lw_dist2d_curvepoly_curvepoly()

int lw_dist2d_curvepoly_curvepoly	(	LWCURVEPOLY *	poly1,
		LWCURVEPOLY *	poly2,
		DISTPTS *	dl
	)

Definition at line 974 of file measures.c.

{
        const POINT2D *pt;
        uint32_t i;
 
        LWDEBUG(2, "lw_dist2d_curvepoly_curvepoly called");
 
        /*1     if we are looking for maxdistance, just check the outer rings.*/
        if (dl->mode == DIST_MAX)
        {
                return lw_dist2d_recursive(poly1->rings[0],     poly2->rings[0], dl);
        }
 
 
        /* 2    check if poly1 has first point outside poly2 and vice versa, if so, just check outer rings
        here it would be possible to handle the information about which one is inside which one and only search for the smaller ones in the bigger ones holes.*/
        pt = lw_curvering_getfirstpoint2d_cp(poly1->rings[0]);
        if ( lwgeom_contains_point(poly2->rings[0], pt) == LW_OUTSIDE )
        {
                pt = lw_curvering_getfirstpoint2d_cp(poly2->rings[0]);
                if ( lwgeom_contains_point(poly1->rings[0], pt) == LW_OUTSIDE )
                {
                        return lw_dist2d_recursive(poly1->rings[0], poly2->rings[0], dl);
                }
        }
 
        /*3     check if first point of poly2 is in a hole of poly1. If so check outer ring of poly2 against that hole of poly1*/
        pt = lw_curvering_getfirstpoint2d_cp(poly2->rings[0]);
        for (i = 1; i < poly1->nrings; i++)
        {
                /* Inside a hole */
                if ( lwgeom_contains_point(poly1->rings[i], pt) != LW_OUTSIDE )
                {
                        return lw_dist2d_recursive(poly1->rings[i], poly2->rings[0], dl);
                }
        }
 
        /*4     check if first point of poly1 is in a hole of poly2. If so check outer ring of poly1 against that hole of poly2*/
        pt = lw_curvering_getfirstpoint2d_cp(poly1->rings[0]);
        for (i = 1; i < poly2->nrings; i++)
        {
                /* Inside a hole */
                if ( lwgeom_contains_point(poly2->rings[i], pt) != LW_OUTSIDE )
                {
                        return lw_dist2d_recursive(poly1->rings[0],     poly2->rings[i], dl);
                }
        }
 
 
        /*5     If we have come all the way here we know that the first point of one of them is inside the other ones outer ring and not in holes so we check which one is inside.*/
        pt = lw_curvering_getfirstpoint2d_cp(poly1->rings[0]);
        if ( lwgeom_contains_point(poly2->rings[0], pt) != LW_OUTSIDE )
        {
                dl->distance = 0.0;
                dl->p1.x = dl->p2.x = pt->x;
                dl->p1.y = dl->p2.y = pt->y;
                return LW_TRUE;
        }
 
        pt = lw_curvering_getfirstpoint2d_cp(poly2->rings[0]);
        if ( lwgeom_contains_point(poly1->rings[0], pt) != LW_OUTSIDE )
        {
                dl->distance = 0.0;
                dl->p1.x = dl->p2.x = pt->x;
                dl->p1.y = dl->p2.y = pt->y;
                return LW_TRUE;
        }
 
        lwerror("Unspecified error in function lw_dist2d_curvepoly_curvepoly");
        return LW_FALSE;
}

References DIST_MAX, DISTPTS::distance, lw_curvering_getfirstpoint2d_cp(), lw_dist2d_recursive(), LW_FALSE, LW_OUTSIDE, LW_TRUE, LWDEBUG, lwerror(), lwgeom_contains_point(), DISTPTS::mode, LWCURVEPOLY::nrings, DISTPTS::p1, DISTPTS::p2, LWCURVEPOLY::rings, POINT2D::x, and POINT2D::y.

Referenced by lw_dist2d_distribute_bruteforce(), and lw_dist2d_poly_curvepoly().

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