec2.of(10, 20));
const anchor = editor.anchorElementToCanvas(button, positioning);

From page: documents/Guides.Positioning_an_element_above_the_editor.html

---use-previous---
---visible---
button.onclick = () => {
	anchor.remove();
};

From page: documents/Migrations.Migrating_to_version_1.html

:root .imageEditorContainer {
    /* Used for unselected buttons and dialog text. */
	--background-color-1: white;
	--foreground-color-1: black;

	/* Used for some menu/toolbar backgrounds. */
	--background-color-2: #f5f5f5;
	--foreground-color-2: #2c303a;

	/* Used for other menu/toolbar backgrounds. */
	--background-color-3: #e5e5e5;
	--foreground-color-3: #1c202a;

	/* Used for selected buttons. */
	--selection-background-color: #cbdaf1;
	--selection-foreground-color: #2c303a;

	/* Used for dialog backgrounds */
	--background-color-transparent: rgba(105, 100, 100, 0.5);

	/* Used for shadows */
	--shadow-color: rgba(0, 0, 0, 0.5);

	/* Color used for some button/input foregrounds */
	--primary-action-foreground-color: #15b;
}

---ts---
import { Editor, makeEdgeToolbar, makeDropdownToolbar } from 'js-draw';
import 'js-draw/styles';
import { MaterialIconProvider } from '@js-draw/material-icons';



const makeToolbar = (newToolbar: boolean, editor: Editor) => {
	const toolbar = newToolbar ? makeEdgeToolbar(editor) : makeDropdownToolbar(editor);
	toolbar.addDefaults();

	toolbar.addExitButton(() => {
		alert('Not implemented for this editor!');
	});

	toolbar.addSaveButton(() => {
		const saveData = editor.toSVG().outerHTML;

		// Do something with saveData
		alert('Not implemented for this editor!');
	});

	return toolbar;
};

const makeEditor = async () => {
	const editor = new Editor(document.body, {
		iconProvider: new MaterialIconProvider(),
    	wheelEventsEnabled: 'only-if-focused',
	});

	// Loads from SVG data
	await editor.loadFromSVG(`
		<svg viewBox="0 0 500 500" width="500" height="500" version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
			<style id="js-draw-style-sheet">path{stroke-linecap:round;stroke-linejoin:round;}text{white-space:pre;}</style>
			<path d="M500,500L500,0L0,0L0,500L500,500" fill="#e3e3e3" class="js-draw-image-background"></path>
			<text style="transform: matrix(1, 0, 0, 1, 57, 192); font-family: sans-serif; font-size: 32px; fill: rgb(0, 0, 0);">Testing...</text>
		</svg>
	`);

	let isNewToolbar = true;
	let toolbar = makeToolbar(isNewToolbar, editor);



	const toolbarSelector = document.createElement('button');
	toolbarSelector.innerText = 'Change toolbar type';
	document.body.appendChild(toolbarSelector);

	toolbarSelector.onclick = () => {
		isNewToolbar = !isNewToolbar;
		toolbar.remove();

		toolbar = makeToolbar(isNewToolbar, editor);
	};
};

makeEditor();

From page: documents/Migrations.Migrating_to_version_1.html

import {
	Editor, makeEdgeToolbar, makeDropdownToolbar, AbstractToolbar
} from 'js-draw';
import 'js-draw/styles';

// Also use the new icon pack:
import { MaterialIconProvider } from '@js-draw/material-icons';

let toolbar: AbstractToolbar|null = null
let isDropdownToolbar: boolean = true;

const makeToolbar = (editor: Editor) => {
	// Remove the old toolbar (if any).
	if (toolbar) {
		toolbar.remove();
	}

	// Create the new toolbar
	if (isDropdownToolbar) {
		toolbar = makeDropdownToolbar(editor);
	} else {
		toolbar = makeEdgeToolbar(editor);
	}

	// Add the default action buttons to the toolbar
	toolbar.addDefaults();

	// Add a toggle button
	toolbar.addActionButton({
		// An icon that looks similar to an arrow:
		icon: editor.icons.makeDropdownIcon(),
		label: 'Change toolbar type'
	}, () => {
		isDropdownToolbar = !isDropdownToolbar;
		makeToolbar(editor);
	});

	// Optional: Add save/exit buttons:
	// toolbar.addExitButton(() => { });
	// toolbar.addSaveButton(() => { });

	return toolbar;
};

// Creates the edior and adds it to the document
const makeEditor = () => {
	const editor = new Editor(document.body, {
		iconProvider: new MaterialIconProvider(),
    	wheelEventsEnabled: 'only-if-focused',
	});

	makeToolbar(editor);
};

makeEditor();

From page: documents/Migrations.Migrating_to_version_1.html

import {
	Editor, PenTool, PenStyle, Color4,
	makeOutlinedCircleBuilder, makeFreehandLineBuilder
} from 'js-draw';
import 'js-draw/styles';

const editor = new Editor(document.body, {
    wheelEventsEnabled: 'only-if-focused',
});

const penStyle: PenStyle = {
	color: Color4.red,
	// Try changing this to makeFreehandLineBuilder
	factory: makeOutlinedCircleBuilder,
	thickness: 4,
};

editor.toolController.addPrimaryTool(
	new PenTool(editor, 'Some description here', penStyle),
);


// Add the toolbar **after** adding the new tool.
editor.addToolbar();

From page: modules/js-draw.html

import { Editor, Vec3, Mat33, EditorSettings, ShortcutManager } from 'js-draw';

// Use the Material Icon pack.
import { MaterialIconProvider } from '@js-draw/material-icons';

// Apply js-draw CSS
import 'js-draw/styles';
// If your bundler doesn't support the above, try
// import 'js-draw/bundledStyles';

(async () => {
	// All settings are optional! Try commenting them out.
	const settings: EditorSettings = {
		// Use a non-default set of icons
		iconProvider: new MaterialIconProvider(),

		// Only capture mouse wheel events if the editor has focus. This is useful
		// when the editor is part of a larger, scrolling page.
		wheelEventsEnabled: 'only-if-focused',
	};

	// Create the editor!
	const editor = new Editor(document.body, settings);

