欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  web前端

css和js实现的好看的图形树

程序员文章站 2022-05-11 09:33:58
...
本文主要和大家分享css和js实现的好看的图形树实例,希望能帮助到大家。

给大家分享一个使用css与js生成的唯美炫酷的图形树效果,相关代码如下:


<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>cloth</title>
  <style>
    @import url(http://fonts.googleapis.com/css?family=Poiret+One);
html {
  overflow: hidden;
  touch-action: none;
  content-zooming: none;
}
body {
  position: absolute;
  margin: 0;
  padding: 0;
  background: #000;
  width: 100%;
  height: 100%;
}
#canvas {
  width: 100%;
  height: 100%;
  background: #000;
  position: absolute;
}
#text {
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  pointer-events: none;
}
#text p {
  position: absolute;
  color: #888;
  left: 0;
  width: 100%;
  text-align: center;
  top: -12vmin;
  font-family: 'Poiret One', cursive;
  font-size: 6vmin;
}   
  </style>
</head>
<body>
  <canvas id="canvas"></canvas>
<p id="text">
  <p id="clic" nowrap>
</p>
<script type="text/javascript" src="http://cdn.gbtags.com/jquery/1.11.1/jquery.min.js"></script>
  <script>
    ! function() {
  "use strict";
  // variables
  var root = null;
  var hue = 0;
  var automove = true;
  var angleX = 0;
  var angleY = 0;
  /////////////////////////
  var resolution = 1;
  var maxLevels = 6;
  var branchLength = 10 * resolution;
  var leafSize = 100;
  var growSpeed = 2;
  var maxAngle = 1.2;
  var freq = 0.3;
  /////////////////////////
  // branch constructor
  function Branch(parent, level, hue, x, y) {
    this.parent = parent;
    this.b1 = null;
    this.b2 = null;
    this.b3 = null;
    this.hue = hue;
    this.p0 = parent ? parent.p1 : new Point(x, y, 0);
    this.p1 = new Point(
      x,
      y,
      parent === root ?
      0 :
      (
        parent ?
        parent.p1.z + (
          level ?
          Math.random() * 10 - 5 :
          0
        ) :
        0
      )
    );
    this.level = level;
    this.life = 0;
    this.angle = 0;
    this.vx = 0;
    this.vy = 0;
  }
  // grow branch
  Branch.prototype.grow = function() {
    // z move
    this.p1.z--;
    // 3D projection
    this.p1.project();
    // recursively grow children branches
    this.b1 && this.b1.grow();
    this.b2 && this.b2.grow();
    // grow
    if (this.life-- > 1) {
      this.p1.x += this.vx;
      this.p1.y += this.vy;
    }
    // done - push more children branches
    if (this.life === 1 && this.level > 0) {
      this.b1 = newBranch(this);
      if (Math.random() <= freq) this.b2 = newBranch(this);
      this.life--;
    }
    // cut the tree
    if (this.p0.z <= -250) {
      this.parent = null;
    }
    // draw the branch 
    var width = resolution * (this.level === 1 ?
      1 :
      ((this.level + 1) * (this.level + 1)) * 0.5 * this.p1.scale
    );
    var color = 100 - Math.abs(this.p0.z * 0.5);
    ctx.beginPath();
    if (this.level) {
      ctx.lineWidth = width;
      ctx.strokeStyle = "hsl(" + (this.hue % 360) + ", 14%," + color + "%)";
      ctx.moveTo(this.p0.xp, this.p0.yp);
      ctx.lineTo(this.p1.xp, this.p1.yp);
      ctx.stroke();
    } else {
      ctx.globalCompositeOperation = "lighter";
      var c = ((this.hue + 180) % 360);
      ctx.fillStyle = "hsl(" + c + ", 100%, 70%)";
      ctx.arc(this.p1.xp, this.p1.yp, width * leafSize * 0.1, 0, Math.PI * 2);
      ctx.fill();
      ctx.beginPath();
      ctx.fillStyle = "hsl(" + c + ", 60%, 6%)";
      ctx.arc(this.p1.xp, this.p1.yp, width * leafSize, 0, Math.PI * 2);
      ctx.fill();
      ctx.globalCompositeOperation = "source-over";
    }
  }
  // 3D point constructor
  function Point(x, y, z) {
    this.x = x;
    this.y = y;
    this.z = z;
    this.scale = 0;
    this.xp = 0;
