lw_dist2d_selected_seg_seg()

int lw_dist2d_selected_seg_seg	(	const POINT2D *	A,
		const POINT2D *	B,
		const POINT2D *	C,
		const POINT2D *	D,
		DISTPTS *	dl
	)

This is the same function as lw_dist2d_seg_seg but without any calculations to determine intersection since we already know they do not intersect.

Definition at line 2175 of file measures.c.

{
        /*A and B are the same point */
        if ((A->x == B->x) && (A->y == B->y))
        {
                return lw_dist2d_pt_seg(A, C, D, dl);
        }
        /*U and V are the same point */
 
        if ((C->x == D->x) && (C->y == D->y))
        {
                dl->twisted *= -1;
                return lw_dist2d_pt_seg(D, A, B, dl);
        }
 
        if ((lw_dist2d_pt_seg(A, C, D, dl)) && (lw_dist2d_pt_seg(B, C, D, dl)))
        {
                /* change the order of inputted geometries and that we notice by changing sign on dl->twisted */
                dl->twisted *= -1;
                return ((lw_dist2d_pt_seg(C, A, B, dl)) && (lw_dist2d_pt_seg(D, A, B, dl)));
        }
        else
                return LW_FALSE; /* if any of the calls to lw_dist2d_pt_seg goes wrong we return false*/
}

References lw_dist2d_pt_seg(), LW_FALSE, DISTPTS::twisted, POINT2D::x, and POINT2D::y.

Referenced by lw_dist2d_pre_seg_seg().

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