[Qgis-developer] color ramps for vector graduated symbols (ticket #782)

Tim Sutton tim at linfiniti.com
Wed Oct 31 22:19:51 EDT 2007


Are you guys familiar with MatLab? I was hoping we could at some point
implement a colour ramp editor similar to what they have. Also, it
would be great to include Peter Ersts (Raster maintainer) in this
process so we could use the same markup system in both raster and
vector implementations (where applicable).

The MatLab colour map editor is show here (scroll down a little for a screenie):




2007/10/25, Marco Hugentobler <marco.hugentobler at karto.baug.ethz.ch>:
> Hi Perrygeo,
> A flexible solution for color ramps as you describe it in ticket 782 would be
> a really great enhancement for qgis.
> >The remaining questions are:
> > - what file format works to define the color ramps? have to allow for all 4
> >of the above types. As much as possible, leverage existing formats like gmt
> >and grass color ramps.
>  >- how do the ramps get "registered" with qgis so that they can be made
> >available to the user?
> >- how do they get integrated with the UI? preferably a dropdown list of color
> >ramps with a small representative image of the ramp itself.
> > - how to we implement the algorithm to determine the rgb color for ramps of
> >type #1 and #2?
> Registered ramps could be stored in a dedicated directory under share/qgis,
> similar to the way it is done with the svg markers.
> Hopefully you can find a good storage format for the ramps. If there is no
> format that meets all your requirements, you could still design your own xml
> based language  (crml = color ramp markup language)
> Regards,
> Marco
> --
> Dr. Marco Hugentobler
> Institute of Cartography
> ETH Zurich
> Technical Advisor QGIS Project Steering Committee
> marco.hugentobler at karto.baug.ethz.ch
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Tim Sutton
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