1628 lines
50 KiB
TypeScript
1628 lines
50 KiB
TypeScript
import React from "react";
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import ReactDOM from "react-dom";
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import rough from "roughjs/bin/wrappers/rough";
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import { RoughCanvas } from "roughjs/bin/canvas";
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import { moveOneLeft, moveAllLeft, moveOneRight, moveAllRight } from "./zindex";
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import "./styles.scss";
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type ExcalidrawElement = ReturnType<typeof newElement>;
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type ExcalidrawTextElement = ExcalidrawElement & {
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type: "text";
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font: string;
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text: string;
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actualBoundingBoxAscent: number;
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};
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const LOCAL_STORAGE_KEY = "excalidraw";
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const LOCAL_STORAGE_KEY_STATE = "excalidraw-state";
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const elements = Array.of<ExcalidrawElement>();
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let skipHistory = false;
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const stateHistory: string[] = [];
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function generateHistoryCurrentEntry() {
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return JSON.stringify(
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elements.map(element => ({ ...element, isSelected: false }))
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);
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}
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function pushHistoryEntry(newEntry: string) {
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if (
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stateHistory.length > 0 &&
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stateHistory[stateHistory.length - 1] === newEntry
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) {
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// If the last entry is the same as this one, ignore it
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return;
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}
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stateHistory.push(newEntry);
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}
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function restoreHistoryEntry(entry: string) {
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const newElements = JSON.parse(entry);
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elements.splice(0, elements.length);
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newElements.forEach((newElement: ExcalidrawElement) => {
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generateDraw(newElement);
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elements.push(newElement);
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});
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// When restoring, we shouldn't add an history entry otherwise we'll be stuck with it and can't go back
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skipHistory = true;
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}
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// https://stackoverflow.com/questions/521295/seeding-the-random-number-generator-in-javascript/47593316#47593316
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const LCG = (seed: number) => () =>
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((2 ** 31 - 1) & (seed = Math.imul(48271, seed))) / 2 ** 31;
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function randomSeed() {
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return Math.floor(Math.random() * 2 ** 31);
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}
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// Unfortunately, roughjs doesn't support a seed attribute (https://github.com/pshihn/rough/issues/27).
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// We can achieve the same result by overriding the Math.random function with a
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// pseudo random generator that supports a random seed and swapping it back after.
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function withCustomMathRandom<T>(seed: number, cb: () => T): T {
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const random = Math.random;
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Math.random = LCG(seed);
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const result = cb();
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Math.random = random;
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return result;
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}
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// https://stackoverflow.com/a/6853926/232122
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function distanceBetweenPointAndSegment(
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x: number,
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y: number,
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x1: number,
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y1: number,
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x2: number,
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y2: number
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) {
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const A = x - x1;
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const B = y - y1;
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const C = x2 - x1;
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const D = y2 - y1;
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const dot = A * C + B * D;
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const lenSquare = C * C + D * D;
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let param = -1;
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if (lenSquare !== 0) {
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// in case of 0 length line
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param = dot / lenSquare;
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}
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let xx, yy;
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if (param < 0) {
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xx = x1;
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yy = y1;
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} else if (param > 1) {
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xx = x2;
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yy = y2;
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} else {
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xx = x1 + param * C;
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yy = y1 + param * D;
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}
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const dx = x - xx;
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const dy = y - yy;
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return Math.hypot(dx, dy);
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}
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function hitTest(element: ExcalidrawElement, x: number, y: number): boolean {
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// For shapes that are composed of lines, we only enable point-selection when the distance
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// of the click is less than x pixels of any of the lines that the shape is composed of
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const lineThreshold = 10;
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if (element.type === "ellipse") {
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// https://stackoverflow.com/a/46007540/232122
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const px = Math.abs(x - element.x - element.width / 2);
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const py = Math.abs(y - element.y - element.height / 2);
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let tx = 0.707;
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let ty = 0.707;
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const a = element.width / 2;
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const b = element.height / 2;
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[0, 1, 2, 3].forEach(x => {
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const xx = a * tx;
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const yy = b * ty;
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const ex = ((a * a - b * b) * tx ** 3) / a;
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const ey = ((b * b - a * a) * ty ** 3) / b;
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const rx = xx - ex;
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const ry = yy - ey;
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const qx = px - ex;
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const qy = py - ey;
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const r = Math.hypot(ry, rx);
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const q = Math.hypot(qy, qx);
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tx = Math.min(1, Math.max(0, ((qx * r) / q + ex) / a));
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ty = Math.min(1, Math.max(0, ((qy * r) / q + ey) / b));
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const t = Math.hypot(ty, tx);
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tx /= t;
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ty /= t;
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});
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return Math.hypot(a * tx - px, b * ty - py) < lineThreshold;
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} else if (element.type === "rectangle") {
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const x1 = getElementAbsoluteX1(element);
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const x2 = getElementAbsoluteX2(element);
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const y1 = getElementAbsoluteY1(element);
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const y2 = getElementAbsoluteY2(element);
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// (x1, y1) --A-- (x2, y1)
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// |D |B
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// (x1, y2) --C-- (x2, y2)
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return (
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distanceBetweenPointAndSegment(x, y, x1, y1, x2, y1) < lineThreshold || // A
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distanceBetweenPointAndSegment(x, y, x2, y1, x2, y2) < lineThreshold || // B
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distanceBetweenPointAndSegment(x, y, x2, y2, x1, y2) < lineThreshold || // C
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distanceBetweenPointAndSegment(x, y, x1, y2, x1, y1) < lineThreshold // D
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);
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} else if (element.type === "arrow") {
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let [x1, y1, x2, y2, x3, y3, x4, y4] = getArrowPoints(element);
