Hi Volker.

I am not sure whether this is what you asked for, or whether you had something else in mind.
In any case it may be handy: BG has an svg_mapper class for outputting geometries to svg format.
See http://www.boost.org/doc/libs/1_56_0/libs/geometry/doc/html/geometry/reference/io/svg/svg_mapper.html

I took your WKT, modified the example in the above page (see attached program), and produced the attached svg.

Apparently one of the two polygons has a self-intersection....

- m.


On 14/10/2014 11:41 πμ, Volker Schöch wrote:

Hi,

Do you have any recommendations for an online WKT plotter, or some small utility to run on a Windows machine?

 

I found

-       http://dev.openlayers.org/sandbox/docs/examples/wkt.html

-       http://arthur-e.github.io/Wicket/

but they seem to be strictly oriented towards geographic coordinates which makes it quirky to use with the kinds of coordinates I have in my system (would require some scaling).

 

The WKT I want to plot is the following (just to give you an idea):

MULTIPOLYGON(((1371 932,1371 789,3171 789,3171 2589,3156 1669,3156 1650,2262 1200,1371 932)),((1371 1672,2262 2160,1341 2589,1371 2589,1371 1672)))

 

This multi-polygon does not satisfy is_valid and in fact runs into an "Overlay invalid input exception" when used as a parameter to difference, but at first glance I cannot see why. I’ll plot it on paper for this time, but if you have a suggestion for a tool it would be very much appreciated.

 

Regards

   Volker

--
Volker Schöch | vschoech@think-cell.com
Senior Software Engineer


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