[Mapserver-users] Bug 663 (Re: Clarifications about mapscript 4.2)

[Eric Bridger]

On Thu, 2004-05-13 at 13:19, Sean Gillies wrote:
> 
> Eric, add your email to the tracker if you want to follow this
> 
> http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=663
> 
> I've figured it out.  Has to do with the MapServer "pens", when setting
> style colors we are not resetting the value of pens, hence the set color
> appears to stick.  The following works:
> 
>      def testDrawPoints(self):
>          points = [mapscript.pointObj(-0.2, 51.5),
>                    mapscript.pointObj(0.0, 51.0),
>                    mapscript.pointObj(0.2, 51.5)]
>          colors = [mapscript.colorObj(255,0,0),
>                    mapscript.colorObj(0,255,0),
>                    mapscript.colorObj(0,0,255)]
>          img = self.mapobj1.prepareImage()
>          layer = self.mapobj1.getLayerByName('POINT')
>          class0 = layer.getClass(0)
>          for i in range(len(points)):
>              style0 = class0.getStyle(0)
>              style0.color = colors[i]
>              style0.color.pen = -4
>              assert style0.color.toHex() == colors[i].toHex()
>              points[i].draw(self.mapobj1, layer, img, 0, "foo")
>          img.save('test_draw_points.png')
> 
> and results in red, green, and blue points.  I'm going to find a 
> solution
> that's better than explicitly setting the pen attribute of a color.
> 
> cheers,
> Sean

Thanks Sean! Not only figures out the bug but provides a work-around! 
The beauty of open source.

I guess setRGB() is an obvious place to set color.pen = MS_PEN_UNSET. I
guess the color constructor could also, if RGB parameters are present.