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SRPG is a library that generates well-formed random polygons using a regular grid consisting of square cells.

It starts with axis & grid-aligned basic rectangular shapes, but can systematically manipulate them through repeated corner-cutting and perturbations to create a variety of polygonal and curve-like shapes, both on the grid and with offset/rotated orientations.

This library is based onMartin Held's Cimplementation.

SRPG is available as Maven/Gradle artifact viaJitpack.

SRPG accepts a variety of input arguments that affect shape geometry, providing a good level of customisation over the output. The following illustrations provide an idea of how each argument visually affects the random polygon:

Hierarchy	Diagonal	Perturb+align	Smooth

5x5	10x10	100x100	500x500