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
>
>
>
>
>
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by:
> High Quality Requirements in a Collaborative Environment.
> Download a free trial of Rational Requirements Composer Now!
> http://p.sf.net/sfu/www-ibm-com
> _______________________________________________
> Jump-pilot-devel mailing list
> Jump-pilot-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
>
>
--
http://amusingprogrammer.blogspot.com/
------------------------------------------------------------------------------
This SF.net email is sponsored by:
High Quality Requirements in a Collaborative Environment.
Download a free trial of Rational Requirements Composer Now!
http://p.sf.net/sfu/www-ibm-com
_______________________________________________
Jump-pilot-devel mailing list
Jump-pilot-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
