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怎么样使用css与js生成图形树效果?

2018-03-02 21:16:49 来源:www.45fan.com 【

怎么样使用css与js生成图形树效果?

效果图如下所示:

怎么样使用css与js生成图形树效果?

在线演示:Here~

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 div {
 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>
<div id="text">
 <div id="clic" nowrap>
</div>
<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>

总结

以上所述是小编给大家介绍的使用css与js生成的唯美炫酷的图形树效果,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对路饭网站的支持!


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Tags: css 生成 炫酷
编辑:路饭网
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