/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2014, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ---------------
* PanHandler.java
* ---------------
* (C) Copyright 2009-2014, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes:
* --------
* 11-Jun-2009 : Version 1 (DG);
*
*/
package org.jfree.chart.panel;
import java.awt.Cursor;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.geom.Rectangle2D;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.Pannable;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
/**
* Handles panning operations in a {@link ChartPanel} if the plot supports
* them.
*/
public class PanHandler extends AbstractMouseHandler {
/** a generated serial id. */
private static final long serialVersionUID = -2454906267665359292L;
/**
* Temporary storage for the width and height of the chart
* drawing area during panning.
*/
private double panW, panH;
/** The last mouse position during panning. */
private Point panLast;
/**
* Default constructor (creates an instance with no modifier keys).
*/
public PanHandler() {
this(0);
}
/**
* Creates a new instance.
*
* @param modifier the modifier keys that select this handler.
*/
public PanHandler(int modifier) {
super(modifier);
this.panLast = null;
}
@Override
public void mousePressed(MouseEvent e) {
ChartPanel panel = (ChartPanel) e.getSource();
Plot plot = panel.getChart().getPlot();
if (!(plot instanceof Pannable)) {
panel.clearLiveMouseHandler();
return; // there's nothing for us to do (except unregistering)
}
Pannable pannable = (Pannable) plot;
if (pannable.isDomainPannable() || pannable.isRangePannable()) {
Rectangle2D screenDataArea = panel.getScreenDataArea(e.getX(),
e.getY());
if (screenDataArea != null && screenDataArea.contains(
e.getPoint())) {
this.panW = screenDataArea.getWidth();
this.panH = screenDataArea.getHeight();
this.panLast = e.getPoint();
panel.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
}
}
// the actual panning occurs later in the mouseDragged() method
}
@Override
public void mouseDragged(MouseEvent e) {
ChartPanel panel = (ChartPanel) e.getSource();
if (this.panLast == null) {
//handle panning if we have a start point else unregister
panel.clearLiveMouseHandler();
return;
}
JFreeChart chart = panel.getChart();
double dx = e.getX() - this.panLast.getX();
double dy = e.getY() - this.panLast.getY();
if (dx == 0.0 && dy == 0.0) {
return;
}
double wPercent = -dx / this.panW;
double hPercent = dy / this.panH;
boolean old = chart.getPlot().isNotify();
chart.getPlot().setNotify(false);
Pannable p = (Pannable) chart.getPlot();
PlotRenderingInfo info = panel.getChartRenderingInfo().getPlotInfo();
if (p.getOrientation() == PlotOrientation.VERTICAL) {
p.panDomainAxes(wPercent, info, this.panLast);
p.panRangeAxes(hPercent, info, this.panLast);
}
else {
p.panDomainAxes(hPercent, info, this.panLast);
p.panRangeAxes(wPercent, info, this.panLast);
}
this.panLast = e.getPoint();
chart.getPlot().setNotify(old);
}
@Override
public void mouseReleased(MouseEvent e) {
ChartPanel panel = (ChartPanel) e.getSource();
//if we have been panning reset the cursor
//unregister in any case
if (this.panLast != null) {
panel.setCursor(Cursor.getDefaultCursor());
}
this.panLast = null;
panel.clearLiveMouseHandler();
}
/**
* @see AbstractMouseHandler#isLiveHandler()
*/
public boolean isLiveHandler() {
return true;
}
}