[Qgis-developer] rendercontext-branch

[Marco Hugentobler]

Hi all,

Note that the render context branch is now in a stage where it can be tested.
You may check out the branch with: 
'svn co https://svn.osgeo.org/qgis/branches/rendercontext-branch 
qgis_rendercontext'

Regards,
Marco


>
> On Mon, Apr 7, 2008 at 6:11 PM, Hugentobler  Marco
>
> <marco.hugentobler at karto.baug.ethz.ch> wrote:
> > Hi devs,
> >
> >  I started a wiki page about the changes in the rendercontext branch:
> >  http://wiki.qgis.org/qgiswiki/RenderContextBranch
> >
> >  Although the work in the branch is not completely finished, it would be
> > good for me to have some feedback. The most important changes in the
> > branch are:
> >
> >  - QgsRenderContext object encapsulates rendering parameters and is
> > passed to all map layers - QgsRenderContext::mRenderingStopped is set to
> > true to notify the layers that rendering was canceled (with esc key or
> > check box) - QgsRenderContext::mScaleFactor allows to scale outline
> > widths and image sizes. This is important to allow QGIS main canvas and
> > print composer output to look the same. QgsMapRender now sets this
> > scaling factor such that units are always mm - Similarly,
> > QgsRenderContext::mRasterScaleFactor allows for different raster
> > resolutions. The problem is that some devices work with pixels as units
> > (e.g. QImage, QPixmap, widgets), but others work with logical units (e.g.
> > QGraphicsView). To allow for a correct resolution, raster layers and
> > point marker images are oversampled by mRasterScaleFactor and scaled down
> > afterwards.
> >
> >  Regards,
> >  Marco
> >
> >  _______________________________________________
> >  Qgis-developer mailing list
> >  Qgis-developer at lists.osgeo.org
> >  http://lists.osgeo.org/mailman/listinfo/qgis-developer
>
> Marco



-- 
Dr. Marco Hugentobler
Institute of Cartography
ETH Zurich
Technical Advisor QGIS Project Steering Committee