/* ===========================================================
* 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.]
*
* -----------------------------
* FreePathSelectionHandler.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);
*
*/
package org.jfree.chart.panel.selectionhandler;
import java.awt.Color;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Stroke;
import java.awt.event.MouseEvent;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.List;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.util.ShapeUtils;
/**
* A mouse handler that allows data items to be selected. The selection path
* can be freely manipulated by dragging the mouse away from the starting
* point. This selection handler is intended for intersection based selection.
*
* Will only work together with a ChartPanel as event source
*/
public class FreePathSelectionHandler extends RegionSelectionHandler {
/** a generated serial id. */
private static final long serialVersionUID = 8051992918085934799L;
/**
* temporary storage for points
*/
private List<Point> points;
/**
* The selection path (in Java2D space).
*/
private GeneralPath selectionPath;
/**
* The start mouse point.
*/
private Point2D lastPoint;
/**
* Creates a new default instance.
*/
public FreePathSelectionHandler() {
this.selectionPath = new GeneralPath();
this.lastPoint = null;
this.points = new ArrayList<Point>();
setFillPaint(Color.GRAY);
setOutlinePaint(new Color(0,160,230));
}
/**
* Creates a new instance with a modifier restriction
* @param modifier e.g. shift has to be pressed InputEvents.SHIFT_MASK
*/
public FreePathSelectionHandler(int modifier) {
super(modifier);
this.selectionPath = new GeneralPath();
this.lastPoint = null;
this.points = new ArrayList<Point>();
setFillPaint(Color.GRAY);
setOutlinePaint(new Color(0,160,230));
}
/**
* 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 FreePathSelectionHandler(Stroke outlineStroke, Paint outlinePaint,
Paint fillPaint) {
super(outlineStroke, outlinePaint, fillPaint);
this.selectionPath = new GeneralPath();
this.lastPoint = null;
this.points = new ArrayList<Point>();
}
/**
* starts the selection by fixing the start point of the selection path
*
* @param e the event.
*/
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.lastPoint = new Point(pt);
this.points.add(pt);
}
}
}
/**
* adjusts the selection by adding a new line segment from the last to the
* actual position
*
* @param e the event.
*/
public void mouseDragged(MouseEvent e) {
ChartPanel panel = (ChartPanel) e.getSource();
if (this.lastPoint == null) {
panel.clearLiveMouseHandler();
return; // we never started a selection
}
Point pt = e.getPoint();
Point2D pt2 = ShapeUtils.getPointInRectangle(pt.x, pt.y,
panel.getScreenDataArea());
if (pt2.distance(this.lastPoint) > 5) {
this.points.add(new Point((int)pt2.getX(), (int)pt2.getY()));
this.lastPoint = pt2;
}
selectionPath = createPathFromPoints(this.points);
panel.setSelectionShape(selectionPath);
panel.setSelectionFillPaint(this.fillPaint);
panel.setSelectionOutlinePaint(this.outlinePaint);
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.
*/
public void mouseReleased(MouseEvent e) {
ChartPanel panel = (ChartPanel) e.getSource();
if (this.lastPoint == null) {
panel.clearLiveMouseHandler();
return; // we never started a selection
}
this.selectionPath = createPathFromPoints(this.points);
this.selectionPath.closePath();
SelectionManager selectionManager = panel.getSelectionManager();
// do something with the selection shape
if (selectionManager != null) {
selectionManager.select(this.selectionPath);
}
panel.setSelectionShape(null);
this.selectionPath.reset();
this.points.clear();
this.lastPoint = null;
panel.repaint();
panel.clearLiveMouseHandler();
}
/**
* creates a line shape from a series of points
*
* @param points
* @return the line shape
*/
private GeneralPath createPathFromPoints(List<Point> points) {
GeneralPath path = new GeneralPath();
if (points.size() > 0) {
Point p = points.get(0);
path.moveTo(p.getX(), p.getY());
}
for (int i = 1; i < points.size(); i++) {
Point p = points.get(i);
path.lineTo((p.getX() - 1), (p.getY() + 1));
path.lineTo((p.getX() + 1), (p.getY() + 1));
}
for (int i = (points.size() -1); i >= 0; i--) {
Point p = points.get(i);
path.lineTo((p.getX() + 1), (p.getY() - 1));
path.lineTo((p.getX() - 1), (p.getY() - 1));
}
return path;
}
}