Very cool. Looks like it is scheduled for inclusion in Release 5.4., and even better, the code is still functional. I'm playing around with it now, and am easily applying a gradient to a single range of values, but have not yet figured out how to apply different color gradients to different ranges.<br>
<br>Will keep working on it.<br><br>Thanks for the lead.<br>--<br><br><br><br><div class="gmail_quote">On Tue, Jan 13, 2009 at 2:02 PM, Frank Warmerdam <span dir="ltr"><<a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d">Roger André wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
This is probably a question for Frank W.. I'd like to re-write the raster classifier in Mapserver so that it can apply a linear color gradient using LUTs. I've got code written already to do this with the Python API to GDAL, and would like to be able to do the same thing in Mapserver. Can someone point me to the right C code?<br>
</blockquote>
<br></div>
Roger,<br>
<br>
The core of the existing classification logic is msGetClass() in mapraster.c.<br>
Also if you search on "classified" in mapdrawgdal.c you will see most<br>
of the places it gets used.<br>
<br>
I believe that ramp based gradients should be written up as an RFC. There<br>
was a previous effort which I think was partially implemented. I would<br>
suggest you dig up information on it, before going too far.<br>
<br>
<a href="http://mapserver.org/development/rfc/ms-rfc-6.html" target="_blank">http://mapserver.org/development/rfc/ms-rfc-6.html</a><br>
<br>
Best regards,<br><font color="#888888">
-- <br>
---------------------------------------+--------------------------------------<br>
I set the clouds in motion - turn up | Frank Warmerdam, <a href="mailto:warmerdam@pobox.com" target="_blank">warmerdam@pobox.com</a><br>
light and sound - activate the windows | <a href="http://pobox.com/%7Ewarmerdam" target="_blank">http://pobox.com/~warmerdam</a><br>
and watch the world go round - Rush | Geospatial Programmer for Rent<br>
<br>
</font></blockquote></div><br>