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// The computation is done at the origin, we need to add a translation
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x -= element.x;
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y -= element.y;
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return (
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// \
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distanceBetweenPointAndSegment(x, y, x3, y3, x2, y2) < lineThreshold ||
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// -----
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distanceBetweenPointAndSegment(x, y, x1, y1, x2, y2) < lineThreshold ||
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// /
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distanceBetweenPointAndSegment(x, y, x4, y4, x2, y2) < lineThreshold
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);
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} else if (element.type === "text") {
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const x1 = getElementAbsoluteX1(element);
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const x2 = getElementAbsoluteX2(element);
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const y1 = getElementAbsoluteY1(element);
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const y2 = getElementAbsoluteY2(element);
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return x >= x1 && x <= x2 && y >= y1 && y <= y2;
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} else if (element.type === "selection") {
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console.warn("This should not happen, we need to investigate why it does.");
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return false;
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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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function resizeTest(
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element: ExcalidrawElement,
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x: number,
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y: number,
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sceneState: SceneState
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): string | false {
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if (element.type === "text" || element.type === "arrow") return false;
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const handlers = handlerRectangles(element, sceneState);
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const filter = Object.keys(handlers).filter(key => {
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const handler = handlers[key];
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return (
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x + sceneState.scrollX >= handler[0] &&
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x + sceneState.scrollX <= handler[0] + handler[2] &&
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y + sceneState.scrollY >= handler[1] &&
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y + sceneState.scrollY <= handler[1] + handler[3]
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);
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});
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if (filter.length > 0) {
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return filter[0];
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}
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return false;
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}
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function newElement(
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type: string,
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x: number,
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y: number,
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strokeColor: string,
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backgroundColor: string,
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width = 0,
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height = 0
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) {
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const element = {
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type: type,
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x: x,
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y: y,
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width: width,
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height: height,
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isSelected: false,
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strokeColor: strokeColor,
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backgroundColor: backgroundColor,
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seed: randomSeed(),
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draw(
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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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};
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return element;
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}
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type SceneState = {
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scrollX: number;
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scrollY: number;
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// null indicates transparent bg
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viewBackgroundColor: string | null;
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};
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const SCROLLBAR_WIDTH = 6;
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const SCROLLBAR_MARGIN = 4;
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const SCROLLBAR_COLOR = "rgba(0,0,0,0.3)";
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const CANVAS_WINDOW_OFFSET_LEFT = 250;
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const CANVAS_WINDOW_OFFSET_TOP = 0;
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function getScrollbars(
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canvasWidth: number,
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canvasHeight: number,
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scrollX: number,
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scrollY: number
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) {
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// horizontal scrollbar
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const sceneWidth = canvasWidth + Math.abs(scrollX);
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const scrollBarWidth = (canvasWidth * canvasWidth) / sceneWidth;
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const scrollBarX = scrollX > 0 ? 0 : canvasWidth - scrollBarWidth;
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const horizontalScrollBar = {
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x: scrollBarX + SCROLLBAR_MARGIN,
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y: canvasHeight - SCROLLBAR_WIDTH - SCROLLBAR_MARGIN,
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width: scrollBarWidth - SCROLLBAR_MARGIN * 2,
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height: SCROLLBAR_WIDTH
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};
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// vertical scrollbar
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const sceneHeight = canvasHeight + Math.abs(scrollY);
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const scrollBarHeight = (canvasHeight * canvasHeight) / sceneHeight;
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const scrollBarY = scrollY > 0 ? 0 : canvasHeight - scrollBarHeight;
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const verticalScrollBar = {
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x: canvasWidth - SCROLLBAR_WIDTH - SCROLLBAR_MARGIN,
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y: scrollBarY + SCROLLBAR_MARGIN,
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width: SCROLLBAR_WIDTH,
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height: scrollBarHeight - SCROLLBAR_WIDTH * 2
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};
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return {
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horizontal: horizontalScrollBar,
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vertical: verticalScrollBar
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};
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}
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function isOverScrollBars(
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x: number,
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y: number,
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canvasWidth: number,
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canvasHeight: number,
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scrollX: number,
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scrollY: number
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) {
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const scrollBars = getScrollbars(canvasWidth, canvasHeight, scrollX, scrollY);
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const [isOverHorizontalScrollBar, isOverVerticalScrollBar] = [
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scrollBars.horizontal,
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scrollBars.vertical
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].map(
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scrollBar =>
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scrollBar.x <= x &&
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x <= scrollBar.x + scrollBar.width &&
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scrollBar.y <= y &&
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y <= scrollBar.y + scrollBar.height
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);
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return {
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isOverHorizontalScrollBar,
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isOverVerticalScrollBar
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};
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}
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function handlerRectangles(element: ExcalidrawElement, sceneState: SceneState) {
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const elementX1 = element.x;
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const elementX2 = element.x + element.width;
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const elementY1 = element.y;
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const elementY2 = element.y + element.height;
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const margin = 4;
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const minimumSize = 40;
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const handlers: { [handler: string]: number[] } = {};
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const marginX = element.width < 0 ? 8 : -8;
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const marginY = element.height < 0 ? 8 : -8;
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if (Math.abs(elementX2 - elementX1) > minimumSize) {
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handlers["n"] = [
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elementX1 + (elementX2 - elementX1) / 2 + sceneState.scrollX - 4,
