lwline_covers_lwpoint()

int lwline_covers_lwpoint	(	const LWLINE *	lwline,
		const LWPOINT *	lwpoint
	)

return LW_TRUE if any of the line segments covers the point

Definition at line 2740 of file lwgeodetic.c.

References edge_contains_point(), GEOGRAPHIC_EDGE::end, geographic_point_init(), getPoint2d_cp(), LW_FALSE, LW_TRUE, lwpoint_get_x(), lwpoint_get_y(), POINTARRAY::npoints, LWLINE::points, GEOGRAPHIC_EDGE::start, POINT2D::x, and POINT2D::y.

Referenced by lwgeom_covers_lwgeom_sphere(), and lwline_covers_lwline().

{
        int i;
        GEOGRAPHIC_POINT p;
        GEOGRAPHIC_EDGE e;

        for ( i = 0; i < lwline->points->npoints - 1; i++)
        {
                const POINT2D* a1 = getPoint2d_cp(lwline->points, i);
                const POINT2D* a2 = getPoint2d_cp(lwline->points, i+1);

                geographic_point_init(a1->x, a1->y, &(e.start));
                geographic_point_init(a2->x, a2->y, &(e.end));

                geographic_point_init(lwpoint_get_x(lwpoint), lwpoint_get_y(lwpoint), &p);

                if ( edge_contains_point(&e, &p) ) {
                        return LW_TRUE;
                }
        }

        return LW_FALSE;
}

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