	// Adds the defualt toolbar
	const toolbar = editor.addToolbar();

	// Increases the minimum height of the editor
	editor.getRootElement().style.height = '600px';

	// Loads from SVG data
	await editor.loadFromSVG(`
		<svg
			viewBox="0 0 500 500"
			width="500" height="500"
			version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg"
		>
			<path
				d="M500,500L500,0L0,0L0,500L500,500"
				fill="#aaa"
				class="js-draw-image-background"
			/>
			<text
				style="transform: matrix(1, 0, 0, 1, 57, 192); font-family: serif; font-size: 32px; fill: #111;"
			>Testing...</text>
		</svg>
	`);

	// Adding tags to a toolbar button allows different styles to be applied.
	// Also see addActionButton.
	toolbar.addSaveButton(() => {
		const saveData = editor.toSVG().outerHTML;

		// Do something with saveData
		alert('Saved data!\n\n' + saveData);
	});

	toolbar.addExitButton(() => {
		// Save/confirm exiting here?
		editor.remove();
	});
})();

From page: modules/js-draw.Vec2.html

import { Vec2 } from '@js-draw/math';

const v = Vec2.of(1, 2);
console.log('a Vec2:', v);
console.log('x component:', v.x);
console.log('z component:', v.z);

From page: functions/js-draw.Vec2.of.html

import { Vec2 } from '@js-draw/math';
const v = Vec2.of(3, 4); // x=3, y=4.

From page: functions/js-draw.Vec2.ofXY.html

import { Vec2 } from '@js-draw/math';
const v1 = Vec2.ofXY({ x: 3, y: 4.5 });
const v2 = Vec2.ofXY({ x: -123.4, y: 1 });

From page: functions/js-draw.Vec3.of.html

import { Vec3 } from '@js-draw/math';
const v1 = Vec3.of(1, 2, 3);
console.log(v1.plus(Vec3.of(0, 100, 0)));

From page: classes/js-draw.AbstractToolbar.html

import { Editor } from 'js-draw';
const editor = new Editor(document.body);
const toolbar = editor.addToolbar();

function makeTrashIcon() {
  const container = document.createElement('div');
  container.textContent = '🗑️';
  return container;
}

toolbar.addActionButton({
  icon: makeTrashIcon(), // can be any Element not in the DOM
  label: 'Delete all',
}, () => {
  alert('to-do!');

From page: classes/js-draw.AbstractToolbar.html

import { Editor, makeDropdownToolbar } from 'js-draw';

const editor = new Editor(document.body);
const toolbar = makeDropdownToolbar(editor);

toolbar.addDefaults();
toolbar.addSaveButton(() => alert('save clicked!'));

From page: classes/js-draw.CanvasRenderer.html

import {Editor,CanvasRenderer} from 'js-draw';

// Create an editor and load initial data -- don't add to the body (hidden editor).
const editor = new Editor(document.createElement('div'));
await editor.loadFromSVG('<svg><path d="m0,0 l100,5 l-50,60 l30,20 z" fill="green"/></svg>');
---visible---
// Given some editor.
// Set up the canvas to be drawn onto.
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');

// Ensure that the canvas can fit the entire rendering
const viewport = editor.image.getImportExportViewport();
canvas.width = viewport.getScreenRectSize().x;
canvas.height = viewport.getScreenRectSize().y;

// Render editor.image onto the renderer
const renderer = new CanvasRenderer(ctx, viewport);
editor.image.render(renderer, viewport);

// Add the rendered canvas to the document.
document.body.appendChild(canvas);

From page: classes/js-draw.Color4.html

import { Color4 } from '@js-draw/math';

console.log('Red:', Color4.fromString('#f00'));
console.log('Also red:', Color4.ofRGB(1, 0, 0), Color4.red);
console.log('Mixing red and blue:', Color4.red.mix(Color4.blue, 0.5));
console.log('To string:', Color4.orange.toHexString());

From page: classes/js-draw.Color4.html

import { Color4 } from '@js-draw/math';
console.log(Color4.fromHex('#ff0'));

From page: classes/js-draw.Editor.html

import { Editor } from 'js-draw';

const editor = new Editor(document.body);

const toolbar = editor.addToolbar();
toolbar.addSaveButton(() => {
  const saveData = editor.toSVG().outerHTML;
  // Do something with saveData...
});

From page: classes/js-draw.Editor.html

import { Editor } from 'js-draw';

const container = document.body;

// Create an editor
const editor = new Editor(container, {
  // 2e-10 and 1e12 are the default values for minimum/maximum zoom.
  minZoom: 2e-10,
  maxZoom: 1e12,
});

// Add the default toolbar
const toolbar = editor.addToolbar();

const createCustomIcon = () => {
  // Create/return an icon here.
};

// Add a custom button
toolbar.addActionButton({
  label: 'Custom Button'
  icon: createCustomIcon(),
}, () => {
  // Do something here
});

From page: classes/js-draw.Editor.html

import { Editor, Stroke, Path, Color4, pathToRenderable } from 'js-draw';
const editor = new Editor(document.body);

// Create a path.
const stroke = new Stroke([
  pathToRenderable(Path.fromString('M0,0 L100,100 L300,30 z'), { fill: Color4.red }),
]);
const addComponentCommand = editor.image.addComponent(stroke);

// Add the stroke to the editor
editor.dispatch(addComponentCommand);

From page: classes/js-draw.Editor.html

import { Editor, EditorEventType, SerializableCommand } from 'js-draw';

// Create a minimal editor
const editor = new Editor(document.body);
editor.addToolbar();

// Create a place to show text output
const log = document.createElement('textarea');
document.body.appendChild(log);
log.style.width = '100%';
log.style.height = '200px';

// Listen for CommandDone events (there's also a CommandUndone)
editor.notifier.on(EditorEventType.CommandDone, event => {
  // Type narrowing for TypeScript -- event will always be of kind CommandDone,
  // but TypeScript doesn't know this.
  if (event.kind !== EditorEventType.CommandDone) return;

  log.value = `Command done ${event.command.description(editor, editor.localization)}\n`;

  if (event.command instanceof SerializableCommand) {
    log.value += `serializes to: ${JSON.stringify(event.command.serialize())}`;
  }
});

