polygon_grid_test, a FORTRAN90 code which calls polygon_grid(), which generates a grid of points over the interior of a polygon in 2D.
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polygon_grid, a FORTRAN90 code which generates a grid of points over the interior of a polygon in 2D.
ELL is an L-shaped (non-convex!) polygon for which the program output doesn't look too bad, although the grid is degenerate.
QUAD is a quadrilateral polygon.
TRIANGLE is a triangular polygon.