README.org

Java version of this Polygon Map Generator.

• The algorithems are mostly described here this page.
• The data structures are rather different. The mesh connectivity is separate from the generated map (elevation, rivers, biomes, etc.). The original project uses an “array of struct” approach whereas this one uses a “struct of arrays” approach (see explanation).
• The naming convention for the data is x_property_y where x and y are r, s, or t indicating the type of the input (x) and output (y). For example, t_downslope_s would be an array indexed by a t (triangle) id, and returning an s (side) id.
• The maps are created with 0 ≤ x ≤ 1000, 0 ≤ y ≤ 1000.

Below stuff is outdated:

Output

If your game needs polygon data:

let polygons = [];
for (let r = 0; r < map.mesh.numSolidRegions; r++) {
    polygons.push({
       biome: map.r_biome[r],
       vertices: map.mesh.r_circulate_t([], r)
                         .map((t) => map.t_pos([], t))
    });
}

If you want the noisy edges instead, see map.s_lines[s] for the line segments that should be used instead of side s.

If your game needs the polygons split into triangles:

let triangles = [];
for (let s = 0; s < map.mesh.numSolidSides; s++) {
    let r = map.mesh.s_begin_r(s),
        t1 = map.mesh.s_inner_t(s),
        t2 = map.mesh.s_outer_t(s);
    triangles.push({
       biome: map.r_biome[r],
       indices: [
          map.r_pos([], r),
          map.t_pos([], t1),
          map.t_pos([], t2),
       ]
    });
}

If your game needs the polygons split into tiles:

The map coordinates are 0 to 1000. Scale these to the desired size of the map. Use a polygon rasterization library like points-in-polygon to get a list of tiles for each polygon. I have not tried this yet.