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

  Program:   FusionViewer
  Module:    $RCSfile: ZoomMouseTool.java,v $
  Language:  Java
  Date:      $Date: 2007/01/03 07:03:22 $
  Version:   $Revision: 1.2 $
  
  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 ZoomMouseTool
 *\brief Zoom an image in response to a user dragging the mouse vertically.
 */
public class ZoomMouseTool implements MouseTool {
	private ImageSliceView m_parent;
	private Point m_anchor;
	private float m_baseSpacing0, m_baseSpacing1;
	
	public ZoomMouseTool(ImageSliceView parent) {
		m_parent = parent;
	}

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

	public void mousePressed(MouseEvent e) {
		
		m_baseSpacing0 = m_parent.getPixelSpacing(0);
		m_baseSpacing1 = m_parent.getPixelSpacing(1);

		m_anchor = e.getPoint();
	}

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

	public void mouseDragged(MouseEvent e) {
		float delta = e.getY() - m_anchor.y;

		final float SCALING = 0.01f;

		float x = m_baseSpacing0 + delta * m_baseSpacing0 * SCALING;
		float y = m_baseSpacing1 + delta * m_baseSpacing1 * SCALING;

		if ((x > 0) && (y > 0))
			m_parent.setSpacing(x, y,true);
	}

	public void mouseMoved(MouseEvent e) {
	}
}