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网页飘雪的具体实现-12
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/416896/873690/12-snowy.js
Particle3D=function(material){
THREE.Particle.call(this,material);
this.velocity=new THREE.Vector3(4,-4,1);//速度;
//this.velocity.rotateX(2);//旋转;
this.gravity=new THREE.Vector3(0,0,0);//加速度;
this.drag=1;//速度相乘系数;
};
//Particle:粒子;
//prototype:原形;
Particle3D.prototype=new THREE.Particle();
Particle3D.prototype.constructor=Particle3D;//构造函数
Particle3D.prototype.updatePhysics=function(){
this.velocity.multiplyScalar(this.drag);//矢量相乘函数
this.velocity.addSelf(this.gravity);//矢量相加函数
this.position.addSelf(this.velocity);//矢量相加函数
}
var TO_RADIANS=Math.PI/180;//角度向弧度转换系数*
THREE.Vector3.prototype.rotateY=function(angle){
//绕Y轴顺时针旋转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){
//绕X轴顺时针旋转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){
//绕Z轴顺时针旋转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;//粒子
var camera;
var scene;
var renderer;
var starSnow = 1;
var particles = [];
var particleImage = new Image();
//THREE.ImageUtils.loadTexture( "img/ParticleSmoke.png" );
particleImage.src = 'http://www.lmlblog.com/blog/12/images/xue.png';
function init() {
//alert("message3");
container = document.createElement('div');//container：画布实例;
document.body.appendChild(container);
camera = new THREE.PerspectiveCamera( 60, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
camera.position.z = 1000;
//camera.position.y = 50;
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) } );
//alert("message2");
for (var i = 0; i < 500; i++) {
//alert("message");
particle = new Particle3D( material);
particle.position.x = Math.random() * 2000-1000;
particle.position.z = Math.random() * 2000-1000;
particle.position.y = Math.random() * 2000-1000;
//particle.position.y = Math.random() * (1600-particle.position.z)-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 );
document.addEventListener( 'touchend', onDocumentTouchEnd, false );
setInterval( loop, 1000 / 60 );
}
var touchStartX;
var touchFlag = 0;//储存当前是否滑动的状态;
var touchSensitive = 80;//检测滑动的灵敏度;
//var touchStartY;
//var touchEndX;
//var touchEndY;
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();//取消默认关联动作;
touchStartX = 0;
touchStartX = event.touches[ 0 ].pageX ;
//touchStartY = event.touches[ 0 ].pageY ;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
var direction = event.touches[ 0 ].pageX - touchStartX;
if (Math.abs(direction) > touchSensitive) {
if (direction>0) {touchFlag = 1;}
else if (direction<0) {touchFlag = -1;};
//changeAndBack(touchFlag);
}
}
}
function onDocumentTouchEnd (event) {
// if ( event.touches.length == 0 ) {
// event.preventDefault();
// touchEndX = event.touches[ 0 ].pageX ;
// touchEndY = event.touches[ 0 ].pageY ;
// }这里存在问题
var direction = event.changedTouches[ 0 ].pageX - touchStartX;
changeAndBack(touchFlag);
}
function changeAndBack (touchFlag) {
var speedX = 25*touchFlag;
touchFlag = 0;
for (var i = 0; i < particles.length; i++) {
particles[i].velocity=new THREE.Vector3(speedX,-10,0);
}
var timeOut = setTimeout(";", 800);
clearTimeout(timeOut);
var clearI = setInterval(function () {
if (touchFlag) {
clearInterval(clearI);
return;
};
speedX*=0.8;
if (Math.abs(speedX)<=1.5) {
speedX=0;
clearInterval(clearI);
};
for (var i = 0; i < particles.length; i++) {
particles[i].velocity=new THREE.Vector3(speedX,-10,0);
}
},100);
}
function loop() {
for(var i = 0; i<particles.length; i++){
var particle = particles[i];
particle.updatePhysics();
with(particle.position)
{
if((y<-1000)&&starSnow) {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.lookAt(scene.position);
renderer.render( scene, camera );
}