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org.jfree.chart.renderer.xy.StandardXYItemRenderer Maven / Gradle / Ivy

/* ===========================================================
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * ---------------------------
 * StandardXYItemRenderer.java
 * ---------------------------
 * (C) Copyright 2001-2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Mark Watson (www.markwatson.com);
 *                   Jonathan Nash;
 *                   Andreas Schneider;
 *                   Norbert Kiesel (for TBD Networks);
 *                   Christian W. Zuckschwerdt;
 *                   Bill Kelemen;
 *                   Nicolas Brodu (for Astrium and EADS Corporate Research 
 *                   Center);
 *
 * $Id: StandardXYItemRenderer.java,v 1.18.2.4 2005/11/28 12:06:35 mungady Exp $
 *
 * Changes:
 * --------
 * 19-Oct-2001 : Version 1, based on code by Mark Watson (DG);
 * 22-Oct-2001 : Renamed DataSource.java --> Dataset.java etc. (DG);
 * 21-Dec-2001 : Added working line instance to improve performance (DG);
 * 22-Jan-2002 : Added code to lock crosshairs to data points.  Based on code 
 *               by Jonathan Nash (DG);
 * 23-Jan-2002 : Added DrawInfo parameter to drawItem() method (DG);
 * 28-Mar-2002 : Added a property change listener mechanism so that the 
 *               renderer no longer needs to be immutable (DG);
 * 02-Apr-2002 : Modified to handle null values (DG);
 * 09-Apr-2002 : Modified draw method to return void.  Removed the translated 
 *               zero from the drawItem method.  Override the initialise() 
 *               method to calculate it (DG);
 * 13-May-2002 : Added code from Andreas Schneider to allow changing 
 *               shapes/colors per item (DG);
 * 24-May-2002 : Incorporated tooltips into chart entities (DG);
 * 25-Jun-2002 : Removed redundant code (DG);
 * 05-Aug-2002 : Incorporated URLs for HTML image maps into chart entities (RA);
 * 08-Aug-2002 : Added discontinuous lines option contributed by 
 *               Norbert Kiesel (DG);
 * 20-Aug-2002 : Added user definable default values to be returned by 
 *               protected methods unless overridden by a subclass (DG);
 * 23-Sep-2002 : Updated for changes in the XYItemRenderer interface (DG);
 * 02-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 25-Mar-2003 : Implemented Serializable (DG);
 * 01-May-2003 : Modified drawItem() method signature (DG);
 * 15-May-2003 : Modified to take into account the plot orientation (DG);
 * 29-Jul-2003 : Amended code that doesn't compile with JDK 1.2.2 (DG);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
 * 24-Aug-2003 : Added null/NaN checks in drawItem (BK);
 * 08-Sep-2003 : Fixed serialization (NB);
 * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
 * 21-Jan-2004 : Override for getLegendItem() method (DG);
 * 27-Jan-2004 : Moved working line into state object (DG);
 * 10-Feb-2004 : Changed drawItem() method to make cut-and-paste overriding 
 *               easier (DG);
 * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState.  Renamed 
 *               XYToolTipGenerator --> XYItemLabelGenerator (DG);
 * 08-Jun-2004 : Modified to use getX() and getY() methods (DG);
 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with 
 *               getYValue() (DG);
 * 25-Aug-2004 : Created addEntity() method in superclass (DG);
 * 08-Oct-2004 : Added 'gapThresholdType' as suggested by Mike Watts (DG);
 * 11-Nov-2004 : Now uses ShapeUtilities to translate shapes (DG);
 * 23-Feb-2005 : Fixed getLegendItem() method to show lines.  Fixed bug
 *               1077108 (shape not visible for first item in series) (DG);
 * 10-Apr-2005 : Fixed item label positioning with horizontal orientation (DG);
 * 20-Apr-2005 : Use generators for legend tooltips and URLs (DG);
 * 27-Apr-2005 : Use generator for series label in legend (DG);
 *
 */

package org.jfree.chart.renderer.xy;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.LegendItem;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.Plot;
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.xy.XYDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.BooleanList;
import org.jfree.util.BooleanUtilities;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;
import org.jfree.util.ShapeUtilities;
import org.jfree.util.UnitType;

/**
 * Standard item renderer for an {@link XYPlot}.  This class can draw (a) 
 * shapes at each point, or (b) lines between points, or (c) both shapes and 
 * lines.
 */
public class StandardXYItemRenderer extends AbstractXYItemRenderer 
                                    implements XYItemRenderer,
                                               Cloneable,
                                               PublicCloneable,
                                               Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -3271351259436865995L;
    
    /** Constant for the type of rendering (shapes only). */
    public static final int SHAPES = 1;

    /** Constant for the type of rendering (lines only). */
    public static final int LINES = 2;

    /** Constant for the type of rendering (shapes and lines). */
    public static final int SHAPES_AND_LINES = SHAPES | LINES;

    /** Constant for the type of rendering (images only). */
    public static final int IMAGES = 4;

