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@@ -0,0 +1,581 @@
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+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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+
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+import "./styles.css";
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+
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+type ExcaliburElement = ReturnType<typeof newElement>;
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+type ExcaliburTextElement = ExcaliburElement & {
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+ type: "text";
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+ font: string;
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+ text: string;
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+ measure: TextMetrics;
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+};
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+
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+var elements = Array.of<ExcaliburElement>();
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+
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+function isInsideAnElement(x: number, y: number) {
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+ return (element: ExcaliburElement) => {
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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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+
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+ return x >= x1 && x <= x2 && y >= y1 && y <= y2;
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+ };
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+}
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+
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+function newElement(type: string, x: number, y: number, width = 0, height = 0) {
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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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+ draw(rc: RoughCanvas, context: CanvasRenderingContext2D) {}
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+ };
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+ return element;
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+}
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+
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+function exportAsPNG({
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+ exportBackground,
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+ exportVisibleOnly,
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+ exportPadding = 10
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+}: {
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+ exportBackground: boolean;
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+ exportVisibleOnly: boolean;
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+ exportPadding?: number;
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+}) {
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+ if (!elements.length) return window.alert("Cannot export empty canvas.");
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+
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+ // deselect & rerender
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+
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+ clearSelection();
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+ drawScene();
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+
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+ // calculate visible-area coords
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+
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+ let subCanvasX1 = Infinity;
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+ let subCanvasX2 = 0;
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+ let subCanvasY1 = Infinity;
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+ let subCanvasY2 = 0;
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+
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+ elements.forEach(element => {
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+ subCanvasX1 = Math.min(subCanvasX1, getElementAbsoluteX1(element));
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+ subCanvasX2 = Math.max(subCanvasX2, getElementAbsoluteX2(element));
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+ subCanvasY1 = Math.min(subCanvasY1, getElementAbsoluteY1(element));
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+ subCanvasY2 = Math.max(subCanvasY2, getElementAbsoluteY2(element));
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+ });
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+
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+ // create temporary canvas from which we'll export
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+
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+ const tempCanvas = document.createElement("canvas");
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+ const tempCanvasCtx = tempCanvas.getContext("2d")!;
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+ tempCanvas.style.display = "none";
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+ document.body.appendChild(tempCanvas);
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+ tempCanvas.width = exportVisibleOnly
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+ ? subCanvasX2 - subCanvasX1 + exportPadding * 2
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+ : canvas.width;
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+ tempCanvas.height = exportVisibleOnly
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+ ? subCanvasY2 - subCanvasY1 + exportPadding * 2
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+ : canvas.height;
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+
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+ if (exportBackground) {
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+ tempCanvasCtx.fillStyle = "#FFF";
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+ tempCanvasCtx.fillRect(0, 0, canvas.width, canvas.height);
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+ }
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+
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+ // copy our original canvas onto the temp canvas
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+ tempCanvasCtx.drawImage(
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+ canvas, // source
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+ exportVisibleOnly // sx
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+ ? subCanvasX1 - exportPadding
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+ : 0,
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+ exportVisibleOnly // sy
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+ ? subCanvasY1 - exportPadding
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+ : 0,
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+ exportVisibleOnly // sWidth
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+ ? subCanvasX2 - subCanvasX1 + exportPadding * 2
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+ : canvas.width,
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+ exportVisibleOnly // sHeight
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+ ? subCanvasY2 - subCanvasY1 + exportPadding * 2
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+ : canvas.height,
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+ 0, // dx
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+ 0, // dy
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+ exportVisibleOnly ? tempCanvas.width : canvas.width, // dWidth
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+ exportVisibleOnly ? tempCanvas.height : canvas.height // dHeight
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+ );
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+
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+ // create a temporary <a> elem which we'll use to download the image
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+ const link = document.createElement("a");
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+ link.setAttribute("download", "excalibur.png");
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+ link.setAttribute("href", tempCanvas.toDataURL("image/png"));
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+ link.click();
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+
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+ // clean up the DOM
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+ link.remove();
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+ if (tempCanvas !== canvas) tempCanvas.remove();
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+}
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+
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+function rotate(x1: number, y1: number, x2: number, y2: number, angle: number) {
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+ // 𝑎′𝑥=(𝑎𝑥−𝑐𝑥)cos𝜃−(𝑎𝑦−𝑐𝑦)sin𝜃+𝑐𝑥
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+ // 𝑎′𝑦=(𝑎𝑥−𝑐𝑥)sin𝜃+(𝑎𝑦−𝑐𝑦)cos𝜃+𝑐𝑦.
