Java tutorial
/* =========================================================== * 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 de.hs.mannheim.modUro.controller.diagram.fx.interaction; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; import de.hs.mannheim.modUro.controller.diagram.fx.ChartCanvas; import javafx.scene.input.MouseEvent; import org.jfree.chart.JFreeChart; 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(); } }