// Dispatch an initial command to trigger the event listener for the first time
editor.dispatch(editor.image.setAutoresizeEnabled(true));

From page: classes/js-draw.Editor.html

import {
	Editor, EditorImage, Stroke, Path, Color4,
} from 'js-draw';

const editor = new Editor(document.body);

const stroke = Stroke.fromFilled(
	Path.fromString('m0,0 l100,100 l0,-10 z'),
	Color4.red,
);
editor.dispatch(EditorImage.addComponent(stroke));

From page: classes/js-draw.Editor.html

import {Editor} from 'js-draw';
const editor = new Editor(document.body);

---visible---
await editor.loadFromSVG(`
  <svg viewBox="5 23 52 30" width="52" height="16" version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
    <text style="
      transform: matrix(0.181846, 0.1, 0, 0.181846, 11.4, 33.2);
      font-family: serif;
      font-size: 32px;
      fill: rgb(100, 140, 61);
    ">An SVG image!</text>
  </svg>
`);

From page: classes/js-draw.Editor.html

import { Editor, Color4, BackgroundComponentBackgroundType } from 'js-draw';
const editor = new Editor(document.body);
editor.dispatch(editor.setBackgroundStyle({
    color: Color4.orange,
    type: BackgroundComponentBackgroundType.Grid,
    autoresize: true,
}));

From page: classes/js-draw.Editor.html

import { Editor, ImageComponent, Mat33 } from 'js-draw';
const editor = new Editor(document.body);

//
// Adding an image
//
const myHtmlImage = new Image();
myHtmlImage.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAACCAYAAAB/qH1jAAAAKklEQVQIW2Ns022zZGRgfPnz8s8HDQwN/xgZgKBDu0PuL8tf5d8/fz8FAOiDD1H2gfpGAAAAAElFTkSuQmCC';

const rotated45Degrees = Mat33.zRotation(Math.PI / 4); // A 45 degree = pi/4 radian rotation
const scaledByFactorOf100 = Mat33.scaling2D(100);
// Scale **and** rotate
const transform = rotated45Degrees.rightMul(scaledByFactorOf100);

const imageComponent = await ImageComponent.fromImage(myHtmlImage, transform);
await editor.dispatch(editor.image.addComponent(imageComponent));

//
// Make a new image from the editor itself (with editor.toDataURL)
//
const toolbar = editor.addToolbar();
toolbar.addActionButton('From editor', async () => {
	const dataUrl = editor.toDataURL();
	const htmlImage = new Image();
	htmlImage.src = dataUrl;

	const imageComponent = await ImageComponent.fromImage(htmlImage, Mat33.identity);
	await editor.addAndCenterComponents([ imageComponent ]);
});

From page: classes/js-draw.EditorImage.html

import { Editor, RenderingStyle, Erase, Stroke, pathToRenderable } from 'js-draw';
import { Path, Color4, Point2, Vec2, Rect2 } from '@js-draw/math';
const editor = new Editor(document.body);


// //////////////// //
// Helper functions //
// //////////////// //

function addStroke(path: Path, style: RenderingStyle) {
	const stroke = new Stroke([
		pathToRenderable(path, style)
	]);

	// Create a command that adds the stroke to the image
	// (but don't apply it yet).
	const command = editor.image.addComponent(stroke);
	// Actually apply the command.
	editor.dispatch(command);
}

function addBoxAt(point: Point2, color: Color4) {
	// Create a 10x10 square at the given point:
	const box = new Rect2(point.x, point.y, 10, 10);

	addStroke(
		Path.fromRect(box),
		{ fill: color },
	);
}


function makeTrashIcon() {
	const container = document.createElement('div');
	container.textContent = '🗑️';
	return container;
}


// //////////////////// //
// End helper functions //
// //////////////////// //



// Add some components to the image:
addBoxAt(Vec2.of(0, 0), Color4.green);
addBoxAt(Vec2.of(20, 0), Color4.orange);
addBoxAt(Vec2.of(20, 20), Color4.blue);

// Get the components in a small rectangle near (0, 0)
const components = editor.image.getComponentsIntersecting(
	new Rect2(0, 0, 5, 5), // a 5x5 square with top left (0, 0)
);


// Add a button that removes the components
const toolbar = editor.addToolbar();
toolbar.addActionButton({
	icon: makeTrashIcon(),
	label: 'remove near (0,0)',
}, () => {
	const deleteCommand = new Erase(components);
	editor.dispatch(deleteCommand);
});

From page: classes/js-draw.EditorImage.html

import {Editor,CanvasRenderer} from 'js-draw';

// Create an editor and load initial data -- don't add to the body (hidden editor).
const editor = new Editor(document.createElement('div'));
await editor.loadFromSVG('<svg><path d="m0,0 l100,5 l-50,60 l30,20 z" fill="green"/></svg>');
---visible---
// Given some editor.
// Set up the canvas to be drawn onto.
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');

// Ensure that the canvas can fit the entire rendering
const viewport = editor.image.getImportExportViewport();
canvas.width = viewport.getScreenRectSize().x;
canvas.height = viewport.getScreenRectSize().y;

// Render editor.image onto the renderer
const renderer = new CanvasRenderer(ctx, viewport);
editor.image.render(renderer, viewport);

// Add the rendered canvas to the document.
document.body.appendChild(canvas);

From page: classes/js-draw.EditorImage.html

import { Editor } from 'js-draw';

const editor = new Editor(document.body);
const toolbar = editor.addToolbar();

// Add a save button to demonstrate what the output looks like
// (it should change size to fit whatever was drawn)
toolbar.addSaveButton(() => {
  document.body.replaceChildren(editor.toSVG({ sanitize: true }));
});

// Actually using setAutoresizeEnabled:
//
// To set autoresize without announcing for accessibility/making undoable
const addToHistory = false;
editor.dispatchNoAnnounce(editor.image.setAutoresizeEnabled(true), addToHistory);

// Add to undo history **and** announce for accessibility
//editor.dispatch(editor.image.setAutoresizeEnabled(true), true);

