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| − | <html lang="en" >
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| − | <head>
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| − | <meta charset="UTF-8">
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| − | <title>Neurons</title>
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| | | | |
| − | <script type="text/javascript">
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| − | window.onload = function() {
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| − |
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| − | // Adjustable variables
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| − | var settings = {
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| − | pointDensity: 8,
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| − | connections: 2,
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| − | sizeVariation: 1.4,
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| − | velocity: 0.00003,
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| − | maxMovement: 50,
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| − | attractionRange: 400,
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| − | attractionFactor: 0.06,
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| − | imagePath: 'https://static.igem.org/mediawiki/2018/2/26/T--Pasteur_Paris--icon-neuroneblanc.png',
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| − | imgWidth: 20,
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| − | imgHeight: 18,
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| − | lineColor: "rgba(255,255,255,0.4)",
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| − | particleDensity: 0.2,
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| − | particleChance: 0.2,
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| − | particleVelocity: 70,
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| − | particleColor: "rgba(255,255,255,0.8)",
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| − | particleLength: 10,
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| − | flashRadius: 20,
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| − | flashOpacity: 0.6,
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| − | flashDecay: 0.2
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| − | }
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| − |
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| − | var start = null,
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| − | delta = 0,
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| − | lasttimestamp = null;
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| − |
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| − | var points = [],
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| − | particles = [];
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| − |
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| − | var mousePoint = {x: 0, y: 0};
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| − |
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| − | var img = new Image();
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| − | img.src = settings.imagePath;
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| − |
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| − | var canvas = document.getElementById('canvas'),
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| − | ctx = canvas.getContext('2d');
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| − |
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| − | // resize the canvas to fill browser window dynamically
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| − | var resizeTimer;
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| − | window.addEventListener('resize', resizeCanvas, false);
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| − | function resizeCanvas() {
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| − | clearTimeout(resizeTimer);
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| − | resizeTimer = setTimeout(function() {
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| − | canvas.width = window.innerWidth;
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| − | canvas.height = window.innerHeight;
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| − | createPoints();
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| − | drawFrame();
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| − | }, 250);
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| − |
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| − | }
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| − | resizeCanvas();
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| − |
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| − | createPoints();
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| − |
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| − | document.onmousemove = handleMouseMove;
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| − |
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| − | window.requestAnimationFrame(animate);
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| − |
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| − | function createPoints() {
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| − | points = [];
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| − | particles = [];
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| − | for(var x = 0 - 100; x < canvas.width + 100; x = x + 1000/settings.pointDensity) {
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| − | for(var y = 0 - 100; y < canvas.height + 100; y = y + 1000/settings.pointDensity) {
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| − | var px = Math.floor(x + Math.random()*1000/settings.pointDensity);
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| − | var py = Math.floor(y + Math.random()*1000/settings.pointDensity);
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| − | var pSizeMod = Math.random()*settings.sizeVariation+1
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| − | var pw = settings.imgWidth*pSizeMod;
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| − | var ph = settings.imgHeight*pSizeMod;
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| − | var pAnimOffset = Math.random()*2*Math.PI;
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| − | var p = {x: px, originX: px, y: py, originY: py, w: pw, h: ph, sizeMod: pSizeMod, animOffset: pAnimOffset, attraction: 0, flashOpacity: 0};
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| − | points.push(p);
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| − | }
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| − | }
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| − |
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| − | // for each point find the closest points. From https://tympanus.net/codrops/2014/09/23/animated-background-headers/
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| − | for(var i = 0; i < points.length; i++) {
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| − | var closest = [];
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| − | var p1 = points[i];
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| − | for(var j = 0; j < points.length; j++) {
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| − | var p2 = points[j]
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| − | if(!contains(p2.closest, p1) && p1 != p2) {
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| − | var placed = false;
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| − | for(var k = 0; k < settings.connections; k++) {
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| − | if(!placed && closest[k] == undefined) {
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| − | closest[k] = p2;
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| − | placed = true;
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| − | }
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| − | }
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| − |
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| − | for(var k = 0; k < settings.connections; k++) {
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| − | if(!placed && getDistance(p1, p2) < getDistance(p1, closest[k])) {
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| − | closest[k] = p2;
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| − | placed = true;
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| − | }
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| − | }
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| − | }
