ta with the primitive. </td>
          </tr>
          <tr>
            <td style="font-family: Courier New,Courier,monospace;">bool
            <span style="font-weight: bold;">contains_point</span>()
const</td>
            <td>Returns true if the cell
contains a point site, else false.</td>
          </tr>
          <tr>
            <td style="font-family: Courier New,Courier,monospace;">bool
            <span style="font-weight: bold;">contains_segment</span>()
const</td>
            <td>Returns true if 