From page: classes/js-draw.EditorImage.html

import {
	Editor, EditorImage, Stroke, Path, Color4,
} from 'js-draw';

const editor = new Editor(document.body);

const stroke = Stroke.fromFilled(
	Path.fromString('m0,0 l100,100 l0,-10 z'),
	Color4.red,
);
editor.dispatch(EditorImage.addComponent(stroke));

From page: classes/js-draw.Erase.html

import { Editor, Erase, uniteCommands, Color4, Path, Stroke, Rect2, pathToRenderable } from 'js-draw';

const editor = new Editor(document.body);
editor.addToolbar();

// Add a large number of strokes
const commands = [];
for (let x = -20; x < 20; x++) {
  for (let y = 0; y < 60; y++) {
    const stroke = new Stroke([
      pathToRenderable(
        Path.fromString(`m${x * 5},${y * 5}l1,1`),
        { fill: Color4.transparent, stroke: {width: 2, color: Color4.ofRGB(x / 10, y / 10, 0.5)}} )
      ]);
    commands.push(editor.image.addElement(stroke));
  }
}
await editor.dispatch(uniteCommands(commands, 100));

---visible---
// Given some editor...

// Find all elements intersecting the rectangle with top left (-10,-30) and
// (width,height)=(50,100).
const elems = editor.image.getComponentsIntersecting(
	new Rect2(-10, -30, 50, 100)
);

// Create a command that erases [elems] when applied
const eraseElemsCmd = new Erase(elems);

// Apply the command (and make it undoable)
editor.dispatch(eraseElemsCmd);

From page: classes/js-draw.IconProvider.html

import * as jsdraw from 'js-draw';

class CustomIconProvider extends jsdraw.IconProvider {
    // Use '☺' instead of the default dropdown symbol.
    public override makeDropdownIcon() {
        const icon = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
        icon.innerHTML = `
            <text x='5' y='55' style='fill: var(--icon-color); font-size: 50pt;'>☺</text>
        `;
        icon.setAttribute('viewBox', '0 0 100 100');
        return icon;
    }
}

const icons = new CustomIconProvider();
const editor = new jsdraw.Editor(document.body, {
    // The icon pack to use is specified through the editor's initial
    // configuration object:
    iconProvider: icons,
});

// Add a toolbar that uses these icons
jsdraw.makeDropdownToolbar(editor).addDefaults();

From page: classes/js-draw.ImageComponent.html

import { Editor, ImageComponent, Mat33 } from 'js-draw';
const editor = new Editor(document.body);

//
// Adding an image
//
const myHtmlImage = new Image();
myHtmlImage.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAACCAYAAAB/qH1jAAAAKklEQVQIW2Ns022zZGRgfPnz8s8HDQwN/xgZgKBDu0PuL8tf5d8/fz8FAOiDD1H2gfpGAAAAAElFTkSuQmCC';

const rotated45Degrees = Mat33.zRotation(Math.PI / 4); // A 45 degree = pi/4 radian rotation
const scaledByFactorOf100 = Mat33.scaling2D(100);
// Scale **and** rotate
const transform = rotated45Degrees.rightMul(scaledByFactorOf100);

const imageComponent = await ImageComponent.fromImage(myHtmlImage, transform);
await editor.dispatch(editor.image.addComponent(imageComponent));

//
// Make a new image from the editor itself (with editor.toDataURL)
//
const toolbar = editor.addToolbar();
toolbar.addActionButton('From editor', async () => {
	const dataUrl = editor.toDataURL();
	const htmlImage = new Image();
	htmlImage.src = dataUrl;

	const imageComponent = await ImageComponent.fromImage(htmlImage, Mat33.identity);
	await editor.addAndCenterComponents([ imageComponent ]);
});

From page: classes/js-draw.InsertImageWidget.html

import { Editor, makeEdgeToolbar, InsertImageWidget } from 'js-draw';

const editor = new Editor(document.body);
const toolbar = makeEdgeToolbar(editor);

toolbar.addWidget(new InsertImageWidget(editor));

From page: classes/js-draw.LineSegment2.html

import {LineSegment2, Vec2} from '@js-draw/math';
const l = new LineSegment2(Vec2.of(1, 1), Vec2.of(2, 2));
console.log('length: ', l.length);
console.log('direction: ', l.direction);
console.log('bounding box: ', l.bbox);

From page: classes/js-draw.LineSegment2.html

import {LineSegment2, Vec2} from '@js-draw/math';
console.log(LineSegment2.ofSmallestContainingPoints([Vec2.of(1, 0), Vec2.of(0, 1)]));

From page: classes/js-draw.Mat33.html

import {Mat33, Vec2} from '@js-draw/math';

const moveLeftAndUp = Mat33.translation(Vec2.of(5, 6));
console.log(moveLeftAndUp);

From page: classes/js-draw.Mat33.html

---use-previous---
---visible---
console.log(moveLeftAndUp.transformVec2(Vec2.of(1, 1)));
console.log(moveLeftAndUp.transformVec2(Vec2.of(-1, 2)));

From page: classes/js-draw.Mat33.html

---use-previous---
---visible---
// Create a matrix by right multiplying.
const scaleThenRotate =
  // The resultant matrix first scales by a factor of two
  Mat33.scaling2D(2).rightMul(
    // ...then rotates by pi/2 radians = 90 degrees.
    Mat33.zRotation(Math.PI / 2)
  );
console.log(scaleThenRotate);

// Use scaleThenRotate to scale then rotate a vector.
console.log(scaleThenRotate.transformVec2(Vec2.unitX));

From page: classes/js-draw.Mat33.html

import {Mat33, Vec2} from '@js-draw/math';
console.log(Mat33.identity.rightMul(Mat33.identity));

// Create a matrix by right multiplying.
const scaleThenRotate =
  // The resultant matrix first scales by a factor of two
  Mat33.scaling2D(2).rightMul(
    // ...then rotates by pi/4 radians = 45 degrees.
    Mat33.zRotation(Math.PI / 4)
  );
console.log(scaleThenRotate);

// Use scaleThenRotate to scale then rotate a vector.
console.log(scaleThenRotate.transformVec2(Vec2.unitX));

