[mapserver-users] Polygon Outline Color Width Fade Howto?

[Stephen Woodbridge]

Thanks Joe,

Yeah, I eventually figured that out. I tried to use a circle gradient, 
but the circle overlaps at the start/end of the polygon making it darker 
there. You also have to render the polygon first as as a LINE to get the 
brush applied then again as a polygon to get the fill. You might be able 
to do it in one step, but I have not been able to get that to work.

I'm still playing with this to get the effect I want.

-Steve

Joe Bussell wrote:
> Can you use an image as a line brush, where the image is a gradient from 
> a dark point at the center to a light, nearly transparent shade?
> 
> Joe
> 
> 
> On Fri, Apr 11, 2008 at 3:11 PM, Stephen Woodbridge 
> <woodbri at swoodbridge.com <mailto:woodbri at swoodbridge.com>> wrote:
> 
>     Hi all,
> 
>     I want to render and island polygon with a big fat outline color in
>     a dark blue the fades in distance from the island. I'm using AGG and
>     I tried this:
> 
>      LAYER
>        NAME "Islands"
>        STATUS DEFAULT
>        DATA "coast"
>        TYPE POLYGON
>        LABELITEM "ISLAND"
>        LABELCACHE OFF
>        CLASS
>          STYLE
>            SYMBOL "circle"
>            OUTLINECOLOR 0 192 243
>            SIZE 20
>          END
>          STYLE
>            COLOR 242 239 233
>          END
>        END
>      END
> 
>     Which sort of works but there is very little fade.
> 
>     If I use:
> 
>          STYLE
>            OUTLINECOLOR 0 192 243
>            WIDTH 20
>          END
> 
>     I get horrible artifacts all along the outline. Is there a way to
>     control the amount of fade in the outline. Can I make a transparent
>     ball that fades with radius to achieve this?
> 
>     Thanks,
>      -Steve
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>