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elementY1 - margin + sceneState.scrollY + marginY,
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8,
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8
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];
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handlers["s"] = [
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elementX1 + (elementX2 - elementX1) / 2 + sceneState.scrollX - 4,
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elementY2 - margin + sceneState.scrollY - marginY,
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8,
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8
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];
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}
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if (Math.abs(elementY2 - elementY1) > minimumSize) {
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handlers["w"] = [
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elementX1 - margin + sceneState.scrollX + marginX,
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elementY1 + (elementY2 - elementY1) / 2 + sceneState.scrollY - 4,
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8,
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8
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];
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handlers["e"] = [
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elementX2 - margin + sceneState.scrollX - marginX,
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elementY1 + (elementY2 - elementY1) / 2 + sceneState.scrollY - 4,
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8,
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8
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];
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}
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handlers["nw"] = [
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elementX1 - margin + sceneState.scrollX + marginX,
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elementY1 - margin + sceneState.scrollY + marginY,
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8,
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8
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]; // nw
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handlers["ne"] = [
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elementX2 - margin + sceneState.scrollX - marginX,
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elementY1 - margin + sceneState.scrollY + marginY,
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8,
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8
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]; // ne
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handlers["sw"] = [
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elementX1 - margin + sceneState.scrollX + marginX,
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elementY2 - margin + sceneState.scrollY - marginY,
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8,
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8
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]; // sw
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handlers["se"] = [
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elementX2 - margin + sceneState.scrollX - marginX,
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elementY2 - margin + sceneState.scrollY - marginY,
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8,
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8
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]; // se
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return handlers;
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}
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function renderScene(
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rc: RoughCanvas,
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canvas: HTMLCanvasElement,
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sceneState: SceneState,
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// extra options, currently passed by export helper
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{
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offsetX,
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offsetY,
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renderScrollbars = true,
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renderSelection = true
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}: {
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offsetX?: number;
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offsetY?: number;
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renderScrollbars?: boolean;
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renderSelection?: boolean;
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} = {}
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) {
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if (!canvas) return;
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const context = canvas.getContext("2d")!;
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const fillStyle = context.fillStyle;
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if (typeof sceneState.viewBackgroundColor === "string") {
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context.fillStyle = sceneState.viewBackgroundColor;
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context.fillRect(0, 0, canvas.width, canvas.height);
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} else {
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context.clearRect(0, 0, canvas.width, canvas.height);
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}
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context.fillStyle = fillStyle;
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const selectedIndices = getSelectedIndices();
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sceneState = {
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...sceneState,
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scrollX: typeof offsetX === "number" ? offsetX : sceneState.scrollX,
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scrollY: typeof offsetY === "number" ? offsetY : sceneState.scrollY
|
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};
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elements.forEach(element => {
|
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element.draw(rc, context, sceneState);
|
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if (renderSelection && element.isSelected) {
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const margin = 4;
|
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const elementX1 = getElementAbsoluteX1(element);
|
||
const elementX2 = getElementAbsoluteX2(element);
|
||
const elementY1 = getElementAbsoluteY1(element);
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const elementY2 = getElementAbsoluteY2(element);
|
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const lineDash = context.getLineDash();
|
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context.setLineDash([8, 4]);
|
||
context.strokeRect(
|
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elementX1 - margin + sceneState.scrollX,
|
||
elementY1 - margin + sceneState.scrollY,
|
||
elementX2 - elementX1 + margin * 2,
|
||
elementY2 - elementY1 + margin * 2
|
||
);
|
||
context.setLineDash(lineDash);
|
||
|
||
if (
|
||
element.type !== "text" &&
|
||
element.type !== "arrow" &&
|
||
selectedIndices.length === 1
|
||
) {
|
||
const handlers = handlerRectangles(element, sceneState);
|
||
Object.values(handlers).forEach(handler => {
|
||
context.strokeRect(handler[0], handler[1], handler[2], handler[3]);
|
||
});
|
||
}
|
||
}
|
||
});
|
||
|
||
if (renderScrollbars) {
|
||
const scrollBars = getScrollbars(
|
||
context.canvas.width / window.devicePixelRatio,
|
||
context.canvas.height / window.devicePixelRatio,
|
||
sceneState.scrollX,
|
||
sceneState.scrollY
|
||
);
|
||
|
||
context.fillStyle = SCROLLBAR_COLOR;
|
||
context.fillRect(
|
||
scrollBars.horizontal.x,
|
||
scrollBars.horizontal.y,
|
||
scrollBars.horizontal.width,
|
||
scrollBars.horizontal.height
|
||
);
|
||
context.fillRect(
|
||
scrollBars.vertical.x,
|
||
scrollBars.vertical.y,
|
||
scrollBars.vertical.width,
|
||
scrollBars.vertical.height
|
||
);
|
||
context.fillStyle = fillStyle;
|
||
}
|
||
}
|
||
|
||
function saveAsJSON() {
|
||
const serialized = JSON.stringify({
|
||
version: 1,
|
||
source: window.location.origin,
|
||
elements
|
||
});
|
||
|
||
saveFile(
|
||
"excalidraw.json",
|
||
"data:text/plain;charset=utf-8," + encodeURIComponent(serialized)
|
||
);
|
||
}
|
||
|
||
function loadFromJSON() {
|
||
const input = document.createElement("input");
|
||
const reader = new FileReader();
|
||
input.type = "file";
|
||
input.accept = ".json";
|
||
|
||
input.onchange = () => {
|
||
if (!input.files!.length) {
|
||
alert("A file was not selected.");
|
||
return;
|
||
}
|
||
|
||
reader.readAsText(input.files![0], "utf8");
|
||
};
|
||
|
||
input.click();
|
||
|
||
return new Promise(resolve => {
|
||
reader.onloadend = () => {
|
||
if (reader.readyState === FileReader.DONE) {
|
||
const data = JSON.parse(reader.result as string);
|
||
restore(data.elements, null);
|
||
resolve();
|
||
}
|
||
};
|
||
});
|
||
}
|
||
|
||
function exportAsPNG({
|
||
exportBackground,
|
||
exportPadding = 10,
|
||
viewBackgroundColor
|
||
}: {
|
||
exportBackground: boolean;
|
||
exportPadding?: number;
|
||
viewBackgroundColor: string;
|
||
scrollX: number;
|
||
scrollY: number;
|
||
}) {
|
||
if (!elements.length) return window.alert("Cannot export empty canvas.");
|
||
|
||
// calculate smallest area to fit the contents in
|
||
|
||
let subCanvasX1 = Infinity;
|
||
let subCanvasX2 = 0;
|
||
let subCanvasY1 = Infinity;
|
||
let subCanvasY2 = 0;
|
||
|
||
elements.forEach(element => {
|
||
subCanvasX1 = Math.min(subCanvasX1, getElementAbsoluteX1(element));
|
||
subCanvasX2 = Math.max(subCanvasX2, getElementAbsoluteX2(element));
|
||
subCanvasY1 = Math.min(subCanvasY1, getElementAbsoluteY1(element));
|
||
subCanvasY2 = Math.max(subCanvasY2, getElementAbsoluteY2(element));
|
||
});
|
||
|
||
function distance(x: number, y: number) {
|
||
return Math.abs(x > y ? x - y : y - x);
|
||
}
|
||
|
||
const tempCanvas = document.createElement("canvas");
|
||
tempCanvas.style.display = "none";
|
||
document.body.appendChild(tempCanvas);
|
||
tempCanvas.width = distance(subCanvasX1, subCanvasX2) + exportPadding * 2;
|
||
tempCanvas.height = distance(subCanvasY1, subCanvasY2) + exportPadding * 2;
|
||
|
||
renderScene(
|
||
rough.canvas(tempCanvas),
|
||
tempCanvas,
|
||
{
|
||
viewBackgroundColor: exportBackground ? viewBackgroundColor : null,
|
||
scrollX: 0,
|
||
scrollY: 0
|
||
},
|
||
{
|
||
offsetX: -subCanvasX1 + exportPadding,
|
||
offsetY: -subCanvasY1 + exportPadding,
|
||
renderScrollbars: false,
|
||
renderSelection: false
|
||
}
|
||
);
|
||
|
||
saveFile("excalidraw.png", tempCanvas.toDataURL("image/png"));
|
||
|
||
// clean up the DOM
|
||
if (tempCanvas !== canvas) tempCanvas.remove();
|
||
}
|
||
|
||
function saveFile(name: string, data: string) {
|
||
// create a temporary <a> elem which we'll use to download the image
|
||
const link = document.createElement("a");
|
||
link.setAttribute("download", name);
|
||
link.setAttribute("href", data);
|
||
link.click();
|
||
|
||
// clean up
|
||
link.remove();
|
||
}
|
||
|
||
function rotate(x1: number, y1: number, x2: number, y2: number, angle: number) {
|
||
// 𝑎′𝑥=(𝑎𝑥−𝑐𝑥)cos𝜃−(𝑎𝑦−𝑐𝑦)sin𝜃+𝑐𝑥
|
||
// 𝑎′𝑦=(𝑎𝑥−𝑐𝑥)sin𝜃+(𝑎𝑦−𝑐𝑦)cos𝜃+𝑐𝑦.
