Hi list,
Recently I started introducing an image back buffer in the LayerViewPanel in my
project for the purpose creating a (another) flicker free panning tool. It was
the first thing I was planning to do when I started with OJ. So far I have made
nice progress.
Basically I have a back buffer in the LVP that is bigger than the viewport and
the RenderingManager and all the style renderer only render to the back buffer
and then the proper portion of the back buffer is copied to the LVP graphics.
Additionally the back buffer is used as a cache of the previous rendering
result and the final viewport display uses part of the back buffer instead of
rendering afresh to reduce flickering.
The preliminary effect of change is much appreciated by the CSRs in our call
center.
I'm still having issues converting geometries correctly and precisely in the
process though.
Now that I'm looking at the code of LVP.modelToViewTransform(...) I'm wondering
why this line is there:
modelToViewTransform.translate(0, panelHeight);
It seems to me these three lines are sufficient to convert a model point to a
view point.
modelToViewTransform.scale(1, -1);
modelToViewTransform.scale(scale, scale);
modelToViewTransform.translate(-originInModel.getX(), -originInModel.getY());
or even:
modelToViewTransform.scale(scale, -scale);
modelToViewTransform.translate(-originInModel.getX(), -originInModel.getY());
Can someone share insight with this?
Thanks
Bing
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