Hi everybody.
I'm using python mapscript bindings to draw my feature (wkt) on "base
layer" - this one is TMS available via GDAL minidriver.
What i want to get is custom size image of my feature drawn on the
background of "base layer".
Mapscript i use is like this:
1. shape=shapeObj.fromWKT(elements.wkt)
2. layer = mapobj.getLayerByName(layername)
3. layer.addFeature(shape)
4. extent=shape.bounds
5. mapobj.setExtent(extent.minx, extent.miny, extent.maxx, extent.maxy)
6. mapobj.draw()
Mapfile and minidriver code is here:
http://www.olpiny.pl/ump.map
http://www.olpiny.pl/frmt_wms_ump_tms.xml
This works almost well, map is drawn, but "base layer" is resampled, and
due to this image is a little distorted:
http://www.olpiny.pl/000000001354.png
I was playing with several resampling processing options (you can see it
in mapfile), but after rethinking my problem i think i know the reason:
I set more or less random extent (line 5), and it will not be multiple
size of basemap tiles, and it has to be scaled somehow to my custom
image size, so base layer will be resampled almost always.
I think i should calculate extent basing on extent fo my feature, and
size of my image somehow, to ensure that base layer will not be rescaled.
Any ideas how to solve this problem?
Thanx in advance guys.
--
Bartek Radwan
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