|
||
// https://math.stackexchange.com/questions/2204520/how-do-i-rotate-a-line-segment-in-a-specific-point-on-the-line
|
||
return [
|
||
(x1 - x2) * Math.cos(angle) - (y1 - y2) * Math.sin(angle) + x2,
|
||
(x1 - x2) * Math.sin(angle) + (y1 - y2) * Math.cos(angle) + y2
|
||
];
|
||
}
|
||
|
||
// Casting second argument (DrawingSurface) to any,
|
||
// because it is requred by TS definitions and not required at runtime
|
||
const generator = rough.generator(null, null as any);
|
||
|
||
function isTextElement(
|
||
element: ExcalidrawElement
|
||
): element is ExcalidrawTextElement {
|
||
return element.type === "text";
|
||
}
|
||
|
||
function isInputLike(
|
||
target: Element | EventTarget | null
|
||
): target is HTMLInputElement | HTMLTextAreaElement | HTMLSelectElement {
|
||
return (
|
||
target instanceof HTMLInputElement ||
|
||
target instanceof HTMLTextAreaElement ||
|
||
target instanceof HTMLSelectElement
|
||
);
|
||
}
|
||
|
||
function getArrowPoints(element: ExcalidrawElement) {
|
||
const x1 = 0;
|
||
const y1 = 0;
|
||
const x2 = element.width;
|
||
const y2 = element.height;
|
||
|
||
const size = 30; // pixels
|
||
const distance = Math.hypot(x2 - x1, y2 - y1);
|
||
// Scale down the arrow until we hit a certain size so that it doesn't look weird
|
||
const minSize = Math.min(size, distance / 2);
|
||
const xs = x2 - ((x2 - x1) / distance) * minSize;
|
||
const ys = y2 - ((y2 - y1) / distance) * minSize;
|
||
|
||
const angle = 20; // degrees
|
||
const [x3, y3] = rotate(xs, ys, x2, y2, (-angle * Math.PI) / 180);
|
||
const [x4, y4] = rotate(xs, ys, x2, y2, (angle * Math.PI) / 180);
|
||
|
||
return [x1, y1, x2, y2, x3, y3, x4, y4];
|
||
}
|
||
|
||
function generateDraw(element: ExcalidrawElement) {
|
||
if (element.type === "selection") {
|
||
element.draw = (rc, context, { scrollX, scrollY }) => {
|
||
const fillStyle = context.fillStyle;
|
||
context.fillStyle = "rgba(0, 0, 255, 0.10)";
|
||
context.fillRect(
|
||
element.x + scrollX,
|
||
element.y + scrollY,
|
||
element.width,
|
||
element.height
|
||
);
|
||
context.fillStyle = fillStyle;
|
||
};
|
||
} else if (element.type === "rectangle") {
|
||
const shape = withCustomMathRandom(element.seed, () => {
|
||
return generator.rectangle(0, 0, element.width, element.height, {
|
||
stroke: element.strokeColor,
|
||
fill: element.backgroundColor
|
||
});
|
||
});
|
||
element.draw = (rc, context, { scrollX, scrollY }) => {
|
||
context.translate(element.x + scrollX, element.y + scrollY);
|
||
rc.draw(shape);
|
||
context.translate(-element.x - scrollX, -element.y - scrollY);
|
||
};
|
||
} else if (element.type === "ellipse") {
|
||
const shape = withCustomMathRandom(element.seed, () =>
|
||
generator.ellipse(
|
||
element.width / 2,
|
||
element.height / 2,
|
||
element.width,
|
||
element.height,
|
||
{ stroke: element.strokeColor, fill: element.backgroundColor }
|
||
)
|
||
);
|
||
element.draw = (rc, context, { scrollX, scrollY }) => {
|
||
context.translate(element.x + scrollX, element.y + scrollY);
|
||
rc.draw(shape);
|
||
context.translate(-element.x - scrollX, -element.y - scrollY);
|
||
};
|
||
} else if (element.type === "arrow") {
|
||
const [x1, y1, x2, y2, x3, y3, x4, y4] = getArrowPoints(element);
|
||
const shapes = withCustomMathRandom(element.seed, () => [
|
||
// \
|
||
generator.line(x3, y3, x2, y2, { stroke: element.strokeColor }),
|
||
// -----
|
||
generator.line(x1, y1, x2, y2, { stroke: element.strokeColor }),
|
||
// /
|
||
generator.line(x4, y4, x2, y2, { stroke: element.strokeColor })
|
||
]);
|
||
|
||
element.draw = (rc, context, { scrollX, scrollY }) => {
|
||
context.translate(element.x + scrollX, element.y + scrollY);
|
||
shapes.forEach(shape => rc.draw(shape));
|
||
context.translate(-element.x - scrollX, -element.y - scrollY);
|
||
};
|
||
return;
|
||
} else if (isTextElement(element)) {
|
||
element.draw = (rc, context, { scrollX, scrollY }) => {
|
||
const font = context.font;
|
||
context.font = element.font;
|
||
const fillStyle = context.fillStyle;
|
||
context.fillStyle = element.strokeColor;
|
||
context.fillText(
|
||
element.text,
|
||
element.x + scrollX,
|
||
element.y + element.actualBoundingBoxAscent + scrollY
|
||
);
|
||
context.fillStyle = fillStyle;
|
||
context.font = font;
|
||
};
|
||
} else {
|
||
throw new Error("Unimplemented type " + element.type);
|
||
}
|
||
}
|
||
|
||
// If the element is created from right to left, the width is going to be negative
|
||
// This set of functions retrieves the absolute position of the 4 points.
|
||
// We can't just always normalize it since we need to remember the fact that an arrow
|
||
// is pointing left or right.
|
||
function getElementAbsoluteX1(element: ExcalidrawElement) {
|
||
return element.width >= 0 ? element.x : element.x + element.width;
|
||
}
|
||
function getElementAbsoluteX2(element: ExcalidrawElement) {
|
||
return element.width >= 0 ? element.x + element.width : element.x;
|
||
}
|
||
function getElementAbsoluteY1(element: ExcalidrawElement) {
|
||
return element.height >= 0 ? element.y : element.y + element.height;
|
||
}
|
||
function getElementAbsoluteY2(element: ExcalidrawElement) {
|
||
return element.height >= 0 ? element.y + element.height : element.y;
|
||
}
|
||
|
||
function setSelection(selection: ExcalidrawElement) {
|
||
const selectionX1 = getElementAbsoluteX1(selection);
|
||
const selectionX2 = getElementAbsoluteX2(selection);
|
||
const selectionY1 = getElementAbsoluteY1(selection);
|
||
const selectionY2 = getElementAbsoluteY2(selection);
|
||
elements.forEach(element => {
|
||
const elementX1 = getElementAbsoluteX1(element);
|
||
const elementX2 = getElementAbsoluteX2(element);
|
||
const elementY1 = getElementAbsoluteY1(element);
|
||
const elementY2 = getElementAbsoluteY2(element);
|
||
element.isSelected =
|
||
element.type !== "selection" &&
|
||
selectionX1 <= elementX1 &&
|
||
selectionY1 <= elementY1 &&
|
||
selectionX2 >= elementX2 &&
|
||
selectionY2 >= elementY2;
|
||
});
|
||
}
|
||
|
||
function clearSelection() {
|
||
elements.forEach(element => {
|
||
element.isSelected = false;
|
||
});
|
||
}
|
||
|
||
function resetCursor() {
|
||
document.documentElement.style.cursor = "";
|
||
}
|
||
|
||
function deleteSelectedElements() {
