原生js实现月亮河面涟漪夜色效果-html代码-BFW代码库

原生js实现月亮河面涟漪夜色效果

代码语言：html

所属分类：动画

代码描述：原生js实现月亮河面涟漪夜色效果

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">

<style>
* {
  margin: 0;
  padding: 0;
}

canvas#canvas {
  display: block;
  background: #360033;
  background: -webkit-linear-gradient(to bottom, #0b8793, #360033);
  background: linear-gradient(to bottom, #0b8793, #360033); 
}
</style>

</head>
<body translate="no">
<canvas id="canvas">Canvas not supported.</canvas>

<script>
(function () {
  'use strict';
  window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');

    if (!canvas || !canvas.getContext) {
      return false;
    }

    /********************
        Random Number
      ********************/

    function rand(min, max) {
      return Math.floor(Math.random() * (max - min + 1) + min);
    }

    /********************
        Var
      ********************/

    var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;
    var mouseX = X / 2;
    var mouseY = Y / 2;
    var shapes = [];
    var shapeNum = Y / 4;

    /********************
                            Animation
                          ********************/

    window.requestAnimationFrame =
    window.requestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (cb) {
      setTimeout(cb, 17);
    };

    /********************
         Shape
       ********************/

    function Shape(ctx, x, y, i) {
      this.ctx = ctx;
      this.init(x, y, i);
    }

    Shape.prototype.init = function (x, y, i) {
      this.x = x;
      this.y = y;
      this.i = i;
      this.r = 2;
      this.a = rand(0, 360);
      this.rad = this.a * Math.PI / 180;
      this.ga = Math.random() * Math.random() * Math.random();
      this.inA = Math.random();
      this.scaleX = 100 - i / 2;
      this.dist = shapeNum - i;
    };

    Shape.prototype.draw = function () {
      var ctx = this.ctx;
      ctx.save();
      ctx.fillStyle = 'white';
      ctx.globalCompositeOperation = 'lighter';
      ctx.globalAlpha = this.ga;
      ctx.translate(Math.sin(this.rad) * this.dist + this.x, this.y);
      ctx.scale(this.scaleX, 1);
      ctx.translate(-Math.sin(this.rad) * this.dist - this.x, -this.y);
      ctx.beginPath();
      ctx.arc(Math.sin(this.rad) * this.dist + this.x, this.y, this.r, 0, Math.PI * 2, false);
      ctx.fill();
      ctx.restore();
    };

    Shape.prototype.updateParams = function () {
      this.a += this.inA;
      this.rad = this.a * Math.PI / 180;
    };

    Shape.prototype.render = function () {
      this.updateParams();
      this.draw();
    };

    for (var i = 0; i < shapeNum; i++) {
      var s = new Shape(ctx,.........完整代码请登录后点击上方下载按钮下载查看