From page: classes/js-draw.Mat33.html

import { Mat33 } from '@js-draw/math';
console.log(
  new Mat33(
    1, 2, 3,
    4, 5, 6,
    7, 8, 9,
  )
);

From page: classes/js-draw.Mat33.html

import { Mat33 } from '@js-draw/math';
console.log(Mat33.identity.toString());

From page: classes/js-draw.Mat33.html

import { Mat33, Vec2 } from '@js-draw/math';

const halfCircle = Math.PI; // PI radians = 180 degrees = 1/2 circle
const center = Vec2.of(1, 1); // The point (1,1)
const rotationMatrix = Mat33.zRotation(halfCircle, center);

console.log(
  'Rotating (0,0) 180deg about', center, 'results in',
  // Rotates (0,0)
  rotationMatrix.transformVec2(Vec2.zero),
);

From page: classes/js-draw.PanZoomTool.html

import { Editor, PanZoomTool, PanZoomMode } from 'js-draw';

const editor = new Editor(document.body);

// By default, there are multiple PanZoom tools that handle different events.
// This gets all PanZoomTools.
const panZoomToolList = editor.toolController.getMatchingTools(PanZoomTool);

// The first PanZoomTool is the highest priority -- by default,
// this tool is responsible for handling multi-finger touch gestures.
//
// Lower-priority PanZoomTools handle one-finger touch gestures and
// key-presses.
const panZoomTool = panZoomToolList[0];

// Lock rotation for multi-finger touch gestures.
panZoomTool.setModeEnabled(PanZoomMode.RotationLocked, true);

From page: classes/js-draw.Path.html

import {Path, Mat33, Vec2, LineSegment2} from '@js-draw/math';

// Creates a path from an SVG path string.
// In this case,
// 1. Move to (0,0)
// 2. Line to (100,0)
const path = Path.fromString('M0,0 L100,0');

// Logs the distance from (10,0) to the curve 1 unit
// away from path. This curve forms a stroke with the path at
// its center.
const strokeRadius = 1;
console.log(path.signedDistance(Vec2.of(10,0), strokeRadius));

// Log a version of the path that's scaled by a factor of 4.
console.log(path.transformedBy(Mat33.scaling2D(4)).toString());

// Log all intersections of a stroked version of the path with
// a vertical line segment.
// (Try removing the `strokeRadius` parameter).
const segment = new LineSegment2(Vec2.of(5, -100), Vec2.of(5, 100));
console.log(path.intersection(segment, strokeRadius).map(i => i.point));

From page: classes/js-draw.Path.html

import {Path} from '@js-draw/math';
console.log(Path.fromString('m0,0l1,1').reversed()); // -> M1,1 L0,0

From page: classes/js-draw.Path.html

import {Path, Vec2} from '@js-draw/math';
console.log(Path.fromString('m0,0 L100,0').signedDistance(Vec2.zero, 1));

From page: classes/js-draw.Path.html

import { Path } from '@js-draw/math';

const path = Path.fromString('m0,0l100,100');
console.log(path.toString(true)); // true: Prefer relative to absolute path commands

From page: classes/js-draw.PenTool.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: classes/js-draw.QuadraticBezier.html

import { QuadraticBezier, Vec2 } from '@js-draw/math';

const startPoint = Vec2.of(4, 3);
const controlPoint = Vec2.of(1, 1);
const endPoint = Vec2.of(1, 3);

const curve = new QuadraticBezier(
  startPoint,
  controlPoint,
  endPoint,
);

console.log('Curve:', curve);

From page: classes/js-draw.Rect2.html

import { Rect2, Vec2 } from '@js-draw/math';

const rect = Rect2.fromCorners(
  Vec2.of(0, 0),
  Vec2.of(10, 10),
);
console.log('area', rect.area);
console.log('topLeft', rect.topLeft);

From page: classes/js-draw.Stroke.html

import {
	Editor, EditorImage, Stroke, Path, Color4,
} from 'js-draw';

const editor = new Editor(document.body);

const stroke = Stroke.fromFilled(
	Path.fromString('m0,0 l100,100 l0,-10 z'),
	Color4.red,
);
editor.dispatch(EditorImage.addComponent(stroke));

From page: classes/js-draw.Stroke.html

import { Editor, Stroke, Color4 } from 'js-draw';
const editor = new Editor(document.body);
---visible---
const stroke = Stroke.fromStroked('m0,0 l10,10', { width: 10, color: Color4.red });
editor.dispatch(editor.image.addComponent(stroke));

From page: classes/js-draw.TextComponent.html

import { Editor, TextComponent, Mat33, Vec2, Color4, TextRenderingStyle } from 'js-draw';
const editor = new Editor(document.body);
editor.dispatch(editor.setBackgroundStyle({ color: Color4.black, autoresize: true ));
---visible---
/// Adding a simple TextComponent
///------------------------------

const positioning1 = Mat33.translation(Vec2.of(10, 10));
const style: TextRenderingStyle = {
    fontFamily: 'sans', size: 12, renderingStyle: { fill: Color4.green },
};

editor.dispatch(
    editor.image.addComponent(new TextComponent(['Hello, world'], positioning1, style)),
);


/// Adding nested TextComponents
///-----------------------------

// Add another TextComponent that contains text and a TextComponent. Observe that '[Test]'
// is placed directly after 'Test'.
const positioning2 = Mat33.translation(Vec2.of(10, 50));
editor.dispatch(
    editor.image.addComponent(
        new TextComponent([ new TextComponent(['Test'], positioning1, style), '[Test]' ], positioning2, style)
    ),
);

From page: classes/js-draw.Viewport.html

import { Editor, Viewport, Mat33, Vec2 } from 'js-draw';
const editor = new Editor(document.body);
const moveRight = Mat33.translation(Vec2.unitX.times(500));
// Move the **canvas** right by 500 units:
Viewport.transformBy(moveRight).apply(editor);

From page: interfaces/js-draw.EditorSettings.html

import { EditorSettings, Editor, KeyBinding, makeEdgeToolbar } from 'js-draw';
import { MaterialIconProvider } from '@js-draw/material-icons';

