stackedxyarearenderer.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.]
 *
 * --------------------------
 * StackedXYAreaRenderer.java
 * --------------------------
 * (C) Copyright 2003, 2004, by Richard Atkinson and Contributors.
 *
 * Original Author:  Richard Atkinson;
 * Contributor(s):   Christian W. Zuckschwerdt;
 *                   David Gilbert (for Object Refinery Limited);
 *
 * $Id: StackedXYAreaRenderer.java,v 1.10 2004/04/30 08:42:50 mungady Exp $
 *
 * Changes:
 * --------
 * 27-Jul-2003 : Initial version (RA);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 18-Aug-2003 : Now handles null values (RA);
 * 20-Aug-2003 : Implemented Cloneable, PublicCloneable and Serializable (DG);
 * 22-Sep-2003 : Changed to be a two pass renderer with optional shape Paint and Stroke (RA);
 * 07-Oct-2003 : Added renderer state (DG);
 * 10-Feb-2004 : Updated state object and changed drawItem() method to make overriding 
 *               easier (DG);
 * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState.  Renamed XYToolTipGenerator
 *               --> XYItemLabelGenerator (DG);
 *
 */

package org.jfree.chart.renderer;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import java.util.Stack;

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.chart.urls.XYURLGenerator;
import org.jfree.data.DatasetUtilities;
import org.jfree.data.Range;
import org.jfree.data.TableXYDataset;
import org.jfree.data.XYDataset;
import org.jfree.util.PublicCloneable;

/**
 * A stacked area renderer for the {@link XYPlot} class.
 * 
 * @author Richard Atkinson
 */
public class StackedXYAreaRenderer extends XYAreaRenderer 
                                   implements Cloneable, 
                                              PublicCloneable,
                                              Serializable {
    
    /**
     * A state object for use by this renderer.
     */
    static class StackedXYAreaRendererState extends XYItemRendererState {
        
        /** The area for the current series. */
        private Polygon seriesArea;
        
        /** The line. */
        private Line2D line;
        
        /** The points from the last series. */
        private Stack lastSeriesPoints;
        
        /** The points for the current series. */
        private Stack currentSeriesPoints;
        
        /**
         * Creates a new state for the renderer.
         * 
         * @param info  the plot rendering info.
         */
        public StackedXYAreaRendererState(PlotRenderingInfo info) {
            super(info);
            this.seriesArea = null;
            this.line = null;
            this.lastSeriesPoints = new Stack();
            this.currentSeriesPoints = null;
        }
        
        /**
         * Returns the series area.
         * 
         * @return the series area.
         */
        public Polygon getSeriesArea() {
            return this.seriesArea;
        }
        
        /**
         * Sets the series area.
         * 
         * @param area  the area.
         */
        public void setSeriesArea(Polygon area) {
            this.seriesArea = area;
        }
        
        /**
         * Returns the working line.
         * 
         * @return the working line.
         */
        public Line2D getLine() {
            return this.line;
        }
        
        /**
         * Returns the current series points.
         * 
         * @return the current series points.
         */
        public Stack getCurrentSeriesPoints() {
            return this.currentSeriesPoints;
        }
        
        /**
         * Sets the current series points.
         * 
         * @param points  the points.
         */
        public void setCurrentSeriesPoints(Stack points) {
            this.currentSeriesPoints = points;
        }
    
        /**
         * Returns the last series points.
         * 
         * @return the last series points.
         */
        public Stack getLastSeriesPoints() {
            return this.lastSeriesPoints;
        }
        
        /**
         * Sets the last series points.
         * 
         * @param points  the points.
         */
        public void setLastSeriesPoints(Stack points) {
            this.lastSeriesPoints = points;
        }
    
    }

    /** Custom Paint for drawing all shapes, if null defaults to series shapes */
    private Paint shapePaint = null;

    /** Custom Stroke for drawing all shapes, if null defaults to series strokes */
    private Stroke shapeStroke = null;

    /**
     * Creates a new renderer.
     */
    public StackedXYAreaRenderer() {
        this(AREA);
    }
    /**
     * Constructs a new renderer.
     *
     * @param type  the type of the renderer.
     */
    public StackedXYAreaRenderer(int type) {
        this(type, null, null);
    }

    /**
     * Constructs a new renderer.
     * <p>
     * To specify the type of renderer, use one of the constants: SHAPES, LINES,
     * SHAPES_AND_LINES, AREA or AREA_AND_SHAPES.
     *
     * @param type  the type of renderer.
     * @param labelGenerator  the tool tip generator to use.  <code>null</code> is none.
     * @param urlGenerator  the URL generator (null permitted).
     */
    public StackedXYAreaRenderer(int type,
                                 XYToolTipGenerator labelGenerator, XYURLGenerator urlGenerator) {

        super(type, labelGenerator, urlGenerator);
    }

    /**
     * Returns the range type.
     *
     * @return The range type (never <code>null</code>).
     */
    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.
     * <P>
     * This method will be called before the first item is rendered, giving the
     * renderer an opportunity to initialise any state information it wants to maintain.
     * The renderer can do nothing if it chooses.
     *
     * @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 that should be passed to subsequent calls to the drawItem() method.
     */
    public XYItemRendererState initialise(Graphics2D g2,
                                          Rectangle2D dataArea,
                                          XYPlot plot,
                                          XYDataset data,
                                          PlotRenderingInfo info) {

        return new StackedXYAreaRendererState(info);

    }

    /**
     * Returns the number of passes required by the renderer.
     * 
     * @return 2.
     */
    public int getPassCount() {
        return 2;
    }

    /**
     * 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.