code: public final void viewLocalArea(final double x, final double y, final double width, final double height)
      {
          final Transform t = Transform.createViewportTransform(x, y, width, height, m_wide, m_high);
  
          if (t != null)
          {
              setTransform(t);
          }
      }
docs: Change the viewport's transform so that the specified area (in local or world coordinates)
  is visible.
  
  @param x
  @param y
  @param width
  @param height