lw_dist2d_pt_ptarrayarc()

int lw_dist2d_pt_ptarrayarc	(	const POINT2D *	p,
		const POINTARRAY *	pa,
		DISTPTS *	dl
	)

Search all the arcs of pointarray to see which one is closest to p1 Returns minimum distance between point and arc pointarray.

Definition at line 1079 of file measures.c.

References DIST_MAX, DIST_MIN, DISTPTS::distance, getPoint2d_cp(), lw_dist2d_pt_arc(), lw_dist2d_pt_pt(), LW_FALSE, LW_TRUE, LWDEBUG, lwerror(), DISTPTS::mode, POINTARRAY::npoints, DISTPTS::tolerance, and DISTPTS::twisted.

Referenced by lw_dist2d_point_circstring(), and test_lw_dist2d_pt_ptarrayarc().

{
        int t;
        const POINT2D *A1;
        const POINT2D *A2;
        const POINT2D *A3;
        int twist = dl->twisted;

        LWDEBUG(2, "lw_dist2d_pt_ptarrayarc is called");

        if ( pa->npoints % 2 == 0 || pa->npoints < 3 )
        {
                lwerror("lw_dist2d_pt_ptarrayarc called with non-arc input");
                return LW_FALSE;
        }

        if (dl->mode == DIST_MAX)
        {
                lwerror("lw_dist2d_pt_ptarrayarc does not currently support DIST_MAX mode");
                return LW_FALSE;
        }

        A1 = getPoint2d_cp(pa, 0);

        if ( ! lw_dist2d_pt_pt(p, A1, dl) )
                return LW_FALSE;

        for ( t=1; t<pa->npoints; t += 2 )
        {
                dl->twisted = twist;
                A2 = getPoint2d_cp(pa, t);
                A3 = getPoint2d_cp(pa, t+1);

                if ( lw_dist2d_pt_arc(p, A1, A2, A3, dl) == LW_FALSE )
                        return LW_FALSE;

                if ( dl->distance <= dl->tolerance && dl->mode == DIST_MIN )
                        return LW_TRUE; /*just a check if  the answer is already given*/

                A1 = A3;
        }

        return LW_TRUE;
}

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