fullscreen drawing
This commit is contained in:
JurajKubrican
committed by
Juraj Kubrican
Juraj Kubrican
parent
0505964854
commit
7ed413648c
194
js/draw.js
194
js/draw.js
@@ -1,101 +1,101 @@
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"use strict";
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(() => {
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const canvas = document.getElementById("drawCanvas");
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const ctx = canvas.getContext("2d");
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ctx.lineWidth = 2;
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ctx.lineCap = "round";
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ctx.strokeStyle = "white";
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let drawing = false;
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let lineId = 0;
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const socketUrl =
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(window.location.protocol.startsWith("https") ? "wss://" : "ws://") +
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window.location.host +
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"/draw/ws";
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let socket = new WebSocket(socketUrl);
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socket.onerror = console.error;
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socket.onclose = console.warn;
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setTimeout(() => socket.send("ping"), 200);
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// const queue = []
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const sendMessage = (id, x, y) => {
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// queue.push(`${id},${x},${y}`)
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// console.log(queue)
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if (socket.readyState !== socket.OPEN) {
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socket = new WebSocket(socketUrl);
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const drawElement = document.getElementById("drawDiv");
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if (!drawElement) {
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throw new Error("canvas not found");
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}
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socket.send(id + "," + x + "," + y);
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};
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const drawStart = () => {
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ctx.beginPath();
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lineId++;
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drawing = true;
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};
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const drawStop = () => {
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drawing = false;
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ctx.closePath();
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};
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const drawMove = (e) => {
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if (!drawing) return;
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ctx.lineTo(e.offsetX, e.offsetY);
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sendMessage(lineId, e.offsetX, e.offsetY);
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ctx.stroke();
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};
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const touchStart = (e) => drawStart(e.touches[0]);
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const touchMove = (e) => {
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drawMove({
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offsetX: e.touches[0].clientX - canvas.offsetLeft,
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offsetY: e.touches[0].clientY - canvas.offsetTop,
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const drawEmitter = mitt();
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let drawing = false;
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const socketUrl = "/draw/ws";
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let socket = new WebSocket(socketUrl);
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socket.onerror = console.error;
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socket.onclose = console.warn;
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const serializeDraw = ({ from, to }) => `${from.x},${from.y},${to.x},${to.y}`;
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const deserializeDraw = (message) => {
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const parts = message.split(",");
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return {
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from: {
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x: Number(parts[0]),
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y: Number(parts[1]),
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},
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to: {
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x: Number(parts[2]),
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y: Number(parts[3]),
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},
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};
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};
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drawEmitter.on("draw", (e) => sendMessage(e));
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const sendMessage = (e) => {
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if (socket.readyState !== socket.OPEN) {
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socket = new WebSocket(socketUrl);
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}
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socket.send(serializeDraw(e));
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};
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const mouseDown = () => {
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drawing = true;
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previous = null;
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};
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const mouseUp = () => {
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drawing = false;
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};
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let previous = null;
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const mouseMove = (e) => {
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if (!drawing)
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return;
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if (previous) {
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drawEmitter.emit("draw", {
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from: previous,
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to: { x: e.offsetX, y: e.offsetY },
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});
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}
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previous = { x: e.offsetX, y: e.offsetY };
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};
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const touchMove = (e) => {
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e.preventDefault();
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mouseMove({
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offsetX: e.touches[0].clientX - drawElement.offsetLeft,
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offsetY: e.touches[0].clientY - drawElement.offsetTop,
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});
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};
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drawElement.addEventListener("mousedown", mouseDown);
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drawElement.addEventListener("mouseup", mouseUp);
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drawElement.addEventListener("mousemove", mouseMove);
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drawElement.addEventListener("touchstart", mouseDown);
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drawElement.addEventListener("touchend", mouseUp);
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drawElement.addEventListener("touchmove", touchMove);
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const receiveCanvas = document.getElementById("receiveCanvas");
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const recCtx = receiveCanvas?.getContext("2d");
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if (!recCtx || !receiveCanvas) {
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throw new Error("canvas not found");
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}
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//@ts-expect-error
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window.ctx = recCtx;
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setTimeout(() => {
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recCtx.lineWidth = 2;
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recCtx.lineCap = "round";
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recCtx.strokeStyle = "white";
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}, 10);
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socket.addEventListener("message", (event) => {
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if (event.data === "ping" || event.data.startsWith('pong'))
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return;
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const { from, to } = deserializeDraw(event.data);
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recCtx.beginPath();
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recCtx.moveTo(from.x, from.y);
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recCtx.lineTo(to.x, to.y);
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recCtx.closePath();
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recCtx.stroke();
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console.log(from, to);
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});
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e.preventDefault();
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};
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const touchEnd = (e) => drawStop(e.changedTouches[0]);
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canvas.addEventListener("mousedown", drawStart);
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canvas.addEventListener("mouseup", drawStop);
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canvas.addEventListener("mousemove", drawMove);
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canvas.addEventListener("touchstart", touchStart);
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canvas.addEventListener("touchend", touchEnd);
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canvas.addEventListener("touchmove", touchMove);
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const receiveCanvas = document.getElementById("receiveCanvas");
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const recCtx = receiveCanvas.getContext("2d");
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recCtx.lineWidth = 2;
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recCtx.lineCap = "round";
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recCtx.strokeStyle = "white";
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let receiveLineId = 0;
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socket.addEventListener("message", function (event) {
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const parts = event.data.split(",");
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if (parts[0] != receiveLineId) {
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recCtx.closePath();