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| − | }
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| − | p1.closest = closest;
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| − | }
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| − | }
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| − |
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| − | function animate(timestamp) {
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| − | // Calculate frametime
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| − | if (!start) {
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| − | start = timestamp;
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| − | lasttimestamp = timestamp;
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| − | }
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| − | var elapsed = timestamp - start,
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| − | delta = (timestamp - lasttimestamp)/100;
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| − | lasttimestamp = timestamp;
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| − |
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| − | // Move points around
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| − | for (var i = 0; i < points.length; i++) {
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| − | var point = points [i];
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| − |
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| − | var attractionOffset = {x: 0, y: 0};
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| − | var distanceToMouse = getDistance({x: point.originX, y: point.originY}, mousePoint);
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| − | if (distanceToMouse <= settings.attractionRange) {
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| − | displacementFactor = (Math.cos(distanceToMouse / settings.attractionRange * Math.PI) + 1) / 2 * settings.attractionFactor;
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| − | attractionOffset.x = displacementFactor * (mousePoint.x - point.x);
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| − | attractionOffset.y = displacementFactor * (mousePoint.y - point.y);
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| − | }
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| − |
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| − | point.x = point.originX + Math.sin(elapsed*settings.velocity+point.animOffset)*settings.maxMovement*point.sizeMod+attractionOffset.x;
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| − | point.y = point.originY - Math.cos(elapsed*settings.velocity+point.animOffset)*settings.maxMovement*point.sizeMod+attractionOffset.y;
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| − |
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| − | point.flashOpacity = Math.max(0, point.flashOpacity - settings.flashDecay * delta);
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| − | }
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| − |
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| − | // Move particles
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| − | for (var i = 0; i < particles.length; i++) {
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| − | var particle = particles[i];
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| − |
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| − | var origin = points[particle.origin];
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| − | var target = origin.closest[particle.target];
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| − |
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| − | var distance = getDistance({x: origin.x, y: origin.y}, {x: target.x, y: target.y});
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| − | var direction = {x: (target.x - origin.x) / distance, y: (target.y - origin.y) / distance};
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| − |
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| − | particle.traveled += settings.particleVelocity * delta;
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| − | particle.direction = direction;
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| − |
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| − | particle.x = origin.x + direction.x * particle.traveled;
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| − | particle.y = origin.y + direction.y * particle.traveled;
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| − |
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| − | if (!between(origin, {x: particle.x}, target)) {
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| − | particles.splice(i, 1);
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| − | i--;
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| − | }
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| − |
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| − | }
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| − |
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| − | // Spawn new particles
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| − | for (var i = 0; i < settings.particleDensity * points.length; i++) {
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| − | if (Math.random() < settings.particleChance * delta) {
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| − | var pOriginNum = Math.floor(Math.random()*points.length);
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| − | var pOrigin = points[pOriginNum];
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| − | var pTargetNum = Math.floor(Math.random()*pOrigin.closest.length);
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| − | var px = pOrigin.x;
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| − | var py = pOrigin.y;
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| − | var p = {origin: pOriginNum, target: pTargetNum, x: px, y: py, traveled: 0, direction: {x: 0, y: 0}};
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| − | particles.push(p);
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| − | pOrigin.flashOpacity = settings.flashOpacity;
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| − | }
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| − | }
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| − |
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| − | drawFrame();
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| − |
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| − | window.requestAnimationFrame(animate);
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| − |
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| − | }
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| − |
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| − | function handleMouseMove(event) {
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| − | mousePoint.x = event.pageX;
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| − | mousePoint.y = event.pageY;
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| − | // console.log(mousePoint.x, mousePoint.y);
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| − | }
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| − |
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| − | function drawFrame() {
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| − | ctx.clearRect(0,0,canvas.width,canvas.height);
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| − |
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| − | for (var i = 0; i < points.length; i++) {
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| − | drawLines(points[i]);
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| − | }
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| − |
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| − | for (var i = 0; i < particles.length; i++) {
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| − | var particle = particles[i];
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| − | ctx.moveTo(particle.x, particle.y);
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| − | ctx.lineTo(particle.x - particle.direction.x * settings.particleLength, particle.y - particle.direction.y * settings.particleLength);
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| − | ctx.strokeStyle = settings.particleColor;
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| − | ctx.stroke();
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| − | }
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| − |
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| − | for (var i = 0; i < points.length; i++) {
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| − | var point = points [i];
