原生js实现多彩铁球摆动动画效果代码-html代码-BFW代码库

原生js实现多彩铁球摆动动画效果代码

代码语言：html

所属分类：动画

代码描述：原生js实现多彩铁球摆动动画效果代码

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;
}

html,
body {
  overflow: hidden;
}

body {
  position: relative;
}
</style>



</head>

<body>

      <script>


/*
     Common Tool.
   */

class Tool {
  // random number.
  static randomNumber(min, max) {
    return Math.floor(Math.random() * (max - min + 1) + min);
  }
  // random color rgb.
  static randomColorRGB() {
    return (
      "rgb(" +
      this.randomNumber(0, 255) +
      ", " +
      this.randomNumber(0, 255) +
      ", " +
      this.randomNumber(0, 255) +
      ")");

  }
  // random color hsl.
  static randomColorHSL(saturation, lightness) {
    return (
      "hsl(" +
      this.randomNumber(0, 360) +
      ", " +
      saturation +
      "%, " +
      lightness +
      "%)");

  }
  // gradient color.
  static gradientColor(ctx, cr, cg, cb, ca, x, y, r) {
    const col = cr + "," + cg + "," + cb;
    const g = ctx.createRadialGradient(x, y, 0, x, y, r);
    g.addColorStop(0, "rgba(" + col + ", " + ca * 1 + ")");
    g.addColorStop(0.5, "rgba(" + col + ", " + ca * 0.5 + ")");
    g.addColorStop(1, "rgba(" + col + ", " + ca * 0 + ")");
    return g;
  }}


/*
       When want to use angle.
     */

class Angle {
  constructor(angle) {
    this.a = angle;
    this.rad = this.a * Math.PI / 180;
  }

  incDec(num) {
    this.a += num;
    this.rad = this.a * Math.PI / 180;
    return this.rad;
  }}


/*
       When want to use controller.
     */

class Controller {
  constructor(id) {
    this.id = document.getElementById(id);
  }
  getVal() {
    return this.id.value;
  }}


/*
       When want to use time.
     */

class Time {
  constructor(time) {
    this.startTime = time;
    this.lastTime;
    this.elapsedTime;
  }

  getElapsedTime() {
    this.lastTime = Date.now();
    this.elapsedTime = (this.startTime - this.lastTime) * -1;
    return this.elapsedTime;
  }}


/*
       When want to use vector.
     */

class Vector2d {
  constructor(x, y) {
    this.vx = x;
    this.vy = y;
  }

  scale(scale) {
    this.vx *= scale;
    this.vy *= scale;
  }

  add(vec2) {
    this.vx += vec2.vx;
    this.vy += vec2.vy;
  }

  sub(vec2) {
    this.vx -= vec2.vx;
    this.vy -= vec2.vy;
  }

  negate() {
    this.vx = -this.vx;
    this.vy = -this.vy;
  }

  length() {
    return Math.sqrt(this.vx * this.vx + this.vy * this.vy);
  }

  lengthSquared() {
    return this.vx * this.vx + this.vy * this.vy;
  }

  normalize() {
    let len = Math.sqrt(this.vx * this.vx + this.vy * this.vy);
    if (len) {
      this.vx /= len;
      this.vy /= len;
    }
    return len;
  }

  rotate(angle) {
    let vx = this.vx;
    let vy = this.vy;
    let cosVal = Math.cos(angle);
    let sinVal = Math.sin(angle);
    this.vx = vx * cosVal - vy * sinVal;
    this.vy = vx * sinVal + vy * cosVal;
  }

  toString() {
    return '(' + this.vx.toFixed(3) + ',' + this.vy.toFixed(3) + ')';
  }}


let canvas;

class Canvas {
  constructor(bool) {
    // create canvas.
    this.canvas = document.createElement("canvas");
    // if on screen.
    if (bool === true) {
      this.canvas.style.display = 'block';
      this.canvas.style.top = 0;
      this.canvas.style.left = 0;
      document.getElementsByTagName("body")[0].appendChild(this.canvas);
    }
    this.ctx = this.canvas.getContext("2d");
    .........完整代码请登录后点击上方下载按钮下载查看