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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Pixel Cloud</title>
<style>
* {
margin: 0;
padding: 0;
}
html, body {
margin: 0;
padding: 0;
overflow: hidden;
}
#stage {
overflow-x: hidden;
overflow-y: auto;
height: 100vh;
width: 100vw;
font-size: 0;
}
</style>
</head>
<body>
<div id="stage"></div>
<script>
function shuffleArray(array) {
for (var i = array.length - 1; i > 0; i--) {
var j = Math.floor(Math.random() * (i + 1));
var temp = array[i];
array[i] = array[j];
array[j] = temp;
}
return array;
}
function generateUID() {
var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz';
var uid = '';
for (var i=0; i<32; i++) {
uid += chars.charAt(Math.round(Math.random()*(chars.length-1)));
}
return uid;
}
function getRandomColorHex() {
var letters = '0123456789ABCDEF'.split('');
var color = '#';
for (var i = 0; i < 6; i++ ) {
color += letters[Math.round(Math.random() * 15)];
}
return color;
}
function getRandomRGBString() {
var o = Math.round, r = Math.random, s = 255;
return o(r()*s) + ',' + o(r()*s) + ',' + o(r()*s);
}
function getScrollbarWidth() {
var outer = document.createElement("div");
outer.style.visibility = "hidden";
outer.style.width = "100px";
outer.style.msOverflowStyle = "scrollbar"; // needed for WinJS apps
document.body.appendChild(outer);
var widthNoScroll = outer.offsetWidth;
outer.style.overflow = "scroll";
var inner = document.createElement("div");
inner.style.width = "100%";
outer.appendChild(inner);
var widthWithScroll = inner.offsetWidth;
outer.parentNode.removeChild(outer);
return widthNoScroll - widthWithScroll;
}
var animationDuration = 240; //animation duration in frames, 60 equals one second
var canvas;
var context;
var stage = document.getElementById('stage');
var stageWidth = window.innerWidth;
var stageHeight = window.innerHeight;
var minimumParticleSize = 32;
var maximumParticleSize = Math.floor(window.innerWidth / 10);
var availSpace = window.innerWidth * window.innerHeight;
var currentParticleSize = minimumParticleSize;
var rows;
var cols;
var dataArray = [];
var dataArrayLength = Math.ceil(Math.random()*2500);
var bufferedArrayLength = dataArrayLength + 2;
var animateArray = [];
var dataPositionObject = {};
var addPosition;
var tick;
var startAnimationFrame = 0;
var debounceTimeout = 150;
function generateDimensions() {
var availSpace = stageWidth * stageHeight;
currentParticleSize = maximumParticleSize;
var requiredSpace = maximumParticleSize * maximumParticleSize * bufferedArrayLength;
while (requiredSpace > availSpace && currentParticleSize > minimumParticleSize) {
--currentParticleSize;
requiredSpace = currentParticleSize * currentParticleSize * bufferedArrayLength;
}
var exactColCount = Math.floor(stageWidth / currentParticleSize);
stageWidth = exactColCount * currentParticleSize;
var minimumRows = Math.floor(window.innerHeight / currentParticleSize);
if (((minimumRows - 1) * exactColCount) < bufferedArrayLength) {
if (getScrollbarWidth() > 0 && (stageWidth - (exactColCount * currentParticleSize)) > (currentParticleSize * 2)) {
stageWidth = stageWidth - currentParticleSize;
stageHeight = Math.ceil(bufferedArrayLength / (exactColCount - 1)) * currentParticleSize;
} else {
stageHeight = Math.ceil(bufferedArrayLength / exactColCount) * currentParticleSize;
}
} else {
stageHeight = window.innerHeight;
}
rows = Math.ceil(stageHeight / currentParticleSize);
cols = Math.ceil(stageWidth / currentParticleSize);
}
function buildCanvas() {
var canvas = document.createElement("canvas");
canvas.id = "canvas";
canvas.setAttribute("width", stageWidth);
canvas.setAttribute("height", stageHeight);
stage.innerHTML = "";
stage.appendChild(canvas);
context = canvas.getContext("2d");
backingStoreRatio = context.webkitBackingStorePixelRatio ||
context.mozBackingStorePixelRatio ||
context.msBackingStorePixelRatio ||
context.oBackingStorePixelRatio ||
context.backingStorePixelRatio || 1,
ratio = devicePixelRatio / backingStoreRatio;
if (devicePixelRatio !== backingStoreRatio) {
var oldWidth = canvas.width;
var oldHeight = canvas.height;
canvas.width = oldWidth * ratio;
canvas.height = oldHeight * ratio;
canvas.style.width = oldWidth + 'px';
canvas.style.height = oldHeight + 'px';
context.scale(ratio, ratio);
}
}
function prefillArray(count, bufferElements) {
var dataArray = {};
var i = 0;
while (i < count) {
dataArray[i] = {};
dataArray[i].color = getRandomRGBString();
dataArray[i].id = i;
dataArray[i].speed = Math.random() * (animationDuration/2000 - 0);
dataArray[i].title = "particle" + i;
dataArray[i].message = generateUID();
++i;
}
var j = 0;
while (j < bufferElements) {
dataArray[i] = {};
dataArray[i].color = '255,255,255';
dataArray[i].id = 'add';
dataArray[i].speed = Math.random() * (animationDuration/2000 - 0);
dataArray[i].title = "add" + i;
dataArray[i].message = generateUID();
++j;
++i;
}
console.log(dataArray)
return dataArray;
}
function generateSlots(max) {
var arr = [];
var i = 0;
while (i < rows) {
var j = 0;
while (j < cols) {
var element = [j, i];
arr.push(element);
++j;
}
++i;
}
return arr;
}
function fillStage(arr) {
if (arr === undefined) {
arr = prefillArray(dataArrayLength,1);
}
var placementArray = generateSlots(arr.length);
placementArray = shuffleArray(placementArray);
var i = 0;
while (i < placementArray.length) {
var position = placementArray[i];
var posX = position[0];
var posY = position[1];
var slot;
slot = arr[i];
if (slot !== undefined) {
placementArray[i].push(slot.id);
dataPositionObject[posX + "." + posY] = slot.id;
if (slot.id === 'add') {
addPosition = posX + "." + posY;
}
}
if (slot !== undefined) {
renderParticle(posX, posY, currentParticleSize, slot.color, 0);
animateArray.push([posX, posY, slot.color, slot.speed]);
}
++i;
}
}
function animateStage() {
tick = requestAnimationFrame(innerTick);
}
function innerTick() {
var j = 0;
context.clearRect(0, 0, stageWidth, stageHeight);
while (j < animateArray.length) {
renderParticle(animateArray[j][0], animateArray[j][1], currentParticleSize, animateArray[j][2], 0+animateArray[j][3]*startAnimationFrame, 1);
++j;
}
++startAnimationFrame;
if (startAnimationFrame < animationDuration) {
tick = requestAnimationFrame(innerTick);
}
else {
cancelAnimationFrame(tick);
tick = null;
}
}
function renderParticle(x, y, size, color, opacity) {
context.fillStyle = "rgba("+ color + "," + opacity + ")";
context.beginPath();
context.rect(x*size,y*size,size,size);
context.fill();
}
function buildStage() {
generateDimensions();
buildCanvas();
fillStage();
animateStage();
console.log(addPosition)
}
function load() {
buildStage();
}
window.onload = load;
var resizeTimer;
window.addEventListener('resize', function(e) {
clearTimeout(resizeTimer);
resizeTimer = setTimeout(function() {
buildStage();
}, debounceTimeout);
});
</script>
</body>
</html>