    this.yp = 0;
  }
  // 3D point projection
  Point.prototype.project = function() {
    this.scale = 265 / (265 + this.z);
    this.xp = canvas.centerX + (this.x - canvas.centerX) * this.scale;
    this.yp = canvas.centerY + (this.y - canvas.centerY) * this.scale;
  }
  // new branch factory
  function newBranch(parent) {
    var branch = new Branch(parent, parent.level - 1, hue, parent.p1.x, parent.p1.y);
    branch.angle = Math.atan2(
      parent.p1.y - parent.p0.y,
      parent.p1.x - parent.p0.x
    ) + (branch.level ?
      (Math.random() * maxAngle - (maxAngle * 0.5)) :
      0
    );
    branch.vx = Math.cos(branch.angle) * growSpeed;
    branch.vy = Math.sin(branch.angle) * growSpeed;
    branch.life = branch.level ?
      Math.round(Math.random() * branch.level * branchLength) + 1 :
      2;
    return branch;
  }
  // animate the tree
  function tree() {
    // clear screen
    ctx.fillStyle = '#000';
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    // pointer trail
    if (pointer.moveDistance > 10 * resolution) {
      pointer.moveDistance = 0;
      // main trunk
      var branch = new Branch(
        root,
        root.level,
        hue,
        root.p1.x,
               root.p1.y
      );
      // add another branch
      if (Math.random() <= freq) root.b1 = newBranch(root);
      // new root
      root = branch;
      root.p1.x = pointer.x;
      root.p1.y = pointer.y;
    }
    // increment color
    hue++;
    // traverse the tree
    var trunk = root;
    while (trunk) {
      trunk.grow();
      trunk = trunk.parent;
    }
  }
  // prepare the canvas
  var canvas = {
    elem: document.getElementById('canvas'),
    resize: function() {
      this.width = this.elem.width = this.elem.offsetWidth * resolution;
      this.height = this.elem.height = this.elem.offsetHeight * resolution;
      this.centerX = this.width * 0.5;
      this.centerY = this.height * 0.5;
    }
  }
  var ctx = canvas.elem.getContext("2d");
  window.addEventListener('resize', canvas.resize.bind(canvas), false);
  canvas.resize();
  // pointer events
  var pointer = {
    x: 0,
    y: 0,
    px: 0,
    py: 0,
    moveDistance: 0,
    move: function(e) {
      e.preventDefault();
      var pointer = e.targetTouches ? e.targetTouches[0] : e;
      // stop automove
      if (automove) {
        automove = false;
        document.getElementById("clic").innerHTML = "";
      }
      this.x = pointer.clientX * resolution;
      this.y = pointer.clientY * resolution;
      this.distance();
      // render tree
      requestAnimationFrame(tree);
    },
    distance: function() {
      var dx = this.x - this.px;
      var dy = this.y - this.py;
      this.moveDistance += Math.sqrt(dx * dx + dy * dy);
      // speed limit
      if (!automove && this.moveDistance > 40) {
        this.x = this.px + dx * 0.1;
        this.y = this.py + dy * 0.1;
      }
      this.px = this.x;
      this.py = this.y;
    }
  }
  window.addEventListener("mousemove", pointer.move.bind(pointer), false);
  canvas.elem.addEventListener("touchmove", pointer.move.bind(pointer), false);
  // auto start
  ! function auto() {
    automove && requestAnimationFrame(auto);
    // lissajou
    pointer.x = canvas.centerX + canvas.centerX * Math.cos(angleX += 0.02) * 0.20;
    pointer.y = canvas.centerY + canvas.centerY * Math.sin(angleY += 0.04) * 0.25;
    pointer.distance();
    // create the first branch
    if (!root) {
      root = new Branch(false, maxLevels, hue, pointer.x, pointer.y);
      root.p0 = root.p1;
      root.p0.project();
    }
    // render tree
    tree();
  }();
}();
  </script>
</body>
</html>

以上就是css和js实现的好看的图形树的详细内容,更多请关注其它相关文章!