lw_dist2d_point_poly()

int lw_dist2d_point_poly	(	LWPOINT *	point,
		LWPOLY *	poly,
		DISTPTS *	dl
	)

1. see if pt in outer boundary. if no, then treat the outer ring like a line
2. if in the boundary, test to see if its in a hole. if so, then return dist to hole, else return 0 (point in polygon)

Definition at line 646 of file measures.c.

{
        const POINT2D *p = getPoint2d_cp(point->point, 0);
 
        /* Max distance? Check only outer ring.*/
        if (dl->mode == DIST_MAX)
                return lw_dist2d_pt_ptarray(p, poly->rings[0], dl);
 
        /* Return distance to outer ring if not inside it */
        if (ptarray_contains_point(poly->rings[0], p) == LW_OUTSIDE)
                return lw_dist2d_pt_ptarray(p, poly->rings[0], dl);
 
        /*
         * Inside the outer ring.
         * Scan though each of the inner rings looking to
         * see if its inside.  If not, distance==0.
         * Otherwise, distance = pt to ring distance
         */
        for (uint32_t i = 1; i < poly->nrings; i++)
                if (ptarray_contains_point(poly->rings[i], p) != LW_OUTSIDE)
                        return lw_dist2d_pt_ptarray(p, poly->rings[i], dl);
 
        /* Is inside the polygon */
        dl->distance = 0.0;
        dl->p1.x = dl->p2.x = p->x;
        dl->p1.y = dl->p2.y = p->y;
        return LW_TRUE;
}

References DIST_MAX, DISTPTS::distance, getPoint2d_cp(), lw_dist2d_pt_ptarray(), LW_OUTSIDE, LW_TRUE, DISTPTS::mode, LWPOLY::nrings, DISTPTS::p1, DISTPTS::p2, LWPOINT::point, ptarray_contains_point(), LWPOLY::rings, POINT2D::x, and POINT2D::y.

Referenced by lw_dist2d_distribute_bruteforce().

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