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JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D APIs, it currently supports bar charts, pie charts,
line charts, XY-plots and time series plots.
/* ===========================================================
* 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.]
*
* ----------------------
* DispatchHandlerFX.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 javafx.scene.input.MouseEvent;
import org.jfree.chart.fx.ChartCanvas;
import org.jfree.chart.fx.ChartViewer;
/**
* Handles mouse move and click events on the {@link ChartCanvas} by
* dispatching {@link ChartMouseEventFX} events to listeners that are
* registered with the {@code ChartCanvas} (listeners can also be registered
* with a {@link ChartViewer} control).
*
* 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.
*
* @since 1.0.18
*/
public class DispatchHandlerFX extends AbstractMouseHandlerFX {
/** Records the mouse down location. */
private Point2D mousePressedPoint;
/**
* Creates a new instance.
*
* @param id the id (null not permitted).
*/
public DispatchHandlerFX(String id) {
super(id, false, false, false, false);
}
/**
* Handles a mouse pressed event by recording the location of the mouse
* pointer (so that later we can check that the click isn't part of a
* drag).
*
* @param canvas the chart canvas.
* @param e the mouse event.
*/
@Override
public void handleMousePressed(ChartCanvas canvas, MouseEvent e) {
this.mousePressedPoint = new Point2D.Double(e.getX(), e.getY());
}
@Override
public void handleMouseMoved(ChartCanvas canvas, MouseEvent e) {
Point2D currPt = new Point2D.Double(e.getX(), e.getY());
canvas.dispatchMouseMovedEvent(currPt, e);
}
/**
* Handles a mouse clicked event by setting the anchor point for the
* canvas and redrawing the chart (the anchor point is a reference point
* used by the chart to determine crosshair lines).
*
* @param canvas the chart canvas (null not permitted).
* @param e the mouse event (null not permitted).
*/
@Override
public void handleMouseClicked(ChartCanvas canvas, MouseEvent e) {
if (this.mousePressedPoint == null) {
return;
}
Point2D currPt = new Point2D.Double(e.getX(), e.getY());
if (this.mousePressedPoint.distance(currPt) < 2) {
canvas.dispatchMouseClickedEvent(currPt, e);
}
this.mousePressedPoint = null;
}
}