/* ===========================================================
* 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.]
*
* -----------------------------------
* CircularRegionSelectionHandler.java
* -----------------------------------
* (C) Copyright 2013, 2014, by Michael Zinsmaier and Contributors.
*
* Original Author: Michael Zinsmaier;
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* Changes:
* --------
* 17-Sep-2013 : Version 1 from MZ (DG);
* 18-Sep-2013 : Allow circle to grow beyound plot bounds, but crop the
* selection region (DG);
*
*/
package org.jfree.chart.panel.selectionhandler;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Stroke;
import java.awt.event.MouseEvent;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import org.jfree.chart.ChartPanel;
/**
* A mouse handler that allows data items to be selected. The selection shape
* is a circle that can be expanded by dragging the mouse away from the starting
* point. Will only work together with a <code>ChartPanel</code> as the event
* source.
*/
public class CircularRegionSelectionHandler extends RegionSelectionHandler {
/** A generated serial id. */
private static final long serialVersionUID = 5627320657050195767L;
/**
* The selection path (in Java2D space).
*/
private Ellipse2D selectionCircle;
/**
* The start mouse point.
*/
private Point2D startPoint;
/**
* Creates a new default instance.
*/
public CircularRegionSelectionHandler() {
super();
this.selectionCircle = null;
this.startPoint = null;
}
/**
* Creates a new instance with a modifier restriction.
*
* @param modifier the modifier (for example, shift has to be pressed
* InputEvents.SHIFT_MASK).
*/
public CircularRegionSelectionHandler(int modifier) {
super(modifier);
this.selectionCircle = null;
this.startPoint = null;
}
/**
* Creates a new selection handler with the specified attributes.
*
* @param outlineStroke the outline stroke.
* @param outlinePaint the outline paint.
* @param fillPaint the fill paint.
*/
public CircularRegionSelectionHandler(Stroke outlineStroke,
Paint outlinePaint, Paint fillPaint) {
super(outlineStroke, outlinePaint, fillPaint);
this.selectionCircle = null;
this.startPoint = null;
}
/**
* Starts the circle selection by fixing the center of the circle.
*
* @param e the event.
*/
@Override
public void mousePressed(MouseEvent e) {
if (!(e.getSource() instanceof ChartPanel)) {
return;
}
ChartPanel panel = (ChartPanel) e.getSource();
Rectangle2D dataArea = panel.getScreenDataArea();
if (dataArea.contains(e.getPoint())) {
SelectionManager selectionManager = panel.getSelectionManager();
if (selectionManager != null) {
if (!e.isShiftDown()) {
selectionManager.clearSelection();
}
Point pt = e.getPoint();
this.startPoint = new Point(pt);
this.selectionCircle = new Ellipse2D.Double(pt.x, pt.y, 1, 1);
}
}
}
/**
* Adjusts the radius of the circle according to the actual mouse position.
*
* @param e the event.
*/
@Override
public void mouseDragged(MouseEvent e) {
ChartPanel panel = (ChartPanel) e.getSource();
if (this.startPoint == null) {
panel.clearLiveMouseHandler();
return; // we never started a selection
}
Point pt2 = e.getPoint();
double r = this.startPoint.distance(pt2);
if (r <= 0) {
r = 1.0;
}
this.selectionCircle = new Ellipse2D.Double(this.startPoint.getX() - r,
this.startPoint.getY() - r, 2.0 * r, 2.0 * r);
Area selectionArea = new Area(this.selectionCircle);
selectionArea.intersect(new Area(panel.getScreenDataArea()));
panel.setSelectionShape(selectionArea);
panel.setSelectionFillPaint(this.fillPaint);
panel.setSelectionOutlinePaint(this.outlinePaint);
panel.setSelectionOutlineStroke(this.outlineStroke);
panel.repaint();
}
/**
* Finishes the selection and calls the {@link SelectionManager} of
* the event source. The SelectionManager is then responsible for the
* processing of the geometric selection.
*
* @param e the event.
*/
@Override
public void mouseReleased(MouseEvent e) {
ChartPanel panel = (ChartPanel) e.getSource();
if (this.startPoint == null) {
panel.clearLiveMouseHandler();
return; // we never started a selection
}
SelectionManager selectionManager = panel.getSelectionManager();
// do something with the selection shape
if (selectionManager != null) {
selectionManager.select(new GeneralPath(this.selectionCircle));
}
panel.setSelectionShape(null);
this.selectionCircle = null;
this.startPoint = null;
panel.repaint();
panel.clearLiveMouseHandler();
}
}