canvas实现彩色迷宫动画代码-html代码-BFW代码库

canvas实现彩色迷宫动画代码

代码语言：html

所属分类：动画

代码描述：canvas实现彩色迷宫动画代码

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>
"use strict"; // Paul Slaymaker, paul25882@gmail.com
const body = document.getElementsByTagName("body").item(0);
body.style.background = "#000";
const TP = 2 * Math.PI;
const CSIZE = 360;

const ctx = (() => {
  let d = document.createElement("div");
  d.style.textAlign = "center";
  body.append(d);
  let c = document.createElement("canvas");
  c.width = c.height = 2 * CSIZE;
  d.append(c);
  return c.getContext("2d");
})();
ctx.setTransform(1, 0, 0, 1, CSIZE, CSIZE);
ctx.lineCap = "round";

onresize = () => {
  let D = Math.min(window.innerWidth, window.innerHeight) - 40;
  ctx.canvas.style.width = ctx.canvas.style.height = D + "px";
};

const getRandomInt = (min, max, low) => {
  if (low) return Math.floor(Math.random() * Math.random() * (max - min)) + min;else
  return Math.floor(Math.random() * (max - min)) + min;
};

var colors = [];
var hues = [];
var setColors = () => {
  colors = [];
  let colorCount = 3;
  let h = getRandomInt(180, 270);
  for (let i = 0; i < colorCount; i++) {
    let hd = Math.round(180 / colorCount) * i + getRandomInt(-10, 10);
    let hue = (h + hd) % 360;
    hues.splice(getRandomInt(0, hues.length + 1), 0, hue);
  }
  for (let i = 0; i < colorCount; i++) colors[i] = "hsl(" + hues[i] + ",98%,40%)";
};

const df = [
point => {return pts[point.i + 1][point.j];},
point => {return pts[point.i][point.j + 1];},
point => {return pts[point.i - 1][point.j];},
point => {return pts[point.i][point.j - 1];}];


const iptX = [[2, 3, 1, 0], [3, 2, 0, 1]];

var getFalsePoint = () => {
  let pt = pts[getRandomInt(1, CT - 1, true)][getRandomInt(1, CT - 1, true)];
  while (pt.d) {
    pt = pts[getRandomInt(1, CT - 1, true)][getRandomInt(1, CT - 1, true)];
  }
  return pt;
};

function SPath(idx) {
  let initPoint = getFalsePoint();
  initPoint.d = true;
  initPoint.ppt = pts[0][0];
  this.pa = [initPoint];
  this.path;
  this.term;
  this.ipt = iptX[0];
  this.grow = sec => {
    for (let c = 0; c < this.pa.length; c++) {
      let ci = this.pa.length - c - 1;
      let pt = this.pa[ci];
      if (sec && pt == this.growPoint) continue;
      for (let ic = 0; ic < 4; ic++) {
        let dfunc = df[this.ipt[ic]];
        let cpt = dfunc(pt);
        if (cpt.d) continue;
        if (cpt == this.shrinkPoint) continue;
        cpt.d = true;
        pt.cpa.push(cpt);
        cpt.ppt = pt;
        this.pa.push(cpt);
        if (sec) this.growPoint2 = cpt;else

        this.growPoint = cpt;
        return true;
      }
    }
    return false;
  };

  this.setShrink = () => {
    this.shrinkPoint = false;
    if (this.pa.length < 3) {
      return;
    }
    let pt = this.pa[0];
    if (pt.cpa.length < 2) {
      this.shrinkPoint = pt;
      return;
    }
    for (let i = 1; i < this.pa.length - 1; i++) {// -4 not needed?
      // always shrink from oldest end, if possible
      let pt = this.pa[i];
      if (pt == this.growPoint) continue;
      if (pt.cpa.length == 0) {
        this.shrinkPoint = pt;
        return;
      }
    }
    this.shrinkPoint = false;
  };
  this.shrink2 = () => {
    if (!this.shrinkPoint) return;
    let pt = this.shrinkPoint;
    if (this.pa[0] == pt) {
      if (!pt.ppt.d) pt.ppt = false;
    } else {
      if (pt.ppt.cpa.length) {
        let idx = pt.ppt.cpa.indexOf(pt);
        pt.ppt.cpa.splice(idx, 1);
      }
    }
    pt.cpa = [];
    let idx2 = this.pa.indexOf(pt);
    this.pa.splice(idx2, 1);
    pt.d = false;
  };
  this.setPath = .........完整代码请登录后点击上方下载按钮下载查看