lw_dist2d_pt_ptarray()

int lw_dist2d_pt_ptarray	(	const POINT2D *	p,
		POINTARRAY *	pa,
		DISTPTS *	dl
	)

search all the segments of pointarray to see which one is closest to p1 Returns minimum distance between point and pointarray

Definition at line 1049 of file measures.c.

References DIST_MIN, DISTPTS::distance, getPoint2d_cp(), lw_dist2d_pt_pt(), lw_dist2d_pt_seg(), LW_FALSE, LW_TRUE, LWDEBUG, DISTPTS::mode, POINTARRAY::npoints, DISTPTS::tolerance, and DISTPTS::twisted.

Referenced by lw_dist2d_point_line(), and lw_dist2d_point_poly().

{
        int t;
        const POINT2D *start, *end;
        int twist = dl->twisted;

        LWDEBUG(2, "lw_dist2d_pt_ptarray is called");

        start = getPoint2d_cp(pa, 0);

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

        for (t=1; t<pa->npoints; t++)
        {
                dl->twisted=twist;
                end = getPoint2d_cp(pa, t);
                if (!lw_dist2d_pt_seg(p, start, end, dl)) return LW_FALSE;

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

        return LW_TRUE;
}

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