/*=========================================================================

  Program:   FusionViewer
  Module:    $RCSfile: PanMouseTool.java,v $
  Language:  Java
  Date:      $Date: 2007/02/02 19:25:27 $
  Version:   $Revision: 1.3 $
  
  Copyright (c) Insightful Corporation.  All rights reserved.
  See Copyright.txt for details.
  
  This software is distributed WITHOUT ANY WARRANTY; without even
  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  PURPOSE.  See the above copyright notice for more information.

=========================================================================*/

package org.fusionviewer.display;

import java.awt.Point;
import java.awt.event.MouseEvent;


/**\class PanMouseTool
 *\brief Pan a zoomed in image in response to the user dragging the mouse.
 */
public class PanMouseTool implements MouseTool {
	private ImageSliceView m_parent;
	private Point m_anchor;

	public PanMouseTool(ImageSliceView parent) {
		m_parent = parent;
	}

	public boolean canHandle(MouseEvent e) {		
		return true;
	}

	public void mousePressed(MouseEvent e) {
		m_anchor = e.getPoint();
	}

	public void mouseReleased(MouseEvent e) {
		m_parent.releaseMouseTool();
	}

	public void mouseDragged(MouseEvent e) {
		int dx = -(e.getX() - m_anchor.x);
		int dy = -(e.getY() - m_anchor.y);

		m_parent.setOrigin(m_parent.getXOrigin() + dx, m_parent.getYOrigin() - dy);
		m_anchor = e.getPoint();
	}

	public void mouseMoved(MouseEvent e) {
	}
}