[mapserver-dev] GD, filled ellipse,rendering: fill is bleedingoutside the outline

[Steve Lime]

A different algorithm is probably used to fill an ellipse as opposed
stroking the outline and you get the
off by 1 errors you've seen. I'm not sure how we'd work around it short
of making the outline circle 
larger?

Steve

>>> On 9/21/2009 at 9:51 AM, in message <4AB792F6.60805 at umb.no>, Havard
Tveite
<havard.tveite at umb.no> wrote:
> Sounds reasonable to assume that this is a GD bug.
> My Mapserver is using GD version 2.0.35, which should
> be the latest one.
> 
> Håvard
> 
> Steve Lime wrote:
>> It's a GD bug I imagine. Have you tried the latest version of that
lib?
>> 
>> Steve
>> 
>>>>> Havard Tveite <havard.tveite at umb.no> 09/21/09 4:14 AM >>>
>> When using GD, the fill of an outlined filled ellipse symbol
>> will "bleed" by one pixel several places outside of the
>> outline for most symbol sizes (Mapserver 5.4.2).  See the
>> attached (magnified) image.
>> (AGG does not seem to have this problem)
>> 
>> This seems to be a bug.  Has it been filed yet?
>> 
>> Here are the most relevant parts of the map file:
>> 
>>    SYMBOL
>>      NAME "circle"
>>      TYPE ellipse
>>      FILLED true
>>      POINTS
>>        1 1
>>      END
>>    END
>> 
>> ...
>> 
>>    LAYER    # Circle - outline
>>      NAME "circ"
>>      PROJECTION
>>        "init=epsg:32633"
>>      END
>>      TYPE POINT
>>      FEATURE
>>        POINTS
>>          50 800
>>        END
>>      END
>>      CLASS
>>        NAME "Circle"
>>        STYLE
>>          SYMBOL 'circle'
>>          SIZE 42
>>          COLOR 0 150 200
>>          OUTLINECOLOR 0 0 0
>>        END
>>      END
>>    END #layer circle - outline
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