/* ===========================================================
* 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -----------------
* PanHandlerFX.java
* -----------------
* (C) Copyright 2014, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes:
* --------
* 25-Jun-2014 : Version 1 (DG);
*
*/
package org.jfree.chart.fx.interaction;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import javafx.scene.input.MouseEvent;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.fx.ChartCanvas;
import org.jfree.chart.plot.Pannable;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotRenderingInfo;
/**
* Handles panning of charts on a {@link ChartCanvas}. This handler
* should be configured with the required modifier keys and installed as a
* live handler (not an auxiliary handler).
*
* <p>THE API FOR THIS CLASS IS SUBJECT TO CHANGE IN FUTURE RELEASES. This is
* so that we can incorporate feedback on the (new) JavaFX support in
* JFreeChart.</p>
*
* @since 1.0.18
*/
public class PanHandlerFX extends AbstractMouseHandlerFX {
/** The last mouse location seen during panning. */
private Point2D panLast;
private double panW;
private double panH;
/**
* Creates a new instance that requires no modifier keys.
*
* @param id the id (<code>null</code> not permitted).
*/
public PanHandlerFX(String id) {
this(id, false, false, false, false);
}
/**
* Creates a new instance that will be activated using the specified
* combination of modifier keys.
*
* @param id the id (<code>null</code> not permitted).
* @param altKey require ALT key?
* @param ctrlKey require CTRL key?
* @param metaKey require META key?
* @param shiftKey require SHIFT key?
*/
public PanHandlerFX(String id, boolean altKey, boolean ctrlKey,
boolean metaKey, boolean shiftKey) {
super(id, altKey, ctrlKey, metaKey, shiftKey);
}
/**
* Handles a mouse pressed event by recording the initial mouse pointer
* location.
*
* @param canvas the JavaFX canvas (<code>null</code> not permitted).
* @param e the mouse event (<code>null</code> not permitted).
*/
@Override
public void handleMousePressed(ChartCanvas canvas, MouseEvent e) {
Plot plot = canvas.getChart().getPlot();
if (!(plot instanceof Pannable)) {
canvas.clearLiveHandler();
return;
}
Pannable pannable = (Pannable) plot;
if (pannable.isDomainPannable() || pannable.isRangePannable()) {
Point2D point = new Point2D.Double(e.getX(), e.getY());
Rectangle2D dataArea = canvas.findDataArea(point);
if (dataArea != null && dataArea.contains(point)) {
this.panW = dataArea.getWidth();
this.panH = dataArea.getHeight();
this.panLast = point;
canvas.setCursor(javafx.scene.Cursor.MOVE);
}
}
// the actual panning occurs later in the mouseDragged() method
}
/**
* Handles a mouse dragged event by calculating the distance panned and
* updating the axes accordingly.
*
* @param canvas the JavaFX canvas (<code>null</code> not permitted).
* @param e the mouse event (<code>null</code> not permitted).
*/
public void handleMouseDragged(ChartCanvas canvas, MouseEvent e) {
if (this.panLast == null) {
//handle panning if we have a start point else unregister
canvas.clearLiveHandler();
return;
}
JFreeChart chart = canvas.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 = canvas.getRenderingInfo().getPlotInfo();
if (p.getOrientation().isVertical()) {
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 = new Point2D.Double(e.getX(), e.getY());
chart.getPlot().setNotify(old);
}
public void handleMouseReleased(ChartCanvas canvas, MouseEvent e) {
//if we have been panning reset the cursor
//unregister in any case
if (this.panLast != null) {
canvas.setCursor(javafx.scene.Cursor.DEFAULT);
}
this.panLast = null;
canvas.clearLiveHandler();
}
}