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+ // https://math.stackexchange.com/questions/2204520/how-do-i-rotate-a-line-segment-in-a-specific-point-on-the-line
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+ return [
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+ (x1 - x2) * Math.cos(angle) - (y1 - y2) * Math.sin(angle) + x2,
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+ (x1 - x2) * Math.sin(angle) + (y1 - y2) * Math.cos(angle) + y2
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+ ];
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+}
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+
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+// Casting second argument (DrawingSurface) to any,
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+// because it is requred by TS definitions and not required at runtime
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+var generator = rough.generator(null, null as any);
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+
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+function isTextElement(
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+ element: ExcaliburElement
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+): element is ExcaliburTextElement {
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+ return element.type === "text";
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+}
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+
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+function generateDraw(element: ExcaliburElement) {
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+ if (element.type === "selection") {
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+ element.draw = (rc, context) => {
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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(element.x, element.y, element.width, element.height);
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+ context.fillStyle = fillStyle;
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+ };
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+ } else if (element.type === "rectangle") {
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+ const shape = generator.rectangle(0, 0, element.width, element.height);
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+ element.draw = (rc, context) => {
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+ context.translate(element.x, element.y);
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+ rc.draw(shape);
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+ context.translate(-element.x, -element.y);
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+ };
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+ } else if (element.type === "ellipse") {
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+ const 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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+ element.draw = (rc, context) => {
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+ context.translate(element.x, element.y);
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+ rc.draw(shape);
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+ context.translate(-element.x, -element.y);
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+ };
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+ } else if (element.type === "arrow") {
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+ const x1 = 0;
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+ const y1 = 0;
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+ const x2 = element.width;
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+ const y2 = element.height;
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+
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+ const size = 30; // pixels
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+ const distance = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
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+ // Scale down the arrow until we hit a certain size so that it doesn't look weird
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+ const minSize = Math.min(size, distance / 2);
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+ const xs = x2 - ((x2 - x1) / distance) * minSize;
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+ const ys = y2 - ((y2 - y1) / distance) * minSize;
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+
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+ const angle = 20; // degrees
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+ const [x3, y3] = rotate(xs, ys, x2, y2, (-angle * Math.PI) / 180);
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+ const [x4, y4] = rotate(xs, ys, x2, y2, (angle * Math.PI) / 180);
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+
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+ const shapes = [
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+ // \
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+ generator.line(x3, y3, x2, y2),
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+ // -----
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+ generator.line(x1, y1, x2, y2),
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+ // /
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+ generator.line(x4, y4, x2, y2)
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+ ];
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+
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+ element.draw = (rc, context) => {
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+ context.translate(element.x, element.y);
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+ shapes.forEach(shape => rc.draw(shape));
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+ context.translate(-element.x, -element.y);
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+ };
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+ return;
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+ } else if (isTextElement(element)) {
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+ element.draw = (rc, context) => {
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+ const font = context.font;
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+ context.font = element.font;
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+ context.fillText(
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+ element.text,
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+ element.x,
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+ element.y + element.measure.actualBoundingBoxAscent
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+ );
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+ context.font = font;
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+ };
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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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+// If the element is created from right to left, the width is going to be negative
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+// This set of functions retrieves the absolute position of the 4 points.
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+// We can't just always normalize it since we need to remember the fact that an arrow
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+// is pointing left or right.
