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script.js
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script.js
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var canvas;
var gl;
var realToCSSPixels = window.devicePixelRatio;
var displayWidth;
var displayHeight;
var rings;
var createdMetaballs = [];
var assetsIndexToLoad = 0;
var assetsToLoad = [
{path: 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-183/', src: 'noise3.png', name: 'noise3', type: 'texture'}
];
var assets = {};
window.onload = preloadAssets;
function preloadAssets() {
function checkIfAllAssetsAreLoaded() {
if (assetsIndexToLoad < assetsToLoad.length) {
loadAssetIndex(assetsIndexToLoad);
}
else {
initialize();
}
}
function loadAssetIndex(index) {
var objectToLoad = assetsToLoad[index];
switch (objectToLoad.type) {
case 'texture':
var image = new Image();
image.onload = function(event) {
assets[objectToLoad.name] = this;
assetsIndexToLoad++;
checkIfAllAssetsAreLoaded();
};
image.crossOrigin = '';
image.src = objectToLoad.path + objectToLoad.src;
break;
}
}
loadAssetIndex(assetsIndexToLoad);
}
function initialize(){
canvas = document.getElementById('metaball-canvas');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
var glConfig = {
premultipliedAlpha: true,
antialias: true,
depth:true,
alpha: true
}
gl = canvas.getContext('webgl', glConfig) || canvas.getContext('experimental-webgl', glConfig);
if(!gl){
console.error('cannot find gl', gl);
return;
}
displayWidth = Math.floor(gl.canvas.clientWidth / realToCSSPixels);
displayHeight = Math.floor(gl.canvas.clientHeight / realToCSSPixels);
var minSpeed = 0.2;
var maxSpeed = 2.5;
var minMultiplierArcX = -.25;
var maxMultiplierArcX = .75;
var minMultiplierArcY = -.25;
var maxMultiplierArcY = .25;
var scale = 1.0;
var metaballsGroup1 = {
metaballs:[
{ centerOffsetX:26 * scale, centerOffsetY:155 * scale, radius: 70 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-110 * scale, centerOffsetY:10 * scale, radius: 60 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:12 * scale, centerOffsetY:-114 * scale, radius: 48 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-300 * scale, centerOffsetY:20 * scale, radius: 160 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-570 * scale, centerOffsetY:-20 * scale, radius: 50 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
],
texture:generateGradientTexture([{color:'#45E4BE', stop:0.2}, {color:'#63C0D2', stop:.35}, {color:'#A077FC', stop:.55}, {color:'#D97995', stop:.75}, {color:'#F57D5E', stop:1.0}], false, false)
};
var metaballsGroup2 = {
metaballs:[
{ centerOffsetX:-290 * scale, centerOffsetY:60 * scale, radius: 60 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-100 * scale, centerOffsetY:45 * scale, radius: 70 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-60 * scale, centerOffsetY:60 * scale, radius: 60 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:160 * scale, centerOffsetY:170 * scale, radius: 90 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:310 * scale, centerOffsetY:40 * scale, radius: 40 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:450 * scale, centerOffsetY:-120 * scale, radius: 50 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:230 * scale, centerOffsetY:-240 * scale, radius: 70 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:320 * scale, centerOffsetY:-130 * scale, radius: 60 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:110 * scale, centerOffsetY:-70 * scale, radius: 80 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-1070 * scale, centerOffsetY:-500 * scale, radius: 20 * scale, speed: getRandomFloat(0.07, 0.014), t:0.0, arcMultiplierX:getRandomFloat(30.0, 30.0), arcMultiplierY:getRandomFloat(10.0, 10.0) },
],
texture:generateGradientTexture([{color:'#45E4BE', stop:0.0}, {color:'#63C0D2', stop:0.3}, {color:'#A077FC', stop:.4}, {color:'#D97995', stop:.7}], true, false)
};
var metaballsGroup3 = {
metaballs:[
{ centerOffsetX:410 * scale, centerOffsetY:-120 * scale, radius: 18 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:340 * scale, centerOffsetY:-200 * scale, radius: 60 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:200 * scale, centerOffsetY:-190 * scale, radius: 40 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:250 * scale, centerOffsetY:-280 * scale, radius: 16 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
