init commit

main
joak 10 months ago
commit 93d03e0441

2
.gitignore vendored

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node_modules/*
package-lock.json

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const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const { Server } = require("socket.io");
const io = new Server(server);
app.use(express.static('public'));
io.on('connection', (socket) => {
console.log('a user connected');
socket.on('draw', (line) => {
console.log(line);
socket.broadcast.emit("draw",line);
});
socket.on('disconnect', () => {
console.log('user disconnected');
});
});
server.listen(3000, () => {
console.log('listening on *:3000');
});

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{
"name": "collective drawing on canvas",
"version": "0.0.1",
"description": "lets draw together",
"dependencies": {
"express": "^4.18.2",
"socket.io": "^4.7.4"
}
}

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>untitled</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<style>
body{
margin: 0 auto;
}
#drawing{
display: block;
margin-top: 100px;
margin-right: auto;
margin-left: auto;
border: 1px solid #000;
box-shadow: 0px 0px 10px #000;
}
</style>
</head>
<body>
<canvas id="drawing" width="400" height="400" ></canvas>
Width:<input type="range" min="1" max="20" value="5" id="lineWidth">
Color:<input type="color" id="color" value="#000000" />
</body>
<script src="/socket.io/socket.io.js"></script>
<script>
var socket = io();
var canvas = document.getElementById("drawing");
var ctx = canvas.getContext('2d');
var pos = { x: 0, y: 0 };
var lineWidth = 5;
var color = "#000000";
document.addEventListener('mousemove', draw);
document.addEventListener('mousedown', setPosition);
document.addEventListener('mouseenter', setPosition);
function setPosition(e) {
pos.x = e.clientX - canvas.offsetLeft;
pos.y = e.clientY - canvas.offsetTop;
}
function draw(e) {
if (e.buttons !== 1) return;
ctx.beginPath();
ctx.lineWidth = lineWidth;
ctx.lineCap = 'round';
ctx.strokeStyle = color;
ctx.moveTo(pos.x, pos.y);
var oldpos = { x: pos.x, y: pos.y };
setPosition(e);
ctx.lineTo(pos.x, pos.y);
ctx.stroke();
socket.emit('draw', {oldpos, pos, lineWidth, color});
}
document.getElementById("lineWidth").addEventListener('change', function(){
lineWidth = this.value;
});
document.getElementById("color").addEventListener('change', function(){
color = this.value;
});
socket.on("draw", function(input){
ctx.lineWidth = input.lineWidth;
ctx.strokeStyle = input.color;
ctx.moveTo(input.oldpos.x, input.oldpos.y);
ctx.lineTo(input.pos.x, input.pos.y);
ctx.stroke();
});
</script>
</html>
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