create_v_line()

static LWGEOM * create_v_line ( const LWGEOM *  lwgeom, double  x, double  y, int32_t  srid  )

static

This function is used to create a vertical line used for cases where one if the geometries lacks z-values.

The vertical line crosses the 2d point that is closest and the z-range is from maxz to minz in the geometry that has z values.

Definition at line 93 of file measures3d.c.

{
 
        LWPOINT *lwpoints[2];
        GBOX gbox;
        int rv = lwgeom_calculate_gbox(lwgeom, &gbox);
 
        if (rv == LW_FAILURE)
                return NULL;
 
        lwpoints[0] = lwpoint_make3dz(srid, x, y, gbox.zmin);
        lwpoints[1] = lwpoint_make3dz(srid, x, y, gbox.zmax);
 
        return (LWGEOM *)lwline_from_ptarray(srid, 2, lwpoints);
}

References LW_FAILURE, lwgeom_calculate_gbox(), lwline_from_ptarray(), lwpoint_make3dz(), GBOX::zmax, and GBOX::zmin.

Referenced by lw_dist3d_distanceline(), and lw_dist3d_distancepoint().

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