/* ================================================ * JFreeChart-FX : JavaFX extensions for JFreeChart * ================================================ * * (C) Copyright 2017, by Object Refinery Limited and Contributors. * * Project Info: https://github.com/jfree/jfreechart-fx * * 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.] * * -------------------- * AnchorHandlerFX.java * -------------------- * (C) Copyright 2014-2016, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * */ package org.jfree.chart.fx.interaction; import java.awt.geom.Point2D; import javafx.scene.input.MouseEvent; import org.jfree.chart.fx.ChartCanvas; /** * Handles mouse clicks on the {@link ChartCanvas} by updating the anchor and * redrawing the chart. */ public class AnchorHandlerFX extends AbstractMouseHandlerFX { /** Records the mouse down location. */ private Point2D mousePressedPoint; /** * Creates a new instance. * * @param id the id ({@code null} not permitted). */ public AnchorHandlerFX(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()); } /** * 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 ({@code null} not permitted). * @param e the mouse event ({@code 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.setAnchor(currPt); } this.mousePressedPoint = null; } }