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| − | if (point.flashOpacity > 0) {
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| − | ctx.beginPath();
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| − | ctx.rect(point.x - settings.flashRadius, point.y - settings.flashRadius, settings.flashRadius * 2, settings.flashRadius * 2);
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| − | var gradient = ctx.createRadialGradient(point.x, point.y, settings.flashRadius, point.x, point.y, 1);
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| − | gradient.addColorStop(0, "rgba(255, 255, 255, 0)");
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| − | gradient.addColorStop(1, "rgba(255, 255, 255, " + point.flashOpacity + ")");
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| − | ctx.fillStyle = gradient;
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| − | ctx.fill();
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| − | }
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| − | ctx.drawImage(img, point.x-point.w/2, point.y-point.h/2, point.w, point.h);
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| − | }
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| − | }
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| − |
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| − | function drawLines(p) {
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| − | for(var i in p.closest) {
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| − | ctx.beginPath();
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| − | ctx.moveTo(p.x, p.y);
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| − | ctx.lineTo(p.closest[i].x, p.closest[i].y);
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| − | ctx.strokeStyle = settings.lineColor;
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| − | ctx.stroke();
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| − | }
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| − | }
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| − |
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| − | //Util
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| − | function getDistance(p1, p2) {
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| − | return Math.sqrt(Math.pow(p1.x - p2.x, 2) + Math.pow(p1.y - p2.y, 2));
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| − | }
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| − |
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| − | function contains(a, obj) {
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| − | if (a !== undefined) {
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| − | for (var i = 0; i < a.length; i++) {
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| − | if (a[i] === obj) {
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| − | return true;
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| − | }
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| − | }
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| − | }
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| − | return false;
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| − | }
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| − |
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| − | function between(p1, p2, t) {
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| − | return (p1.x - p2.x) * (p2.x - t.x) > 0;
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| − | }
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| − |
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| − | }
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| − |
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| − | </script>
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| − |
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| − |
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| − |
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| − | <style type="text/css">
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| − | body, html {
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| − | margin: 0;
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| − | padding: 0;
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| − | min-width: 100%;
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| − | min-height: 100%;
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| − | }
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| − |
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| − | body {
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| − | position: relative;
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| − | background-image: linear-gradient(to right, rgb(168, 48, 91), rgb(161, 47, 92), rgb(128, 52, 110),rgb(84, 59, 126),rgb(52, 82, 146));
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| − | z-index: -300;
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| − | font-family:Arial, sans-serif;
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| − | text-align: center;
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| − | }
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| − |
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| − | #canvas {
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| − | display: block;
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| − | z-index: 1;
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| − | }
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| − | .title{
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| − | z-index: 600;
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| − | font-family:Arial, sans-serif;
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| − | text-align: center;
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| − | vertical-align: center;
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| − | position: fixed;
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| − | }
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| − |
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| − | body::after {
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| − | z-index: 10;
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| − | position: absolute;
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| − | display: block;
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| − | width: 100%;
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| − | height: 100%;
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| − | top: 0;
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| − | left: 0;
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| − | content: '';
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| − | }
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| − |
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| − |
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| − | </style>
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| − |
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| − | </head>
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| − |
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| − | <body>
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| − | <canvas id="canvas">
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| − | </canvas>
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| − | </body>
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| − |
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| − |
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| − |
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| − |
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| − | <!--
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| − | Copyright (c) 2018 by thwischm (https://codepen.io/thwischm/pen/pbBvwj) - MIT License
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| − |
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| − |
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| − | Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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| − |
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| − | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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| − |
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| − | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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| − | -->
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| − |
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| − |
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| − | </html>
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