lw_pt_in_arc()

int lw_pt_in_arc	(	const POINT2D *	P,
		const POINT2D *	A1,
		const POINT2D *	A2,
		const POINT2D *	A3
	)

Returns true if P is on the same side of the plane partition defined by A1/A3 as A2 is.

Only makes sense if P has already been determined to be on the circle defined by A1/A2/A3.

Definition at line 91 of file lwalgorithm.c.

{
        int pt_side = lw_segment_side(A1, A3, P);
        int arc_side = lw_segment_side(A1, A3, A2);
        return pt_side == 0 || pt_side == arc_side;
}

References lw_segment_side().

Referenced by lw_dist2d_arc_arc(), lw_dist2d_circle_intersections(), lw_dist2d_pt_arc(), lw_dist2d_seg_arc(), and ptarrayarc_raycast_intersections().

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