If you allow two passes, you can have all sorts of summarized values in
the template, to be used in the second pass, like Bart's actual extent
used for coloring. Doesn't look to difficult to implement to me, as long
as the two passes only get called when really necessary. I'm not sure if
performance is an issue for MapServer itself: if you really want high
performance, you should use the underlying format or database directly.
Jan
On 3-2-2010 17:02, Lime, Steve D (DNR) wrote:
How big a change would depend on the implementation. The brute force approach
where you simply loop through features once to compute ranges and then again to
draw would be probably pretty straight forward and driver independent. Wouldn't
be fast (but would be simple). Complexity would be added as you try and boost
performance by:
- allowing drivers to compute stats in their own way (e.g. add to the layer
API something like msLayerGetStats(...))
- caching geometries from a first pass through the shapes for the second
Steve
BTW The color ramp support needs to be cleaned up first. I think we scared the
originator of that code away when an RFC was originally put together.
-----Original Message-----
From: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Bart van den
Eijnden
Sent: Wednesday, February 03, 2010 5:12 AM
To: mapserver-users@lists.osgeo.org
Subject: [mapserver-users] colorramp and datarange on the fly?
Hi list,
is it possible to have a colorramp in Mapserver based on the min and max value
in the current extent?
So instead of predefining the min and max in DATARANGE, have Mapserver use the
min and max value of the dataset in the current extent?
If not, would it be an easy change or a very complex one?
Best regards,
Bart_______________________________________________
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