今天好奇绘制玫瑰花的过程，摘录如下：
<html> <head> <title>玫瑰花</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style type="text/css">#wangking {position:absolute; width:100%; height:100%; text-align:center;}</style> </head> <body> <div style="text-align:center"> <h1>一花一世界</h1> </div> <div id="wangking"> <canvas id="meiGuiImage"> </canvas> <script> let canvasTag = document.getElementById('meiGuiImage'); let drawEnv = canvasTag.getContext('2d'); with(m=Math) C=cos,S=sin,P=pow,R=random; canvasTag.width=canvasTag.height=f=500; h=-250; function printImage(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] } } function drawMeiGui() { for (i=0; i < 1e4; i++) { if (s=printImage(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; drawEnv.fillStyle="rgb("+~(s[3]*h)+","+~(s[4]*h)+","+~(s[3]*s[3]*-80)+")"; drawEnv.fillRect(x,y,1,1); } } } } setInterval('drawMeiGui()', 0) </script> </div> </body> </html>
效果图如下：
