yintervalrenderer.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 202 行

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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.]
 *
 * ----------------------
 * YIntervalRenderer.java
 * ----------------------
 * (C) Copyright 2002-2005, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: YIntervalRenderer.java,v 1.7 2005/05/19 14:01:52 mungady Exp $
 *
 * Changes
 * -------
 * 05-Nov-2002 : Version 1 (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified drawItem() method signature (DG);
 * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
 * 27-Sep-2004 : Access double values from dataset (DG);
 * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
 * 
 */

package org.jfree.chart.renderer.xy;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

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.xy.IntervalXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;

/**
 * A renderer that draws a line connecting the start and end Y values for an 
 * {@link XYPlot}.
 */
public class YIntervalRenderer extends AbstractXYItemRenderer 
                               implements XYItemRenderer, 
                                          Cloneable,
                                          PublicCloneable,
                                          Serializable {

    private static final long serialVersionUID = -2951586537224143260L;
    
    /**
     * The default constructor.
     */
    public YIntervalRenderer() {
        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 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 (ignored here).
     */
    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) {

        // setup for collecting optional entity info...
        Shape entityArea = null;
        EntityCollection entities = null;
        if (info != null) {
            entities = info.getOwner().getEntityCollection();
        }

        IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset;

        double x = intervalDataset.getXValue(series, item);
        double yLow   = intervalDataset.getStartYValue(series, item);
        double yHigh  = intervalDataset.getEndYValue(series, item);

        RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
        RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
        
        double xx = domainAxis.valueToJava2D(x, dataArea, xAxisLocation);
        double yyLow = rangeAxis.valueToJava2D(yLow, dataArea, yAxisLocation);
        double yyHigh = rangeAxis.valueToJava2D(yHigh, dataArea, yAxisLocation);

        Paint p = getItemPaint(series, item);
        Stroke s = getItemStroke(series, item);
        
        Line2D line = null;
        Shape shape = getItemShape(series, item);
        Shape top = null;
        Shape bottom = null;
        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            line = new Line2D.Double(yyLow, xx, yyHigh, xx);
            top = ShapeUtilities.createTranslatedShape(shape, yyHigh, xx);
            bottom = ShapeUtilities.createTranslatedShape(shape, yyLow, xx);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            line = new Line2D.Double(xx, yyLow, xx, yyHigh);
            top = ShapeUtilities.createTranslatedShape(shape, xx, yyHigh);
            bottom = ShapeUtilities.createTranslatedShape(shape, xx, yyLow);
        }
        g2.setPaint(p);
        g2.setStroke(s);
        g2.draw(line);

        g2.fill(top);
        g2.fill(bottom);

        // add an entity for the item...
        if (entities != null) {
            if (entityArea == null) {
                entityArea = line.getBounds();
            }
            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(
                entityArea, dataset, series, item, tip, url
            );
            entities.add(entity);
        }

    }
    
    /**
     * 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();
    }

}