ptarrayarc_contains_point()

int ptarrayarc_contains_point	(	const POINTARRAY *	pa,
		const POINT2D *	pt
	)

For POINTARRAYs representing CIRCULARSTRINGS.

That is, linked triples with each triple being control points of a circular arc. Such POINTARRAYs have an odd number of vertices.

Return 1 if the point is inside the POINTARRAY, -1 if it is outside, and 0 if it is on the boundary.

Definition at line 1123 of file ptarray.c.

{
        int on_boundary = LW_FALSE;
        int intersections;
        if (!ptarray_is_closed_2d(pa))
                lwerror("%s called on unclosed ring", __func__);
 
        intersections = ptarrayarc_raycast_intersections(pa, pt, &on_boundary);
        if (on_boundary)
                return LW_BOUNDARY;
        else
                return (intersections % 2) ? LW_INSIDE : LW_OUTSIDE;
}

References LW_BOUNDARY, LW_FALSE, LW_INSIDE, LW_OUTSIDE, lwerror(), ptarray_is_closed_2d(), and ptarrayarc_raycast_intersections().

Referenced by lwgeom_contains_point(), and test_ptarrayarc_contains_point().

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