// All settings are optional! Try commenting them out.
const settings: EditorSettings = {
	// Use a non-default set of icons
	iconProvider: new MaterialIconProvider(),

	// Only capture mouse wheel events if the editor has focus. This is useful
	// when the editor is part of a larger, scrolling page.
	wheelEventsEnabled: 'only-if-focused',

	// The default minimum zoom is 2e-10...
	minZoom: 2e-10,

	// and the maximum default zoom is 1e12
	maxZoom: 1e12,

	// Override some keyboard shortcuts!
	keyboardShortcutOverrides: {
		// The ID for the save action
		'jsdraw.toolbar.SaveActionWidget.save': [
			// "Meta" = the command key on MacOS
			KeyBinding.fromString('ctrlOrMeta+s'),

			// Also map ctrl+M to save!
			KeyBinding.fromString('ctrl+m'),
		],
	},
};

// Create the editor!
const editor = new Editor(document.body, settings);

// Selects a specific toolbar type. See also makeDropdownToolbar
const toolbar = makeEdgeToolbar(editor);
toolbar.addDefaults();

// Add the action button that is triggered by the save keyboard shortcuts above.
toolbar.addSaveButton(() => {
	const saveData = editor.toSVG().outerHTML;

	// Do something with saveData
	alert('Saved data:\n\n' + saveData);
});

From page: interfaces/js-draw.EditorSettings.html

import { Editor, makePolylineBuilder } from 'js-draw';

const editor = new Editor(document.body, {
	pens: {
		additionalPenTypes: [{
			name: 'Polyline (For debugging)',
			id: 'custom-polyline',
			factory: makePolylineBuilder,

			// The pen doesn't create fixed shapes (e.g. squares, rectangles, etc)
			// and so should go under the "pens" section.
			isShapeBuilder: false,
		}],
	},
});
editor.addToolbar();

From page: interfaces/js-draw.EditorSettings.html

import {Editor} from 'js-draw';
const editor = new Editor(document.body, {
  // Only allow selecting the polyline pen from the toolbar.
  pens: { filterPenTypes: p => p.id === 'polyline-pen' },
});
editor.addToolbar();

From page: interfaces/js-draw.Vec3-1.html

import { Vec3 } from '@js-draw/math';

console.log('Vector addition:', Vec3.of(1, 2, 3).plus(Vec3.of(0, 1, 0)));
console.log('Scalar multiplication:', Vec3.of(1, 2, 3).times(2));
console.log('Cross products:', Vec3.unitX.cross(Vec3.unitY));
console.log('Magnitude:', Vec3.of(1, 2, 3).length(), 'or', Vec3.of(1, 2, 3).magnitude());
console.log('Square Magnitude:', Vec3.of(1, 2, 3).magnitudeSquared());
console.log('As an array:', Vec3.unitZ.asArray());

From page: interfaces/js-draw.Vec3-1.html

import { Vec2 } from '@js-draw/math';
console.log(Vec2.of(-1, -0).angle()); // atan2(-0, -1)
console.log(Vec2.of(-1, 0).angle());  // atan2(0, -1)

From page: interfaces/js-draw.Vec3-1.html

import { Vec3 } from '@js-draw/math';
console.log(Vec3.of(1, 2, 3).map(val => val + 1)); // → Vec(2, 3, 4)

From page: interfaces/js-draw.Vec3-1.html

import { Vec3 } from '@js-draw/math';
console.log(Vec3.of(-1, -10, 8).maximumEntryMagnitude()); // -> 10

From page: functions/js-draw.adjustEditorThemeForContrast.html

import { Editor, adjustEditorThemeForContrast } from 'js-draw';

const editor = new Editor(document.body);
editor.addToolbar();

const css = `
  :root .imageEditorContainer {
    --background-color-1: #ffff77;
    --foreground-color-1: #fff;
    --background-color-2: #ffff99;
    --foreground-color-2: #ffff88;
    --background-color-3: #ddffff;
    --foreground-color-3: #eeffff;
    --selection-background-color: #9f7;
    --selection-foreground-color: #98f;
  }

  @media screen and (prefers-color-scheme: dark) {
    :root .imageEditorContainer {
      --background-color-1: black;
    }
  }
`;
editor.addStyleSheet(css);

adjustEditorThemeForContrast(editor);

// Because adjustEditorThemeForContrast overrides the current theme, it should be called again
// to allow the editor to switch between light/dark themes.
window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
  adjustEditorThemeForContrast(editor);
});

window.matchMedia('print').addEventListener('change', () => {
  adjustEditorThemeForContrast(editor);
});

From page: functions/js-draw.makeArrowBuilder.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: functions/js-draw.makeDropdownToolbar.html

import { makeDropdownToolbar, Editor } from 'js-draw';

const editor = new Editor(document.body);
const toolbar = makeDropdownToolbar(editor);
toolbar.addDefaults();

toolbar.addExitButton(editor => {
  // TODO
});

toolbar.addSaveButton(editor => {
  // TODO
});

From page: functions/js-draw.makeEdgeToolbar.html

import { makeEdgeToolbar, Editor } from 'js-draw';

const editor = new Editor(document.body);
const toolbar = makeEdgeToolbar(editor);
toolbar.addDefaults();

toolbar.addSaveButton(editor => {
  // TODO
});

toolbar.addExitButton(editor => {
  // TODO
});

From page: functions/js-draw.makeFilledRectangleBuilder.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: functions/js-draw.makeFreehandLineBuilder.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: functions/js-draw.makeLineBuilder.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: functions/js-draw.makeOutlinedCircleBuilder.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: functions/js-draw.makeOutlinedRectangleBuilder.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: functions/js-draw.makePolylineBuilder.html

import {
	Editor,
	PenTool,
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
	InputEvtType,
	sendPenEvent,
} from 'js-draw';
import { Color4, Vec2 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Different pen types that build strokes in different ways. This is a list of some of the
// default ones:
const strokeBuilders = [
	makePolylineBuilder,
	makeOutlinedCircleBuilder,
	makeOutlinedRectangleBuilder,
	makeArrowBuilder,
	makePressureSensitiveFreehandLineBuilder,
	makeFreehandLineBuilder,
];

