TopAnchor.java

//------------------------------------------------------------------------------
// Copyright (c) 2005, 2006 IBM Corporation and others.
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// which accompanies this distribution, and is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// Contributors:
// IBM Corporation - initial implementation
//------------------------------------------------------------------------------
package org.eclipse.epf.authoring.gef.edit;

import org.eclipse.draw2d.AbstractConnectionAnchor;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;

/**
 * Connection anchor for top of the figure. 
 * 
 * @author Phong Nguyen Le
 * @since 1.0
 */
class TopAnchor extends AbstractConnectionAnchor {

	private int offset;

	TopAnchor(IFigure source, int offset) {
		super(source);
		this.offset = offset;
	}

	public Point getLocation(Point reference) {
		Rectangle r = getOwner().getBounds().getCopy();
		getOwner().translateToAbsolute(r);
		int off = offset;
		if (off == -1)
			off = r.width / 2;
		if (r.contains(reference) || r.y < reference.y)
			return r.getBottomLeft().translate(off, -1);
		else
			return r.getTopLeft().translate(off, 0);
	}

}