├── .gitignore ├── README.md ├── package.json ├── public ├── Detector.js ├── MathEx.js ├── RequestAnimationFrame.js ├── Stats.js ├── Three.js ├── app.js ├── index.html ├── jq.js ├── particle.png ├── requestanimframe.js └── smoothener.js └── server.js /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # shared-particles # 2 | 3 | Uses the following awesome node.js / javascript libraries: 4 | 5 | - [express](http://expressjs.org) 6 | - [socket.io](http://socket.io) 7 | - [three.js](http://github.com/mrdoob/three.js) 8 | 9 | And does its best to make a fun example of what's possible with that stack on modern browsers. 10 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "author": "Einar Otto Stangvik ", 3 | "name": "shared-particles", 4 | "version": "0.0.2", 5 | "homepage": "http://wire.2x.io", 6 | "repository": { 7 | "type": "git", 8 | "url": "git://github.com/einaros/shared-particles.git" 9 | }, 10 | "engines": { 11 | "node": ">v0.4.0" 12 | }, 13 | "dependencies": { 14 | "express": "latest", 15 | "socket.io": "latest" 16 | }, 17 | "devDependencies": {} 18 | } 19 | -------------------------------------------------------------------------------- /public/Detector.js: -------------------------------------------------------------------------------- 1 | /** 2 | * @author alteredq / http://alteredqualia.com/ 3 | * @author mr.doob / http://mrdoob.com/ 4 | */ 5 | 6 | Detector = { 7 | 8 | canvas : !! window.CanvasRenderingContext2D, 9 | webgl : ( function () { try { return !! window.WebGLRenderingContext && !! document.createElement( 'canvas' ).getContext( 'experimental-webgl' ); } catch( e ) { return false; } } )(), 10 | workers : !! window.Worker, 11 | fileapi : window.File && window.FileReader && window.FileList && window.Blob, 12 | 13 | getWebGLErrorMessage : function () { 14 | 15 | var domElement = document.createElement( 'div' ); 16 | 17 | domElement.style.fontFamily = 'monospace'; 18 | domElement.style.fontSize = '13px'; 19 | domElement.style.textAlign = 'center'; 20 | domElement.style.background = '#eee'; 21 | domElement.style.color = '#000'; 22 | domElement.style.padding = '1em'; 23 | domElement.style.width = '475px'; 24 | domElement.style.margin = '5em auto 0'; 25 | 26 | if ( ! this.webgl ) { 27 | 28 | domElement.innerHTML = window.WebGLRenderingContext ? [ 29 | 'Your graphics card does not seem to support WebGL.
', 30 | 'Find out how to get it here.' 31 | ].join( '\n' ) : [ 32 | 'Your browser does not seem to support WebGL.
', 33 | 'Find out how to get it here.' 34 | ].join( '\n' ); 35 | 36 | } 37 | 38 | return domElement; 39 | 40 | }, 41 | 42 | addGetWebGLMessage : function ( parameters ) { 43 | 44 | var parent, id, domElement; 45 | 46 | parameters = parameters || {}; 47 | 48 | parent = parameters.parent !== undefined ? parameters.parent : document.body; 49 | id = parameters.id !== undefined ? parameters.id : 'oldie'; 50 | 51 | domElement = Detector.getWebGLErrorMessage(); 52 | domElement.id = id; 53 | 54 | parent.appendChild( domElement ); 55 | 56 | } 57 | 58 | }; 59 | -------------------------------------------------------------------------------- /public/MathEx.js: -------------------------------------------------------------------------------- 1 | (function(exports) { 2 | exports.MathEx = { 3 | roundTo: function(n, precision) { 4 | p=Math.pow(10, precision); 5 | return ~~(n*p)/p; 6 | }, 7 | distance: function(x0, y0, x1, y1) { 8 | return Math.sqrt(Math.pow(x1 - x0, 2) + Math.pow(y1 - y0, 2)); 9 | }, 10 | distanceArray: function(pointArray) { 11 | if (pointArray.length < 2) return 0; 12 | var d = 0; 13 | for (var i = 0; i < pointArray.length - 1; ++i) { 14 | d += MathEx.distance(pointArray[i].x, pointArray[i].y, 15 | pointArray[i + 1].x, pointArray[i + 1].y); 16 | } 17 | return d; 18 | }, 19 | bounded: function(n, min, max) { 20 | return Math.min(max, Math.max(min, n)); 21 | }, 22 | random: function(min, max) { 23 | return Math.random() * (max - min) + min; 24 | }, 25 | Interpolate: { 26 | cubic: function(y0, y1, y2, y3, mu) { 27 | var a0,a1,a2,a3,mu2; 28 | mu2 = mu * mu; 29 | a0 = -0.5*y0 + 1.5*y1 - 1.5*y2 + 0.5*y3; 30 | a1 = y0 - 2.5*y1 + 2*y2 - 0.5*y3; 31 | a2 = -0.5*y0 + 0.5*y2; 32 | a3 = y1; 33 | return a0*mu*mu2+a1*mu2+a2*mu+a3; 34 | }, 35 | hermite1d: function(y0, y1, y2, y3, mu, tension, bias) { 36 | var m0, m1, mu2, mu3, a0, a1, a2, a3; 37 | mu2 = mu*mu; 38 | mu3 = mu2*mu; 39 | m0 = (y1 - y0)*(1 + bias)*(1 - tension)/2; 40 | m0 += (y2 - y1)*(1 - bias)*(1 - tension)/2; 41 | m1 = (y2 - y1)*(1 + bias)*(1 - tension)/2; 42 | m1 += (y3 - y2)*(1 - bias)*(1 - tension)/2; 43 | a0 = 2*mu3 - 3*mu2 + 1; 44 | a1 = mu3 - 2*mu2 + mu; 45 | a2 = mu3 - mu2; 46 | a3 = -2*mu3 + 3*mu2; 47 | return a0*y1 + a1*m0 + a2*m1 + a3*y2; 48 | }, 49 | hermite2d: function(pt0, pt1, pt2, pt3, mu, tension, bias) { 50 | var ret = {x: 0, y: 0}; 51 | ret.x = this.hermite1d(pt0.x, pt1.x, pt2.x, pt3.x, mu, tension, bias); 52 | ret.y = this.hermite1d(pt0.y, pt1.y, pt2.y, pt3.y, mu, tension, bias); 53 | return ret; 54 | }, 55 | }, 56 | } 57 | })(typeof exports == "undefined" ? window : exports); 58 | -------------------------------------------------------------------------------- /public/RequestAnimationFrame.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Provides requestAnimationFrame in a cross browser way. 3 | * http://paulirish.com/2011/requestanimationframe-for-smart-animating/ 4 | */ 5 | 6 | if ( !window.requestAnimationFrame ) { 7 | 8 | window.requestAnimationFrame = ( function() { 9 | 10 | return window.webkitRequestAnimationFrame || 11 | window.mozRequestAnimationFrame || 12 | window.oRequestAnimationFrame || 13 | window.msRequestAnimationFrame || 14 | function( /* function FrameRequestCallback */ callback, /* DOMElement Element */ element ) { 15 | 16 | window.setTimeout( callback, 1000 / 60 ); 17 | 18 | }; 19 | 20 | } )(); 21 | 22 | } 23 | -------------------------------------------------------------------------------- /public/Stats.js: -------------------------------------------------------------------------------- 1 | // stats.js r6 - http://github.com/mrdoob/stats.js 2 | var Stats=function(){function s(a,g,d){var f,c,e;for(c=0;c<30;c++)for(f=0;f<73;f++)e=(f+c*74)*4,a[e]=a[e+4],a[e+1]=a[e+5],a[e+2]=a[e+6];for(c=0;c<30;c++)e=(73+c*74)*4,c'+n+" MS ("+z+"-"+A+")";o.putImageData(B,0,0);F=j;if(j> 9 | v+1E3){l=Math.round(u*1E3/(j-v));w=Math.min(w,l);x=Math.max(x,l);s(y.data,Math.min(30,30-l/100*30),"fps");d.innerHTML=''+l+" FPS ("+w+"-"+x+")";m.putImageData(y,0,0);if(t==3)p=performance.memory.usedJSHeapSize*9.54E-7,C=Math.min(C,p),D=Math.max(D,p),s(E.data,Math.min(30,30-p/2),"mb"),i.innerHTML=''+Math.round(p)+" MB ("+Math.round(C)+"-"+Math.round(D)+")",q.putImageData(E,0,0);v=j;u=0}}}}; 10 | 11 | -------------------------------------------------------------------------------- /public/app.js: -------------------------------------------------------------------------------- 