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canvas_particles_sprites.html
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canvas_particles_sprites.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js canvas - particles - sprites</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background-color: #000000;
margin: 0px;
overflow: hidden;
}
a {
color: #0078ff;
}
</style>
</head>
<body>
<script src="../build/three.min.js"></script>
<script src="js/renderers/Projector.js"></script>
<script src="js/renderers/CanvasRenderer.js"></script>
<script src="js/libs/stats.min.js"></script>
<script src="js/libs/tween.min.js"></script>
<script>
var container, stats;
var camera, scene, renderer, particle;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 5000 );
camera.position.z = 1000;
scene = new THREE.Scene();
var material = new THREE.SpriteMaterial( {
map: new THREE.CanvasTexture( generateSprite() ),
blending: THREE.AdditiveBlending
} );
for ( var i = 0; i < 1000; i++ ) {
particle = new THREE.Sprite( material );
initParticle( particle, i * 10 );
scene.add( particle );
}
renderer = new THREE.CanvasRenderer();
renderer.setClearColor( 0x000040 );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
windowHalfY = window.innerHeight / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function generateSprite() {
var canvas = document.createElement( 'canvas' );
canvas.width = 16;
canvas.height = 16;
var context = canvas.getContext( '2d' );
var gradient = context.createRadialGradient( canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.height / 2, canvas.width / 2 );
gradient.addColorStop( 0, 'rgba(255,255,255,1)' );
gradient.addColorStop( 0.2, 'rgba(0,255,255,1)' );
gradient.addColorStop( 0.4, 'rgba(0,0,64,1)' );
gradient.addColorStop( 1, 'rgba(0,0,0,1)' );
context.fillStyle = gradient;
context.fillRect( 0, 0, canvas.width, canvas.height );
return canvas;
}
function initParticle( particle, delay ) {
var particle = this instanceof THREE.Sprite ? this : particle;
var delay = delay !== undefined ? delay : 0;
particle.position.set( 0, 0, 0 );
particle.scale.x = particle.scale.y = Math.random() * 32 + 16;
new TWEEN.Tween( particle )
.delay( delay )
.to( {}, 10000 )
.onComplete( initParticle )
.start();
new TWEEN.Tween( particle.position )
.delay( delay )
.to( { x: Math.random() * 4000 - 2000, y: Math.random() * 1000 - 500, z: Math.random() * 4000 - 2000 }, 10000 )
.start();
new TWEEN.Tween( particle.scale )
.delay( delay )
.to( { x: 0.01, y: 0.01 }, 10000 )
.start();
}
//
function onDocumentMouseMove( event ) {
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
TWEEN.update();
camera.position.x += ( mouseX - camera.position.x ) * 0.05;
camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
camera.lookAt( scene.position );
renderer.render( scene, camera );
}
</script>
</body>
</html>