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Javascript+HTML5 canvas implements 3D effect code sharing of roses

巴扎黑Original: 2017-09-06 10:29:023922browse

本文实例讲述了javascript+HTML5的canvas实现七夕情人节3D玫瑰花效果。分享给大家供大家参考。具体如下：

下面的玫瑰绘制用到了HTML 5的canvas，所以你的浏览器需要支持HTML 5。个人还是比较推荐chrome，这个效果在Firefox下也会稍卡。

效果图：

具体代码如下：

&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd">
&lt;html>
 &lt;head>
 &lt;title>3D玫瑰花&lt;/title>
 &lt;meta name="Generator" content="EditPlus">
 &lt;meta name="Author" content="">
 &lt;meta name="Keywords" content="">
 &lt;meta name="Description" content="">
 &lt;/head>
 &lt;body>
 情人节快到了，这里送大家一枝玫瑰，无论是有对象还是没对象的朋友们，情人节快乐～
下面的玫瑰绘制用到了HTML 5的canvas，所以你的浏览器需要支持HTML 5。个人还是比较推荐chrome，这个效果在Firefox下也会稍卡。
&lt;p id="demo" style="width:520; height:500px;">&lt;canvas id="c" height="500" width="500">&lt;/canvas>&lt;/p>
&lt;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&lt;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&lt;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);
  var demo = document.getElementById("demo");
  function redraw(){
    /*
    var d_c = document.createElement("canvas");
    d_c.setAttribute("id","c");
    d_c.setAttribute("width","520");
    d_c.setAttribute("height","500");
    demo.appendChild(d_c);
    */
    draw = setInterval("for(i=0;i&lt;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);
    //alert(d_c);
  }
  function clear_canvas()
  {
    ctx.clearRect(0,0,520,500);
    //canvas.parentNode.removeChild(canvas);  //删除
  }
  function stop_draw(obj){
    clearInterval(obj);
  }
&lt;/script>
 &lt;/body>
&lt;/html>

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