434 lines
13 KiB
TypeScript
434 lines
13 KiB
TypeScript
import { ExcalidrawElement, ExcalidrawTextElement } from "../element/types";
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import { isTextElement } from "../element/typeChecks";
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import {
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getDiamondPoints,
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getArrowPoints,
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getElementAbsoluteCoords,
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} from "../element/bounds";
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import { RoughCanvas } from "roughjs/bin/canvas";
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import { Drawable } from "roughjs/bin/core";
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import { RoughSVG } from "roughjs/bin/svg";
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import { RoughGenerator } from "roughjs/bin/generator";
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import { SceneState } from "../scene/types";
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import { SVG_NS, distance } from "../utils";
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import rough from "roughjs/bin/rough";
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const CANVAS_PADDING = 20;
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export interface ExcalidrawElementWithCanvas {
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element: ExcalidrawElement | ExcalidrawTextElement;
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canvas: HTMLCanvasElement;
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canvasZoom: number;
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canvasOffsetX: number;
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canvasOffsetY: number;
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}
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function generateElementCanvas(
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element: ExcalidrawElement,
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zoom: number,
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): ExcalidrawElementWithCanvas {
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const canvas = document.createElement("canvas");
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const context = canvas.getContext("2d")!;
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const isLinear = /\b(arrow|line)\b/.test(element.type);
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let canvasOffsetX = 0;
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let canvasOffsetY = 0;
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if (isLinear) {
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const [x1, y1, x2, y2] = getElementAbsoluteCoords(element);
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canvas.width =
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distance(x1, x2) * window.devicePixelRatio * zoom + CANVAS_PADDING * 2;
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canvas.height =
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distance(y1, y2) * window.devicePixelRatio * zoom + CANVAS_PADDING * 2;
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canvasOffsetX =
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element.x > x1
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? Math.floor(distance(element.x, x1)) * window.devicePixelRatio
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: 0;
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canvasOffsetY =
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element.y > y1
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? Math.floor(distance(element.y, y1)) * window.devicePixelRatio
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: 0;
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context.translate(canvasOffsetX * zoom, canvasOffsetY * zoom);
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} else {
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canvas.width =
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element.width * window.devicePixelRatio * zoom + CANVAS_PADDING * 2;
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canvas.height =
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element.height * window.devicePixelRatio * zoom + CANVAS_PADDING * 2;
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}
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context.translate(CANVAS_PADDING, CANVAS_PADDING);
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context.scale(window.devicePixelRatio * zoom, window.devicePixelRatio * zoom);
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const rc = rough.canvas(canvas);
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drawElementOnCanvas(element, rc, context);
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context.translate(-CANVAS_PADDING, -CANVAS_PADDING);
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context.scale(
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1 / (window.devicePixelRatio * zoom),
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1 / (window.devicePixelRatio * zoom),
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);
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return { element, canvas, canvasZoom: zoom, canvasOffsetX, canvasOffsetY };
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}
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function drawElementOnCanvas(
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element: ExcalidrawElement,
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rc: RoughCanvas,
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context: CanvasRenderingContext2D,
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) {
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context.globalAlpha = element.opacity / 100;
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switch (element.type) {
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case "rectangle":
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case "diamond":
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case "ellipse": {
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rc.draw(getShapeForElement(element) as Drawable);
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break;
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}
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case "arrow":
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case "line": {
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(getShapeForElement(element) as Drawable[]).forEach((shape) =>
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rc.draw(shape),
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);
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break;
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}
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default: {
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if (isTextElement(element)) {
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const font = context.font;
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context.font = element.font;
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const fillStyle = context.fillStyle;
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context.fillStyle = element.strokeColor;
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// Canvas does not support multiline text by default
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const lines = element.text.replace(/\r\n?/g, "\n").split("\n");
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const lineHeight = element.height / lines.length;
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const offset = element.height - element.baseline;
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for (let i = 0; i < lines.length; i++) {
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context.fillText(lines[i], 0, (i + 1) * lineHeight - offset);
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}
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context.fillStyle = fillStyle;
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context.font = font;
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} else {
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throw new Error(`Unimplemented type ${element.type}`);
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}
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}
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}
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context.globalAlpha = 1;
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}
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const elementWithCanvasCache = new WeakMap<
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ExcalidrawElement,
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ExcalidrawElementWithCanvas
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>();
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const shapeCache = new WeakMap<
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ExcalidrawElement,
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Drawable | Drawable[] | null
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>();
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export function getShapeForElement(element: ExcalidrawElement) {
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return shapeCache.get(element);
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}
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export function invalidateShapeForElement(element: ExcalidrawElement) {
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shapeCache.delete(element);
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}
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function generateElement(
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element: ExcalidrawElement,
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generator: RoughGenerator,
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sceneState?: SceneState,
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) {
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let shape = shapeCache.get(element) || null;
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if (!shape) {
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elementWithCanvasCache.delete(element);
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switch (element.type) {
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case "rectangle":
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shape = generator.rectangle(0, 0, element.width, element.height, {
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stroke: element.strokeColor,
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fill:
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element.backgroundColor === "transparent"
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? undefined
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: element.backgroundColor,
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fillStyle: element.fillStyle,
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strokeWidth: element.strokeWidth,
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roughness: element.roughness,
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seed: element.seed,
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});
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break;
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case "diamond": {
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const [
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topX,
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topY,
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rightX,
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rightY,
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bottomX,
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bottomY,
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leftX,
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leftY,
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] = getDiamondPoints(element);
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shape = generator.polygon(
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[
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[topX, topY],
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[rightX, rightY],
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[bottomX, bottomY],
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[leftX, leftY],
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],
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{
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stroke: element.strokeColor,
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fill:
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element.backgroundColor === "transparent"
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? undefined
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: element.backgroundColor,
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fillStyle: element.fillStyle,
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strokeWidth: element.strokeWidth,
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roughness: element.roughness,
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seed: element.seed,
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},
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);
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break;
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}
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case "ellipse":
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shape = generator.ellipse(
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element.width / 2,
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element.height / 2,
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element.width,
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element.height,
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{
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stroke: element.strokeColor,
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fill:
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element.backgroundColor === "transparent"
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? undefined
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: element.backgroundColor,
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fillStyle: element.fillStyle,
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strokeWidth: element.strokeWidth,
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roughness: element.roughness,
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seed: element.seed,
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curveFitting: 1,
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},
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);
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break;
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case "line":
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case "arrow": {
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const options = {
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stroke: element.strokeColor,
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strokeWidth: element.strokeWidth,
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roughness: element.roughness,
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seed: element.seed,
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};
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// points array can be empty in the beginning, so it is important to add
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// initial position to it
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const points = element.points.length ? element.points : [[0, 0]];
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// curve is always the first element
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// this simplifies finding the curve for an element
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shape = [generator.curve(points as [number, number][], options)];
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// add lines only in arrow
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if (element.type === "arrow") {
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const [x2, y2, x3, y3, x4, y4] = getArrowPoints(element, shape);
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shape.push(
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...[
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generator.line(x3, y3, x2, y2, options),
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generator.line(x4, y4, x2, y2, options),
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],
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);
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}
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break;
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}
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case "text": {
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// just to ensure we don't regenerate element.canvas on rerenders
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shape = [];
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break;
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}
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}
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shapeCache.set(element, shape);
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}
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const zoom = sceneState ? sceneState.zoom : 1;
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const prevElementWithCanvas = elementWithCanvasCache.get(element);
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const shouldRegenerateBecauseZoom =
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prevElementWithCanvas &&
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prevElementWithCanvas.canvasZoom !== zoom &&
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!sceneState?.shouldCacheIgnoreZoom;
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if (!prevElementWithCanvas || shouldRegenerateBecauseZoom) {
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const elementWithCanvas = generateElementCanvas(element, zoom);
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elementWithCanvasCache.set(element, elementWithCanvas);
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return elementWithCanvas;
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}
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return prevElementWithCanvas;
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}
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function drawElementFromCanvas(
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elementWithCanvas: ExcalidrawElementWithCanvas,
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rc: RoughCanvas,
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context: CanvasRenderingContext2D,
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sceneState: SceneState,
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) {
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context.scale(1 / window.devicePixelRatio, 1 / window.devicePixelRatio);
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context.translate(
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-CANVAS_PADDING / elementWithCanvas.canvasZoom,
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-CANVAS_PADDING / elementWithCanvas.canvasZoom,
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);
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context.drawImage(
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elementWithCanvas.canvas!,
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Math.floor(
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-elementWithCanvas.canvasOffsetX +
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(Math.floor(elementWithCanvas.element.x) + sceneState.scrollX) *
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window.devicePixelRatio,
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),
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Math.floor(
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-elementWithCanvas.canvasOffsetY +
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(Math.floor(elementWithCanvas.element.y) + sceneState.scrollY) *
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window.devicePixelRatio,
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),
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elementWithCanvas.canvas!.width / elementWithCanvas.canvasZoom,
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elementWithCanvas.canvas!.height / elementWithCanvas.canvasZoom,
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);
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context.translate(
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CANVAS_PADDING / elementWithCanvas.canvasZoom,
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CANVAS_PADDING / elementWithCanvas.canvasZoom,
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);
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context.scale(window.devicePixelRatio, window.devicePixelRatio);
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}
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export function renderElement(
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element: ExcalidrawElement,