|
||
for (let i = elements.length - 1; i >= 0; --i) {
|
||
if (elements[i].isSelected) {
|
||
elements.splice(i, 1);
|
||
}
|
||
}
|
||
}
|
||
|
||
function save(state: AppState) {
|
||
localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(elements));
|
||
localStorage.setItem(LOCAL_STORAGE_KEY_STATE, JSON.stringify(state));
|
||
}
|
||
|
||
function restoreFromLocalStorage() {
|
||
const savedElements = localStorage.getItem(LOCAL_STORAGE_KEY);
|
||
const savedState = localStorage.getItem(LOCAL_STORAGE_KEY_STATE);
|
||
|
||
return restore(savedElements, savedState);
|
||
}
|
||
|
||
function restore(
|
||
savedElements: string | ExcalidrawElement[] | null,
|
||
savedState: string | null
|
||
) {
|
||
try {
|
||
if (savedElements) {
|
||
elements.splice(
|
||
0,
|
||
elements.length,
|
||
...(typeof savedElements === "string"
|
||
? JSON.parse(savedElements)
|
||
: savedElements)
|
||
);
|
||
elements.forEach((element: ExcalidrawElement) => generateDraw(element));
|
||
}
|
||
|
||
return savedState ? JSON.parse(savedState) : null;
|
||
} catch (e) {
|
||
elements.splice(0, elements.length);
|
||
return null;
|
||
}
|
||
}
|
||
|
||
type AppState = {
|
||
draggingElement: ExcalidrawElement | null;
|
||
resizingElement: ExcalidrawElement | null;
|
||
elementType: string;
|
||
exportBackground: boolean;
|
||
currentItemStrokeColor: string;
|
||
currentItemBackgroundColor: string;
|
||
viewBackgroundColor: string;
|
||
scrollX: number;
|
||
scrollY: number;
|
||
};
|
||
|
||
const KEYS = {
|
||
ARROW_LEFT: "ArrowLeft",
|
||
ARROW_RIGHT: "ArrowRight",
|
||
ARROW_DOWN: "ArrowDown",
|
||
ARROW_UP: "ArrowUp",
|
||
ESCAPE: "Escape",
|
||
DELETE: "Delete",
|
||
BACKSPACE: "Backspace"
|
||
};
|
||
|
||
// We inline font-awesome icons in order to save on js size rather than including the font awesome react library
|
||
const SHAPES = [
|
||
{
|
||
icon: (
|
||
// fa-mouse-pointer
|
||
<svg viewBox="0 0 320 512">
|
||
<path d="M302.189 329.126H196.105l55.831 135.993c3.889 9.428-.555 19.999-9.444 23.999l-49.165 21.427c-9.165 4-19.443-.571-23.332-9.714l-53.053-129.136-86.664 89.138C18.729 472.71 0 463.554 0 447.977V18.299C0 1.899 19.921-6.096 30.277 5.443l284.412 292.542c11.472 11.179 3.007 31.141-12.5 31.141z" />
|
||
</svg>
|
||
),
|
||
value: "selection"
|
||
},
|
||
{
|
||
icon: (
|
||
// fa-square
|
||
<svg viewBox="0 0 448 512">
|
||
<path d="M400 32H48C21.5 32 0 53.5 0 80v352c0 26.5 21.5 48 48 48h352c26.5 0 48-21.5 48-48V80c0-26.5-21.5-48-48-48z" />
|
||
</svg>
|
||
),
|
||
value: "rectangle"
|
||
},
|
||
{
|
||
icon: (
|
||
// fa-circle
|
||
<svg viewBox="0 0 512 512">
|
||
<path d="M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z" />
|
||
</svg>
|
||
),
|
||
value: "ellipse"
|
||
},
|
||
{
|
||
icon: (
|
||
// fa-long-arrow-alt-right
|
||
<svg viewBox="0 0 448 512">
|
||
<path d="M313.941 216H12c-6.627 0-12 5.373-12 12v56c0 6.627 5.373 12 12 12h301.941v46.059c0 21.382 25.851 32.09 40.971 16.971l86.059-86.059c9.373-9.373 9.373-24.569 0-33.941l-86.059-86.059c-15.119-15.119-40.971-4.411-40.971 16.971V216z" />
|
||
</svg>
|
||
),
|
||
value: "arrow"
|
||
},
|
||
{
|
||
icon: (
|
||
// fa-font
|
||
<svg viewBox="0 0 448 512">
|
||
<path d="M432 416h-23.41L277.88 53.69A32 32 0 0 0 247.58 32h-47.16a32 32 0 0 0-30.3 21.69L39.41 416H16a16 16 0 0 0-16 16v32a16 16 0 0 0 16 16h128a16 16 0 0 0 16-16v-32a16 16 0 0 0-16-16h-19.58l23.3-64h152.56l23.3 64H304a16 16 0 0 0-16 16v32a16 16 0 0 0 16 16h128a16 16 0 0 0 16-16v-32a16 16 0 0 0-16-16zM176.85 272L224 142.51 271.15 272z" />
|
||
</svg>
|
||
),
|
||
value: "text"
|
||
}
|
||
];
|
||
|
||
const shapesShortcutKeys = SHAPES.map(shape => shape.value[0]);
|
||
|
||
function findElementByKey(key: string) {
|
||
const defaultElement = "selection";
|
||
return SHAPES.reduce((element, shape) => {
|
||
if (shape.value[0] !== key) return element;
|
||
|
||
return shape.value;
|
||
}, defaultElement);
|
||
}
|
||
|
||
function isArrowKey(keyCode: string) {
|
||
return (
|
||
keyCode === KEYS.ARROW_LEFT ||
|
||
keyCode === KEYS.ARROW_RIGHT ||
|
||
keyCode === KEYS.ARROW_DOWN ||
|
||
keyCode === KEYS.ARROW_UP
|
||
);
|
||
}
|
||
|
||
function getSelectedIndices() {
|
||
const selectedIndices: number[] = [];
|
||
elements.forEach((element, index) => {
|
||
if (element.isSelected) {
|
||
selectedIndices.push(index);
|
||
}
|
||
});
|
||
return selectedIndices;
|
||
}
|
||
|
||
const someElementIsSelected = () =>
|
||
elements.some(element => element.isSelected);
|
||
|
||
const ELEMENT_SHIFT_TRANSLATE_AMOUNT = 5;
|
||
const ELEMENT_TRANSLATE_AMOUNT = 1;
|
||
|
||
let lastCanvasWidth = -1;
|
||
let lastCanvasHeight = -1;
|
||
|
||
let lastMouseUp: ((e: any) => void) | null = null;
|
||
|
||
class App extends React.Component<{}, AppState> {
|
||
public componentDidMount() {
|
||
document.addEventListener("keydown", this.onKeyDown, false);
|
||
window.addEventListener("resize", this.onResize, false);
|
||
|
||
const savedState = restoreFromLocalStorage();
|
||
if (savedState) {
|
||
this.setState(savedState);
|
||
}
|
||
}
|
||
|
||
public componentWillUnmount() {
|
||
document.removeEventListener("keydown", this.onKeyDown, false);
|
||
window.removeEventListener("resize", this.onResize, false);
|
||
}
|
||
|
||
public state: AppState = {
|
||
draggingElement: null,
|
||
resizingElement: null,
|
||
elementType: "selection",
|
||
exportBackground: true,
|
||
currentItemStrokeColor: "#000000",
|
||
currentItemBackgroundColor: "#ffffff",
|
||
viewBackgroundColor: "#ffffff",
|
||
scrollX: 0,
|
||
scrollY: 0
|
||
};
|
||
|
||
private onResize = () => {
|
||
this.forceUpdate();
|
||
};
|
||
|
||
private onKeyDown = (event: KeyboardEvent) => {
|
||
if (isInputLike(event.target)) return;
|
||
|
||
if (event.key === KEYS.ESCAPE) {
|
||
clearSelection();
|
||
this.forceUpdate();
|
||
event.preventDefault();
|
||
} else if (event.key === KEYS.BACKSPACE || event.key === KEYS.DELETE) {
|
||
deleteSelectedElements();
|
||
this.forceUpdate();
|
||
event.preventDefault();
|
||
} else if (isArrowKey(event.key)) {
|
||
const step = event.shiftKey
|
||
? ELEMENT_SHIFT_TRANSLATE_AMOUNT
|
||
: ELEMENT_TRANSLATE_AMOUNT;
|
||
elements.forEach(element => {
|
||
if (element.isSelected) {
|
||
if (event.key === KEYS.ARROW_LEFT) element.x -= step;
