Yes, it pushed the result point one screen down. Just curious why this is
required.
From: Larry Becker
Sent: Thursday, April 09, 2009 9:09 PM
To: OpenJump develop and use
Subject: Re: [JPP-Devel] modelToViewTransform
Hi Bing,
I haven't studied this code for a while, but it seems like the line is moving
the origin (top for window coordinate system, bottom for world).
regards,
Larry
2009/4/9 Bing Ran <bing_...@hotmail.com>
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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