1 | (function() { 2 | var container 3 | , stats 4 | , camera 5 | , cameraTarget 6 | , scene 7 | , projector 8 | , renderer 9 | , particles 10 | , mouse2D 11 | , px 12 | , pz 13 | , ay = 0 14 | , ax = Math.PI/4 15 | , spinRadius = 1500 16 | , particleCount = 20000 17 | , particlesPerBatch = 50 18 | , particleIndex = 0 19 | , lookVector = new THREE.Vector3(0, 0, 0) 20 | , input = { 21 | left: false, 22 | right: false, 23 | up: false, 24 | down: false, 25 | shift: false, 26 | mouseDown: false 27 | } 28 | , socket = io.connect('http://91.203.207.145'); 29 | 30 | function init() { 31 | if (!Detector.webgl) { 32 | Detector.addGetWebGLMessage(); 33 | return; 34 | } 35 | 36 | container = document.createElement('div'); 37 | document.body.appendChild(container); 38 | 39 | camera = new THREE.CombinedCamera(window.innerWidth, window.innerHeight, 45, 1, 10000, -2000, 10000); 40 | camera.position.z = 1400; 41 | cameraTarget = new THREE.Vector3(0, 0, 0); 42 | scene = new THREE.Scene(); 43 | //scene.fog = new THREE.FogExp2(0x000000, 0.0009); 44 | projector = new THREE.Projector(); 45 | var geometry = new THREE.Geometry(); 46 | 47 | var colors = []; 48 | geometry.colors = colors; 49 | for (var i = 0, l = particleCount; i < l; ++i) { 50 | geometry.vertices.push(new THREE.Vertex(new THREE.Vector3(0, 10000, 0))); 51 | colors[i] = new THREE.Color(0xffffff); 52 | colors[i].setHSV(i/particleCount, 1.0, 1.0); 53 | } 54 | var material = new THREE.ParticleBasicMaterial({color: 0xFFFFFF, size: 64, map: THREE.ImageUtils.loadTexture('particle.png'), blending: THREE.AdditiveBlending, transparent: true, vertexColors: true}); 55 | material.color.setHSV(1.0, 0.2, 0.8); 56 | particles = new THREE.ParticleSystem(geometry, material); 57 | particles.sortParticles = true; 58 | particles.updateMatrix(); 59 | scene.add(particles); 60 | 61 | var plane = new THREE.Mesh(new THREE.PlaneGeometry(2000, 2000, 20, 20), new THREE.MeshBasicMaterial({color: 0x555555, wireframe: true})); 62 | plane.rotation.x = -Math.PI/2; 63 | scene.add(plane); 64 | 65 | renderer = new THREE.WebGLRenderer({ clearAlpha: true, antialias: true }); 66 | //renderer.setClearColor(new THREE.Color(0, 1)); 67 | renderer.setSize(window.innerWidth, window.innerHeight); 68 | container.appendChild(renderer.domElement); 69 | 70 | mouse2D = new THREE.Vector3(0, 10000, 0.5); 71 | 72 | stats = new Stats(); 73 | stats.domElement.style.position = 'absolute'; 74 | stats.domElement.style.top = '0px'; 75 | container.appendChild(stats.domElement); 76 | document.addEventListener('mousemove', onMouseMove, false); 77 | document.addEventListener('mousedown', onMouseDown, false); 78 | document.addEventListener('mouseup', onMouseUp, false); 79 | document.addEventListener('keydown', onKeyDown, false); 80 | document.addEventListener('keyup', onKeyUp, false); 81 | window.addEventListener('resize', onWindowResize, false); 82 | 83 | socket.on('p', plot); 84 | animate(); 85 | } 86 | 87 | function onMouseMove(event) { 88 | mouse2D.x = (event.clientX / window.innerWidth) * 2 - 1; 89 | mouse2D.y = -(event.clientY / window.innerHeight) * 2 + 1; 90 | if (!input.mouseDown) return; 91 | var ray = projector.pickingRay(mouse2D.clone(), camera); 92 | var intersects = ray.intersectScene(scene); 93 | if (intersects.length > 0) { 94 | var intersector = intersects[0]; 95 | var s = []; 96 | var move = { 97 | x: intersector.point.x, 98 | y: intersector.point.z, 99 | px: px, 100 | py: pz, 101 | }; 102 | move.dist = Math.sqrt(Math.pow(move.x - move.px, 2) + Math.pow(move.y - move.py, 2)) 103 | px = intersector.point.x; 104 | pz = intersector.point.z; 105 | var pts = smoothener.getSmoothPointSpread(move, 10); 106 | for (var i = 0, l = pts.length; i < l; ++i) { 107 | var pt = pts[i]; 108 | s.push([ 109 | pt.x + Math.random() * 5 - 2.5, 110 | pt.y + Math.random() * 5 - 2.5, 111 | ]); 112 | } 113 | plot(s, true); 114 | } 115 | } 116 | 117 | function plot(data, send) { 118 | for (var i = 0, l = Math.min(particlesPerBatch, data.length); i < l; ++i) { 119 | var v = particles.geometry.vertices[particleIndex]; 120 | particleIndex = particleIndex < particleCount-1 ? particleIndex + 1 : 0; 121 | try { 122 | v.position.x = data[i][0]; 123 | v.position.y = 0; 124 | v.position.z = data[i][1]; 125 | v.__vaporDelay = 300; 126 | } 127 | catch(e) {} 128 | } 129 | if (send) socket.emit('p', data); 130 | } 131 | 132 | function onMouseDown(event) { 133 | input.mouseDown = true; 134 | mouse2D.x = (event.clientX / window.innerWidth) * 2 - 1; 135 | mouse2D.y = -(event.clientY / window.innerHeight) * 2 + 1; 136 | var ray = projector.pickingRay(mouse2D.clone(), camera); 137 | var intersects = ray.intersectScene(scene); 138 | if (intersects.length > 0) { 139 | var intersector = intersects[0]; 140 | px = intersector.point.x; 141 | pz = intersector.point.z; 142 | } 143 | } 144 | 145 | function onMouseUp() { 146 | input.mouseDown = false; 147 | } 148 | 149 | function onKeyDown(event) { 150 | if (event.which == 39) input.right = true; 151 | else if (event.which == 37) input.left = true; 152 | else if (event.which == 40) input.down = true; 153 | else if (event.which == 38) input.up = true; 154 | else if (event.which == 16) input.shift = true; 155 | } 156 | 157 | function onKeyUp(event) { 158 | if (event.which == 39) input.right = false; 159 | else if (event.which == 37) input.left = false; 160 | else if (event.which == 40) input.down = false; 161 | else if (event.which == 38) input.up = false; 162 | else if (event.which == 16) input.shift = false; 163 | } 164 | 165 | function onWindowResize(event) { 166 | camera.aspect = window.innerWidth / window.innerHeight; 167 | camera.updateProjectionMatrix(); 168 | renderer.setSize(window.innerWidth, window.innerHeight); 169 | } 170 | 171 | function animate() { 172 | requestAnimationFrame(animate); 173 | render(); 174 | stats.update(); 175 | } 176 | 177 | function processKeys() { 178 | if (input.up == true) { 179 | if (input.shift) { 180 | if (lookVector.z <= 1000) lookVector.z += 100; 181 | } 182 | else if (spinRadius > 100) spinRadius -= 100; 183 | } 184 | else if (input.down == true) { 185 | if (input.shift) { 186 | if (lookVector.z >= -1000) lookVector.z -= 100; 187 | } 188 | else spinRadius += 100; 189 | } 190 | if (input.right == true) { 191 | if (input.shift) { 192 | if (lookVector.x <= 1000) lookVector.x += 100; 193 | } 194 | else ay += .1; 195 | } 196 | else if (input.left == true) { 197 | if (input.shift) { 198 | if (lookVector.x >= -1000) lookVector.x -= 100; 199 | } 200 | else ay -= .1; 201 | } 202 | } 203 | 204 | function render() { 205 | processKeys(); 206 | var radius = Math.sin(ax) * spinRadius; 207 | cameraTarget.x += (lookVector.x - cameraTarget.x) * 0.05; 208 | cameraTarget.z += (lookVector.z - cameraTarget.z) * 0.05; 209 | camera.position.x += (cameraTarget.x + Math.sin(ay) * radius - camera.position.x) * 0.05; 210 | camera.position.z += (cameraTarget.z + Math.cos(ay) * radius - camera.position.z) * 0.05; 211 | camera.position.y += (Math.cos(ax) * spinRadius - camera.position.y) * 0.05; 212 | camera.lookAt(cameraTarget); 213 | for (var i = 0, l = particles.geometry.vertices.length; i < l; ++i) { 214 | var p = particles.geometry.vertices[i]; 215 | if (p.position.y < 10000) { 216 | if (p.