js实现炫酷三角canvas背景动画效果代码-html代码-BFW代码库

js实现炫酷三角canvas背景动画效果代码

代码语言：html

所属分类：背景

代码描述：js实现炫酷三角canvas背景动画效果代码

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">



</head>
<body>

<script>


class Utils {
  // 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(hue, saturation, lightness) {
    return (
      "hsl(" +
      hue +
      ", " +
      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;
  }
   // create multiple array
  static createMultipleArray(number_one, number_two) {
    let num_one = number_one;
    let num_two = number_two;
    let arr = new Array(num_one);
    for (let i = 0; i < num_one; i++) {
      arr[i] = new Array(num_one);
      for (let j = 0; j < num_two; j++) {
        arr[i][j] = 0;
      }
    }
    return arr;
  }
  // framerate
  static calcFPS() {
    const now = (+new Date());
    const fps = 1000 / (now - lastTime);
    lastTime = now;
    return fps.toFixed();
  }
}

/*
* File Name / vector2d.js
* Referenced / O'Reilly Programming HTML5 Canvas
* Author / Toshiya Marukubo
* Twitter / https://twitter.com/toshiyamarukubo
*/

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

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

  add(v, x, y) {
    if (v instanceof Vector2d) {
      return new Vector2d(this.vx + v.vx, this.vy + v.vy);
    } else {
      this.vx += x;
      this.v.........完整代码请登录后点击上方下载按钮下载查看