i_overlay 6.0.0

Boolean Operations for 2D Polygons: Supports intersection, union, difference, xor, and self-intersections for all polygon varieties.
Documentation 
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#[cfg(test)]
mod tests {
    use i_float::int::point::IntPoint;
    use i_overlay::core::fill_rule::FillRule;
    use i_overlay::core::overlay::{Overlay, ShapeType};
    use i_overlay::core::overlay_rule::OverlayRule;
    use i_overlay::vector::edge::VectorEdge;

    #[test]
    fn test_0() {
        let subj = [
            IntPoint::new(-10240, -10240),
            IntPoint::new(-10240, 10240),
            IntPoint::new(10240, 10240),
            IntPoint::new(10240, -10240),
        ];

        let clip = [
            IntPoint::new(-5120, -5120),
            IntPoint::new(-5120, 5120),
            IntPoint::new(5120, 5120),
            IntPoint::new(5120, -5120),
        ];

        let mut overlay = Overlay::new(2);
        overlay.add_contour(&subj, ShapeType::Subject);
        overlay.add_contour(&clip, ShapeType::Clip);

        let shapes = overlay.build_shape_vectors(FillRule::NonZero, OverlayRule::Subject);

        assert_eq!(shapes.len(), 1);
        assert_eq!(shapes[0].len(), 1);

        let vectors = &shapes[0][0];
        let template = [
            VectorEdge {
                a: IntPoint::new(-10240, 10240),
                b: IntPoint::new(-10240, -10240),
                fill: 1,
            },
            VectorEdge {
                a: IntPoint::new(-10240, -10240),
                b: IntPoint::new(10240, -10240),
                fill: 1,
            },
            VectorEdge {
                a: IntPoint::new(10240, -10240),
                b: IntPoint::new(10240, 10240),
                fill: 1,
            },
            VectorEdge {
                a: IntPoint::new(10240, 10240),
                b: IntPoint::new(-10240, 10240),
                fill: 1,
            },
        ];

        assert_eq!(vectors.as_slice(), template.as_slice());
    }

    #[test]
    fn test_1() {
        let subj = [
            IntPoint::new(-10240, -10240),
            IntPoint::new(-10240, 10240),
            IntPoint::new(10240, 10240),
            IntPoint::new(10240, -10240),
        ];

        let clip = [
            IntPoint::new(-5120, -5120),
            IntPoint::new(-5120, 15360),
            IntPoint::new(15360, 15360),
            IntPoint::new(15360, -5120),
        ];

        let mut overlay = Overlay::new(2);
        overlay.add_contour(&subj, ShapeType::Subject);
        overlay.add_contour(&clip, ShapeType::Clip);

        let shapes = overlay.build_shape_vectors(FillRule::NonZero, OverlayRule::Difference);

        assert_eq!(shapes.len(), 1);
        assert_eq!(shapes[0].len(), 1);

        let vectors = &shapes[0][0];
        let template = [
            VectorEdge {
                a: IntPoint::new(-10240, 10240),
                b: IntPoint::new(-10240, -10240),
                fill: 1,
            },
            VectorEdge {
                a: IntPoint::new(-10240, -10240),
                b: IntPoint::new(10240, -10240),
                fill: 1,
            },
            VectorEdge {
                a: IntPoint::new(10240, -10240),
                b: IntPoint::new(10240, -5120),
                fill: 1,
            },
            VectorEdge {
                a: IntPoint::new(10240, -5120),
                b: IntPoint::new(-5120, -5120),
                fill: 11,
            },
            VectorEdge {
                a: IntPoint::new(-5120, -5120),
                b: IntPoint::new(-5120, 10240),
                fill: 11,
            },
            VectorEdge {
                a: IntPoint::new(-5120, 10240),
                b: IntPoint::new(-10240, 10240),
                fill: 1,
            },
        ];

        assert_eq!(vectors.as_slice(), template.as_slice());
    }
}