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.] * ------------------------ * IntervalBarRenderer.java * ------------------------ * (C) Copyright 2002-2004, by Jeremy Bowman. * Original Author: Jeremy Bowman; * Contributor(s): David Gilbert (for Object Refinery Limited); * Christian W. Zuckschwerdt; * $Id: IntervalBarRenderer.java,v 1.1 2011-01-31 09:02:48 klukas Exp $ * Changes * ------- * 29-Apr-2002 : Version 1, contributed by Jeremy Bowman (DG); * 11-May-2002 : Use CategoryPlot.getLabelsVisible() (JB); * 29-May-2002 : Added constructors (DG); * 26-Jun-2002 : Added axis to initialise method (DG); * 20-Sep-2002 : Added basic support for chart entities (DG); * 24-Oct-2002 : Amendments for changes in CategoryDataset interface and CategoryToolTipGenerator * interface (DG); * 05-Nov-2002 : Base dataset is now TableDataset not CategoryDataset (DG); * 25-Mar-2003 : Implemented Serializable (DG); * 30-Jul-2003 : Modified entity constructor (CZ); * 19-Aug-2003 : Implemented Cloneable and PublicCloneable (DG); * 08-Sep-2003 : Added checks for null values (DG); * 07-Oct-2003 : Added renderer state (DG); * 21-Oct-2003 : Bar width moved into renderer state (DG); * 23-Dec-2003 : Removed the deprecated MultiIntervalCategoryDataset interface (DG); */ package org.jfree.chart.renderer; import java.awt.Graphics2D; import java.awt.Paint; import java.awt.Stroke; import java.awt.geom.Rectangle2D; import java.io.Serializable; import org.jfree.chart.axis.CategoryAxis; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.entity.CategoryItemEntity; import org.jfree.chart.entity.EntityCollection; import org.jfree.chart.labels.CategoryLabelGenerator; import org.jfree.chart.labels.CategoryToolTipGenerator; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.CategoryDataset; import org.jfree.data.IntervalCategoryDataset; import org.jfree.ui.RectangleEdge; import org.jfree.util.PublicCloneable; /** * A renderer that handles the drawing of bars for a bar plot where * each bar has a high and low value. * <p> * For use with the {@link CategoryPlot} class. * * @author Jeremy Bowman */ public class IntervalBarRenderer extends BarRenderer implements CategoryItemRenderer, Cloneable, PublicCloneable, Serializable { /** * Constructs a new renderer. */ public IntervalBarRenderer() { super(); } /** * Draws the bar for a single (series, category) data item. * * @param g2 * the graphics device. * @param state * the renderer state. * @param dataArea * the data area. * @param plot * the plot. * @param domainAxis * the domain axis. * @param rangeAxis * the range axis. * @param dataset * the dataset. * @param row * the row index (zero-based). * @param column * the column index (zero-based). */ public void drawItem(Graphics2D g2, CategoryItemRendererState state, Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis, ValueAxis rangeAxis, CategoryDataset dataset, int row, int column) { if (dataset instanceof IntervalCategoryDataset) { IntervalCategoryDataset d = (IntervalCategoryDataset) dataset; drawInterval(g2, state, dataArea, plot, domainAxis, rangeAxis, d, row, column); } else { super.drawItem(g2, state, dataArea, plot, domainAxis, rangeAxis, dataset, row, column); } } /** * Draws a single interval. * * @param g2 * the graphics device. * @param state * the renderer state. * @param dataArea * the data plot area. * @param plot * the plot. * @param domainAxis * the domain axis. * @param rangeAxis * the range axis. * @param dataset * the data. * @param row * the row index (zero-based). * @param column * the column index (zero-based). */ protected void drawInterval(Graphics2D g2, CategoryItemRendererState state, Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis, ValueAxis rangeAxis, IntervalCategoryDataset dataset, int row, int column) { int seriesCount = getRowCount(); int categoryCount = getColumnCount(); PlotOrientation orientation = plot.getOrientation(); double rectX = 0.0; double rectY = 0.0; RectangleEdge domainAxisLocation = plot.getDomainAxisEdge(); RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge(); // Y0 Number value0 = dataset.getEndValue(row, column); if (value0 == null) { return; } double java2dValue0 = rangeAxis.valueToJava2D(value0.doubleValue(), dataArea, rangeAxisLocation); // Y1 Number value1 = dataset.getStartValue(row, column); if (value1 == null) { return; } double java2dValue1 = rangeAxis.valueToJava2D(value1.doubleValue(), dataArea, rangeAxisLocation); if (java2dValue1 < java2dValue0) { double temp = java2dValue1; java2dValue1 = java2dValue0; java2dValue0 = temp; Number tempNum = value1; value1 = value0; value0 = tempNum; } // BAR WIDTH double rectWidth = state.getBarWidth(); // BAR HEIGHT double rectHeight = Math.abs(java2dValue1 - java2dValue0); if (orientation == PlotOrientation.HORIZONTAL) { // BAR Y rectY = domainAxis.getCategoryStart(column, getColumnCount(), dataArea, domainAxisLocation); if (seriesCount > 1) { double seriesGap = dataArea.getHeight() * getItemMargin() / (categoryCount * (seriesCount - 1)); rectY = rectY + row * (state.getBarWidth() + seriesGap); } else { rectY = rectY + row * state.getBarWidth(); } rectX = java2dValue0; rectHeight = state.getBarWidth(); rectWidth = Math.abs(java2dValue1 - java2dValue0); } else if (orientation == PlotOrientation.VERTICAL) { // BAR X rectX = domainAxis.getCategoryStart(column, getColumnCount(), dataArea, domainAxisLocation); if (seriesCount > 1) { double seriesGap = dataArea.getWidth() * getItemMargin() / (categoryCount * (seriesCount - 1)); rectX = rectX + row * (state.getBarWidth() + seriesGap); } else { rectX = rectX + row * state.getBarWidth(); } rectY = java2dValue0; } Rectangle2D bar = new Rectangle2D.Double(rectX, rectY, rectWidth, rectHeight); Paint seriesPaint = getItemPaint(row, column); g2.setPaint(seriesPaint); g2.fill(bar); // draw the outline... if (state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) { Stroke stroke = getItemOutlineStroke(row, column); Paint paint = getItemOutlinePaint(row, column); if (stroke != null && paint != null) { g2.setStroke(stroke); g2.setPaint(paint); g2.draw(bar); } } CategoryLabelGenerator generator = getLabelGenerator(row, column); if (generator != null && isItemLabelVisible(row, column)) { drawItemLabel(g2, dataset, row, column, plot, generator, bar, false); } // collect entity and tool tip information... if (state.getInfo() != null) { EntityCollection entities = state.getInfo().getOwner().getEntityCollection(); if (entities != null) { String tip = null; CategoryToolTipGenerator tipster = getToolTipGenerator(row, column); if (tipster != null) { tip = tipster.generateToolTip(dataset, row, column); } String url = null; if (getItemURLGenerator(row, column) != null) { url = getItemURLGenerator(row, column).generateURL(dataset, row, column); } CategoryItemEntity entity = new CategoryItemEntity(bar, tip, url, dataset, row, dataset.getColumnKey(column), column); entities.addEntity(entity); } } } }