polybool 0.2.0

Boolean operations on polygons (union, intersection, difference, xor).

Polybool

Boolean operations on polygons: union, intersection, difference, xor.

This library is based on:

• polybooljs by velipso@, which is based on
• polybool actionscript by akavel@, which is based on
• an implementation by Mahir Iqbal, which is based on
• F. Martinez' (2008) algorithm (Paper)

Features

1. Clips polygons for all boolean operations
2. Removes unnecessary vertices
3. Handles segments that are coincident (overlap perfectly, share vertices, one inside the other, etc)
4. Uses formulas that take floating point irregularities into account
5. Provides an API for constructing efficient sequences of operations

How to use it

    final poly1 = Polygon(regions: [
      [
        Coordinate(37.27935791015625, 29.32472016151103),
        Coordinate(37.122802734375, 29.257648503615542),
        Coordinate(37.22442626953125, 29.135369220927156),
        Coordinate(37.36175537109374, 29.221699149280646),
        Coordinate(37.27935791015625, 29.32472016151103),
      ],
    ]);

    final poly2 = Polygon(regions: [
      [
        Coordinate(37.104949951171875, 29.159357041355424),
        Coordinate(37.1722412109375, 29.046565622728846),
        Coordinate(37.31781005859375, 29.105376571809618),
        Coordinate(37.20794677734375, 29.216904948184734),
        Coordinate(37.104949951171875, 29.159357041355424),
      ]
    ]);

    final union = poly1.union(poly2);
    final intersection = poly1.intersect(poly2);
    final difference = poly1.difference(poly2);
    final inverseDifference = poly1.differenceRev(poly2);
    final xor = poly1.xor(poly2);

Resources

• Companion Tutorial