Dieser Artikel zeigt Ihnen hauptsächlich Beispiele für schöne Grafikbäume, die in CSS und JS implementiert sind. Ich hoffe, er kann Ihnen helfen.
Ich möchte mit Ihnen einen schönen und coolen grafischen Baumeffekt teilen, der mit CSS und JS generiert wurde. Der relevante Code lautet wie folgt:
<!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>Das obige ist der detaillierte Inhalt vonWunderschöner grafischer Baum, implementiert mit CSS und JS. Für weitere Informationen folgen Sie bitte anderen verwandten Artikeln auf der PHP chinesischen Website!