|
||
else if (event.key === KEYS.ARROW_RIGHT) element.x += step;
|
||
else if (event.key === KEYS.ARROW_UP) element.y -= step;
|
||
else if (event.key === KEYS.ARROW_DOWN) element.y += step;
|
||
}
|
||
});
|
||
this.forceUpdate();
|
||
event.preventDefault();
|
||
|
||
// Send backward: Cmd-Shift-Alt-B
|
||
} else if (
|
||
event.metaKey &&
|
||
event.shiftKey &&
|
||
event.altKey &&
|
||
event.code === "KeyB"
|
||
) {
|
||
this.moveOneLeft();
|
||
event.preventDefault();
|
||
|
||
// Send to back: Cmd-Shift-B
|
||
} else if (event.metaKey && event.shiftKey && event.code === "KeyB") {
|
||
this.moveAllLeft();
|
||
event.preventDefault();
|
||
|
||
// Bring forward: Cmd-Shift-Alt-F
|
||
} else if (
|
||
event.metaKey &&
|
||
event.shiftKey &&
|
||
event.altKey &&
|
||
event.code === "KeyF"
|
||
) {
|
||
this.moveOneRight();
|
||
event.preventDefault();
|
||
|
||
// Bring to front: Cmd-Shift-F
|
||
} else if (event.metaKey && event.shiftKey && event.code === "KeyF") {
|
||
this.moveAllRight();
|
||
event.preventDefault();
|
||
|
||
// Select all: Cmd-A
|
||
} else if (event.metaKey && event.code === "KeyA") {
|
||
elements.forEach(element => {
|
||
element.isSelected = true;
|
||
});
|
||
this.forceUpdate();
|
||
event.preventDefault();
|
||
} else if (shapesShortcutKeys.includes(event.key.toLowerCase())) {
|
||
this.setState({ elementType: findElementByKey(event.key) });
|
||
} else if (event.metaKey && event.code === "KeyZ") {
|
||
let lastEntry = stateHistory.pop();
|
||
// If nothing was changed since last, take the previous one
|
||
if (generateHistoryCurrentEntry() === lastEntry) {
|
||
lastEntry = stateHistory.pop();
|
||
}
|
||
if (lastEntry !== undefined) {
|
||
restoreHistoryEntry(lastEntry);
|
||
}
|
||
this.forceUpdate();
|
||
event.preventDefault();
|
||
}
|
||
};
|
||
|
||
private deleteSelectedElements = () => {
|
||
deleteSelectedElements();
|
||
this.forceUpdate();
|
||
};
|
||
|
||
private clearCanvas = () => {
|
||
if (window.confirm("This will clear the whole canvas. Are you sure?")) {
|
||
elements.splice(0, elements.length);
|
||
this.setState({
|
||
viewBackgroundColor: "#ffffff",
|
||
scrollX: 0,
|
||
scrollY: 0
|
||
});
|
||
this.forceUpdate();
|
||
}
|
||
};
|
||
|
||
private moveAllLeft = () => {
|
||
moveAllLeft(elements, getSelectedIndices());
|
||
this.forceUpdate();
|
||
};
|
||
|
||
private moveOneLeft = () => {
|
||
moveOneLeft(elements, getSelectedIndices());
|
||
this.forceUpdate();
|
||
};
|
||
|
||
private moveAllRight = () => {
|
||
moveAllRight(elements, getSelectedIndices());
|
||
this.forceUpdate();
|
||
};
|
||
|
||
private moveOneRight = () => {
|
||
moveOneRight(elements, getSelectedIndices());
|
||
this.forceUpdate();
|
||
};
|
||
|
||
private removeWheelEventListener: (() => void) | undefined;
|
||
|
||
public render() {
|
||
const canvasWidth = window.innerWidth - CANVAS_WINDOW_OFFSET_LEFT;
|
||
const canvasHeight = window.innerHeight - CANVAS_WINDOW_OFFSET_TOP;
|
||
|
||
return (
|
||
<div
|
||
className="container"
|
||
onCut={e => {
|
||
e.clipboardData.setData(
|
||
"text/plain",
|
||
JSON.stringify(elements.filter(element => element.isSelected))
|
||
);
|
||
deleteSelectedElements();
|
||
this.forceUpdate();
|
||
e.preventDefault();
|
||
}}
|
||
onCopy={e => {
|
||
e.clipboardData.setData(
|
||
"text/plain",
|
||
JSON.stringify(elements.filter(element => element.isSelected))
|
||
);
|
||
e.preventDefault();
|
||
}}
|
||
onPaste={e => {
|
||
const paste = e.clipboardData.getData("text");
|
||
let parsedElements;
|
||
try {
|
||
parsedElements = JSON.parse(paste);
|
||
} catch (e) {}
|
||
if (
|
||
Array.isArray(parsedElements) &&
|
||
parsedElements.length > 0 &&
|
||
parsedElements[0].type // need to implement a better check here...
|
||
) {
|
||
clearSelection();
|
||
parsedElements.forEach(parsedElement => {
|
||
parsedElement.x += 10;
|
||
parsedElement.y += 10;
|
||
parsedElement.seed = randomSeed();
|
||
generateDraw(parsedElement);
|
||
elements.push(parsedElement);
|
||
});
|
||
this.forceUpdate();
|
||
}
|
||
e.preventDefault();
|
||
}}
|
||
>
|
||
<div className="sidePanel">
|
||
<h4>Shapes</h4>
|
||
<div className="panelTools">
|
||
{SHAPES.map(({ value, icon }) => (
|
||
<label key={value} className="tool">
|
||
<input
|
||
type="radio"
|
||
checked={this.state.elementType === value}
|
||
onChange={() => {
|
||
this.setState({ elementType: value });
|
||
clearSelection();
|
||
document.documentElement.style.cursor =
|
||
value === "text" ? "text" : "crosshair";
|
||
this.forceUpdate();
|
||
}}
|
||
/>
|
||
<div className="toolIcon">{icon}</div>
|
||
</label>
|
||
))}
|
||
</div>
|
||
<h4>Colors</h4>
|
||
<div className="panelColumn">
|
||
<label>
|
||
<input
|
||
type="color"
|
||
value={this.state.viewBackgroundColor}
|
||
onChange={e => {
|
||
this.setState({ viewBackgroundColor: e.target.value });
|
||
}}
|
||
/>
|
||
Background
|
||
</label>
|
||
<label>
|
||
<input
|
||
type="color"
|
||
value={this.state.currentItemStrokeColor}
|
||
onChange={e => {
|
||
this.setState({ currentItemStrokeColor: e.target.value });
|
||
}}
|
||
/>
|
||
Shape Stroke
|
||
</label>
|
||
<label>
|
||
<input
|
||
type="color"
|
||
value={this.state.currentItemBackgroundColor}
|
||
onChange={e => {
|
||
this.setState({ currentItemBackgroundColor: e.target.value });
|
||
}}
|
||
/>
|
||
Shape Background
|
||
</label>
|
||
</div>
|
||
<h4>Canvas</h4>
|
||
<div className="panelColumn">
|
||
<button
|
||
onClick={this.clearCanvas}
|
||
title="Clear the canvas & reset background color"
|
||
>
|
||
Clear canvas
|
||
</button>
|
||
</div>
|
||
<h4>Export</h4>
|
||
<div className="panelColumn">
|
||
<button
|
||
onClick={() => {
|
||
exportAsPNG(this.state);
|
||
}}
|
||
>
|
||
Export to png
|
||
</button>
|
||
<label>
|
||
<input
|
||
type="checkbox"
|
||
checked={this.state.exportBackground}
|
||
onChange={e => {
|
||
this.setState({ exportBackground: e.target.checked });
|
||
}}
|
||
/>
|
||
background
|
||
</label>
|
||
</div>
|
||
<h4>Save/Load</h4>
|
||
<div className="panelColumn">
|
||
<button
|
||
onClick={() => {
|
||
saveAsJSON();
|
||
}}
|
||
>
|
||
Save as...
|
||
</button>
|
||
<button
|
||
onClick={() => {
|
||
loadFromJSON().then(() => this.forceUpdate());
|
||
}}
|
||
>
|
||
Load file...
