canvas实现炫酷粒子效果以及流星效果_canvas粒子效果-优快云博客

本文链接：https://blog.youkuaiyun.com/BOOLTechnology/article/details/128800502

本文主要介绍了如何利用JavaScript和CSS技术创建出炫酷的粒子效果和流星雨效果。通过详细讲解两个部分的内容，帮助读者掌握在网页中实现动态视觉效果的方法。

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一：粒子效果

<html>

<head>
  <meta charset="utf-8">
  <title>www.husonghe.com</title>
  <style>
    html {
      height: 100%;
      background-image: -webkit-radial-gradient(ellipse farthest-corner at center center, #1b44e4 0%, #020f3a 100%);
      background-image: radial-gradient(ellipse farthest-corner at center center, #1b44e4 0%, #020f3a 100%);
      cursor: move;
    }

    body {
      width: 100%;
      margin: 0;
      overflow: hidden;
    }
  </style>
</head>

<body>


  <canvas id="canv" width="1920" height="572"></canvas>
  <script>
    var num = 200;
    var w = window.innerWidth;
    var h = window.innerHeight;
    var max = 100;
    var _x = 0;
    var _y = 0;
    var _z = 150;
    var dtr = function (d) {
      return d * Math.PI / 180;
    };

    var rnd = function () {
      return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180);
    };
    var dist = function (p1, p2, p3) {
      return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2));
    };

    var cam = {
      obj: {
        x: _x,
        y: _y,
        z: _z
      },
      dest: {
        x: 0,
        y: 0,
        z: 1
      },
      dist: {
        x: 0,
        y: 0,
        z: 200
      },
      ang: {
        cplane: 0,
        splane: 0,
        ctheta: 0,
        stheta: 0
      },
      zoom: 1,
      disp: {
        x: w / 2,
        y: h / 2,
        z: 0
      },
      upd: function () {
        cam.dist.x = cam.dest.x - cam.obj.x;
        cam.dist.y = cam.dest.y - cam.obj.y;
        cam.dist.z = cam.dest.z - cam.obj.z;
        cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
        cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
        cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
        cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
      }
    };

    var trans = {
      parts: {
        sz: function (p, sz) {
          return {
            x: p.x * sz.x,
            y: p.y * sz.y,
            z: p.z * sz.z
          };
        },
        rot: {
          x: function (p, rot) {
            return {
              x: p.x,
              y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
              z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
            };
          },
          y: function (p, rot) {
            return {
              x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
              y: p.y,
              z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
            };
          },
          z: function (p, rot) {
            return {
              x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
              y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
              z: p.z
            };
          }
        },
        pos: function (p, pos) {
          return {