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canvas_particles_shapes.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js canvas - particles with shapes</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 {
font-family: Monospace;
background-color: #f0f0f0;
margin: 0px;
overflow: hidden;
}
</style>
</head>
<body>
<script src="../build/three.min.js"></script>
<script src="js/Stats.js"></script>
<script src="js/Tween.js"></script>
<script src="js/Sparks.js"></script>
<!-- load the font file from canvas-text -->
<script src="fonts/helvetiker_regular.typeface.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
var text, plane;
var targetRotation = 0;
var targetRotationOnMouseDown = 0;
var mouseX = 0;
var mouseXOnMouseDown = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var heartShape, particleCloud, sparksEmitter, emitterPos;
var _rotation = 0;
var timeOnShapePath = 0;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
var info = document.createElement( 'div' );
info.style.position = 'absolute';
info.style.top = '10px';
info.style.width = '100%';
info.style.textAlign = 'center';
info.innerHTML = 'Three.js with Love. Simple Particle Systems with Shapes by <a href="http://www.lab4games.net/zz85/blog">zz85</a><br>Move your mouse.';
container.appendChild( info );
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.set( 0, 150, 700 );
scene = new THREE.Scene();
// Get text from hash
var string = "THREE.JS";
var hash = document.location.hash.substr( 1 );
if ( hash.length !== 0 ) {
string = hash;
}
var text3d = new THREE.TextGeometry( string, {
size: 80,
height: 20,
curveSegments: 2,
font: "helvetiker"
});
text3d.computeBoundingBox();
var centerOffset = -0.5 * ( text3d.boundingBox.max.x - text3d.boundingBox.min.x );
var textMaterial = new THREE.MeshBasicMaterial( { color: Math.random() * 0xffffff, overdraw: true } );
text = new THREE.Mesh( text3d, textMaterial );
// Potentially, we can extract the vertices or faces of the text to generate particles too.
// Geo > Vertices > Position
text.position.x = centerOffset;
text.position.y = 100;
text.position.z = 0;
text.rotation.x = 0;
text.rotation.y = Math.PI * 2;
parent = new THREE.Object3D();
parent.add( text );
particleCloud = new THREE.Object3D(); // Just a group
particleCloud.y = 800;
parent.add( particleCloud );
scene.add( parent );
// Create Particle Systems
// Heart
var x = 0, y = 0;
heartShape = new THREE.Shape();
heartShape.moveTo( x + 25, y + 25 );
heartShape.bezierCurveTo( x + 25, y + 25, x + 20, y, x, y );
heartShape.bezierCurveTo( x - 30, y, x - 30, y + 35,x - 30,y + 35 );
heartShape.bezierCurveTo( x - 30, y + 55, x - 10, y + 77, x + 25, y + 95 );
heartShape.bezierCurveTo( x + 60, y + 77, x + 80, y + 55, x + 80, y + 35 );
heartShape.bezierCurveTo( x + 80, y + 35, x + 80, y, x + 50, y );
heartShape.bezierCurveTo( x + 35, y, x + 25, y + 25, x + 25, y + 25 );
var circleLines = function ( context ) {
context.lineWidth = 0.05;
context.beginPath();
context.arc( 0, 0, 1, 0, Math.PI*2, true );
context.closePath();
context.stroke();
context.globalAlpha = 0.2;
context.fill();
}
var hue = 0;
var hearts = function ( context ) {
context.globalAlpha = 0.5;
var x = 0, y = 0;
context.scale(0.1, -0.1); // Scale so canvas render can redraw within bounds
context.beginPath();
// From http://blog.burlock.org/html5/130-paths
context.bezierCurveTo( x + 2.5, y + 2.5, x + 2.0, y, x, y );
context.bezierCurveTo( x - 3.0, y, x - 3.0, y + 3.5,x - 3.0,y + 3.5 );
context.bezierCurveTo( x - 3.0, y + 5.5, x - 1.0, y + 7.7, x + 2.5, y + 9.5 );
context.bezierCurveTo( x + 6.0, y + 7.7, x + 8.0, y + 5.5, x + 8.0, y + 3.5 );
context.bezierCurveTo( x + 8.0, y + 3.5, x + 8.0, y, x + 5.0, y );
context.bezierCurveTo( x + 3.5, y, x + 2.5, y + 2.5, x + 2.5, y + 2.5 );
context.closePath();
context.fill();
context.lineWidth = 0.5; //0.05
context.stroke();
}
var setTargetParticle = function() {
//hearts circleLines
var material = new THREE.ParticleCanvasMaterial( { program: hearts, blending:THREE.AdditiveBlending } );
material.color.setHSV(hue, 0.5, 1);
hue += 0.001;
if (hue>1) hue-=1;
particle = new THREE.Particle( material );
particle.scale.x = particle.scale.y = Math.random() * 20 +20;
particleCloud.add( particle );
return particle;
};
var onParticleCreated = function( p ) {
var position = p.position;
p.target.position = position;
};
var onParticleDead = function(particle) {
particle.target.visible = false;
particleCloud.remove(particle.target);
};
sparksEmitter = new SPARKS.Emitter(new SPARKS.SteadyCounter(160));
emitterpos = new THREE.Vector3();
sparksEmitter.addInitializer(new SPARKS.Position( new SPARKS.PointZone( emitterpos ) ) );
sparksEmitter.addInitializer(new SPARKS.Lifetime(0,2));
sparksEmitter.addInitializer(new SPARKS.Target(null, setTargetParticle));
sparksEmitter.addInitializer(new SPARKS.Velocity(new SPARKS.PointZone(new THREE.Vector3(0,-50,10))));
// TOTRY Set velocity to move away from centroid
sparksEmitter.addAction(new SPARKS.Age());
//sparksEmitter.addAction(new SPARKS.Accelerate(0.2));
sparksEmitter.addAction(new SPARKS.Move());
sparksEmitter.addAction(new SPARKS.RandomDrift(50,50,2000));
sparksEmitter.addCallback("created", onParticleCreated);
sparksEmitter.addCallback("dead", onParticleDead);
sparksEmitter.start();
// End Particles
renderer = new THREE.CanvasRenderer();
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( 'mousedown', onDocumentMouseDown, 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 );
}
//
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
function onDocumentMouseDown( event ) {
event.preventDefault();
mouseXOnMouseDown = event.clientX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
if ( sparksEmitter.isRunning() ) {
sparksEmitter.stop();
} else {
sparksEmitter.start();
}
}
function onDocumentMouseMove( event ) {
mouseX = event.clientX - windowHalfX;
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
}
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
timeOnShapePath += 0.0337;
if (timeOnShapePath > 1) timeOnShapePath -= 1;
// TODO Create a PointOnShape Action/Zone in the particle engine
var pointOnShape = heartShape.getPointAt( timeOnShapePath );
emitterpos.x = pointOnShape.x * 5 - 100;
emitterpos.y = -pointOnShape.y * 5 + 400;
// Pretty cool effect if you enable this
//particleCloud.rotation.y += 0.05;
parent.rotation.y += ( targetRotation - parent.rotation.y ) * 0.05;
renderer.render( scene, camera );
}
</script>
</body>
</html>