|
||
</button>
|
||
</div>
|
||
{someElementIsSelected() && (
|
||
<>
|
||
<h4>Shape options</h4>
|
||
<div className="panelColumn">
|
||
<button onClick={this.deleteSelectedElements}>Delete</button>
|
||
<button onClick={this.moveOneRight}>Bring forward</button>
|
||
<button onClick={this.moveAllRight}>Bring to front</button>
|
||
<button onClick={this.moveOneLeft}>Send backward</button>
|
||
<button onClick={this.moveAllLeft}>Send to back</button>
|
||
</div>
|
||
</>
|
||
)}
|
||
</div>
|
||
<canvas
|
||
id="canvas"
|
||
style={{
|
||
width: canvasWidth,
|
||
height: canvasHeight
|
||
}}
|
||
width={canvasWidth * window.devicePixelRatio}
|
||
height={canvasHeight * window.devicePixelRatio}
|
||
ref={canvas => {
|
||
if (this.removeWheelEventListener) {
|
||
this.removeWheelEventListener();
|
||
this.removeWheelEventListener = undefined;
|
||
}
|
||
if (canvas) {
|
||
canvas.addEventListener("wheel", this.handleWheel, {
|
||
passive: false
|
||
});
|
||
this.removeWheelEventListener = () =>
|
||
canvas.removeEventListener("wheel", this.handleWheel);
|
||
|
||
// Whenever React sets the width/height of the canvas element,
|
||
// the context loses the scale transform. We need to re-apply it
|
||
if (
|
||
canvasWidth !== lastCanvasWidth ||
|
||
canvasHeight !== lastCanvasHeight
|
||
) {
|
||
lastCanvasWidth = canvasWidth;
|
||
lastCanvasHeight = canvasHeight;
|
||
canvas
|
||
.getContext("2d")!
|
||
.scale(window.devicePixelRatio, window.devicePixelRatio);
|
||
}
|
||
}
|
||
}}
|
||
onMouseDown={e => {
|
||
if (lastMouseUp !== null) {
|
||
// Unfortunately, sometimes we don't get a mouseup after a mousedown,
|
||
// this can happen when a contextual menu or alert is triggered. In order to avoid
|
||
// being in a weird state, we clean up on the next mousedown
|
||
lastMouseUp(e);
|
||
}
|
||
// only handle left mouse button
|
||
if (e.button !== 0) return;
|
||
// fixes mousemove causing selection of UI texts #32
|
||
e.preventDefault();
|
||
// Preventing the event above disables default behavior
|
||
// of defocusing potentially focused input, which is what we want
|
||
// when clicking inside the canvas.
|
||
if (isInputLike(document.activeElement)) {
|
||
document.activeElement.blur();
|
||
}
|
||
|
||
// Handle scrollbars dragging
|
||
const {
|
||
isOverHorizontalScrollBar,
|
||
isOverVerticalScrollBar
|
||
} = isOverScrollBars(
|
||
e.clientX - CANVAS_WINDOW_OFFSET_LEFT,
|
||
e.clientY - CANVAS_WINDOW_OFFSET_TOP,
|
||
canvasWidth,
|
||
canvasHeight,
|
||
this.state.scrollX,
|
||
this.state.scrollY
|
||
);
|
||
|
||
const x =
|
||
e.clientX - CANVAS_WINDOW_OFFSET_LEFT - this.state.scrollX;
|
||
const y = e.clientY - CANVAS_WINDOW_OFFSET_TOP - this.state.scrollY;
|
||
const element = newElement(
|
||
this.state.elementType,
|
||
x,
|
||
y,
|
||
this.state.currentItemStrokeColor,
|
||
this.state.currentItemBackgroundColor
|
||
);
|
||
let resizeHandle: string | false = false;
|
||
let isDraggingElements = false;
|
||
let isResizingElements = false;
|
||
if (this.state.elementType === "selection") {
|
||
const resizeElement = elements.find(element => {
|
||
return resizeTest(element, x, y, {
|
||
scrollX: this.state.scrollX,
|
||
scrollY: this.state.scrollY,
|
||
viewBackgroundColor: this.state.viewBackgroundColor
|
||
});
|
||
});
|
||
|
||
this.setState({
|
||
resizingElement: resizeElement ? resizeElement : null
|
||
});
|
||
|
||
if (resizeElement) {
|
||
resizeHandle = resizeTest(resizeElement, x, y, {
|
||
scrollX: this.state.scrollX,
|
||
scrollY: this.state.scrollY,
|
||
viewBackgroundColor: this.state.viewBackgroundColor
|
||
});
|
||
document.documentElement.style.cursor = `${resizeHandle}-resize`;
|
||
isResizingElements = true;
|
||
} else {
|
||
let hitElement = null;
|
||
// We need to to hit testing from front (end of the array) to back (beginning of the array)
|
||
for (let i = elements.length - 1; i >= 0; --i) {
|
||
if (hitTest(elements[i], x, y)) {
|
||
hitElement = elements[i];
|
||
break;
|
||
}
|
||
}
|
||
|
||
// If we click on something
|
||
if (hitElement) {
|
||
if (hitElement.isSelected) {
|
||
// If that element is not already selected, do nothing,
|
||
// we're likely going to drag it
|
||
} else {
|
||
// We unselect every other elements unless shift is pressed
|
||
if (!e.shiftKey) {
|
||
clearSelection();
|
||
}
|
||
// No matter what, we select it
|
||
hitElement.isSelected = true;
|
||
}
|
||
} else {
|
||
// If we don't click on anything, let's remove all the selected elements
|
||
clearSelection();
|
||
}
|
||
|
||
isDraggingElements = someElementIsSelected();
|
||
|
||
if (isDraggingElements) {
|
||
document.documentElement.style.cursor = "move";
|
||
}
|
||
}
|
||
}
|
||
|
||
if (isTextElement(element)) {
|
||
resetCursor();
|
||
const text = prompt("What text do you want?");
|
||
if (text === null) {
|
||
return;
|
||
}
|
||
const fontSize = 20;
|
||
element.text = text;
|
||
element.font = `${fontSize}px Virgil`;
|
||
const font = context.font;
|
||
context.font = element.font;
|
||
const textMeasure = context.measureText(element.text);
|
||
const width = textMeasure.width;
|
||
const actualBoundingBoxAscent =
|
||
textMeasure.actualBoundingBoxAscent || fontSize;
|
||
const actualBoundingBoxDescent =
|
||
textMeasure.actualBoundingBoxDescent || 0;
|
||
element.actualBoundingBoxAscent = actualBoundingBoxAscent;
|
||
context.font = font;
|
||
const height = actualBoundingBoxAscent + actualBoundingBoxDescent;
|
||
// Center the text
|
||
element.x -= width / 2;
|
||
element.y -= actualBoundingBoxAscent;
|
||
element.width = width;
|
||
element.height = height;
|
||
}
|
||
|
||
generateDraw(element);
|
||
elements.push(element);
|
||
if (this.state.elementType === "text") {
|
||
this.setState({
|
||
draggingElement: null,
|
||
elementType: "selection"
|
||
});
|
||
element.isSelected = true;
|
||
} else {
|
||
this.setState({ draggingElement: element });
|
||
}
|
||
|
||
