Curious Symbol Structure
m.meier at SPIEKERMANN.DE
Wed Dec 27 01:28:42 EST 2006
I am interested in an answer on this question from an expert, too.
What I hope I understood from many little parts of information is:
Specially for drawing thick line (line width > 1) you need a "pen". And
think of the tip of the pen as being a circle or en ellipse. So your
thick line is drawn by putting many ellipses one after another.
A long time ago I read in a documentation for the "old" GKS about an
optimization algorithm. Because you don't need to calculate the whole
ellipse for each step.
I hope, this explanation has some truth in it!
Bill Thoen schrieb:
> I'm trying to learn the MapServer lore and now I'm focusing on symbols. Can
> anyone tell me what the logic is where one is defining a _line_ style by
> using a TYPE of ELLIPSE (instead of LINE) and POINTS definition of one (x
> y) as in the symbol definition below? (This is from
> NAME 'dashed1'
> TYPE ELLIPSE
> POINTS 1 1 END
> FILLED true
> STYLE 10 5 5 10 END
> I'm just curious. This seems like some historical artifact from the days
> when learning MapServer was hard. ;-)
> The TYPE ELLIPSE seems especially weird to me. Why not TYPE LINE?
> - Bill Thoen
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