Hi Maik,
[EMAIL PROTECTED] wrote:
can you give me a hint how I redraw only the affected area in Java? I was looking for
something like "invalidateRect" but I didn't found it.
You can call repaint(x,y,w,h) for your component.
The area to repaint would be a union of the old
selected rectangle and the new one.
You can also limit the number of repaints by only
issuing repaints if the dimensions of the area changed by
certain number of pixels so that you don't have to
respond to a flood of mouse moved events.
Currently I circumvent my problem by re-rendering the whole image. This works
better but is far from the performance with d3d=false and XOR rendering.
There shouldn't be that much of a difference really, if all you
do is paint an image. If your re-painting operation is very
expensive, you might want to cache it in an image (at least for
the duration of the zoom selection) and do further updates by copying
from that image. Many applications do this trick - they'd
do an initial zoom by scaling an image first, and then repainting
at higher resolution (with higher scale factor) later.
Thanks,
Dmitri
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