getPoint3dz_p()

int getPoint3dz_p ( const POINTARRAY *  pa, uint32_t  n, POINT3DZ *  point  )

extern

Definition at line 215 of file lwgeom_api.c.

{
        uint8_t *ptr;
 
        if ( ! pa )
        {
                lwerror("%s [%d] NULL POINTARRAY input", __FILE__, __LINE__);
                return 0;
        }
 
        //assert(n < pa->npoints); --causes point empty/point empty to crash
        if ( n>=pa->npoints )
        {
                lwnotice("%s [%d] called with n=%d and npoints=%d", __FILE__, __LINE__, n, pa->npoints);
                return 0;
        }
 
        LWDEBUGF(2, "getPoint3dz_p called on array of %d-dimensions / %u pts",
                 FLAGS_NDIMS(pa->flags), pa->npoints);
 
        /* Get a pointer to nth point offset */
        ptr=getPoint_internal(pa, n);
 
        /*
         * if input POINTARRAY has the Z, it is always
         * at third position so make a single copy
         */
        if ( FLAGS_GET_Z(pa->flags) )
        {
                memcpy(op, ptr, sizeof(POINT3DZ));
        }
 
        /*
         * Otherwise copy the 2d part and initialize
         * Z to NO_Z_VALUE
         */
        else
        {
                memcpy(op, ptr, sizeof(POINT2D));
                op->z=NO_Z_VALUE;
        }
 
        return 1;
 
}

References POINTARRAY::flags, FLAGS_GET_Z, FLAGS_NDIMS, getPoint_internal(), LWDEBUGF, lwerror(), lwnotice(), NO_Z_VALUE, POINTARRAY::npoints, and POINT3DZ::z.

Referenced by BOX3D_construct(), define_plane(), getPoint3dz(), lw_dist3d_point_line(), lw_dist3d_point_point(), lw_dist3d_point_poly(), lw_dist3d_point_tri(), lw_dist3d_pt_ptarray(), lw_dist3d_ptarray_poly(), lw_dist3d_ptarray_ptarray(), lw_dist3d_ptarray_tri(), lwline_measured_from_lwline(), lwpoint_getPoint3dz_p(), pt_in_ring_3d(), and ptarray_length().

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