雪花飘落
# 雪花飘落效果
<div class="snow">雪花飘落的地区</div>
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<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/three.js/r46/Three.min.js"></script>
<script>
function randomRange(t,i){return Math.random()*(i-t)+t}Particle3D=function(t){THREE.Particle.call(this,t),this.velocity=new THREE.Vector3(0,-2,0),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(t){cosRY=Math.cos(t*TO_RADIANS),sinRY=Math.sin(t*TO_RADIANS);var i=this.z,o=this.x;this.x=o*cosRY+i*sinRY,this.z=o*-sinRY+i*cosRY},THREE.Vector3.prototype.rotateX=function(t){cosRY=Math.cos(t*TO_RADIANS),sinRY=Math.sin(t*TO_RADIANS);var i=this.z,o=this.y;this.y=o*cosRY+i*sinRY,this.z=o*-sinRY+i*cosRY},THREE.Vector3.prototype.rotateZ=function(t){cosRY=Math.cos(t*TO_RADIANS),sinRY=Math.sin(t*TO_RADIANS);var i=this.x,o=this.y;this.y=o*cosRY+i*sinRY,this.x=o*-sinRY+i*cosRY};
$(function(){var container=document.querySelector(".snow");if(/MSIE 6|MSIE 7|MSIE 8/.test(navigator.userAgent)){return}else{if(/MSIE 9|MSIE 10/.test(navigator.userAgent)){$(container).css("height",$(window).height()).bind("click",function(){$(this).fadeOut(1000, function(){$(this).remove()})})}}var containerWidth=$(container).width();var containerHeight=$(container).height();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();particleImage.src="https://www.coding10.com/assets/img/snow.png";var snowNum=500;function init(){camera=new THREE.PerspectiveCamera(75,containerWidth/containerHeight,1,10000);camera.position.z=1000;scene=new THREE.Scene();scene.add(camera);renderer=new THREE.CanvasRenderer();renderer.setSize(containerWidth,containerHeight);var material=new THREE.ParticleBasicMaterial({map:new THREE.Texture(particleImage)});for(var i=0;i<snowNum;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,1000/40)}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)*0.005;camera.position.y+=(-mouseY-camera.position.y)*0.005;camera.lookAt(scene.position);renderer.render(scene,camera)}init()});
</script>
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上次更新: 2022/02/28, 22:19:14