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[XNA] filled polygon

eprime

Hi,
I need to create filled polygon at runtime for collisions

ShapeType.Filled is commented but seems not exists, please can implement it?
or is better draw with skeleton?

what the best way?

regards
Cristian Zerbinati

Mario

Sorry, that comment is wrong. The class ShapeRenderer is a minimal port of the corresponding libGDX implementation and does not support filled shapes.

The code responsible for whether the shapes are drawn as lines or filled polygons is here:
https://github.com/EsotericSoftware/spine-runtimes/blob/44e9a0e5c393dfa73cd6990c8049c11a25b5ae5c/spine-xna/src/ShapeRenderer.cs#L159

Just changing PrimitiveType.LineList to PrimitiveType. TriangleList won't work though, as the methods Line, Circle, Triangle and Polygon all construct lists of lines, not lists of triangles. Drawing arbitrary convex polygons is non-trivial, as we'd have to decompose the polygon into triangles. I'm afraid we won't add that functionality any time soon, as we need to finish porting the 4.0 runtimes.

eprime

Hi Mario,
ok no problem, I understand that polygon triangulation is not trivial, and mine is not an urgent request

in FarseerPhysics there is Triangulation class FarseerPhysics.Common.Decomposition that use great algorithm like
Earclip
Bayazit
Flipcode
Seidel
SeidelTrapezoids
Delauny

and Delaunay seem to be the best

Hey Mario, but inside csharp runtime you just have a class Triangulator :think:

OK I have implemented in my code the Triangulation Algorithm finded inside Farseer, then I solved :-)

Mario

Cool! Yes, we have a triangulator in the spine-csharp sources. It still takes some time to implement this nicely, so batching etc. isn't broken.