用Javascript实现的3D玫瑰花效果代码

yaozheng   发布于 2016年08月02日   阅读次数: 508   我想说两句

Tag: js 玫瑰花

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>3D玫瑰花</title>
</head>
<body>
<canvas id="c" height="500" width="500"></canvas></div>
<script> 
var b = document.body;
var c = document.getElementsByTagName('canvas')[0];
var a = c.getContext('2d');
var canvas = document.getElementsByTagName('canvas')[0];
var ctx = canvas.getContext('2d');
document.body.clientWidth; 
with(m=Math)C=cos,S=sin,P=pow,R=random;
c.width=c.height=f=500;h=-250;
function p(a,b,c){
	if(c>60)
		return[S(a*7)*(13+5/(.2+P(b*4,4)))-S(b)*50,b*f+50,625+C(a*7)*(13+5/(.2+P(b*4,4)))+b*400,a*1-b/2,a];
	A=a*2-1;
	B=b*2-1;
	if(A*A+B*B<1)
	{
		if(c>37)
		{
			n=(j=c&1)?6:4;o=.5/(a+.01)+C(b*125)*3-a*300;
			w=b*h;
			return[o*C(n)+w*S(n)+j*610-390,o*S(n)-w*C(n)+550-j*350,1180+C(B+A)*99-j*300,.4-a*.1+P(1-B*B,-h*6)*.15-a*b*.4+C(a+b)/5+P(C((o*(a+1)+(B>0?w:-w))/25),30)*.1*(1-B*B),o/1e3+.7-o*w*3e-6]
		}
		if(c>32)
		{
			c=c*1.16-.15;o=a*45-20;w=b*b*h;z=o*S(c)+w*C(c)+620;
			return[o*C(c)-w*S(c),28+C(B*.5)*99-b*b*b*60-z/2-h,z,(b*b*.3+P((1-(A*A)),7)*.15+.3)*b,b*.7]
		}
		o=A*(2-b)*(80-c*2);
		w=99-C(A)*120-C(b)*(-h-c*4.9)+C(P(1-b,7))*50+c*2;z=o*S(c)+w*C(c)+700;
		return[o*C(c)-w*S(c),B*99-C(P(b, 7))*50-c/3-z/1.35+450,z,(1-b/1.2)*.9+a*.1, P((1-b),20)/4+.05]
	}
}
var draw = setInterval('for(i=0;i<1e4;i++)if(s=p(R(),R(),i%46/.74)){z=s[2];x=~~(s[0]*f/z-h);y=~~(s[1]*f/z-h);if(!m[q=y*f+x]|m[q]>z)m[q]=z,a.fillStyle="rgb("+~(s[3]*h)+","+~(s[4]*h)+","+~(s[3]*s[3]*-80)+")",a.fillRect(x,y,1,1)}',0);
function redraw(){
	draw = setInterval('for(i=0;i<1e4;i++)if(s=p(R(),R(),i%46/.74)){z=s[2];x=~~(s[0]*f/z-h);y=~~(s[1]*f/z-h);if(!m[q=y*f+x]|m[q]>z)m[q]=z,a.fillStyle="rgb("+~(s[3]*h)+","+~(s[4]*h)+","+~(s[3]*s[3]*-80)+")",a.fillRect(x,y,1,1)}',0);
}

function clear_canvas()
{
	ctx.clearRect(0,0,520,500);
}

function stop_draw(obj){
	clearInterval(obj);
}
</script>
 </body>
</html>