canvas方形折叠层次背景效果-html代码-BFW代码库

canvas方形折叠层次背景效果

代码语言：html

所属分类：背景

代码描述：canvas方形折叠层次背景效果

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>
body, html {
  margin: 0;
}

canvas {
  display: block;
  cursor: pointer;
}
</style>

</head>
<body translate="no">
<canvas id="canvas"></canvas>

<script>
/*
  Johan Karlsson, 2020
  https://twitter.com/DonKarlssonSan
  MIT License, see Details View
*/
let canvas;
let ctx;
let w, h;
let colors;

function setup() {
  canvas = document.querySelector("#canvas");
  ctx = canvas.getContext("2d");
  reset();
  window.addEventListener("resize", () => {
    reset();
    draw();
  });
  canvas.addEventListener("click", draw);
  setupColors();
}

function reset() {
  w = canvas.width = window.innerWidth;
  h = canvas.height = window.innerHeight;
}

function draw() {
  let colorTheme = getRandomColorTheme();
  ctx.fillRect(0, 0, w, h);
  let size = 300;
  let diag = Math.sqrt(size*size*2);
  let nrOfColumns = Math.round(w / diag * 2) + 1;
  let nrOfRows = Math.round(h / diag * 4) + 2;
  for(let row = 0; row < nrOfRows; row++) {
    let y = row * diag/4;
    for(let col = 0; col < nrOfColumns; col++) {
      let x = col * diag/2;
      let xOffset = row % 2 * diag/4;
      drawRects(x + xOffset, y, size, colorTheme);
    }
  }  
}

function setupColors() {
  colors = [
    //https://coolors.co/app/000000-ffffff-494949-7c7a7a-ff5d73
    [
      "#000000",
      "#ffffff",
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