Mapserver Color Binding: Blue and Green swapped (bug?)

[Milo van der Linden]

Extra note:

MapInfo uses a large integer to describe it's internaly used colors. 
Here is a C# function to convert MapInfo color code to RGB: as you can 
see, the MapInfo color code is in format BGR instead of RGB.

Maybe this has to do with your problem?


 private static Color miColorCodeToRGB(Int32 miColorCode)
    {
        Int32 iRed;
        Int32 iGreen;
        Int32 iBlue;
        Int32 _miColorCode;

        try
        {
        _miColorCode = miColorCode;

        //lColor = lColor \ &H100  'divide
        //iGreen = lColor Mod &H100 'get green component

        iRed = _miColorCode % 0x100;
        _miColorCode = _miColorCode / 0x100;
        iGreen = _miColorCode % 0x100;
        _miColorCode = _miColorCode / 0x100;
        iBlue = _miColorCode % 0x100;

            Color _Color = Color.FromArgb(255,iBlue, iGreen, iRed);
           
            return _Color;
        }
        catch
        {
            return Color.Transparent;
        }

Frank Warmerdam schreef:
> Delfos, Jacob wrote:
>> Hi List
>>
>> I am trying to make use of the colour binding feature, and it 
>> basically works, except... the colours are not quite right. My 
>> colours do not match those in MapInfo, although I can make MapInfo 
>> emulate the MapServer colours by swapping blue and green around. So 
>> basically: my RGB values are interpreted by MapServer as RBG.
>>
>> This happens for polygons as well as lines (haven't tried points). My 
>> data has been translated from MapInfo to PostGIS.
>>
>> I tried to lodge a bug in Trac, but it says "TICKET_CREATE privileges 
>> are required to perform this operation"
>>
>> Does anyone know more about this colour problem?
>
> Jacob,
>
> With some pointers from Howard, I found this segment of code in
> bindColorAttribute() in maputil.c:
>
>     attribute->red = atoi(tokens[0]);
>     attribute->blue = atoi(tokens[1]);
>     attribute->green = atoi(tokens[2]);
>
>
> I think this is responsible.  If you are building from source, try just
> changing it to the more obvious organization.  I'd also suggest you
> file a bug in Trac on the issue we will see if there is a subtle reason
> for this, or it's just a typo.
>
> To file bugs you need an OSGeo Userid.  The pointer to get an osgeo
> userid which you can use to login with is under the title "Important
> Notice" on the http://trac.osgeo.org/mapserver page.  The same userid
> can be used for other OSGeo services like subversion, and other
> trac instances (like GDAL's).
>
> Best regards,


-- 


	

Milo van der Linden
skype: milovanderlinden <skype:milovanderlinden?add>
mlinden at zeelandnet.nl <mailto:mlinden at zeelandnet.nl>
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milo at 3dsite.nl <mailto:milo at 3dsite.nl>
http://www.3dsite.nl

	  	

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