    /** Constant for the type of rendering (discontinuous lines). */
    public static final int DISCONTINUOUS = 8;

    /** Constant for the type of rendering (discontinuous lines). */
    public static final int DISCONTINUOUS_LINES = LINES | DISCONTINUOUS;

    /** A flag indicating whether or not shapes are drawn at each XY point. */
    private boolean baseShapesVisible;

    /** A flag indicating whether or not lines are drawn between XY points. */
    private boolean plotLines;

    /** A flag indicating whether or not images are drawn between XY points. */
    private boolean plotImages;

    /** A flag controlling whether or not discontinuous lines are used. */
    private boolean plotDiscontinuous;

    /** Specifies how the gap threshold value is interpreted. */
    private UnitType gapThresholdType = UnitType.RELATIVE;
    
    /** Threshold for deciding when to discontinue a line. */
    private double gapThreshold = 1.0;

    /** A flag that controls whether or not shapes are filled for ALL series. */
    private Boolean shapesFilled;

    /** 
     * A table of flags that control (per series) whether or not shapes are 
     * filled. 
     */
    private BooleanList seriesShapesFilled;

    /** The default value returned by the getShapeFilled() method. */
    private boolean baseShapesFilled;

    /** 
     * A flag that controls whether or not each series is drawn as a single 
     * path. 
     */
    private boolean drawSeriesLineAsPath;

    /** 
     * The shape that is used to represent a line in the legend. 
     * This should never be set to null. 
     */
    private transient Shape legendLine;
    
    /**
     * Constructs a new renderer.
     */
    public StandardXYItemRenderer() {
        this(LINES, null);
    }

    /**
     * Constructs a new renderer.
     * 

* To specify the type of renderer, use one of the constants: SHAPES, LINES * or SHAPES_AND_LINES. * * @param type the type. */ public StandardXYItemRenderer(int type) { this(type, null); } /** * Constructs a new renderer. *

* To specify the type of renderer, use one of the constants: SHAPES, LINES * or SHAPES_AND_LINES. * * @param type the type of renderer. * @param toolTipGenerator the item label generator (null * permitted). */ public StandardXYItemRenderer(int type, XYToolTipGenerator toolTipGenerator) { this(type, toolTipGenerator, null); } /** * Constructs a new renderer. *

* To specify the type of renderer, use one of the constants: SHAPES, LINES * or SHAPES_AND_LINES. * * @param type the type of renderer. * @param toolTipGenerator the item label generator (null * permitted). * @param urlGenerator the URL generator. */ public StandardXYItemRenderer(int type, XYToolTipGenerator toolTipGenerator, XYURLGenerator urlGenerator) { super(); setToolTipGenerator(toolTipGenerator); setURLGenerator(urlGenerator); if ((type & SHAPES) != 0) { this.baseShapesVisible = true; } if ((type & LINES) != 0) { this.plotLines = true; } if ((type & IMAGES) != 0) { this.plotImages = true; } if ((type & DISCONTINUOUS) != 0) { this.plotDiscontinuous = true; } this.shapesFilled = null; this.seriesShapesFilled = new BooleanList(); this.baseShapesFilled = true; this.legendLine = new Line2D.Double(-7.0, 0.0, 7.0, 0.0); this.drawSeriesLineAsPath = false; } /** * Returns true if shapes are being plotted by the renderer. * * @return true if shapes are being plotted by the renderer. */ public boolean getBaseShapesVisible() { return this.baseShapesVisible; } /** * Sets the flag that controls whether or not a shape is plotted at each * data point. * * @param flag the flag. */ public void setBaseShapesVisible(boolean flag) { if (this.baseShapesVisible != flag) { this.baseShapesVisible = flag; notifyListeners(new RendererChangeEvent(this)); } } // SHAPES FILLED /** * Returns the flag used to control whether or not the shape for an item is * filled. *

