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x0:¶¥µãºá×ø±ê
y0:¶¥µã×Ý×ø±ê
x1:ˮƽÏßÉÏÁíÒ»¶¥µãµÄºá×ø±ê
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 private function drawDottenRect(g:Graphics,
                   x0:Number,
                   y0:Number,
                   x1:Number,
                   y1:Number):void{
             
             drawDottedHorizontalLineTo(g,y0,x0,x1);
             drawDottedVerticalLineTo(g,x0,y0,y1);
             drawDottedHorizontalLineTo(g,y1,x1,x0);
             drawDottedVerticalLineTo(g,x1,y0,y1);
               
   }
   
   private  function drawDottedHorizontalLineTo(
    g:Graphics,
    y : Number,
    x0 : Number,
    x1 : Number
    ) : void
   {
    if( x0 < x1){
     g.moveTo(x0, y);
     for(var x:Number = x0 + start; x<x1; x+= dotLength + gap){
      if( x + dotLength + gap <= x1){
       g.lineTo(x + dotLength,y);
       g.moveTo(x + dotLength + gap, y);


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