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 1137 of file measures.c.

{
        uint32_t 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;
}

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().

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