Hello, i just tried both hints, both work. Awesome, thanks a lot.
Best regards, Torsten. Am Samstag, 18. April 2009 13:03:41 schrieb Jon Burgess: > On Sat, 2009-04-18 at 09:39 +0200, Torsten Mohr wrote: > > Hello, > > > > thanks a lot for these explanations. That link to the XML descriptions > > was very useful. > > > > 1. > > Another question, is it possible to create PNGs with alpha support? > > I'd like the background to be "invisible", so i can overlay a map onto > > another image. Or do i need to replace the background value in the > > map with an "invisible" pixel with an external tool? > > Set the map bgcolor to "transparent". Note that does not work when > rendering to "png256" output, normal png output is OK. > > > 2. > > Also, i try to get the scale() and scale_denominator() of the map. > > I wonder why it is NEGATIVE (below zero): > > > > print "scale", m.scale() > > print "denom", m.scale_denominator() > > > > ---> > > scale -0.000333333333333 > > denom -1.19047619048 > > > > I use a slightly modified version of OSMs generate_image.py with > > these map values: > > > > ll = (4.5, 46, 16, 56) # Deutschland > > # ll = (-180.0, -90.0, 180.0, 90.0) # Welt > > z = 10 > > imgx = 300 * z > > imgy = 400 * z > > > > m = Map(imgx, imgy) > > Try placing the two print lines after the m.zoom_to_box() line. > Otherwise I think you are getting uninitialised data being returned. > I see: > > scale 256.034828825 > denom 914410.102945 > > Jon _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
