code: package gr.uom.java.ast.visualization;
  
  import org.eclipse.swt.graphics.Point;
  import org.eclipse.swt.graphics.Rectangle;
  
  /**
   * Information provider interface to get information about elements under the mouse cursor.
   * This interface is analog to {@link org.eclipse.jface.text.information.IInformationProvider} in
   * {@link org.eclipse.jface.text.information.InformationPresenter}.
   */
  public interface IInformationProvider {
  
  	/**
  	 * Returns information about the element at the specified location.
  	 * The information returned is used to display an appropriate tooltip.
  	 * @param location the location of the element (the coordinate is in the receiver's coordinate system)
  	 * @return information about the element, or <code>null</code> if none is available
  	 */
  	PMClassFigure getInformation(Point location);
  
  	/**
  	 * Returns the area of the element at the specified location.
  	 * The area returned is used to place an appropriate tooltip.
  	 * @param location the location of the element (the coordinate is in the receiver's coordinate system)
  	 * @return the area of the element, or <code>null</code> if none is available
  	 */
  	Rectangle getArea(Point location);
  }