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.] * * ------------------ * ZoomHandlerFX.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 de.hs.mannheim.modUro.controller.diagram.fx.ChartViewer; import javafx.scene.input.MouseEvent; import org.jfree.chart.plot.Plot; import org.jfree.chart.plot.PlotRenderingInfo; import org.jfree.chart.plot.Zoomable; import org.jfree.util.ShapeUtilities; /** * Handles drag zooming 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). This handler only works for * a <b>ChartCanvas</b> that is embedded in a {@link ChartViewer}, since it * relies on the <b>ChartViewer</b> for drawing the zoom rectangle. * * <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 ZoomHandlerFX extends AbstractMouseHandlerFX { /** The viewer is used to overlay the zoom rectangle. */ private ChartViewer viewer; /** The starting point for the zoom. */ private Point2D startPoint; /** * Creates a new instance with no modifier keys required. * * @param id the handler ID (<code>null</code> not permitted). * @param parent the chart viewer. */ public ZoomHandlerFX(String id, ChartViewer parent) { this(id, parent, false, false, false, false); } /** * Creates a new instance that will be activated using the specified * combination of modifier keys. * * @param id the handler ID (<code>null</code> not permitted). * @param parent the chart viewer. * @param altKey require ALT key? * @param ctrlKey require CTRL key? * @param metaKey require META key? * @param shiftKey require SHIFT key? */ public ZoomHandlerFX(String id, ChartViewer parent, boolean altKey, boolean ctrlKey, boolean metaKey, boolean shiftKey) { super(id, altKey, ctrlKey, metaKey, shiftKey); this.viewer = parent; } /** * 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) { Point2D pt = new Point2D.Double(e.getX(), e.getY()); Rectangle2D dataArea = canvas.findDataArea(pt); if (dataArea != null) { this.startPoint = ShapeUtilities.getPointInRectangle(e.getX(), e.getY(), dataArea); } else { this.startPoint = null; canvas.clearLiveHandler(); } } /** * Handles a mouse dragged event by updating the zoom rectangle displayed * in the ChartViewer. * * @param canvas the JavaFX canvas (<code>null</code> not permitted). * @param e the mouse event (<code>null</code> not permitted). */ @Override public void handleMouseDragged(ChartCanvas canvas, MouseEvent e) { if (this.startPoint == null) { //no initial zoom rectangle exists but the handler is set //as life handler unregister canvas.clearLiveHandler(); return; } boolean hZoom, vZoom; Plot p = canvas.getChart().getPlot(); if (!(p instanceof Zoomable)) { return; } Zoomable z = (Zoomable) p; if (z.getOrientation().isHorizontal()) { hZoom = z.isRangeZoomable(); vZoom = z.isDomainZoomable(); } else { hZoom = z.isDomainZoomable(); vZoom = z.isRangeZoomable(); } Rectangle2D dataArea = canvas.findDataArea(this.startPoint); double x = this.startPoint.getX(); double y = this.startPoint.getY(); double w = 0; double h = 0; if (hZoom && vZoom) { // selected rectangle shouldn't extend outside the data area... double xmax = Math.min(e.getX(), dataArea.getMaxX()); double ymax = Math.min(e.getY(), dataArea.getMaxY()); w = xmax - this.startPoint.getX(); h = ymax - this.startPoint.getY(); } else if (hZoom) { double xmax = Math.min(e.getX(), dataArea.getMaxX()); y = dataArea.getMinY(); w = xmax - this.startPoint.getX(); h = dataArea.getHeight(); } else if (vZoom) { double ymax = Math.min(e.getY(), dataArea.getMaxY()); x = dataArea.getMinX(); w = dataArea.getWidth(); h = ymax - this.startPoint.getY(); } viewer.showZoomRectangle(x, y, w, h); } @Override public void handleMouseReleased(ChartCanvas canvas, MouseEvent e) { Plot p = canvas.getChart().getPlot(); if (!(p instanceof Zoomable)) { return; } boolean hZoom, vZoom; Zoomable z = (Zoomable) p; if (z.getOrientation().isHorizontal()) { hZoom = z.isRangeZoomable(); vZoom = z.isDomainZoomable(); } else { hZoom = z.isDomainZoomable(); vZoom = z.isRangeZoomable(); } boolean zoomTrigger1 = hZoom && Math.abs(e.getX() - this.startPoint.getX()) >= 10; boolean zoomTrigger2 = vZoom && Math.abs(e.getY() - this.startPoint.getY()) >= 10; if (zoomTrigger1 || zoomTrigger2) { Point2D endPoint = new Point2D.Double(e.getX(), e.getY()); PlotRenderingInfo pri = canvas.getRenderingInfo().getPlotInfo(); if ((hZoom && (e.getX() < this.startPoint.getX())) || (vZoom && (e.getY() < this.startPoint.getY()))) { boolean saved = p.isNotify(); p.setNotify(false); z.zoomDomainAxes(0, pri, endPoint); z.zoomRangeAxes(0, pri, endPoint); p.setNotify(saved); } else { double x = this.startPoint.getX(); double y = this.startPoint.getY(); double w = e.getX() - x; double h = e.getY() - y; Rectangle2D dataArea = canvas.findDataArea(this.startPoint); double maxX = dataArea.getMaxX(); double maxY = dataArea.getMaxY(); // for mouseReleased event, (horizontalZoom || verticalZoom) // will be true, so we can just test for either being false; // otherwise both are true if (!vZoom) { y = dataArea.getMinY(); w = Math.min(w, maxX - this.startPoint.getX()); h = dataArea.getHeight(); } else if (!hZoom) { x = dataArea.getMinX(); w = dataArea.getWidth(); h = Math.min(h, maxY - this.startPoint.getY()); } else { w = Math.min(w, maxX - this.startPoint.getX()); h = Math.min(h, maxY - this.startPoint.getY()); } Rectangle2D zoomArea = new Rectangle2D.Double(x, y, w, h); boolean saved = p.isNotify(); p.setNotify(false); double pw0 = percentW(x, dataArea); double pw1 = percentW(x + w, dataArea); double ph0 = percentH(y, dataArea); double ph1 = percentH(y + h, dataArea); PlotRenderingInfo info = this.viewer.getRenderingInfo().getPlotInfo(); if (z.getOrientation().isVertical()) { z.zoomDomainAxes(pw0, pw1, info, endPoint); z.zoomRangeAxes(1 - ph1, 1 - ph0, info, endPoint); } else { z.zoomRangeAxes(pw0, pw1, info, endPoint); z.zoomDomainAxes(1 - ph1, 1 - ph0, info, endPoint); } p.setNotify(saved); } } viewer.hideZoomRectangle(); this.startPoint = null; canvas.clearLiveHandler(); } private double percentW(double x, Rectangle2D r) { return (x - r.getMinX()) / r.getWidth(); } private double percentH(double y, Rectangle2D r) { return (y - r.getMinY()) / r.getHeight(); } }