[flexcoders] Drawing in a Canvas subclass

Tue, 23 May 2006 16:46:46 -0700

Hi, I ran into a problem while trying to use the drawing API in a
subclass of the Canvas container.  See the code include below.

The class TestCanvasDrawing extends the Canvas container.  I attempt
to draw a line in the updateDisplayList method.  However when I see
the output only a small portion of the line is drawn in the top-left
corner.  The rest of the line seems to be clip by the background.

If I then set the alpha property to 0.5 and then I can see the full
line drawn underneath the background.

So it seems that I'm getting a wrong graphics instance or I'm missing
some background configuration of the canvas.  Has anybody seen this
behavior or know what's the right usage?

thanks!
-Sergio


public class TestCanvasDrawing extends Canvas
{
private var _canvas : Canvas;

public function TestCanvasDrawing()
{
  super();
}

protected override function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void {
super.updateDisplayList(unscaledWidth, unscaledHeight);
//this.alpha = 0.5;  //Uncomment to see the line below.
this.graphics.lineStyle(5, 0xFF0000);
this.graphics.moveTo(0, 0)
this.graphics.lineTo(20, 20);
}

}






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