html5的canvas实现3d雪花飘舞效果
复制代码代码如下:
VAR SCREEN_WIDTH = window.innerWidth;
var SCREEN_HeiGHT = window.innerHeight;
/p>
p>
var container;
/p>
p>
var particle;
/p>
p>
var camera;
var scene;
var renderer;
/p>
p>
var mouseX = 0;
var mouseY = 0;
/p>
p>
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var particles = [];
var particleImage = new Image();
//ThrEE.ImageUtils.loadTexture( "img/ParticlESMoke.png" );
particleImage.src = 'images/ParticleSmoke.png';
/p>
p>
function inIT() {
/p>
p>
container = document.createElement('div');
document.body.apPEndChild(container);
/p>
p>
camera = new THREE.PerspectiveCamera( 75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
camera.position.z = 1000;
/p>
p>
scene = new THREE.Scene();
scene.add(camera);
renderer = new THREE.CanvasRenderer();
renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
var MATErial = new THREE.ParticleBasicMaterial( {
map: new THREE.Texture(particleImage) }
);
for (var i = 0;
i 500;
i++) {
/p>
p>
particle = new Particle3D( material);
particle.position.x = Math.random() * 2000 - 1000;
particle.position.y = Math.random() * 2000 - 1000;
particle.position.z = Math.random() * 2000 - 1000;
particle.scale.x = particle.scale.y = 1;
scene.add( particle );
particles.push(particle);
}
/p>
p>
container.appendChild( renderer.domElement );
/p>
p>
document.addEventListener( 'mouSEMove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
setInterval( loop, 1000 / 60 );
}
function onDocumentMouseMove( event ) {
/p>
p>
mouseX = event.clientX - windowHalfX;
mouseY = event.clientY - windowHalfY;
}
/p>
p>
function onDocumentTouchStart( event ) {
/p>
p>
if ( event.touches.length == 1 ) {
/p>
p>
event.preventDefault();
/p>
p>
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
/p>
p>
function onDocumentTouchMove( event ) {
/p>
p>
if ( event.touches.length == 1 ) {
/p>
p>
event.PReventDefault();
/p>
p>
mouseX = event.touches[ 0 ].pageX - windowHalfX;
mouseY = event.touches[ 0 ].pageY - windowHalfY;
}
}
/p>
p>
///p>
p>
function loop() {
/p>
p>
for(var i = 0;
iparticles.length;
i++)
{
/p>
p>
var particle = particles[i];
particle.updatePhysics();
with(particle.position)
{
if(y-1000) y+=2000;
if(x>
1000) x-=2000;
else if(x-1000) x+=2000;
if(z>
1000) z-=2000;
else if(z-1000) z+=2000;
}
}
camera.position.x += ( mouseX - camera.position.x ) * 0.05;
camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
camera.lookAt(scene.position);
/p>
p>
renderer.render( scene, camera );
/p>
p>
}
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