[Mapserver-users] Changing Colors in Map !!

[Stephen Woodbridge]

You raise a good issue. I don't usually display legends, but have used 
HTML Legend stuff that allows you a lot of control over your legends and 
I think you can eliminate layers on a named basis. which might work for you.

Please add a comment to the bug referenced below about this problem. I 
hope that the developers will tackle this problem but it helps to have a 
complete picture of the problem and issues and their work arounds.

-Steve W

Satyajit wrote:

> 
> Hi Steve,
>       Thanks a lot for the info. I have not tried your method yet but
> shall try it very soon. And let you know the result. I have a question
> in my mind though. When we add a dummy layer in our map and add classes
> to it ( to preserve the colors ..as you said), the layer will be shown
> in the legend in the browser. That dummy layer in the legend might
> confuse the end user as that layer's features won't be easily visible in
> the map and of course that layer doesn't have much meaning to it. Is
> there any way by which I can add that layer in my map file with all the
> classes but still make it invisible in the legend ? 
> Thanks a lot again steve.
> Shall get back to you after modifying my map file.
> 
> ~sat
> 
> Stephen Woodbridge wrote:
> 
> 
>>I think I may have created a feature and inserted a one pixel dot on 
>>the
>>map that gets covers by later layers. Play with it and if you have a 
>>problem let me know and I can dig through old mapfiles and find out
> 
> how 
> 
>>I did it.
> 
> 
> Here are some examples of preserving the colors in a symbol that were 
> changing. The big problem with this approach is that it uses up a lot of
> 
> layers, so you might try using one layer with lots of classes, but I'm 
> not sure it that will work.
> 
> The bug for this problem is:
>    http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=306
> I just updated it with this information.
> 
> ## dummy layer to protect symbol colors from changing
>    LAYER
>      NAME "color_symbol"
>      STATUS DEFAULT
>      TYPE point
>      TRANSFORM false
>      FEATURE
>        POINTS
>          1 1
>        END
>      END
>      CLASS
>        SYMBOL "color_symbol"
>        COLOR 0 0 0
>      END
>    END
> ## protect other colors
>    LAYER
>      NAME blue
>      STATUS DEFAULT
>      TYPE point
>      TRANSFORM false
>      FEATURE
>        POINTS
>          1 1
>        END
>      END
>      CLASS
>        COLOR 0 0 255
>      END
>    END
>    LAYER
>      NAME green
>      STATUS DEFAULT
>      TYPE point
>      TRANSFORM false
>      FEATURE
>        POINTS
>          1 1
>        END
>      END
>      CLASS
>        COLOR 8 206 107
>      END
>    END
> 
> 
> 
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