[mapserver-users] How do you display a symbol with two colours?

[geographika]

Ignore the last comment - this was due to OpenLayers clipping the 
tiles/symbols.

On 10/10/2012 09:30, Havard Tveite wrote:
> If you have moved to 6.2, you can consider using
> ANCHORPOINT
> http://mapserver.org/trunk/en/mapfile/symbol.html
>
> On earlier verions you could try the approach suggested
> in
> http://mapserver.org/trunk/en/mapfile/symbology/construction.html#tricks
>
> But that is kind of similar to what you have tried yourself.
> To avoid gaps you could try this:
>
> SYMBOL
>     NAME 'SQUARE_FULL'
>     TYPE vector
>     FILLED true
>     POINTS
>         0 0
>         0 1
>         1 1
>         1 0
>         0 0
>     END
> END
> SYMBOL
>     NAME 'SQUARE_R'
>     TYPE vector
>     FILLED true
>     POINTS
>         0.5 0
>         1 0
>         1 1
>         0.5 1
>         0.5 0
>     END
> END
>
> CLASS
>     STYLE
>         SYMBOL "SQUARE_FULL"
>         COLOR [LEFT_CLR]
>         SIZE 10
>     END
>     STYLE
>         SYMBOL "SQUARE_R"
>         COLOR [RIGHT_CLR]
>         SIZE 10
>     END
>  END
>
> It seemed to work for me on 6.0.
>
> Håvard
>
> On 10/9/2012 10:32 PM, geographika wrote:
>>   Hi,
>>
>> I'm trying to draw a point layer, with each point represented in two 
>> colours (for example a square split in two with one half red and one 
>> half green).
>> I can create the symbols and apply the data but either the squares 
>> are the incorrect shape, or they overlap. The closest I got was with 
>> the following CLASS definition, but then it appeared the colours were 
>> shown on the wrong side of the square.
>> Images and further details at 
>> http://gis.stackexchange.com/questions/35283/mapserver-symbol-with-two-colours
>> Symbol definitions:
>>
>> |SYMBOL
>>         NAME 'SQUARE_L'
>>         TYPE vector
>>         FILLED true
>>         POINTS
>>                 0 0
>>                 0 1
>>                 0.5 1
>>                 0.5 0
>>                 0 0
>>         END
>> END
>> SYMBOL
>>         NAME 'SQUARE_R'
>>         TYPE vector
>>         FILLED true
>>         POINTS
>>                 0.5 0
>>                 1 0
>>                 1 1
>>                 0.5 1
>>                 0.5 0
>>         END
>> END
>>
>> # CLASS definition
>>
>>
>>
>>
>> I'd like to symbolise a point dataset with a square (or circle) using 
>> two colours. This is useful for displaying values collected on both 
>> sides of a road (for example).
>>
>> split symbols
>>
>> I created two symbols, a left side and right side of the square as 
>> shown below:
>>
>> SYMBOL
>>      NAME 'SQUARE_L'
>>      TYPE vector
>>      FILLED true
>>      POINTS
>>          0 0
>>          0 1
>>          0.5 1
>>          0.5 0
>>          0 0
>>      END
>> END
>> SYMBOL
>>      NAME 'SQUARE_R'
>>      TYPE vector
>>      FILLED true
>>      POINTS
>>          0.5 0
>>          1 0
>>          1 1
>>          0.5 1
>>          0.5 0
>>      END
>> END
>>
>> Then in my LAYER I can create a CLASS using the two different STYLES:
>>
>> CLASS
>>      STYLE
>>          SYMBOL"SQUARE_L"
>>          COLOR [LEFT_CLR]
>>          SIZE 10
>>      END
>>      STYLE
>>          SYMBOL"SQUARE_R"
>>          COLOR [RIGHT_CLR]
>>          SIZE 10
>>      END
>>   END
>>
>>
>> |
>>
>> Any help appreciated,
>>
>> Seth
>>
>>
>>
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>