lw_dist3d_pt_ptarray()

int lw_dist3d_pt_ptarray	(	const POINT3DZ *	p,
		const 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 996 of file measures3d.c.

{
        uint32_t t;
        POINT3DZ start, end;
        int twist = dl->twisted;
        if (!pa)
                return LW_FALSE;
 
        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;
}

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

Referenced by lw_dist3d_point_line(), lw_dist3d_point_poly(), lw_dist3d_point_tri(), lw_dist3d_pt_poly(), and lw_dist3d_pt_tri().

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