Java tutorial
/* * =========================================================== * JFreeChart : a free chart library for the Java(tm) platform * =========================================================== * (C) Copyright 2000-2004, 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., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * [Java is a trademark or registered trademark of Sun Microsystems, Inc. * in the United States and other countries.] * ------------------ * XYDotRenderer.java * ------------------ * (C) Copyright 2002-2004, by Object Refinery Limited. * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): Christian W. Zuckschwerdt; * ; * $Id: XYDotRenderer.java,v 1.1 2011-01-31 09:02:48 klukas Exp $ * Changes (from 29-Oct-2002) * -------------------------- * 29-Oct-2002 : Added standard header (DG); * 25-Mar-2003 : Implemented Serializable (DG); * 01-May-2003 : Modified drawItem(...) method signature (DG); * 30-Jul-2003 : Modified entity constructor (CZ); * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG); * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG); * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG); */ package org.jfree.chart.renderer; import java.awt.Graphics2D; import java.awt.geom.Rectangle2D; import java.io.Serializable; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.CrosshairState; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.PlotRenderingInfo; import org.jfree.chart.plot.XYPlot; import org.jfree.data.XYDataset; import org.jfree.ui.RectangleEdge; import org.jfree.util.PublicCloneable; /** * A renderer that draws a small dot at each data point for an {@link XYPlot}. */ public class XYDotRenderer extends AbstractXYItemRenderer implements XYItemRenderer, Cloneable, PublicCloneable, Serializable { /** * Constructs a new renderer. */ public XYDotRenderer() { super(); } /** * Draws the visual representation of a single data item. * * @param g2 * the graphics device. * @param state * the renderer state. * @param dataArea * the area within which the data is being drawn. * @param info * collects information about the drawing. * @param plot * the plot (can be used to obtain standard color information etc). * @param domainAxis * the domain (horizontal) axis. * @param rangeAxis * the range (vertical) axis. * @param dataset * the dataset. * @param series * the series index (zero-based). * @param item * the item index (zero-based). * @param crosshairState * crosshair information for the plot (<code>null</code> permitted). * @param pass * the pass index. */ public void drawItem(Graphics2D g2, XYItemRendererState state, Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot, ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset, int series, int item, CrosshairState crosshairState, int pass) { // get the data point... Number xn = dataset.getXValue(series, item); Number yn = dataset.getYValue(series, item); if (yn != null) { double x = xn.doubleValue(); double y = yn.doubleValue(); RectangleEdge xAxisLocation = plot.getDomainAxisEdge(); RectangleEdge yAxisLocation = plot.getRangeAxisEdge(); double transX = domainAxis.valueToJava2D(x, dataArea, xAxisLocation); double transY = rangeAxis.valueToJava2D(y, dataArea, yAxisLocation); g2.setPaint(this.getItemPaint(series, item)); PlotOrientation orientation = plot.getOrientation(); if (orientation == PlotOrientation.HORIZONTAL) { g2.drawRect((int) transY, (int) transX, 1, 1); } else if (orientation == PlotOrientation.VERTICAL) { g2.drawRect((int) transX, (int) transY, 1, 1); } updateCrosshairValues(crosshairState, x, y, transX, transY, orientation); } } /** * Returns a clone of the renderer. * * @return A clone. * @throws CloneNotSupportedException * if the renderer cannot be cloned. */ public Object clone() throws CloneNotSupportedException { return super.clone(); } }