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rc: RoughCanvas,
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context: CanvasRenderingContext2D,
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renderOptimizations: boolean,
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sceneState: SceneState,
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) {
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const generator = rc.generator;
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switch (element.type) {
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case "selection": {
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context.translate(
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element.x + sceneState.scrollX,
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element.y + sceneState.scrollY,
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);
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const fillStyle = context.fillStyle;
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context.fillStyle = "rgba(0, 0, 255, 0.10)";
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context.fillRect(0, 0, element.width, element.height);
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context.fillStyle = fillStyle;
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context.translate(
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-element.x - sceneState.scrollX,
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-element.y - sceneState.scrollY,
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);
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break;
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}
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case "rectangle":
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case "diamond":
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case "ellipse":
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case "line":
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case "arrow":
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case "text": {
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const elementWithCanvas = generateElement(element, generator, sceneState);
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if (renderOptimizations) {
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drawElementFromCanvas(elementWithCanvas, rc, context, sceneState);
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} else {
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const offsetX = Math.floor(element.x + sceneState.scrollX);
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const offsetY = Math.floor(element.y + sceneState.scrollY);
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context.translate(offsetX, offsetY);
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drawElementOnCanvas(element, rc, context);
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context.translate(-offsetX, -offsetY);
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}
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break;
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}
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default: {
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// @ts-ignore
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throw new Error(`Unimplemented type ${element.type}`);
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}
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}
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}
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export function renderElementToSvg(
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element: ExcalidrawElement,
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rsvg: RoughSVG,
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svgRoot: SVGElement,
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offsetX?: number,
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offsetY?: number,
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) {
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const generator = rsvg.generator;
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switch (element.type) {
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case "selection": {
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// Since this is used only during editing experience, which is canvas based,
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// this should not happen
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throw new Error("Selection rendering is not supported for SVG");
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}
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case "rectangle":
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case "diamond":
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case "ellipse": {
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generateElement(element, generator);
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const node = rsvg.draw(getShapeForElement(element) as Drawable);
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const opacity = element.opacity / 100;
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if (opacity !== 1) {
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node.setAttribute("stroke-opacity", `${opacity}`);
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node.setAttribute("fill-opacity", `${opacity}`);
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}
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node.setAttribute(
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"transform",
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`translate(${offsetX || 0} ${offsetY || 0})`,
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);
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svgRoot.appendChild(node);
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break;
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}
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case "line":
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case "arrow": {
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generateElement(element, generator);
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const group = svgRoot.ownerDocument!.createElementNS(SVG_NS, "g");
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const opacity = element.opacity / 100;
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(getShapeForElement(element) as Drawable[]).forEach((shape) => {
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const node = rsvg.draw(shape);
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if (opacity !== 1) {
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node.setAttribute("stroke-opacity", `${opacity}`);
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node.setAttribute("fill-opacity", `${opacity}`);
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}
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node.setAttribute(
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"transform",
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`translate(${offsetX || 0} ${offsetY || 0})`,
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);
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group.appendChild(node);
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});
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svgRoot.appendChild(group);
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break;
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}
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default: {
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if (isTextElement(element)) {
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const opacity = element.opacity / 100;
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const node = svgRoot.ownerDocument!.createElementNS(SVG_NS, "g");
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if (opacity !== 1) {
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node.setAttribute("stroke-opacity", `${opacity}`);
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node.setAttribute("fill-opacity", `${opacity}`);
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}
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node.setAttribute(
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"transform",
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`translate(${offsetX || 0} ${offsetY || 0})`,
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);
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const lines = element.text.replace(/\r\n?/g, "\n").split("\n");
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const lineHeight = element.height / lines.length;
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const offset = element.height - element.baseline;
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const fontSplit = element.font.split(" ").filter((d) => !!d.trim());
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let fontFamily = fontSplit[0];
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let fontSize = "20px";
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if (fontSplit.length > 1) {
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fontFamily = fontSplit[1];
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fontSize = fontSplit[0];
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}
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for (let i = 0; i < lines.length; i++) {
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const text = svgRoot.ownerDocument!.createElementNS(SVG_NS, "text");
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text.textContent = lines[i];
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text.setAttribute("x", "0");
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text.setAttribute("y", `${(i + 1) * lineHeight - offset}`);
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text.setAttribute("font-family", fontFamily);
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text.setAttribute("font-size", fontSize);
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text.setAttribute("fill", element.strokeColor);
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node.appendChild(text);
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}
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svgRoot.appendChild(node);
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} else {
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// @ts-ignore
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throw new Error(`Unimplemented type ${element.type}`);
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}
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}
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}
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}
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