__vaporDelay && p.__vaporDelay > 0) { 217 | p.__vaporDelay -= 1; 218 | continue; 219 | } 220 | //p.position.x += Math.random() * 3; 221 | //p.position.z += Math.random() * 3; 222 | p.position.y += Math.random() * 3; 223 | } 224 | } 225 | particles.geometry.__dirtyVertices = true; 226 | renderer.render(scene, camera); 227 | } 228 | 229 | window.plot = plot; // might as well let people script the particle plotting 230 | window.init = init; 231 | })(); 232 | -------------------------------------------------------------------------------- /public/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | make stuff happen 4 | 5 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 |
61 |
Draw on the grid, please.
62 |
63 | Multiple users may be active.
64 | Rotate View: Left and right arrows.
65 | Zoom: Up and down arrows.
66 | Move: Shift + arrow keys.
67 | Paint: Press mouse + drag.
68 |
69 | Fork me on GitHub 70 | 71 | 72 | -------------------------------------------------------------------------------- /public/jq.js: -------------------------------------------------------------------------------- 1 | /*! jQuery v1.6.4 http://jquery.com/ | http://jquery.org/license */ 2 | (function(a,b){function cu(a){return f.isWindow(a)?a:a.nodeType===9?a.defaultView||a.parentWindow:!1}function cr(a){if(!cg[a]){var b=c.body,d=f("<"+a+">").appendTo(b),e=d.css("display");d.remove();if(e==="none"||e===""){ch||(ch=c.createElement("iframe"),ch.frameBorder=ch.width=ch.height=0),b.appendChild(ch);if(!ci||!ch.createElement)ci=(ch.contentWindow||ch.contentDocument).document,ci.write((c.compatMode==="CSS1Compat"?"":"")+""),ci.close();d=ci.createElement(a),ci.body.appendChild(d),e=f.css(d,"display"),b.removeChild(ch)}cg[a]=e}return cg[a]}function cq(a,b){var c={};f.each(cm.concat.apply([],cm.slice(0,b)),function(){c[this]=a});return c}function cp(){cn=b}function co(){setTimeout(cp,0);return 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-------------------------------------------------------------------------------- /public/particle.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/einaros/shared-particles/6f43607341580ff46be9bf6a5c42e6217eff5c2b/public/particle.png -------------------------------------------------------------------------------- /public/requestanimframe.js: -------------------------------------------------------------------------------- 1 | // shim layer with setTimeout fallback 2 | window.requestAnimFrame = (function(){ 3 | return window.requestAnimationFrame || 4 | window.webkitRequestAnimationFrame || 5 | window.mozRequestAnimationFrame || 6 | window.oRequestAnimationFrame || 7 | window.msRequestAnimationFrame || 8 | function(/* function */ callback, /* DOMElement */ element){ 9 | window.setTimeout(callback, 1000 / 60); 10 | }; 11 | })(); 12 | -------------------------------------------------------------------------------- /public/smoothener.js: -------------------------------------------------------------------------------- 1 | (function(exports) { 2 | exports.smoothener = { 3 | // somewhat fakes an interpolation between two points, 4 | // using the same points as control 5 | getSmoothPointSpread: function(movementInfo, pointSpread) { 6 | if (movementInfo.dist > pointSpread) { 7 | var points = [ 8 | {x: movementInfo.px, y: movementInfo.py}, 9 | {x: movementInfo.px, y: movementInfo.py}, 10 | {x: movementInfo.x, y: movementInfo.y}, 11 | {x: movementInfo.x, y: movementInfo.y} 12 | ]; 13 | points = smoothener.hermiteInterpolatePoints(points, movementInfo.dist / pointSpread, 0.0, 0.0); 14 | points.push({x: movementInfo.x, y: movementInfo.y}); 15 | return points; 16 | } 17 | return [ 18 | {x: movementInfo.px, y: movementInfo.py}, 19 | {x: movementInfo.x, y: movementInfo.y} 20 | ]; 21 | }, 22 | // takes four points, and interpolates between 2 and 3, 23 | // using 1 and 4 as control points 24 | interpolate: function(points, stepSize) { 25 | var spread = Math.sqrt(Math.pow(points[2].x - points[1].x, 2) + 26 | Math.pow(points[2].y - points[1].y, 2)); 27 | var numSteps = Math.max(3, spread / stepSize); 28 | //points = this._evenPointSpread(points, spread); 29 | return smoothener.hermiteInterpolatePoints(points, numSteps, 0, 0); 30 | }, 31 | hermiteInterpolatePoints: function(pointArray, numSteps, tension, bias) { 32 | var stepsize = 1 / numSteps; 33 | var smoothPoints = []; 34 | var pointsJagged = []; 35 | for (var i = 0; i < pointArray.length; ++i) { 36 | pointsJagged.push(pointArray[i]); 37 | } 38 | for (var i = 1; i < pointsJagged.length - 2; ++i) { 39 | for (var steps = 0; steps <= 1; steps += stepsize) { 40 | var p = MathEx.Interpolate.hermite2d( 41 | pointsJagged[i - 1], 42 | pointsJagged[i], 43 | pointsJagged[i + 1], 44 | pointsJagged[i + 2], 45 | steps, 46 | tension, 47 | bias); 48 | smoothPoints.push(p); 49 | } 50 | } 51 | // todo: the smoothPoints don't always include the last jagged point 52 | // adopting an algorithm from paper.js is probably a better idea than doing 53 | // this internally 54 | return smoothPoints; 55 | }, 56 | _evenPointSpread: function(points, spread) { 57 | var newPoints = []; 58 | var prevPoint = {}; 59 | var totalDistance = 0; 60 | var i = 0; 61 | while(i < points.length) { 62 | if (i > 0) { 63 | var distance = MathEx.distance(points[i].x, points[i].y, prevPoint.x, prevPoint.y); 64 | totalDistance += distance; 65 | if (i == points.length - 1 || 66 | Math.abs(totalDistance - spread) < 0.1 * spread || 67 | totalDistance > spread) { 68 | newPoints.push(points[i]); 69 | totalDistance = 0; 70 | } 71 | prevPoint = points[i]; 72 | } 73 | else { 74 | newPoints.push(points[i]); 75 | prevPoint = points[i]; 76 | } 77 | ++i; 78 | } 79 | return newPoints; 80 | }, 81 | } 82 | })(window); 83 | -------------------------------------------------------------------------------- /server.js: -------------------------------------------------------------------------------- 1 | var express = require('express'); 2 | var app = express.createServer(); 3 | var io = require('socket.io').listen(app); 4 | app.listen(8003); 5 | app.use(express.static(__dirname + '/public')); 6 | io.set('log level', 1); 7 | io.sockets.on('connection', function(socket) { 8 | socket.on('p', function(message) { 9 | socket.broadcast.emit('p', message); 10 | }); 11 | }); 12 | process.on('uncaughtException', function (err) { 13 | console.log('Caught exception: ' + err); 14 | }); 15 | --------------------------------------------------------------------------------