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+function getElementAbsoluteX1(element: ExcaliburElement) {
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+ return element.width >= 0 ? element.x : element.x + element.width;
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+}
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+function getElementAbsoluteX2(element: ExcaliburElement) {
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+ return element.width >= 0 ? element.x + element.width : element.x;
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+}
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+function getElementAbsoluteY1(element: ExcaliburElement) {
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+ return element.height >= 0 ? element.y : element.y + element.height;
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+}
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+function getElementAbsoluteY2(element: ExcaliburElement) {
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+ return element.height >= 0 ? element.y + element.height : element.y;
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+}
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+
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+function setSelection(selection: ExcaliburElement) {
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+ const selectionX1 = getElementAbsoluteX1(selection);
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+ const selectionX2 = getElementAbsoluteX2(selection);
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+ const selectionY1 = getElementAbsoluteY1(selection);
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+ const selectionY2 = getElementAbsoluteY2(selection);
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+ elements.forEach(element => {
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+ const elementX1 = getElementAbsoluteX1(element);
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+ const elementX2 = getElementAbsoluteX2(element);
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+ const elementY1 = getElementAbsoluteY1(element);
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+ const elementY2 = getElementAbsoluteY2(element);
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+ element.isSelected =
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+ element.type !== "selection" &&
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+ selectionX1 <= elementX1 &&
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+ selectionY1 <= elementY1 &&
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+ selectionX2 >= elementX2 &&
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+ selectionY2 >= elementY2;
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+ });
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+}
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+
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+function clearSelection() {
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+ elements.forEach(element => {
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+ element.isSelected = false;
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+ });
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+}
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+
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+type AppState = {
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+ draggingElement: ExcaliburElement | null;
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+ elementType: string;
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+ exportBackground: boolean;
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+ exportVisibleOnly: boolean;
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+ exportPadding: number;
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+};
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+
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+class App extends React.Component<{}, AppState> {
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+ public componentDidMount() {
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+ document.addEventListener("keydown", this.onKeyDown, false);
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+ }
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+
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+ public componentWillUnmount() {
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+ document.removeEventListener("keydown", this.onKeyDown, false);
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+ }
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+
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+ public state: AppState = {
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+ draggingElement: null,
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+ elementType: "selection",
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+ exportBackground: false,
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+ exportVisibleOnly: true,
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+ exportPadding: 10
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+ };
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+
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+ private onKeyDown = (event: KeyboardEvent) => {
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+ if (
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+ event.key === "Backspace" &&
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+ (event.target as HTMLElement)?.nodeName !== "INPUT"
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+ ) {
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+ for (var i = elements.length - 1; i >= 0; --i) {
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+ if (elements[i].isSelected) {
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+ elements.splice(i, 1);
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+ }
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+ }
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+ drawScene();
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+ event.preventDefault();
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+ } else if (
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+ event.key === "ArrowLeft" ||
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+ event.key === "ArrowRight" ||
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+ event.key === "ArrowUp" ||
