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"sha1-AI4G2AlDIMNy28L47XagymyKxBk=" + } + } +} diff --git a/package.json b/package.json new file mode 100644 index 0000000..052230a --- /dev/null +++ b/package.json @@ -0,0 +1,10 @@ +{ + "name": "socket-chat-example", + "version": "0.0.1", + "description": "my first socket.io app", + "dependencies": { + "color-convert": "^1.9.3", + "express": "^4.16.4", + "socket.io": "^2.1.1" + } +} diff --git a/server.js b/server.js new file mode 100644 index 0000000..80703f2 --- /dev/null +++ b/server.js @@ -0,0 +1,184 @@ +const app = require('express')(); +const http = require('http').Server(app); +const io = require('socket.io')(http); +const convert = require('color-convert'); + +app.get('/', function (req, res) { + res.sendFile(__dirname + '/client.html'); +}); + +function randomColor() { + return '#' + convert.hsl.hex([randInt(0, 256), randInt(50, 200), 256]); +} + +function randInt(min, max) { + return Math.floor(min + Math.random() * (max - min)); +} + +function intersects(a1, a2, b1, b2) { + let det, gamma, lambda; + det = (a2.x - a1.x) * (b2.y - b1.y) - (b2.x - b1.x) * (a2.y - a1.y); + if (det === 0) { + return false; + } else { + lambda = ((b2.y - b1.y) * (b2.x - a1.x) + (b1.x - b2.x) * (b2.y - a1.y)) / det; + gamma = ((a1.y - a2.y) * (b2.x - a1.x) + (a2.x - a1.x) * (b2.y - a1.y)) / det; + return (0 < lambda && lambda < 1) && (0 < gamma && gamma < 1); + } +} + +function dist(a1,a2){ + return Math.sqrt(Math.pow(a1.x-a2.x,2)+Math.pow(a1.y-a2.y,2)); +} + +function clone(a){ + return {x:parseFloat(a.x),y:parseFloat(a.y)}; +} + +const HSIZE = 300; +const MAXX = 1600; +const MAXY = 900; +const SPD = 5; +const MAX_ANGLE_SPEED = Math.PI / 32; + +const players = {}; +const history = {}; + +let upc = 0; +let ic = 0; + +setInterval(function () { + //main loop + Object.keys(players).forEach(function (name) { + const p = players[name]; + if (p.alive) { + const lastpos = clone(p.pos); + p.pos.x += SPD * Math.cos(p.angle); + p.pos.y += SPD * Math.sin(p.angle); + p.angle += p.angleSpd; + let exempt = false; + if (p.pos.x > MAXX){ + p.pos.x = 0; + exempt = true; + } + if (p.pos.x < 0){ + p.pos.x = MAXX; + exempt = true; + } + if (p.pos.y > MAXY){ + p.pos.y = 0; + exempt = true; + } + if (p.pos.y < 0){ + p.pos.y = MAXY; + exempt = true; + } + + if(p.starting <= 0){ + const h = history[name]; + h.i0 = (h.i0 + 1) % HSIZE; + h.list[h.i0] = clone(p.pos); + } + + if(!exempt && p.starting <= 0){ + const ds = dist(lastpos,p.pos); + if(ds <= SPD*0.9) + process.stdout.write(`\r${name} moved too slowly : ${ds} [${lastpos.x},${lastpos.y}]->[${p.pos.x},${p.pos.y}]\n`); + if(ds >= SPD*1.1) + process.stdout.write(`\r${name} moved too quickly : ${ds} [${lastpos.x},${lastpos.y}]->[${p.pos.x},${p.pos.y}]\n`); + + Object.keys(history).forEach(function (name2) { + if (p.alive && name !== name2) { + const h2 = history[name2]; + let lastpoint = h2.list[h2.i0]; + if(!lastpoint) + return; + for (let di = 1; di < HSIZE; di++) { + const point = h2.list[(h2.i0 - di + HSIZE) % HSIZE]; + if (point !== undefined) { + if(Math.abs(lastpoint.x - point.x) < 1600 * .9 && Math.abs(lastpoint.y - point.y) < 900 * .9){ + ic++; + if (intersects(lastpos, p.pos, lastpoint, point)) { + process.stdout.write(`\r${name} collided with ${name2}\n`); + p.alive = false; + break; + } + } + lastpoint = point; + } else { + break; + } + } + } + }); + } + + if(p.starting > 0) + p.starting -= 20; + + } + }); + io.emit('players', players); + upc++; +}, 20); + +setInterval(function () { + process.stdout.write(`\rtick ${20 * upc * 20 / 1000}/20 ms (${ic} intersect/s)`); + upc = 0; + ic = 0; +}, 1000); + +io.on('connection', function (socket) { + socket.name = '#' + ('0000' + randInt(0, 10000)).slice(-4); + process.stdout.write(`\r${socket.name} connected\n`); + players[socket.name] = { + pos: { + x: randInt(100, MAXX - 100), + y: randInt(100, MAXY - 100) + }, + angle: Math.random() * Math.PI, + angleSpd: 0, + color: randomColor(), + name: socket.name, + alive: true, + starting: 2000 + }; + history[socket.name] = { + i0: -1, + list: new Array(HSIZE) + }; + socket.emit('info', { + self:players[socket.name], + players:players, + history:history, + hsize:HSIZE + }); + + socket.on('disconnect', function () { + delete players[socket.name]; + delete history[socket.name]; + process.stdout.write(`\r${socket.name} disconnected\n`); + io.emit('players', players); + }); + socket.on('update', function (newp) { + const p = players[newp.name]; + if (!p) { + socket.disconnect(); + return; + } + if (!p.alive) + return; + if (newp.color === 'new') + players[newp.name].color = randomColor(); + if (newp.angleSpd > 0) + players[newp.name].angleSpd = MAX_ANGLE_SPEED; + else if (newp.angleSpd < 0) + players[newp.name].angleSpd = -MAX_ANGLE_SPEED; + else + players[newp.name].angleSpd = 0; + }); +}); + +http.listen(3001, function () { + console.log('listening on *:3001\n'); +}); \ No newline at end of file