stackedxybarrenderer.java

这是一个segy数据显示程序

/* ===========================================================
 * 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.]
 *
 * ------------------
 * StackedXYBarRenderer.java
 * ------------------
 * (C) Copyright 2001-2004, by Object Refinery Limited.
 *
 * Original Author:  Andreas Schroeder;
 * Contributor(s):   -;
 *                   
 *
 * $Id: StackedXYBarRenderer.java,v 1.6 2004/05/06 08:37:22 mungady Exp $
 *
 * Changes
 * -------
 * 01-Apr-2004 : Version 1 (AS);
 */

package org.jfree.chart.renderer;

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

import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.labels.XYToolTipGenerator;
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.DatasetUtilities;
import org.jfree.data.IntervalXYDataset;
import org.jfree.data.Range;
import org.jfree.data.TableXYDataset;
import org.jfree.data.XYDataset;
import org.jfree.ui.RectangleEdge;

/**
 * A bar renderer that displays the series items stacked.
 * The dataset used together with this renderer must be a
 * {@link org.jfree.data.IntervalXYDataset} and a
 * {@link org.jfree.data.TableXYDataset}. For example, the
 * dataset class {@link org.jfree.data.CategoryTableXYDataset}
 * implements both interfaces.
 * 
 * @author andreas.schroeder
 */
public class StackedXYBarRenderer extends XYBarRenderer {
    /**
     * creates a new renderer.
     */
    public StackedXYBarRenderer() {
        super();
    }

    /**
     * creates a new renderer.
     * 
     * @param margin the percentual amount of the bars tha are cut away.
     */ 
    public StackedXYBarRenderer(double margin) {
        super(margin);
    }
    
    /**
     * 
     * Internal class - not really needed for this renderer.
     * 
     * @author andreas.schroeder
     */
    static class StackedXYBarRendererState extends XYItemRendererState {
        /**
         * @param info  the plot rendering info.
         */
        public StackedXYBarRendererState(PlotRenderingInfo info) {
            super(info);
        }
    }
    
    /**
     * Returns the range type.
     *
     * @return the range type.
     */
    public RangeType getRangeType() {
        return RangeType.STACKED;
    }

    /**
     * Returns the range of values the renderer requires to display all the items from the
     * specified dataset.
     * 
     * @param dataset  the dataset (<code>null</code> permitted).
     * 
     * @return The range (or <code>null</code> if the dataset is <code>null</code> or empty).
     */
    public Range getRangeExtent(XYDataset dataset) {
        return DatasetUtilities.getStackedRangeExtent((TableXYDataset) dataset);   
    }

    /**
     * Initialises the renderer and returns a state object that should be passed to all subsequent
     * calls to the drawItem() method. Here there is nothing to do.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area inside the axes.
     * @param plot  the plot.
     * @param data  the data.
     * @param info  an optional info collection object to return data back to the caller.
     *
     * @return a state object.
     */
    public XYItemRendererState initialise(
        Graphics2D g2,
        Rectangle2D dataArea,
        XYPlot plot,
        XYDataset data,
        PlotRenderingInfo info) {
        return new StackedXYBarRendererState(info);
    }

    /**
     * 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 plot 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 axis.
     * @param rangeAxis  the range 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) {
        if (!(dataset instanceof IntervalXYDataset && dataset instanceof TableXYDataset)) {
            String message = "dataset (type " + dataset.getClass().getName() + ") has wrong type:";
            boolean and = false;
            if (!IntervalXYDataset.class.isAssignableFrom(dataset.getClass())) {
                message += " it is no IntervalXYDataset";
                and = true;
            }
            if (!TableXYDataset.class.isAssignableFrom(dataset.getClass())) {
                if (and) {
                    message += " and";
                }
                message += " it is no TableXYDataset";
            }
            
            throw new IllegalArgumentException(message);
        }
        
        IntervalXYDataset intervalData = (IntervalXYDataset) dataset;

        Paint seriesPaint = getItemPaint(series, item);
        Paint seriesOutlinePaint = getItemOutlinePaint(series, item);

        //  Get height adjustment based on stack and translate to Java2D values
        double ph = this.getPreviousHeight(dataset, series, item);

        Number valueNumber = intervalData.getYValue(series, item);
        if (valueNumber == null) {
            return;
        }

        double translatedStartY = rangeAxis.valueToJava2D(ph, dataArea, plot.getRangeAxisEdge());

        double translatedEndY = rangeAxis.valueToJava2D(
            valueNumber.doubleValue() + ph, dataArea, plot.getRangeAxisEdge()
        );

        RectangleEdge location = plot.getDomainAxisEdge();
        Number startXNumber = intervalData.getStartXValue(series, item);
        if (startXNumber == null) {
            return;
        }
        double translatedStartX =
            domainAxis.valueToJava2D(startXNumber.doubleValue(), dataArea, location);

        Number endXNumber = intervalData.getEndXValue(series, item);
        if (endXNumber == null) {
            return;
        }
        double translatedEndX =
            domainAxis.valueToJava2D(endXNumber.doubleValue(), dataArea, location);

        double translatedWidth = Math.max(1, Math.abs(translatedEndX - translatedStartX));
        double translatedHeight = Math.abs(translatedEndY - translatedStartY);
        if (getMargin() > 0.0) {
            double cut = translatedWidth * getMargin();
            translatedWidth = translatedWidth - cut;
            translatedStartX = translatedStartX + cut / 2;
        }

        Rectangle2D bar = null;
        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            bar = new Rectangle2D.Double(
                Math.min(translatedStartY, translatedEndY),
                translatedEndX,
                translatedHeight,
                translatedWidth
            );
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            bar = new Rectangle2D.Double(
                translatedStartX,
                Math.min(translatedStartY, translatedEndY),
                translatedWidth,
                translatedHeight
            );
        }

        g2.setPaint(seriesPaint);
        g2.fill(bar);
        if (Math.abs(translatedEndX - translatedStartX) > 3) {
            g2.setStroke(getItemStroke(series, item));
            g2.setPaint(seriesOutlinePaint);
            g2.draw(bar);
        }

        // add an entity for the item...
        if (info != null) {
            EntityCollection entities = info.getOwner().getEntityCollection();
            if (entities != null) {
                String tip = null;
                XYToolTipGenerator generator = getToolTipGenerator(series, item);
                if (generator != null) {
                    tip = generator.generateToolTip(dataset, series, item);
                }
                String url = null;
                if (getURLGenerator() != null) {
                    url = getURLGenerator().generateURL(dataset, series, item);
                }
                XYItemEntity entity = new XYItemEntity(bar, dataset, series, item, tip, url);
                entities.addEntity(entity);
            }
        }
    }

    /**
     * Calculates the stacked value of the all series up to, but not including <code>series</code>
     * for the specified category, <code>category</code>.  It returns 0.0 if <code>series</code>
     * is the first series, i.e. 0.
     *
     * @param data  the data.
     * @param series  the series.
     * @param index  the index.
     *
     * @return double returns a cumulative value for all series' values up to
     * but excluding <code>series</code> for <code>index</code>.
     */
    protected double getPreviousHeight(XYDataset data, int series, int index) {
        double result = 0.0;

        Number tmp;
        for (int i = 0; i < series; i++) {
            tmp = data.getYValue(i, index);
            if (tmp != null) {
                result += tmp.doubleValue();
            }
        }
        return result;
    }
}