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burntiles: support MultiPolygon #50

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burntiles: support MultiPolygon #50

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8 changes: 8 additions & 0 deletions supermercado/burntiles.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,12 @@ def project_geom(geom):
"type": geom["type"],
"coordinates": mercantile.xy(*geom["coordinates"]),
}
elif geom["type"] == "MultiPolygon":
return {
"type": geom["type"],
"coordinates": [[[mercantile.xy(*coords) for coords in part]
for part in poly] for poly in geom["coordinates"]],
}


def _feature_extrema(geometry):
Expand All @@ -34,6 +40,8 @@ def _feature_extrema(geometry):
elif geometry["type"] == "Point":
x, y = geometry["coordinates"]
return x, y, x, y
elif geometry["type"] == "MultiPolygon":
x, y = zip(*[c for poly in geometry["coordinates"] for part in poly for c in part])

return min(x), min(y), max(x), max(y)

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