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+ event.key === "ArrowDown"
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+ ) {
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+ const step = event.shiftKey ? 5 : 1;
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+ elements.forEach(element => {
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+ if (element.isSelected) {
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+ if (event.key === "ArrowLeft") element.x -= step;
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+ else if (event.key === "ArrowRight") element.x += step;
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+ else if (event.key === "ArrowUp") element.y -= step;
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+ else if (event.key === "ArrowDown") element.y += step;
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+ }
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+ });
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+ drawScene();
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+ event.preventDefault();
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+ }
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+ };
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+
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+ private renderOption({
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+ type,
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+ children
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+ }: {
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+ type: string;
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+ children: React.ReactNode;
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+ }) {
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+ return (
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+ <label>
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+ <input
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+ type="radio"
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+ checked={this.state.elementType === type}
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+ onChange={() => {
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+ this.setState({ elementType: type });
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+ clearSelection();
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+ drawScene();
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+ }}
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+ />
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+ {children}
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+ </label>
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+ );
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+ }
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+
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+ public render() {
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+ return (
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+ <>
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+ <div className="exportWrapper">
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+ <button
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+ onClick={() => {
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+ exportAsPNG({
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+ exportBackground: this.state.exportBackground,
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+ exportVisibleOnly: this.state.exportVisibleOnly,
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+ exportPadding: this.state.exportPadding
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+ });
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+ }}
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+ >
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+ Export to png
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+ </button>
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+ <label>
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+ <input
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+ type="checkbox"
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+ checked={this.state.exportBackground}
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+ onChange={e => {
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+ this.setState({ exportBackground: e.target.checked });
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+ }}
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+ />{" "}
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+ background
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+ </label>
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+ <label>
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+ <input
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+ type="checkbox"
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+ checked={this.state.exportVisibleOnly}
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+ onChange={e => {
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+ this.setState({ exportVisibleOnly: e.target.checked });
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+ }}
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+ />
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+ visible area only
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+ </label>
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+ (padding:
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+ <input
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+ type="number"
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+ value={this.state.exportPadding}
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+ onChange={e => {
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+ this.setState({ exportPadding: Number(e.target.value) });
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+ }}
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+ disabled={!this.state.exportVisibleOnly}
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+ />
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+ px)
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+ </div>
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+ <div>
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+ {this.renderOption({ type: "rectangle", children: "Rectangle" })}
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+ {this.renderOption({ type: "ellipse", children: "Ellipse" })}
