README.md

Polybool

1. This package is now on pub.dev: https://pub.dev/packages/polybool

2. Null saftey is now supported thanks to @ignatz

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

Resources

Note: taken from original libaray polybooljs

• Demo + Animation
• Companion Tutorial

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)Code

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);