Re: [Geotools-devel] export format for freehand map decorations

[Andrea A. <aa...@op...>]

andrea antonello ha scritto:
> Hi, I find myself in the position to have to decide on how to export
> freehand drawn annotations from udig.
> Since I am no master of the formats-universe, I wanted to know if
> anyone knows what I should best use.
> I think this is the right list to ask for, please correct me if you
> find the word udig appears too often.
> 
> To explain:
> I have a plugin that draws freehand on a udig map layer. I have the
> possibility to change strokewidth and color/transparency.
> This gives me the possibility to really paint different strokes with
> different colors and to simulate fills by drawing.
> The drawing is saved into a H2 embedded database (not yet spatially
> though) and is CRS aware and is reprojected if needed.
> Also it is scale aware, keeps the width fixed for the scale at which
> it was drawn and scales with the zoom.
> 
> Now I have the problem to understand what to do it the user says "export layer".
> My first thought was svg, since it is a drawing. But then how to
> overlay it again over a map?

You'd loose crs information

> Shapefile doesn't seem to be a feasible choice.

Why not? You control the set of attributes no? So you can add columns 
with the line width, color and whatnot (I guess being a freehand you
don't have that many options, do you?). Pair it with a properly
crafted SLD and you're in business.

Cheers
Andrea