GroupFigure.java

/*
 * @(#)GroupFigure.java 5.1
 *
 */

package CH.ifa.draw.figures;

import java.awt.Point;
import java.awt.Rectangle;
import java.util.Vector;

import CH.ifa.draw.framework.FigureEnumeration;
import CH.ifa.draw.framework.Handle;
import CH.ifa.draw.standard.CompositeFigure;
import CH.ifa.draw.standard.FigureEnumerator;
import CH.ifa.draw.standard.RelativeLocator;

/**
 * A Figure that groups a collection of figures.
 */
public  class GroupFigure extends CompositeFigure {

	/*
	 * Serialization support.
	 */
	private static final long serialVersionUID = 8311226373023297933L;
	private int groupFigureSerializedDataVersion = 1;

   /**
	* GroupFigures cannot be connected
	*/
	public boolean canConnect() {
		return false;
	}

   /**
	* Gets the display box. The display box is defined as the union
	* of the contained figures.
	*/
	public Rectangle displayBox() {
		FigureEnumeration k = figures();
		Rectangle r = k.nextFigure().displayBox();

		while (k.hasMoreElements())
			r.add(k.nextFigure().displayBox());
		return r;
	}

	public void basicDisplayBox(Point origin, Point corner) {
		// do nothing
		// we could transform all components proportionally
	}

	public FigureEnumeration decompose() {
		return new FigureEnumerator(fFigures);
	}

   /**
	* Gets the handles for the GroupFigure.
	*/
	public Vector<Handle> handles() {
		Vector<Handle> handles = new Vector<Handle>();
		handles.addElement(new GroupHandle(this, RelativeLocator.northWest()));
		handles.addElement(new GroupHandle(this, RelativeLocator.northEast()));
		handles.addElement(new GroupHandle(this, RelativeLocator.southWest()));
		handles.addElement(new GroupHandle(this, RelativeLocator.southEast()));
		return handles;
	}

   /**
	* Sets the attribute of all the contained figures.
	*/
	public void setAttribute(String name, Object value) {
		super.setAttribute(name, value);
		FigureEnumeration k = figures();
		while (k.hasMoreElements())
			k.nextFigure().setAttribute(name, value);
	}
}