lw_dist3d_pt_ptarray()

int lw_dist3d_pt_ptarray	(	POINT3DZ *	p,
		POINTARRAY *	pa,
		DISTPTS3D *	dl
	)

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

Definition at line 740 of file measures3d.c.

References DIST_MIN, DISTPTS3D::distance, getPoint3dz_p(), lw_dist3d_pt_seg(), LW_FALSE, LW_TRUE, LWDEBUG, DISTPTS3D::mode, POINTARRAY::npoints, DISTPTS3D::tolerance, and DISTPTS3D::twisted.

Referenced by lw_dist3d_point_line(), lw_dist3d_point_poly(), and lw_dist3d_pt_poly().

{
        int t;
        POINT3DZ        start, end;
        int twist = dl->twisted;

        LWDEBUG(2, "lw_dist3d_pt_ptarray is called");

        getPoint3dz_p(pa, 0, &start);

        for (t=1; t<pa->npoints; t++)
        {
                dl->twisted=twist;
                getPoint3dz_p(pa, t, &end);
                if (!lw_dist3d_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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