Re: BufferedShapeLayer

Hi Chinh,

I just tried these changes, and was not able to see any different in
performance.

With copied graphics:

For ShapeLayer at scale 1.0E7, the time to render is: 76
For ShapeLayer at scale 1.0E7, the time to render is: 60
For ShapeLayer at scale 2.0E7, the time to render is: 52
For ShapeLayer at scale 4.0E7, the time to render is: 70
For ShapeLayer at scale 8.0E7, the time to render is: 196
For ShapeLayer at scale 1.6E8, the time to render is: 545
For ShapeLayer at scale 2.0488352E8, the time to render is: 541

Original:

For ShapeLayer at scale 1.0E7, the time to render is: 68
For ShapeLayer at scale 1.0E7, the time to render is: 43
For ShapeLayer at scale 2.0E7, the time to render is: 48
For ShapeLayer at scale 4.0E7, the time to render is: 72
For ShapeLayer at scale 8.0E7, the time to render is: 183
For ShapeLayer at scale 1.6E8, the time to render is: 542
For ShapeLayer at scale 2.0488352E8, the time to render is: 550
For ShapeLayer at scale 2.0488352E8, the time to render is: 571

Time is in milliseconds.

Do you have different performance numbers?

Cheers,

Don

On Thursday, August 2, 2001, at 04:12 PM, Chinh Tang wrote:

> Hey all,
>
> I found that BufferedShapeLayer repaints much faster if I create a copy
> of
> the Graphics object, paint on this buffer, then paint it back on the
> original Graphics object.
> Modified paint() is below. Is there a reason why this was not done
> before?
>
> -Chinh
>
> /**
> * Renders the layer on the map.
> *
> * @param g a graphics context
> */
> public void paint (Graphics g) {
> // grab local for thread safety
> OMGraphicList omg = omgraphics;
>
> Graphics g2 = g.create();
>
> if (omg != null){
> if (Debug.debugging("shape"))
> Debug.output("ShapeLayer.paint(): " + omg.size() +
> " omg" + " shadow=" + shadowX + "," + shadowY);
>
> if (shadowX != 0 || shadowY != 0){
> Graphics shadowG = g2.create();
> shadowG.translate(shadowX, shadowY);
> omg.render(shadowG);
> } else {
> omg.render(g2);
> }
> if (Debug.debugging("shape")){
> Debug.output("ShapeLayer.paint(): done");
> }
> }
> ((Graphics2D)g).draw(g2.getClip());
> g2.dispose();
> g.dispose();
> }
>
>
>
> --
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>

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