給大家分享一個使用css與js生成的唯美炫酷的圖形樹效果，相關代碼如下：
<!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>
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