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+ {this.renderOption({ type: "arrow", children: "Arrow" })}
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+ {this.renderOption({ type: "text", children: "Text" })}
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+ {this.renderOption({ type: "selection", children: "Selection" })}
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+ <canvas
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+ id="canvas"
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+ width={window.innerWidth}
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+ height={window.innerHeight}
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+ onMouseDown={e => {
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+ const x = e.clientX - (e.target as HTMLElement).offsetLeft;
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+ const y = e.clientY - (e.target as HTMLElement).offsetTop;
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+ const element = newElement(this.state.elementType, x, y);
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+ let isDraggingElements = false;
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+ const cursorStyle = document.documentElement.style.cursor;
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+ if (this.state.elementType === "selection") {
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+ const selectedElement = elements.find(element => {
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+ const isSelected = isInsideAnElement(x, y)(element);
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+ if (isSelected) {
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+ element.isSelected = true;
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+ }
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+ return isSelected;
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+ });
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+
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+ if (selectedElement) {
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+ this.setState({ draggingElement: selectedElement });
|
|
|
+ } else {
|
|
|
+ clearSelection();
|
|
|
+ }
|
|
|
+
|
|
|
+ isDraggingElements = elements.some(
|
|
|
+ element => element.isSelected
|
|
|
+ );
|
|
|
+
|
|
|
+ if (isDraggingElements) {
|
|
|
+ document.documentElement.style.cursor = "move";
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (isTextElement(element)) {
|
|
|
+ const text = prompt("What text do you want?");
|
|
|
+ if (text === null) {
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ element.text = text;
|
|
|
+ element.font = "20px Virgil";
|
|
|
+ const font = context.font;
|
|
|
+ context.font = element.font;
|
|
|
+ element.measure = context.measureText(element.text);
|
|
|
+ context.font = font;
|
|
|
+ const height =
|
|
|
+ element.measure.actualBoundingBoxAscent +
|
|
|
+ element.measure.actualBoundingBoxDescent;
|
|
|
+ // Center the text
|
|
|
+ element.x -= element.measure.width / 2;
|
|
|
+ element.y -= element.measure.actualBoundingBoxAscent;
|
|
|
+ element.width = element.measure.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;
|
|
|
+
|
|
|
+ const onMouseMove = (e: MouseEvent) => {
|
|
|
+ const target = e.target;
|
|
|
+ if (!(target instanceof HTMLElement)) {
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (isDraggingElements) {
|
|
|
+ const selectedElements = elements.filter(el => el.isSelected);
|
|
|
+ if (selectedElements.length) {
|
|
|
+ const x = e.clientX - target.offsetLeft;
|
|
|
+ const y = e.clientY - target.offsetTop;
|
|
|
+ selectedElements.forEach(element => {
|
|
|
+ element.x += x - lastX;
|
|
|
+ element.y += y - lastY;
|
|
|
+ });
|
|
|
+ lastX = x;
|
|
|
+ lastY = y;
|
|
|
+ drawScene();
|
|
|
+ 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 - target.offsetLeft - draggingElement.x;
|
|
|
+ let height = e.clientY - target.offsetTop - draggingElement.y;
|
|
|
+ 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);
|
|
|
+ }
|
|
|
+ drawScene();
|
|
|
+ };
|
|
|
+
|
|
|
+ const onMouseUp = (e: MouseEvent) => {
|
|
|
+ const { draggingElement, elementType } = this.state;
|
|
|
+
|
|
|
+ window.removeEventListener("mousemove", onMouseMove);
|
|
|
+ window.removeEventListener("mouseup", onMouseUp);
|
|
|
+
|
|
|
+ document.documentElement.style.cursor = cursorStyle;
|
|
|
+
|
|
|
+ // if no element is clicked, clear the selection and redraw
|
|
|
+ if (draggingElement === null) {
|
|
|
+ clearSelection();
|
|
|
+ drawScene();
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (elementType === "selection") {
|
|
|
+ if (isDraggingElements) {
|
|
|
+ isDraggingElements = false;
|
|
|
+ }
|
|
|
+ elements.pop();
|
|
|
+ } else {
|
|
|
+ draggingElement.isSelected = true;
|
|
|
+ }
|
|
|
+
|
|
|
+ this.setState({
|
|
|
+ draggingElement: null,
|
|
|
+ elementType: "selection"
|
|
|
+ });
|
|
|
+ drawScene();
|
|
|
+ };
|
|
|
+
|
|
|
+ window.addEventListener("mousemove", onMouseMove);
|
|
|
+ window.addEventListener("mouseup", onMouseUp);
|
|
|
+
|
|
|
+ drawScene();
|
|
|
+ }}
|
|
|
+ />
|
|
|
+ </div>
|
|
|
+ </>
|
|
|
+ );
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+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")!;
|
|
|
+
|
|
|
+// Big hack to ensure that all the 1px lines are drawn at 1px instead of 2px
|
|
|
+// https://stackoverflow.com/questions/13879322/drawing-a-1px-thick-line-in-canvas-creates-a-2px-thick-line/13879402#comment90766599_13879402
|
|
|
+context.translate(0.5, 0.5);
|
|
|
+
|
|
|
+function drawScene() {
|
|
|
+ ReactDOM.render(<App />, rootElement);
|
|
|
+
|
|
|
+ context.clearRect(-0.5, -0.5, canvas.width, canvas.height);
|
|
|
+
|
|
|
+ elements.forEach(element => {
|
|
|
+ element.draw(rc, context);
|
|
|
+ if (element.isSelected) {
|
|
|
+ const margin = 4;
|
|
|
+
|
|
|
+ const elementX1 = getElementAbsoluteX1(element);
|
|
|
+ const elementX2 = getElementAbsoluteX2(element);
|
|
|
+ const elementY1 = getElementAbsoluteY1(element);
|
|
|
+ const elementY2 = getElementAbsoluteY2(element);
|
|
|
+ const lineDash = context.getLineDash();
|
|
|
+ context.setLineDash([8, 4]);
|
|
|
+ context.strokeRect(
|
|
|
+ elementX1 - margin,
|
|
|
+ elementY1 - margin,
|
|
|
+ elementX2 - elementX1 + margin * 2,
|
|
|
+ elementY2 - elementY1 + margin * 2
|
|
|
+ );
|
|
|
+ context.setLineDash(lineDash);
|
|
|
+ }
|
|
|
+ });
|
|
|
+}
|
|
|
+
|
|
|
+drawScene();
|
Timur Khazamov