72 lines
1.7 KiB
TypeScript
72 lines
1.7 KiB
TypeScript
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class CanvasReceiverController {
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private canvasDiv: HTMLDivElement;
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private canvas!: HTMLCanvasElement;
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private ctx!: CanvasRenderingContext2D | null;
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private ws: WebSocket;
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constructor() {
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this.canvasDiv = document.querySelector('#canvas') as HTMLDivElement;
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this.createCanvas();
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this.ws = new WebSocket('ws://localhost:8081', 'json');
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this.ws.onmessage = message => this.processMessage(message);
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this.ws.onopen = () => this.ws.send("RECEIVER");
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}
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private createCanvas() {
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this.canvas = document.createElement('canvas');
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this.canvasDiv.appendChild(this.canvas);
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this.canvas.width = this.canvas.offsetWidth;
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this.canvas.height = this.canvas.offsetHeight;
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this.ctx = this.canvas.getContext('2d');
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}
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processMessage(message: MessageEvent<any>) {
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if (message.data === "CLEAR") {
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this.canvasDiv.removeChild(this.canvas);
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this.createCanvas();
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} else {
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this.draw(JSON.parse(message.data));
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}
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}
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draw(path: Coordinates[]) {
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if (!this.ctx) {
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return;
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}
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const first = path.shift();
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if (!first) {
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return;
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}
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this.ctx.beginPath();
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this.ctx.moveTo(first.x, first.y);
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for (const cur of path) {
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this.ctx.lineTo(cur.x, cur.y);
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}
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this.ctx.lineWidth = 1;
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this.ctx.stroke();
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}
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}
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class Coordinates {
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public x: number;
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public y: number;
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constructor(x: number, y: number) {
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this.x = x;
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this.y = y;
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}
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}
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const app = new CanvasReceiverController();
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export { app };
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