canvas之钻石

admin · 发表于 2015-6-14 15:19:34

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta name="Keywords" content="" />
<meta name="Description" content="" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=2,user-scalable=yes,minimal-ui" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<title>canvas之钻石</title>
<style>
html,body{margin:0;padding:0;height:100%;overflow:hidden;background-color:#000;}
</style>
</head>
<body>
<canvas></canvas>
<script>
//<![CDATA[
"use strict";
var run=window.requestAnimationFrame||window.webkitRequestAnimationFrame||function(cb){return setTimeout(cb,16.6)},
W=window.innerWidth,
H=window.innerHeight;
function diamond(cx,cy,radius,cvs)
{
var Vector3d=typeof Float32Array==="function"?Float32Array:Array,
len=8,len1=32,total=len*3*3+len1*3*2+3,
fl=radius*2.5,
g=cvs.getContext("2d"),
idx=0,
arr=new Vector3d(total),
move=new Vector3d(total),
i=0,radius1,startAngle,angle,
angleX=0,angleY=0.005;
cvs.width=W;
cvs.height=H;
g.strokeStyle="#FFF";
for(radius1=radius*0.58,angle=Math.PI*2/len;i<len;i++)
{
arr[idx++]=Math.cos(angle*i)*radius1;
arr[idx++]=Math.sin(angle*i)*radius1;
arr[idx++]=-radius*0.175;
}
for(i=0,radius1=radius*0.8,angle=Math.PI*2/len,startAngle=angle/2;i<len;i++)
{
arr[idx++]=Math.cos(angle*i+startAngle)*radius1;
arr[idx++]=Math.sin(angle*i+startAngle)*radius1;
arr[idx++]=-radius*0.08;
}
for(i=0,angle=Math.PI*2/len1;i<len1;i++)
{
arr[idx++]=Math.cos(angle*i)*radius;
arr[idx++]=Math.sin(angle*i)*radius;
arr[idx++]=radius*(0.162+(i&1)*0.025);
}
for(i=0,angle=Math.PI*2/len1;i<len1;i++)
{
arr[idx++]=Math.cos(angle*i)*radius;
arr[idx++]=Math.sin(angle*i)*radius;
arr[idx++]=radius*(0.187-(i&1)*0.025);
}
for(i=0,radius1=radius*0.25,angle=Math.PI*2/len;i<len;i++)
{
arr[idx++]=Math.cos(angle*i)*radius1;
arr[idx++]=Math.sin(angle*i)*radius1;
arr[idx++]=radius*0.8;
}
arr[idx++]=0;
arr[idx++]=0;
arr[idx++]=radius;
function rotate(angleX,angleY)
{
var cX=Math.cos(angleX),
sX=Math.sin(angleX),
cY=Math.cos(angleY),
sY=Math.sin(angleY),
x1,y1,z1,
i=0,len=arr.length;
for(;i<len;i+=3)
{
x1=cY*arr[i]-sY*arr[i+2],
z1=cY*arr[i+2]+sY*arr[i],
y1=cX*arr[i+1]-sX*z1;
z1=cX*z1+sX*arr[i+1];
arr[i]=x1;
arr[i+1]=y1;
arr[i+2]=z1;
}
}
function setPerspective(){
for(var i=0,scale,len=arr.length;i<len;i+=3)
{
scale=fl/(fl+arr[i+2]);
move[i]=arr[i]*scale;
move[i+1]=arr[i+1]*scale;
}
}
function draw(arr){
var idx=0,st=len*3*2+len1*3*2;
g.clearRect(0,0,W,H);
g.save();
g.translate(cx,cy);
g.beginPath();
g.moveTo(arr[idx++],arr[idx++]);
idx++;
for(i=1;i<len;i++)
{
g.lineTo(arr[idx++],arr[idx++]);
idx++;
}
g.closePath();
g.stroke();
g.beginPath();
g.moveTo(arr[0],arr[1]);
for(i=0;i<len-1;i++)
{
g.lineTo(arr[idx++],arr[idx++]);
g.lineTo(arr[idx-len*3+1],arr[idx-len*3+2]);
idx++;
}
g.lineTo(arr[idx++],arr[idx++]);
idx++;
g.closePath();
g.stroke();
g.beginPath();
g.moveTo(arr[idx++],arr[idx++]);
idx++;
for(i=1;i<len1;i++)
{
g.lineTo(arr[idx++],arr[idx++]);
idx++;
}
g.closePath();
g.stroke();
idx-=len1*3;
g.beginPath();
g.moveTo(arr[idx-3],arr[idx-2]);
g.lineTo(arr[idx],arr[idx+1]);
for(i=0;i<len1;i++)
{
if(i&1)
{
idx+=3;
}
else
{
if(i%4)
{
g.moveTo(arr[idx++],arr[idx++]);
}
else
{
g.moveTo(arr[len*3+((i-1)/4|0)*3],arr[len*3+((i-1)/4|0)*3+1]);
g.lineTo(arr[idx++],arr[idx++]);
}
g.lineTo(arr[len*3+(i/4|0)*3],arr[len*3+(i/4|0)*3+1]);
idx++;
}
}
g.stroke();
g.beginPath();
g.moveTo(arr[idx++],arr[idx++]);
idx++;
for(i=1;i<len1;i++)
{
g.lineTo(arr[idx++],arr[idx++]);
idx++;
}
g.closePath();
g.stroke();
idx-=len1*3;
g.beginPath();
g.moveTo(arr[st-6],arr[st-5]);
g.lineTo(arr[st],arr[st+1]);
for(i=0;i<len1;i++)
{
if(i&1)
{
idx+=3;
}
else
{
if(i%4)
{
g.moveTo(arr[st++],arr[st++]);
g.lineTo(arr[idx++],arr[idx++]);
st===total-4||g.lineTo(arr[++st],arr[st+1]);
}
else
{
g.moveTo(arr[idx++],arr[idx++]);
g.lineTo(arr[total-3],arr[total-2]);
}
idx++;
}
}
g.stroke();
g.restore();
}
console.log(typeof cvs.onmousemove==="undefined"?"touchstart":"mousemove");
cvs.addEventListener(typeof cvs.onmousemove==="undefined"?"touchstart":"mousemove",function(e){
var crd=document.body.getBoundingClientRect();
e.type=="touchstart"&&(e=e.touches[0]);
angleY=e.clientX-crd.left-cx>0?0.005:-0.005;
angleX=e.clientY-crd.top-cy>0?0.005:-0.005;
},false);
rotate(-1.62,angleY);
(function drawFrame(){
rotate(angleX,angleY);
setPerspective();
draw(move);
run(drawFrame);
})();
}
diamond(W/2,H/2,Math.max(120,Math.min(W,H)/4),document.querySelector("canvas"));
//]]>
</script>
</body>
</html>

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[HTML5/CSS3] canvas之钻石

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