网页飘雪的具体实现-14
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.gf.qytechs.cn/scripts/416897/873691/14-snowy.js
Particle3D=function(material){
THREE.Particle.call(this,material);
this.velocity=new THREE.Vector3(0,-8,0);
this.velocity.rotateX(randomRange(-45,45));
this.velocity.rotateY(randomRange(0,360));
this.gravity=new THREE.Vector3(0,0,0);
this.drag=1;
};
Particle3D.prototype=new THREE.Particle();
Particle3D.prototype.constructor=Particle3D;
Particle3D.prototype.updatePhysics=function(){
this.velocity.multiplyScalar(this.drag);
this.velocity.addSelf(this.gravity);
this.position.addSelf(this.velocity);
}
var TO_RADIANS=Math.PI/180;
THREE.Vector3.prototype.rotateY=function(angle){
cosRY=Math.cos(angle*TO_RADIANS);
sinRY=Math.sin(angle*TO_RADIANS);
var tempz=this.z;;
var tempx=this.x;
this.x=(tempx*cosRY)+(tempz*sinRY);
this.z=(tempx*-sinRY)+(tempz*cosRY);
}
THREE.Vector3.prototype.rotateX=function(angle){
cosRY=Math.cos(angle*TO_RADIANS);
sinRY=Math.sin(angle*TO_RADIANS);
var tempz=this.z;;
var tempy=this.y;
this.y=(tempy*cosRY)+(tempz*sinRY);
this.z=(tempy*-sinRY)+(tempz*cosRY);
}
THREE.Vector3.prototype.rotateZ=function(angle){
cosRY=Math.cos(angle*TO_RADIANS);
sinRY=Math.sin(angle*TO_RADIANS);
var tempx=this.x;;
var tempy=this.y;
this.y=(tempy*cosRY)+(tempx*sinRY);
this.x=(tempy*-sinRY)+(tempx*cosRY);
}
function randomRange(min,max){
return((Math.random()*(max-min))+ min);
}
var SCREEN_WIDTH = window.innerWidth;
var SCREEN_HEIGHT = window.innerHeight;
var container;
var particle;
var camera;
var scene;
var renderer;
var mouseX = 0;
var mouseY = 0;
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';
function init() {
container = document.createElement('div');
document.body.appendChild(container);
camera = new THREE.PerspectiveCamera( 75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
camera.position.z = 1000;
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++) {
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);
}
container.appendChild( renderer.domElement );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
setInterval( loop, 1000 / 60 );
}
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 loop() {
for(var i = 0; i<particles.length; i++)
{
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);
renderer.render( scene, camera );
}