as画图

*两点间画直线   
                  *画螺旋线   
                  *画正方形、圆、椭圆   
                  *抛物线   
                  *正弦、余弦线                        
                     
                  使用方法：加到帧中就可   
                     
                     
                  //   画直线   
                  //   /   x1,   y1:   起点坐标   
                  //   x2,   y2:   终点坐标   
                  //   k是层次   
                  Movieclip.prototype.drawline   =   function(x1,   y1,   x2,   y2,   k)   {   
                     this.linestyle(1);   
                     this.moveTo(x1,   y1);   
                     this.lineTo(x2,   y2);   
                  };   
                  //   从(0,0)到(100,100)画一条线   
                  _root.createEmptyMovieClip("mc",   10);   
                  mc.drawline(0,   0,   100,   100);   
                  //   画螺旋线   
                  //   w、h为宽和高   
                  //   f控制线的长短，用弧度表示   
                  Movieclip.prototype.drawhelix   =   function(w,   h,   f)   {   
                     for   (var   i   =   0;   i<f;   i   +=   0.05)   {   
                        this.lineTo(x=Math.sin(i)*i*w,   y=Math.cos(i)*i*h);   
                        this.linestyle(1);   
                     }   
                  };   
                  //   以(100,100)为中心画螺旋线   
                  _root.createEmptyMovieClip("luo",   1);   
                  with   (luo)   {   
                     drawhelix(5,   5,   13);   
                     _x   +=   100;   
                     _y   +=   100;   
                  }   
                  //   多功能函数，可画圆，椭圆，正多边形等   
                  //   n为边数   
                  Movieclip.prototype.drawmany   =   function(w,   h,   n)   {   
                     f   =   2*Math.PI;   
                     for   (var   i   =   0;   i<=f/n*(n+1);   i   +=   f/n)   {   
                        this.lineTo(x=Math.sin(i)*w,   y=Math.cos(i)*h);   
                        this.linestyle(1);   
                     }   
                  };   
                  //   画一正五边形   
                  _root.createEmptyMovieClip("duobian",   2);   
                  with   (duobian)   {   
                     drawmany(50,   50,   5);   
                     _x   +=   250;   
                     _y   +=   100;   
                     //   5为多边形的边数，6.3为2pai   
                  }   
                  //   画一椭圆   
                  _root.createEmptyMovieClip("tuo",   3);   
                  with   (tuo)   {   
                     drawmany(25,   50,   100);   
                     _x   +=   400;   
                     _y   +=   100;   
                  }   
                  //   圆   
                  _root.createEmptyMovieClip("yuan",   4);   
                  with   (yuan)   {   
                     drawmany(50,   50,   100);   
                     _x   +=   400;   
                     _y   +=   300;   
                  }   
                  //   抛物线   
                  Movieclip.prototype.drawparabola   =   function(l,   r,   k)   {   
                     for   (var   i   =   -l;   i<=r;   i   +=   1)   {   
                        this.lineTo(x=i,   y=k*i*i);   
                        this.linestyle(1);   
                     }   
                  };   
                  //   调用   
                  _root.createEmptyMovieClip("parabola",   100);   
                  with   (parabola)   {   
                     drawparabola(50,   50,   0.05);   
                     _x   +=   200;   
                     _y   +=   200;   
                     //   顶点坐标   
                  }   
                  //   正弦线,余弦类似   
                  Movieclip.prototype.drawsin   =   function(n,   k)   {   
                     for   (var   i   =   0;   i<=90*n;   i   +=   1)   {   
                        this.lineTo(x=i,   y=k*Math.sin(i*Math.PI/180));   
                        this.linestyle(1);   
                     }   
                  };   
                  _root.createEmptyMovieClip("sin",   101);   
                  with   (sin)   {   
                     drawsin(4,   50);   
                     _x   +=   200;   
                     _y   +=   200;   
                     //   顶点坐标   
                  }   
                  Movieclip.prototype.drawwave   =   function(w,   h)   {   
                     for   (var   i   =   0;   i<=6.3;   i   +=   0.01)   {   
                        this.lineTo(x=w/Math.cos(i),   y=h*Math.sin(i)/Math.cos(i));   
                        this.linestyle(1);   
                     }   
                  };   
                  _root.createEmptyMovieClip("wave",   105);   
                  with   (wave)   {   
                     drawwave(100,   100);   
                     _x   +=   200;   
                     _y   +=   200;   
                     //   顶点坐标   
                  }