// Get the first pen
const pen = editor.toolController.getMatchingTools(PenTool)[0];
// If using a different pen (e.g. the second), be sure to select it!
// pen.setEnabled(true);

// Draw something with each style
for (const factory of strokeBuilders) {
	// Make the pen use a certain style.
	pen.setStrokeFactory(factory);
	// What happens if the following line is uncommented?
	// pen.setStrokeFactory(makeArrowBuilder);

	// Select a random pen color
	const penColor = Color4.ofRGB(Math.random(), Math.random(), Math.random());
	pen.setColor(penColor);

	// Draw something!
	const imageSize = editor.getImportExportRect().size;
	const startPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	const endPos = Vec2.of(Math.random() * imageSize.x, Math.random() * imageSize.y);
	sendPenEvent(editor, InputEvtType.PointerDownEvt, startPos);
	sendPenEvent(editor, InputEvtType.PointerMoveEvt, startPos.lerp(endPos, 0.5));
	sendPenEvent(editor, InputEvtType.PointerUpEvt, endPos);
}

From page: functions/js-draw.toRoundedString.html

import { toRoundedString } from '@js-draw/math';

console.log('Rounded: ', toRoundedString(1.000000011));

From page: functions/js-draw.uniteCommands.html

import { Editor, pathToRenderable, Stroke, uniteCommands } from 'js-draw';
import { Path, Color4 } from '@js-draw/math';

const editor = new Editor(document.body);
editor.addToolbar();

// Create strokes!
const strokes = [];
for (let i = 0; i < 10; i++) {
  const renderablePath = pathToRenderable(
    Path.fromString(`M0,${i * 10} L100,100 L300,30 z`),
    { fill: Color4.transparent, stroke: { color: Color4.red, width: 1, } }
  );
  strokes.push(new Stroke([ renderablePath ]));
}

// Convert to commands
const addStrokesCommands = strokes.map(stroke => editor.image.addElement(stroke));

// Apply all as a single undoable command (try applying each in a loop instead!)
await editor.dispatch(uniteCommands(addStrokesCommands));

// The second parameter to uniteCommands is for very large numbers of commands, when
// applying them shouldn't be done all at once (which would block the UI).

// The second parameter to uniteCommands is for very large numbers of commands, when
// applying them shouldn't be done all at once (which would block the UI).

From page: modules/_js-draw_material-icons.html

import { Editor, makeEdgeToolbar } from 'js-draw';
import { MaterialIconProvider } from '@js-draw/material-icons';

// Apply js-draw CSS
import 'js-draw/styles';

const editor = new Editor(document.body, {
  iconProvider: new MaterialIconProvider(),
});

// Ensure that there is enough room for the toolbar
editor.getRootElement().style.minHeight = '500px';

// Add a toolbar
const toolbar = makeEdgeToolbar(editor);

// ...with the default elements
toolbar.addDefaults();

From page: functions/_js-draw_material-icons.makeMaterialIconProviderClass.html

import * as jsdraw from 'js-draw';
import { makeMaterialIconProviderClass } from '@js-draw/material-icons';
const MaterialIconProvider = makeMaterialIconProviderClass(jsdraw);

(new jsdraw.Editor(
    document.body, { iconProvider: new MaterialIconProvider() },
)).addToolbar();

From page: modules/_js-draw_math.html

import { Vec2, Mat33, Rect2 } from '@js-draw/math';

// Example: Rotate a vector 90 degrees about the z-axis
const rotate90Degrees = Mat33.zRotation(Math.PI/2); // π/2 radians = 90 deg
const moveUp = Mat33.translation(Vec2.of(1, 0));
const moveUpThenRotate = rotate90Degrees.rightMul(moveUp);
console.log(moveUpThenRotate.transformVec2(Vec2.of(1, 2)));

// Example: Bounding box of some points
console.log(Rect2.bboxOf([
  Vec2.of(1, 2), Vec2.of(3, 4), Vec2.of(-100, 1000),
]));

From page: modules/_js-draw_math.Vec2.html

import { Vec2 } from '@js-draw/math';

const v = Vec2.of(1, 2);
console.log('a Vec2:', v);
console.log('x component:', v.x);
console.log('z component:', v.z);

From page: functions/_js-draw_math.Vec2.of.html

import { Vec2 } from '@js-draw/math';
const v = Vec2.of(3, 4); // x=3, y=4.

From page: functions/_js-draw_math.Vec2.ofXY.html

import { Vec2 } from '@js-draw/math';
const v1 = Vec2.ofXY({ x: 3, y: 4.5 });
const v2 = Vec2.ofXY({ x: -123.4, y: 1 });

From page: functions/_js-draw_math.Vec3.of.html

import { Vec3 } from '@js-draw/math';
const v1 = Vec3.of(1, 2, 3);
console.log(v1.plus(Vec3.of(0, 100, 0)));

From page: classes/_js-draw_math.Color4.html

import { Color4 } from '@js-draw/math';

console.log('Red:', Color4.fromString('#f00'));
console.log('Also red:', Color4.ofRGB(1, 0, 0), Color4.red);
console.log('Mixing red and blue:', Color4.red.mix(Color4.blue, 0.5));
console.log('To string:', Color4.orange.toHexString());

From page: classes/_js-draw_math.Color4.html

import { Color4 } from '@js-draw/math';
console.log(Color4.fromHex('#ff0'));

From page: classes/_js-draw_math.LineSegment2.html

import {LineSegment2, Vec2} from '@js-draw/math';
const l = new LineSegment2(Vec2.of(1, 1), Vec2.of(2, 2));
console.log('length: ', l.length);
console.log('direction: ', l.direction);
console.log('bounding box: ', l.bbox);

From page: classes/_js-draw_math.LineSegment2.html

import {LineSegment2, Vec2} from '@js-draw/math';
console.log(LineSegment2.ofSmallestContainingPoints([Vec2.of(1, 0), Vec2.of(0, 1)]));

From page: classes/_js-draw_math.Mat33.html

import {Mat33, Vec2} from '@js-draw/math';

const moveLeftAndUp = Mat33.translation(Vec2.of(5, 6));
console.log(moveLeftAndUp);