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recCtx.beginPath();
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receiveLineId = parts[0];
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recCtx.moveTo(parts[1], parts[2]);
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} else {
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recCtx.lineTo(parts[1], parts[2]);
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recCtx.stroke();
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}
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});
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setInterval(() => {
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if (socket.readyState !== socket.OPEN) {
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socket = new WebSocket(socketUrl);
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}
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socket.send("ping");
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}, 10000);
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setInterval(() => {
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if (socket.readyState !== socket.OPEN) {
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socket = new WebSocket(socketUrl);
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}
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socket.send("ping");
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}, 10000);
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const resizeObserver = new ResizeObserver((entries) => {
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const entry = entries.at(0);
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receiveCanvas.height = entry?.contentRect.height ?? 500;
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receiveCanvas.width = entry?.contentRect.width ?? 500;
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});
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resizeObserver.observe(drawElement);
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})();
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138
js/draw.ts
Normal file
138
js/draw.ts
Normal file
@@ -0,0 +1,138 @@
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(() => {
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const drawElement = document.getElementById(
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"drawDiv"
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) as HTMLDivElement | null;
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if (!drawElement) {
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throw new Error("canvas not found");
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}
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type DrawPoint = {
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x: number;
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y: number;
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};
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type DrawEvent = {
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from: DrawPoint;
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to: DrawPoint;
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};
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type Events = {
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draw: DrawEvent;
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};
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const drawEmitter = mitt<Events>();
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let drawing = false;
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const socketUrl = "/draw/ws";
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let socket = new WebSocket(socketUrl);
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socket.onerror = console.error;
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socket.onclose = console.warn;
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const serializeDraw = ({from, to }: DrawEvent) =>
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`${from.x},${from.y},${to.x},${to.y}`;
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const deserializeDraw = (message: string): DrawEvent => {
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const parts = message.split(",");
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return {
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from: {
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x: Number(parts[0]),
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y: Number(parts[1]),
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},
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to: {
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x: Number(parts[2]),
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y: Number(parts[3]),
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},
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};
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};
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drawEmitter.on("draw", (e) => sendMessage(e));
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const sendMessage = (e: DrawEvent) => {
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if (socket.readyState !== socket.OPEN) {
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socket = new WebSocket(socketUrl);
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}
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socket.send(serializeDraw(e));
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};
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const mouseDown = () => {
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drawing = true;
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previous=null
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};
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const mouseUp = () => {
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drawing = false;
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};
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let previous: DrawPoint | null = null;
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const mouseMove = (e: Pick<MouseEvent, "offsetX" | "offsetY">) => {
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if (!drawing) return;
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if (previous) {
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drawEmitter.emit("draw", {
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from: previous,
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to: { x: e.offsetX, y: e.offsetY },
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});
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}
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previous = { x: e.offsetX, y: e.offsetY };
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};
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const touchMove = (e: TouchEvent) => {
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e.preventDefault();
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mouseMove({
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offsetX: e.touches[0].clientX - drawElement.offsetLeft,
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offsetY: e.touches[0].clientY - drawElement.offsetTop,
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});
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};
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drawElement.addEventListener("mousedown", mouseDown);
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drawElement.addEventListener("mouseup", mouseUp);
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drawElement.addEventListener("mousemove", mouseMove);
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drawElement.addEventListener("touchstart", mouseDown);
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drawElement.addEventListener("touchend", mouseUp);
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drawElement.addEventListener("touchmove", touchMove);
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const receiveCanvas = document.getElementById(
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"receiveCanvas"
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) as HTMLCanvasElement | null;
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const recCtx = receiveCanvas?.getContext("2d");
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if (!recCtx || !receiveCanvas) {
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throw new Error("canvas not found");
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}
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//@ts-expect-error
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window.ctx = recCtx;
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setTimeout(()=>{
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recCtx.lineWidth = 2;
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recCtx.lineCap = "round";
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recCtx.strokeStyle = "white";
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},10)
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socket.addEventListener("message", (event) => {
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if(event.data==="ping" || event.data.startsWith('pong')) return
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const { from, to } = deserializeDraw(event.data);
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recCtx.beginPath();
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recCtx.moveTo(from.x, from.y);
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recCtx.lineTo(to.x, to.y);
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recCtx.closePath();
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recCtx.stroke();
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console.log(from, to);
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});
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setInterval(() => {
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if (socket.readyState !== socket.OPEN) {
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socket = new WebSocket(socketUrl);
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}
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socket.send("ping");
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}, 10000);
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const resizeObserver = new ResizeObserver((entries) => {
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const entry = entries.at(0);
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receiveCanvas.height = entry?.contentRect.height ?? 500;
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receiveCanvas.width = entry?.contentRect.width ?? 500;
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});
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resizeObserver.observe(drawElement);
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})();
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4
js/global.d.ts
vendored
Normal file
4
js/global.d.ts
vendored
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@@ -0,0 +1,4 @@
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declare const mitt: {
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//@ts-expect-error
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<T = any>(): import("mitt").Emitter<T>;
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};
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2
js/mitt/mitt.js
Normal file
2
js/mitt/mitt.js
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@@ -0,0 +1,2 @@
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function mitt (n){return{all:n=n||new Map,on:function(e,t){var i=n.get(e);i?i.push(t):n.set(e,[t])},off:function(e,t){var i=n.get(e);i&&(t?i.splice(i.indexOf(t)>>>0,1):n.set(e,[]))},emit:function(e,t){var i=n.get(e);i&&i.slice().map(function(n){n(t)}),(i=n.get("*"))&&i.slice().map(function(n){n(e,t)})}}};
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//# sourceMappingURL=mitt.js.map
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