let lastX = x;
|
||
let lastY = y;
|
||
|
||
if (isOverHorizontalScrollBar || isOverVerticalScrollBar) {
|
||
lastX = e.clientX - CANVAS_WINDOW_OFFSET_LEFT;
|
||
lastY = e.clientY - CANVAS_WINDOW_OFFSET_TOP;
|
||
}
|
||
|
||
const onMouseMove = (e: MouseEvent) => {
|
||
const target = e.target;
|
||
if (!(target instanceof HTMLElement)) {
|
||
return;
|
||
}
|
||
|
||
if (isOverHorizontalScrollBar) {
|
||
const x = e.clientX - CANVAS_WINDOW_OFFSET_LEFT;
|
||
const dx = x - lastX;
|
||
this.setState(state => ({ scrollX: state.scrollX - dx }));
|
||
lastX = x;
|
||
return;
|
||
}
|
||
|
||
if (isOverVerticalScrollBar) {
|
||
const y = e.clientY - CANVAS_WINDOW_OFFSET_TOP;
|
||
const dy = y - lastY;
|
||
this.setState(state => ({ scrollY: state.scrollY - dy }));
|
||
lastY = y;
|
||
return;
|
||
}
|
||
|
||
if (isResizingElements && this.state.resizingElement) {
|
||
const el = this.state.resizingElement;
|
||
const selectedElements = elements.filter(el => el.isSelected);
|
||
if (selectedElements.length === 1) {
|
||
const x =
|
||
e.clientX - CANVAS_WINDOW_OFFSET_LEFT - this.state.scrollX;
|
||
const y =
|
||
e.clientY - CANVAS_WINDOW_OFFSET_TOP - this.state.scrollY;
|
||
selectedElements.forEach(element => {
|
||
switch (resizeHandle) {
|
||
case "nw":
|
||
element.width += element.x - lastX;
|
||
element.height += element.y - lastY;
|
||
element.x = lastX;
|
||
element.y = lastY;
|
||
break;
|
||
case "ne":
|
||
element.width = lastX - element.x;
|
||
element.height += element.y - lastY;
|
||
element.y = lastY;
|
||
break;
|
||
case "sw":
|
||
element.width += element.x - lastX;
|
||
element.x = lastX;
|
||
element.height = lastY - element.y;
|
||
break;
|
||
case "se":
|
||
element.width += x - lastX;
|
||
if (e.shiftKey) {
|
||
element.height = element.width;
|
||
} else {
|
||
element.height += y - lastY;
|
||
}
|
||
break;
|
||
case "n":
|
||
element.height += element.y - lastY;
|
||
element.y = lastY;
|
||
break;
|
||
case "w":
|
||
element.width += element.x - lastX;
|
||
element.x = lastX;
|
||
break;
|
||
case "s":
|
||
element.height = lastY - element.y;
|
||
break;
|
||
case "e":
|
||
element.width = lastX - element.x;
|
||
break;
|
||
}
|
||
|
||
el.x = element.x;
|
||
el.y = element.y;
|
||
generateDraw(el);
|
||
});
|
||
lastX = x;
|
||
lastY = y;
|
||
// We don't want to save history when resizing an element
|
||
skipHistory = true;
|
||
this.forceUpdate();
|
||
return;
|
||
}
|
||
}
|
||
|
||
if (isDraggingElements) {
|
||
const selectedElements = elements.filter(el => el.isSelected);
|
||
if (selectedElements.length) {
|
||
const x =
|
||
e.clientX - CANVAS_WINDOW_OFFSET_LEFT - this.state.scrollX;
|
||
const y =
|
||
e.clientY - CANVAS_WINDOW_OFFSET_TOP - this.state.scrollY;
|
||
selectedElements.forEach(element => {
|
||
element.x += x - lastX;
|
||
element.y += y - lastY;
|
||
});
|
||
lastX = x;
|
||
lastY = y;
|
||
// We don't want to save history when dragging an element to initially size it
|
||
skipHistory = true;
|
||
this.forceUpdate();
|
||
return;
|
||
}
|
||
}
|
||
|
||
// It is very important to read this.state within each move event,
|
||
// otherwise we would read a stale one!
|
||
const draggingElement = this.state.draggingElement;
|
||
if (!draggingElement) return;
|
||
let width =
|
||
e.clientX -
|
||
CANVAS_WINDOW_OFFSET_LEFT -
|
||
draggingElement.x -
|
||
this.state.scrollX;
|
||
let height =
|
||
e.clientY -
|
||
CANVAS_WINDOW_OFFSET_TOP -
|
||
draggingElement.y -
|
||
this.state.scrollY;
|
||
draggingElement.width = width;
|
||
// Make a perfect square or circle when shift is enabled
|
||
draggingElement.height = e.shiftKey ? width : height;
|
||
|
||
generateDraw(draggingElement);
|
||
|
||
if (this.state.elementType === "selection") {
|
||
setSelection(draggingElement);
|
||
}
|
||
// We don't want to save history when moving an element
|
||
skipHistory = true;
|
||
this.forceUpdate();
|
||
};
|
||
|
||
const onMouseUp = (e: MouseEvent) => {
|
||
const { draggingElement, elementType } = this.state;
|
||
|
||
lastMouseUp = null;
|
||
window.removeEventListener("mousemove", onMouseMove);
|
||
window.removeEventListener("mouseup", onMouseUp);
|
||
|
||
resetCursor();
|
||
|
||
// if no element is clicked, clear the selection and redraw
|
||
if (draggingElement === null) {
|
||
clearSelection();
|
||
this.forceUpdate();
|
||
return;
|
||
}
|
||
|
||
if (elementType === "selection") {
|
||
if (isDraggingElements) {
|
||
isDraggingElements = false;
|
||
}
|
||
elements.pop();
|
||
} else {
|
||
draggingElement.isSelected = true;
|
||
}
|
||
|
||
this.setState({
|
||
draggingElement: null,
|
||
elementType: "selection"
|
||
});
|
||
this.forceUpdate();
|
||
};
|
||
|
||
lastMouseUp = onMouseUp;
|
||
|
||
window.addEventListener("mousemove", onMouseMove);
|
||
window.addEventListener("mouseup", onMouseUp);
|
||
|
||
// We don't want to save history on mouseDown, only on mouseUp when it's fully configured
|
||
skipHistory = true;
|
||
this.forceUpdate();
|
||
}}
|
||
/>
|
||
</div>
|
||
);
|
||
}
|
||
|
||
private handleWheel = (e: WheelEvent) => {
|
||
e.preventDefault();
|
||
const { deltaX, deltaY } = e;
|
||
this.setState(state => ({
|
||
scrollX: state.scrollX - deltaX,
|
||
scrollY: state.scrollY - deltaY
|
||
}));
|
||
};
|
||
|
||
componentDidUpdate() {
|
||
renderScene(rc, canvas, {
|
||
scrollX: this.state.scrollX,
|
||
scrollY: this.state.scrollY,
|
||
viewBackgroundColor: this.state.viewBackgroundColor
|
||
});
|
||
save(this.state);
|
||
if (!skipHistory) {
|
||
pushHistoryEntry(generateHistoryCurrentEntry());
|
||
}
|
||
skipHistory = false;
|
||
}
|
||
}
|
||
|
||
const rootElement = document.getElementById("root");
|
||
ReactDOM.render(<App />, rootElement);
|
||
const canvas = document.getElementById("canvas") as HTMLCanvasElement;
|
||
const rc = rough.canvas(canvas);
|
||
const context = canvas.getContext("2d")!;
|
||
|
||
ReactDOM.render(<App />, rootElement);
|