highlowrenderer.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.]
 *
 * --------------------
 * HighLowRenderer.java
 * --------------------
 * (C) Copyright 2001-2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Richard Atkinson;
 *                   Christian W. Zuckschwerdt;
 *
 * $Id: HighLowRenderer.java,v 1.25 2004/04/15 13:38:23 mungady Exp $
 *
 * Changes
 * -------
 * 13-Dec-2001 : Version 1 (DG);
 * 23-Jan-2002 : Added DrawInfo parameter to drawItem(...) method (DG);
 * 28-Mar-2002 : Added a property change listener mechanism so that renderers no longer need to be
 *               immutable (DG);
 * 09-Apr-2002 : Removed translatedRangeZero from the drawItem(...) method, and changed the return
 *               type of the drawItem method to void, reflecting a change in the XYItemRenderer
 *               interface.  Added tooltip code to drawItem(...) method (DG);
 * 05-Aug-2002 : Small modification to drawItem method to support URLs for HTML image maps (RA);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified drawItem(...) method signature (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 31-Jul-2003 : Deprecated constructor (DG);
 * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 29-Jan-2004 : Fixed bug (882392) when rendering with PlotOrientation.HORIZONTAL (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.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.event.RendererChangeEvent;
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.HighLowDataset;
import org.jfree.data.XYDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;

/**
 * A renderer that draws high/low/open/close markers on an {@link XYPlot} (requires
 * a {@link HighLowDataset}).
 * <P>
 * This renderer does not include code to calculate the crosshair point for the plot.
 */
public class HighLowRenderer extends AbstractXYItemRenderer
                             implements XYItemRenderer,
                                        Cloneable,
                                        PublicCloneable,
                                        Serializable {
    
    /** A flag that controls whether the open ticks are drawn. */
    private boolean drawOpenTicks;

    /** A flag that controls whether the close ticks are drawn. */
    private boolean drawCloseTicks;

    /**
     * The default constructor.
     */
    public HighLowRenderer() {
        super();
        this.drawOpenTicks = true;
        this.drawCloseTicks = true;
    }

    /**
     * Returns the flag that controls whether open ticks are drawn.
     * 
     * @return A boolean.
     */
    public boolean getDrawOpenTicks() {
        return this.drawOpenTicks;
    }
    
    /**
     * Sets the flag that controls whether open ticks are drawn, and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param draw  the flag.
     */
    public void setDrawOpenTicks(boolean draw) {
        this.drawOpenTicks = draw;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the flag that controls whether close ticks are drawn.
     * 
     * @return A boolean.
     */
    public boolean getDrawCloseTicks() {
        return this.drawCloseTicks;
    }
    
    /**
     * Sets the flag that controls whether close ticks are drawn, and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param draw  the flag.
     */
    public void setDrawCloseTicks(boolean draw) {
        this.drawCloseTicks = draw;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * 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) {

        // first make sure we have a valid x value...
        Number x = dataset.getXValue(series, item);
        if (x == null) {  
            return;    // if x is null, we can't do anything
        }
        double xdouble = x.doubleValue();
        if (!domainAxis.getRange().contains(xdouble)) {
            return;    // the x value is not within the axis range
        }
        double xx = domainAxis.valueToJava2D(xdouble, dataArea, plot.getDomainAxisEdge());
        
        // setup for collecting optional entity info...
        Shape entityArea = null;
        EntityCollection entities = null;
        if (info != null) {
            entities = info.getOwner().getEntityCollection();
        }

        PlotOrientation orientation = plot.getOrientation();
        RectangleEdge location = plot.getRangeAxisEdge();

        Paint p = getItemPaint(series, item);
        Stroke s = getItemStroke(series, item);
        g2.setPaint(p);
        g2.setStroke(s);
        
        if (dataset instanceof HighLowDataset) {
            HighLowDataset hld = (HighLowDataset) dataset;
            
            Number yHigh = hld.getHighValue(series, item);
            Number yLow = hld.getLowValue(series, item);
            if (yHigh != null && yLow != null) {
                double yyHigh = rangeAxis.valueToJava2D(yHigh.doubleValue(), dataArea, location);
                double yyLow = rangeAxis.valueToJava2D(yLow.doubleValue(), dataArea, location);
                if (orientation == PlotOrientation.HORIZONTAL) {
                    g2.draw(new Line2D.Double(yyLow, xx, yyHigh, xx));
                    entityArea = new Rectangle2D.Double(
                        Math.min(yyLow, yyHigh), xx - 1.0,  Math.abs(yyHigh - yyLow), 2.0
                    );
                }
                else if (orientation == PlotOrientation.VERTICAL) {
                    g2.draw(new Line2D.Double(xx, yyLow, xx, yyHigh));   
                    entityArea = new Rectangle2D.Double(
                        xx - 1.0, Math.min(yyLow, yyHigh), 2.0,  Math.abs(yyHigh - yyLow)
                    );
                }
            }
            
            double delta = 2.0;
            if (domainAxis.isInverted()) {
                delta = -delta;
            }
            if (getDrawOpenTicks()) {
            Number yOpen = hld.getOpenValue(series, item);
                if (yOpen != null) {
                    double yyOpen = rangeAxis.valueToJava2D(
                        yOpen.doubleValue(), dataArea, location
                    );
                    if (orientation == PlotOrientation.HORIZONTAL) {
                        g2.draw(new Line2D.Double(yyOpen, xx + delta, yyOpen, xx));   
                    }
                    else if (orientation == PlotOrientation.VERTICAL) {
                        g2.draw(new Line2D.Double(xx - delta, yyOpen, xx, yyOpen));   
                    }
                }
            }
            
            if (getDrawCloseTicks()) {
                Number yClose = hld.getCloseValue(series, item);
                if (yClose != null) {
                    double yyClose = rangeAxis.valueToJava2D(
                        yClose.doubleValue(), dataArea, location
                    );
                    if (orientation == PlotOrientation.HORIZONTAL) {
                        g2.draw(new Line2D.Double(yyClose, xx, yyClose, xx - delta));   
                    }
                    else if (orientation == PlotOrientation.VERTICAL) {
                        g2.draw(new Line2D.Double(xx, yyClose, xx + delta, yyClose));   
                    }
                }
            }
  
        }
        else {
            // not a HighLowDataset, so just draw a line connecting this point with the previous
            // point...
            if (item > 0) {
                Number x0 = dataset.getXValue(series, item - 1);
                Number y0 = dataset.getYValue(series, item - 1);
                Number y = dataset.getYValue(series, item);
                if (x0 == null || y0 == null || y == null) {
                    return;
                }
                double xx0 = domainAxis.valueToJava2D(
                    x0.doubleValue(), dataArea, plot.getDomainAxisEdge()
                );
                double yy0 = rangeAxis.valueToJava2D(y0.doubleValue(), dataArea, location);
                double yy = rangeAxis.valueToJava2D(y.doubleValue(), dataArea, location);
                if (orientation == PlotOrientation.HORIZONTAL) {
                    g2.draw(new Line2D.Double(yy0, xx0, yy, xx));
                }
                else if (orientation == PlotOrientation.VERTICAL) {
                    g2.draw(new Line2D.Double(xx0, yy0, xx, yy));
                }
            }
        }
        
        // add an entity for the item...
        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(entityArea, dataset, series, item, tip, url);
            entities.addEntity(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();
    }

}