script Language="javascript"br /
/****************** JS2D函数集  *******************br /
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  作者：neweroica    2003-3-28br /
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  CopyRight (C) 2003br /
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  在引用或转载时请保留此版权信息，谢谢!!!br /
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  本函数集可以单独存成一个js文件："JS2D.js"br /
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***************************************************/br /
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/************* 画点 **************br /
  x,y     点所在的屏幕坐标（像素）br /
  color   颜色（字符串值）br /
  size    大小（像素）br /
**********************************/br /
function drawDot(x,y,color,size){br /
  document.write("table border='0' cellspacing=0 cellpadding=0trtd style='position: absolute; left: "+(x)+"; top: "+(y)+";background-color: "+color+"' width="+size+" height="+size+"/td/tr/table")br /
}br /
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/************* 画直线 **************br /
  x1,y1   起点所在的屏幕坐标（像素）br /
  x2,y2   终点所在的屏幕坐标（像素）br /
  color   颜色（字符串值）br /
  size    大小（像素）br /
  style   样式br /
          =0    实线br /
          =1    虚线br /
          =2    虚实线br /
**********************************/br /
function drawLine(x1,y1,x2,y2,color,size,style){br /
  var i;br /
  var r=Math.floor(Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)));br /
  var theta=Math.atan((x2-x1)/(y2-y1));br /
  if(((y2-y1)0&&(x2-x1)0)||((y2-y1)0&&(x2-x1)0))br /
    theta=Math.PI+theta;br /
  var dx=Math.sin(theta);//alert(dx)br /
  var dy=Math.cos(theta);br /
  for(i=0;ir;i++){br /
    switch(style){br /
      case 0:br /
        drawDot(x1+i*dx,y1+i*dy,color,size);br /
        break;br /
      case 1:br /
        i+=size*2;br /
        drawDot(x1+i*dx,y1+i*dy,color,size);br /
        break;br /
      case 2:br /
        if(Math.floor(i/4/size)%2==0){br /
 &nbs

/br /
function drawOval(x,y,a,b,color,size,precision){br /
  var i;br /
  var iMax=2*Math.PI;br /
  var step=2*Math.PI/(precision*Math.sqrt(a*b)*4.5);br /
  for(i=0;iiMax;i+=step){br /
    drawDot(x+a*Math.cos(i),y+b*Math.sin(i),color,size);br /
  }br /
}br /
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/************* 画多边形 **************br /
  x,y     中心所在的屏幕坐标（像素）br /
  r       多边形外接圆半径（像素）br /
  n       多边形的边数br /
  color   颜色（字符串值）br /
  size    大小（像素）br /
  style   样式br /
          =0    实线br /
          =1    虚线br /
          =2    虚实线br /
**********************************/br /
function drawPoly(x,y,r,n,color,size,style){br /
  var i;br /
  var theta=Math.PI;br /
  var x1=x,y1=y-r,x2,y2;br /
  for(i=0;in;i++){br /
    theta-=(2*Math.PI/n);br /
    x2=x+r*Math.sin(theta);br /
    y2=y+r*Math.cos(theta);br /
    drawLine(x1,y1,x2,y2,color,size,style);br /
    x1=x2;br /
    y1=y2;//alert(x1+" "+y1)br /
  }br /
}br /
/scriptbr /
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scriptbr /
//****************** JS2D函数集示例  *******************br /
drawLine(20,20,300,20,"#0000cc",2,0);br /
drawLine(20,40,300,40,"#0000cc",2,1);br /
drawLine(20,60,300,60,"#0000cc",2,2);br /
drawFilledRect(20,80,300,200,"009900");br /
drawRect(20,220,220,320,"ff0000",2,0);br /
drawRect(240,220,440,320,"ff0000",2,1);br /
drawRect(460,220,660,320,"ff0000",2,2);br /
drawOval(250,450,120,50,"006600",1,1);br /
drawOval(250,650,120,120,"006600",2,0.5);br /
drawPoly(200,900,100,3,"ff8800",2,0);br /
drawPoly(400,900,100,4,"ff8800",2,1);br /
drawPoly(600,900,100,5,"ff8800",2,2);br /
drawPoly(200,1100,100,6,"ff8800",2,0);br /
drawPoly(400,1100,100,7,"ff8800",2,1);br /
drawPoly(600,1100,100,12,"ff8800",2,2);br /
/script