],
texture:generateGradientTexture([{color:'#819CE7', stop:0.56}, {color:'#A077FC', stop:.63}, {color:'#BD76CD', stop:.7}], false, false)
};
var metaballsGroup4 = {
metaballs:[
{ centerOffsetX:-410 * scale, centerOffsetY:-270 * scale, radius: 28 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-490 * scale, centerOffsetY:-230 * scale, radius: 34 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-470 * scale, centerOffsetY:-320 * scale, radius: 40 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-470 * scale, centerOffsetY:320 * scale, radius: 40 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:-430 * scale, centerOffsetY:360 * scale, radius: 30 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
],
texture:generateGradientTexture([{color:'#45E4BE', stop:0.1}, {color:'#63C0D2', stop:.20}, {color:'#819CE7', stop:.4}], false, false)
};
var metaballsGroup5 = {
metaballs:[
{ centerOffsetX:-500 * scale, centerOffsetY:-100 * scale, radius: 24 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:30 * scale, centerOffsetY:-120 * scale, radius: 60 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
{ centerOffsetX:480 * scale, centerOffsetY:170 * scale, radius: 21 * scale, speed: getRandomFloat(minSpeed, maxSpeed), t:Math.random() * 200, arcMultiplierX:getRandomFloat(minMultiplierArcX, maxMultiplierArcX), arcMultiplierY:getRandomFloat(minMultiplierArcY, maxMultiplierArcY) },
],
texture:generateGradientTexture([{color:'#819CE7', stop:0.25}, {color:'#A077FC', stop:.60}, {color:'#BD76CD', stop:0.78}], true, false)
};
createdMetaballs.push(new Metaballs(gl, metaballsGroup2));
createdMetaballs.push(new Metaballs(gl, metaballsGroup1));
createdMetaballs.push(new Metaballs(gl, metaballsGroup3));
createdMetaballs.push(new Metaballs(gl, metaballsGroup4));
createdMetaballs.push(new Metaballs(gl, metaballsGroup5));
for (var i = 0; i < createdMetaballs.length; i++) {
setTimeout(createdMetaballs[i].fadeIn, i * 200);
};
window.addEventListener('resize', onWindowResize);
window.addEventListener('mousemove', onWindowMouseMove);
resizeGL(gl);
step();
}
function generateGradientTexture(colors, vertical, debug) {
colors = colors || [{color:'#000000', stop:0.0}, {color:'#FFF000', stop:.5}, {color:'#642054', stop:1.0}];
vertical = vertical !== undefined ? vertical : false;
var size = 512;
// create canvas
var textureCanvas = document.createElement( 'canvas' );
textureCanvas.width = size;
textureCanvas.height = size;
if(debug == true){
textureCanvas.style.position = 'absolute';
textureCanvas.style.top = '0px';
textureCanvas.style.left = '0px';
document.body.appendChild(textureCanvas);
}
// get context
var context = textureCanvas.getContext( '2d' );
// draw gradient
context.rect( 0, 0, size, size );
var grd = vertical ? context.createLinearGradient(0, size, 0, 0) : context.createLinearGradient(0, 0, size, 0);
for(var i = 0; i < colors.length; i++){
grd.addColorStop(colors[i].stop, colors[i].color);
}
context.fillStyle = grd;
context.fillRect(0, 0, size, size);
return textureCanvas;
}
function getRandomFloat(min, max) {
return Math.random() * (max - min) + min;
}
function onWindowResize(event){
canvas.width = canvas.clientWidth;
canvas.height = canvas.clientHeight;
resizeGL(gl);
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
}
function onWindowMouseMove(event){
createdMetaballs.forEach(function(metaball){
metaball.handleMouseMove(event.clientX, event.clientY);
});
}
function resizeGL(gl) {
realToCSSPixels = window.devicePixelRatio;
// Lookup the size the browser is displaying the canvas in CSS pixels
// and compute a size needed to make our drawingbuffer match it in
// device pixels.
displayWidth = Math.floor(gl.canvas.clientWidth /** realToCSSPixels*/);
displayHeight = Math.floor(gl.canvas.clientHeight /** realToCSSPixels*/);
// Check if the canvas is not the same size.
if (gl.canvas.width !== displayWidth ||
gl.canvas.height !== displayHeight) {
// Make the canvas the same size
gl.canvas.width = displayWidth;
gl.canvas.height = displayHeight;
}
console.log(displayWidth, '___________>>> ',gl.canvas.width );
gl.viewport(0, 0, displayWidth, displayHeight);
createdMetaballs.forEach(function(metaball){
metaball.handleResize(displayWidth, displayHeight);
});
}
var step = function() {
createdMetaballs.forEach(function(metaball){
metaball.updateSimulation();
});
requestAnimationFrame(step);
};