Re: [Geotools-devel] Rendering lines with a Graphic Stroke

[Brent O. <bre...@gm...>]

I would expect the graphics to act the way they are currently acting. An 
arrow is a special case, where you don't want part of the graphic to 
change (arrow head), but you want the rest to adjust (the line). I 
suggest making a special arrow type that will behave the way you want it 
to. Or, reversing the points and having a reversed arrow graphic.

Brent Owens
TOPP



Jesse Eichar wrote:

> I have a bit of a issue with lines drawn with a Graphic stroke.  I've 
> looked at the SLD specification on how it is supposed to be done and I 
> haven't really gotten a good answer but here is what it does and what 
> I think it should do:
>
> What it does:
> Between each set of coordinates the graphic is drawn.  If the distance 
> between the two coordinates is longer than the graphic then the 
> graphic is repeated until the space if filled up.  So far this is more 
> or less ok.  However if the distance between coordinates is less than 
> the length of the graphic then the graphic is clipped so that it 
> fits.  Because of this when you zoom out the graphic is 
> unrecognizable.  Image a line with an arrow.  If you zoom in the arrow 
> can be seen with no difficulty but if you zoom out it looks like a 
> line (the arrow is lost).
>
> What I expected:
> I expected the arrow to show up independent of what zoom level I am 
> at.  A weather map is a good point.  I have weather front with arrows 
> indicating the direction they are moving.  The direction the arrow 
> points is dependent on the order of the coordinates so a graphic stoke 
> would work perfectly... Unfortunately if I look at all of canada it 
> just looks like a line.  I  have to zoom in to see the arrows.  This 
> is not what is desired.
> I am going to make a new implementation of StyledShapePainter for my 
> use in this project.  And can add it to geotools if it is the 
> behaviour that other expect as well.  However if there is a better way 
> to do what I want please let me know before I do too much work.
>
> Thanks,
> Jesse
>
>
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