layeredbarrenderer.java

JFreeChartweb图表

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * -----------------------
 * LayeredBarRenderer.java
 * -----------------------
 * (C) Copyright 2003, by Arnaud Lelievre and Contributors.
 *
 * Original Author:  Arnaud Lelievre (for Garden);
 * Contributor(s):   -;
 *
 *
 * Changes
 * -------
 * 28-Aug-2003 : Version 1 (AL);
 *
 */

package org.jfree.chart.renderer;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.ChartRenderingInfo;
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.CategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.CategoryDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.ObjectList;

/**
 * A {@link CategoryItemRenderer} that represents data using bars which are superimposed.
 *
 * @author Arnaud Lelievre
 */
public class LayeredBarRenderer extends BarRenderer {

    /** A list of the width of each series bar. */
    protected ObjectList seriesBarWidthList;

    /**
     * Default constructor.
     */
    public LayeredBarRenderer() {
        super();
        this.seriesBarWidthList = new ObjectList();

    }


    /**
     * Initialises the renderer.
     * <p>
     * This method gets called once at the start of the process of drawing a chart.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area in which the data is to be plotted.
     * @param plot  the plot.
     * @param index  the secondary index (<code>null</code> for primary renderer).
     * @param info  collects chart rendering information for return to caller.
     *
     */
    public void initialise(Graphics2D g2,
                           Rectangle2D dataArea,
                           CategoryPlot plot,
                           Integer index,
                           ChartRenderingInfo info) {

        super.initialise(g2, dataArea, plot, index, info);

        // calculate the bar width
        CategoryAxis domainAxis = getDomainAxis(plot, index);
        CategoryDataset dataset = getDataset(plot, index);
        if (dataset != null) {
            int columns = dataset.getColumnCount();
            int rows = dataset.getRowCount();
            double space = 0.0;
            PlotOrientation orientation = plot.getOrientation();
            if (orientation == PlotOrientation.HORIZONTAL) {
                space = dataArea.getHeight();
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                space = dataArea.getWidth();
            }
            double categoryMargin = 0.0;
            double currentItemMargin = 0.0;
            if (columns > 1) {
                categoryMargin = domainAxis.getCategoryMargin();
            }
            if (rows > 1) {
                currentItemMargin = getItemMargin();
            }
            double used = space * (1 - domainAxis.getLowerMargin() - domainAxis.getUpperMargin()
                                     - categoryMargin - currentItemMargin);
            if ((rows * columns) > 0) {
                setBarWidth(used / (dataset.getColumnCount()));
            } else {
                setBarWidth(used);
            }
        }

    }

    /**
     * Draws the bar for a single (series, category) data item.
     *
     * @param g2  the graphics device.
     * @param dataArea  the data area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param data  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    protected void drawHorizontalItem(Graphics2D g2,
                                      Rectangle2D dataArea,
                                      CategoryPlot plot,
                                      CategoryAxis domainAxis,
                                      ValueAxis rangeAxis,
                                      CategoryDataset data,
                                      int row,
                                      int column) {

        // nothing is drawn for null values...
        Number dataValue = data.getValue(row, column);
        if (dataValue == null) {
            return;
        }

        // X
        double value = dataValue.doubleValue();
        double base = 0.0;
        double lclip = getLowerClip();
        double uclip = getUpperClip();
        if (uclip <= 0.0) {  // cases 1, 2, 3 and 4
            if (value >= uclip) {
                return; // bar is not visible
            }
            base = uclip;
            if (value <= lclip) {
                value = lclip;
            }
        }
        else if (lclip <= 0.0) { // cases 5, 6, 7 and 8
            if (value >= uclip) {
                value = uclip;
            }
            else {
                if (value <= lclip) {
                    value = lclip;
                }
            }
        }
        else { // cases 9, 10, 11 and 12
            if (value <= lclip) {
                return; // bar is not visible
            }
            base = lclip;
            if (value >= uclip) {
                value = uclip;
            }
        }

        RectangleEdge edge = plot.getRangeAxisEdge();
        double transX1 = rangeAxis.translateValueToJava2D(base, dataArea, edge);
        double transX2 = rangeAxis.translateValueToJava2D(value, dataArea, edge);
        double rectX = Math.min(transX1, transX2);
        double rectWidth = Math.abs(transX2 - transX1);

        // Y
        double rectY = domainAxis.getCategoryStart(column, getColumnCount(), dataArea,
                                                   plot.getDomainAxisEdge());

        int seriesCount = getRowCount();
        int categoryCount = getColumnCount();

        // draw the bar...
        double shift = 0.0;
        double rectHeight = 0.0;
        if (getSeriesBarWidth(row) != getBarWidth()) {
            rectHeight = getSeriesBarWidth(row) * getBarWidth();
            rectY = rectY + (1 - getSeriesBarWidth(row)) * getBarWidth() / 2;
        } else {
            rectHeight = getBarWidth();
            if (seriesCount > 1) {
                shift = rectHeight * 0.20 / (seriesCount - 1);