azimuth_pt_pt()

int azimuth_pt_pt	(	const POINT2D *	A,
		const POINT2D *	B,
		double *	d
	)

Compute the azimuth of segment AB in radians.

Return 0 on exception (same point), 1 otherwise.

Definition at line 2509 of file measures.c.

{
        if (A->x == B->x && A->y == B->y)
                return LW_FALSE;
        *d = fmod(2 * M_PI + M_PI / 2 - atan2(B->y - A->y, B->x - A->x), 2 * M_PI);
        return LW_TRUE;
}

References LW_FALSE, LW_TRUE, POINT2D::x, and POINT2D::y.

Referenced by _lwt_AddEdge(), _lwt_FindAdjacentEdges(), _lwt_InitEdgeEndByLine(), LWGEOM_angle(), LWGEOM_azimuth(), and lwt_GetFaceContainingPoint().

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