基于three.js实现特定Div容器的粒子特效封装

　　　本文基于three.js实现特定容器的粒子特效效果，支持用户传入特定的dom对象以及粒子颜色。

　　移入库

<script src="jquery-1.11.3.min.js" type="text/javascript"> </script>
<script src="three.min.js" type="text/javascript"></script>
<script src="bodong.js" type="text/javascript"></script>　

　　Html页面指定容器

<!-- 波动动画 -->
<div id="particles" style="width:100%; overflow:hidden; height:200px;background:#383232;"></div>

　　创建波动示例并完成容器绑定

<srcipt>
    $(function(){
    //构造波动对象，指定dom元素，指定粒子颜色字符串
    var BodongObj=new Bodong($(‘#particles‘),‘#c0cbff‘);
    BodongObj.init();
    BodongObj.animate();
    })

</script>

　　第三方库下载链接

　　http://v.bootstrapmb.com/2019/4/u0d54217/dom01/three.min.js

　　核心代码（bodong.js）

  1 function Bodong(domElement,color) {
  2     var SEPARATION = 100,
  3         AMOUNTX = 50,
  4         AMOUNTY = 50;
  5     var container;
  6     var camera, scene, renderer;
  7     var particles, particle, count = 0;
  8     var mouseX = -660,
  9         mouseY = -210;
 10     var windowHalfX = domElement.innerWidth() / 2;
 11     var windowHalfY = domElement.innerHeight() / 1;
 12
 13     this.init = function() {
 14         container = document.createElement("div");
 15         container.id = "banner-canvas";
 16         document.getElementById("particles").appendChild(container);
 17         camera = new THREE.PerspectiveCamera(75, domElement.innerWidth() / domElement.innerHeight(), 1, 10000);
 18         camera.position.z = 1000;
 19         scene = new THREE.Scene();
 20         particles = new Array();
 21         var e = Math.PI * 2;
 22         var d = new THREE.ParticleCanvasMaterial({
 23             color: color||"#46c37b",
 24             program: function(f) {
 25                 f.beginPath();
 26                 f.arc(0, 0, 1, 0, e, true);
 27                 f.fill()
 28             }
 29         });
 30         var a = 0;
 31         for (var b = 0; b < AMOUNTX; b++) {
 32             for (var c = 0; c < AMOUNTY; c++) {
 33                 particle = particles[a++] = new THREE.Particle(d);
 34                 particle.position.x = b * SEPARATION - ((AMOUNTX * SEPARATION) / 2);
 35                 particle.position.z = c * SEPARATION - ((AMOUNTY * SEPARATION) / 2);
 36                 scene.add(particle)
 37             }
 38         }
 39         renderer = new THREE.CanvasRenderer();
 40         renderer.setSize(domElement.innerWidth(), domElement.innerHeight());
 41         container.appendChild(renderer.domElement);
 42         document.addEventListener("mousemove", this.onDocumentMouseMove, false);//整个页面监听鼠标移动事件
 43         domElement.on("resize", this.onWindowResize, false);
 44     }
 45
 46     this.onWindowResize = function() {
 47         windowHalfX = domElement.innerWidth() / 2;
 48         windowHalfY = domElement.innerHeight() / 2;
 49         camera.aspect = domElement.innerWidth() / domElement.innerHeight();
 50         camera.updateProjectionMatrix();
 51         renderer.setSize(domElement.innerWidth(), domElement.innerHeight())
 52     }
 53
 54     this.onDocumentMouseMove = function(a) {
 55         mouseX = a.clientX - windowHalfX;//水平移动距离
 56         mouseY = a.clientY - windowHalfY;//竖直移动距离
 57         mouseY=mouseY>0?-mouseY:mouseY;//防止视角上扬
 58     }
 59
 60     this.onDocumentTouchStart = function(a) {
 61         if (a.touches.length === 1) {
 62             a.preventDefault();
 63             mouseX = a.touches[0].pageX - windowHalfX;
 64             mouseY = a.touches[0].pageY - windowHalfY
 65         }
 66     }
 67
 68     this.onDocumentTouchMove = function(a) {
 69         if (a.touches.length === 1) {
 70             a.preventDefault();
 71             mouseX = a.touches[0].pageX - windowHalfX;
 72             mouseY = a.touches[0].pageY - windowHalfY
 73         }
 74     }
 75
 76     this.animate = function() {
 77         requestAnimationFrame(this.animate.bind(this));//绑定this
 78         this.render()
 79     }
 80
 81     this.render = function() {
 82         camera.position.x += (mouseX - camera.position.x) * 0.05;
 83         camera.position.y += (-mouseY - camera.position.y) * 0.05;
 84         camera.lookAt(scene.position);
 85         var a = 0;
 86         for (var b = 0; b < AMOUNTX; b++) {
 87             for (var c = 0; c < AMOUNTY; c++) {
 88                 particle = particles[a++];
 89                 particle.position.y = (Math.sin((b + count) * 0.3) * 50) + (Math.sin((c + count) * 0.5) * 50);
 90                 particle.scale.x = particle.scale.y = (Math.sin((b + count) * 0.3) + 1) * 2 + (Math.sin((c + count) * 0.5) + 1) * 2
 91             }
 92         }
 93         renderer.render(scene, camera);
 94         count += 0.08
 95     };
 96
 97 }
 98
 99 /*--------------------测试数据------------------------*/
100
101 //var BodongObj=new Bodong($(‘#particles‘),‘#c0cbff‘);
102 //BodongObj.init();
103 //BodongObj.animate();

bodong.js

　　在线Dome效果链接（以整个网页为容器，本文在此基础上进行封装）

　　http://v.bootstrapmb.com/2019/4/u0d54217/

原文地址：https://www.cnblogs.com/giserjobs/p/11875729.html