From page: classes/_js-draw_math.Mat33.html

---use-previous---
---visible---
console.log(moveLeftAndUp.transformVec2(Vec2.of(1, 1)));
console.log(moveLeftAndUp.transformVec2(Vec2.of(-1, 2)));

From page: classes/_js-draw_math.Mat33.html

---use-previous---
---visible---
// Create a matrix by right multiplying.
const scaleThenRotate =
  // The resultant matrix first scales by a factor of two
  Mat33.scaling2D(2).rightMul(
    // ...then rotates by pi/2 radians = 90 degrees.
    Mat33.zRotation(Math.PI / 2)
  );
console.log(scaleThenRotate);

// Use scaleThenRotate to scale then rotate a vector.
console.log(scaleThenRotate.transformVec2(Vec2.unitX));

From page: classes/_js-draw_math.Mat33.html

import {Mat33, Vec2} from '@js-draw/math';
console.log(Mat33.identity.rightMul(Mat33.identity));

// Create a matrix by right multiplying.
const scaleThenRotate =
  // The resultant matrix first scales by a factor of two
  Mat33.scaling2D(2).rightMul(
    // ...then rotates by pi/4 radians = 45 degrees.
    Mat33.zRotation(Math.PI / 4)
  );
console.log(scaleThenRotate);

// Use scaleThenRotate to scale then rotate a vector.
console.log(scaleThenRotate.transformVec2(Vec2.unitX));

From page: classes/_js-draw_math.Mat33.html

import { Mat33 } from '@js-draw/math';
console.log(
  new Mat33(
    1, 2, 3,
    4, 5, 6,
    7, 8, 9,
  )
);

From page: classes/_js-draw_math.Mat33.html

import { Mat33 } from '@js-draw/math';
console.log(Mat33.identity.toString());

From page: classes/_js-draw_math.Mat33.html

import { Mat33, Vec2 } from '@js-draw/math';

const halfCircle = Math.PI; // PI radians = 180 degrees = 1/2 circle
const center = Vec2.of(1, 1); // The point (1,1)
const rotationMatrix = Mat33.zRotation(halfCircle, center);

console.log(
  'Rotating (0,0) 180deg about', center, 'results in',
  // Rotates (0,0)
  rotationMatrix.transformVec2(Vec2.zero),
);

From page: classes/_js-draw_math.Path.html

import {Path, Mat33, Vec2, LineSegment2} from '@js-draw/math';

// Creates a path from an SVG path string.
// In this case,
// 1. Move to (0,0)
// 2. Line to (100,0)
const path = Path.fromString('M0,0 L100,0');

// Logs the distance from (10,0) to the curve 1 unit
// away from path. This curve forms a stroke with the path at
// its center.
const strokeRadius = 1;
console.log(path.signedDistance(Vec2.of(10,0), strokeRadius));

// Log a version of the path that's scaled by a factor of 4.
console.log(path.transformedBy(Mat33.scaling2D(4)).toString());

// Log all intersections of a stroked version of the path with
// a vertical line segment.
// (Try removing the `strokeRadius` parameter).
const segment = new LineSegment2(Vec2.of(5, -100), Vec2.of(5, 100));
console.log(path.intersection(segment, strokeRadius).map(i => i.point));

From page: classes/_js-draw_math.Path.html

import {Path} from '@js-draw/math';
console.log(Path.fromString('m0,0l1,1').reversed()); // -> M1,1 L0,0

From page: classes/_js-draw_math.Path.html

import {Path, Vec2} from '@js-draw/math';
console.log(Path.fromString('m0,0 L100,0').signedDistance(Vec2.zero, 1));

From page: classes/_js-draw_math.Path.html

import { Path } from '@js-draw/math';

const path = Path.fromString('m0,0l100,100');
console.log(path.toString(true)); // true: Prefer relative to absolute path commands

From page: classes/_js-draw_math.QuadraticBezier.html

import { QuadraticBezier, Vec2 } from '@js-draw/math';

const startPoint = Vec2.of(4, 3);
const controlPoint = Vec2.of(1, 1);
const endPoint = Vec2.of(1, 3);

const curve = new QuadraticBezier(
  startPoint,
  controlPoint,
  endPoint,
);

console.log('Curve:', curve);

From page: classes/_js-draw_math.Rect2.html

import { Rect2, Vec2 } from '@js-draw/math';

const rect = Rect2.fromCorners(
  Vec2.of(0, 0),
  Vec2.of(10, 10),
);
console.log('area', rect.area);
console.log('topLeft', rect.topLeft);

From page: interfaces/_js-draw_math.Vec3-1.html

import { Vec3 } from '@js-draw/math';

console.log('Vector addition:', Vec3.of(1, 2, 3).plus(Vec3.of(0, 1, 0)));
console.log('Scalar multiplication:', Vec3.of(1, 2, 3).times(2));
console.log('Cross products:', Vec3.unitX.cross(Vec3.unitY));
console.log('Magnitude:', Vec3.of(1, 2, 3).length(), 'or', Vec3.of(1, 2, 3).magnitude());
console.log('Square Magnitude:', Vec3.of(1, 2, 3).magnitudeSquared());
console.log('As an array:', Vec3.unitZ.asArray());

From page: interfaces/_js-draw_math.Vec3-1.html

import { Vec2 } from '@js-draw/math';
console.log(Vec2.of(-1, -0).angle()); // atan2(-0, -1)
console.log(Vec2.of(-1, 0).angle());  // atan2(0, -1)

From page: interfaces/_js-draw_math.Vec3-1.html

import { Vec3 } from '@js-draw/math';
console.log(Vec3.of(1, 2, 3).map(val => val + 1)); // → Vec(2, 3, 4)

From page: interfaces/_js-draw_math.Vec3-1.html

import { Vec3 } from '@js-draw/math';
console.log(Vec3.of(-1, -10, 8).maximumEntryMagnitude()); // -> 10

From page: functions/_js-draw_math.toRoundedString.html

import { toRoundedString } from '@js-draw/math';

console.log('Rounded: ', toRoundedString(1.000000011));