* The default implementation passes control to the * getSeriesShapesFilled method. You can override this method * if you require different behaviour. * * @param series the series index (zero-based). * @param item the item index (zero-based). * * @return A boolean. */ public boolean getItemShapeFilled(int series, int item) { return getSeriesShapesFilled(series); } /** * Returns the flag used to control whether or not the shapes for a series * are filled. * * @param series the series index (zero-based). * * @return A boolean. */ public boolean getSeriesShapesFilled(int series) { // return the overall setting, if there is one... if (this.shapesFilled != null) { return this.shapesFilled.booleanValue(); } // otherwise look up the paint table Boolean flag = this.seriesShapesFilled.getBoolean(series); if (flag != null) { return flag.booleanValue(); } else { return this.baseShapesFilled; } } /** * Sets the 'shapes filled' for ALL series. * * @param filled the flag. */ public void setShapesFilled(boolean filled) { // here we use BooleanUtilities to remain compatible with JDKs < 1.4 setShapesFilled(BooleanUtilities.valueOf(filled)); } /** * Sets the 'shapes filled' for ALL series. * * @param filled the flag (null permitted). */ public void setShapesFilled(Boolean filled) { this.shapesFilled = filled; } /** * Sets the 'shapes filled' flag for a series. * * @param series the series index (zero-based). * @param flag the flag. */ public void setSeriesShapesFilled(int series, Boolean flag) { this.seriesShapesFilled.setBoolean(series, flag); } /** * Returns the base 'shape filled' attribute. * * @return The base flag. */ public boolean getBaseShapesFilled() { return this.baseShapesFilled; } /** * Sets the base 'shapes filled' flag. * * @param flag the flag. */ public void setBaseShapesFilled(boolean flag) { this.baseShapesFilled = flag; } /** * Returns true if lines are being plotted by the renderer. * * @return true if lines are being plotted by the renderer. */ public boolean getPlotLines() { return this.plotLines; } /** * Sets the flag that controls whether or not a line is plotted between * each data point. * * @param flag the flag. */ public void setPlotLines(boolean flag) { if (this.plotLines != flag) { this.plotLines = flag; notifyListeners(new RendererChangeEvent(this)); } } /** * Returns the gap threshold type (relative or absolute). * * @return The type. */ public UnitType getGapThresholdType() { return this.gapThresholdType; } /** * Sets the gap threshold type. * * @param thresholdType the type (null not permitted). */ public void setGapThresholdType(UnitType thresholdType) { if (thresholdType == null) { throw new IllegalArgumentException( "Null 'thresholdType' argument." ); } this.gapThresholdType = thresholdType; notifyListeners(new RendererChangeEvent(this)); } /** * Returns the gap threshold for discontinuous lines. * * @return The gap threshold. */ public double getGapThreshold() { return this.gapThreshold; } /** * Sets the gap threshold for discontinuous lines. * * @param t the threshold. */ public void setGapThreshold(double t) { this.gapThreshold = t; notifyListeners(new RendererChangeEvent(this)); } /** * Returns true if images are being plotted by the renderer. * * @return true if images are being plotted by the renderer. */ public boolean getPlotImages() { return this.plotImages; } /** * Sets the flag that controls whether or not an image is drawn at each * data point. * * @param flag the flag. */ public void setPlotImages(boolean flag) { if (this.plotImages != flag) { this.plotImages = flag; notifyListeners(new RendererChangeEvent(this)); } } /** * Returns true if lines should be discontinuous. * * @return true if lines should be discontinuous. */ public boolean getPlotDiscontinuous() { return this.plotDiscontinuous; } /** * Returns a flag that controls whether or not each series is drawn as a * single path. * * @return A boolean. */ public boolean getDrawSeriesLineAsPath() { return this.drawSeriesLineAsPath; } /** * Sets the flag that controls whether or not each series is drawn as a * single path. * * @param flag the flag. */ public void setDrawSeriesLineAsPath(boolean flag) { this.drawSeriesLineAsPath = flag; } /** * Returns the shape used to represent a line in the legend. * * @return The legend line (never null). */ public Shape getLegendLine() { return this.legendLine; } /** * Sets the shape used as a line in each legend item and sends a * {@link RendererChangeEvent} to all registered listeners. * * @param line the line (null not permitted). */ public void setLegendLine(Shape line) { if (line == null) { throw new IllegalArgumentException("Null 'line' argument."); } this.legendLine = line; notifyListeners(new RendererChangeEvent(this)); } /** * Returns a legend item for a series. * * @param datasetIndex the dataset index (zero-based). * @param series the series index (zero-based). * * @return A legend item for the series. */ public LegendItem getLegendItem(int datasetIndex, int series) { XYPlot plot = getPlot(); if (plot == null) { return null; } LegendItem result = null; XYDataset dataset = plot.getDataset(datasetIndex); if (dataset != null) { if (getItemVisible(series, 0)) { String label = getLegendItemLabelGenerator().generateLabel( dataset, series ); String description = label; String toolTipText = null; if (getLegendItemToolTipGenerator() != null) { toolTipText = getLegendItemToolTipGenerator().generateLabel( dataset, series ); } String urlText = null; if (getLegendItemURLGenerator() != null) { urlText = getLegendItemURLGenerator().generateLabel( dataset, series ); } Shape shape = getSeriesShape(series); boolean shapeFilled = getSeriesShapesFilled(series); Paint paint = getSeriesPaint(series); Paint linePaint = paint; Stroke lineStroke = getSeriesStroke(series); result = new LegendItem(label, description, toolTipText, urlText, this.baseShapesVisible, shape, shapeFilled, paint, !shapeFilled, paint, lineStroke, this.plotLines, this.legendLine, lineStroke, linePaint); } } return result; } /** * Records the state for the renderer. This is used to preserve state * information between calls to the drawItem() method for a single chart * drawing. */ public static class State extends XYItemRendererState { /** The path for the current series. */ public GeneralPath seriesPath; /** * A flag that indicates if the last (x, y) point was 'good' * (non-null). */ private boolean lastPointGood; /** * Creates a new state instance. * * @param info the plot rendering info. */ public State(PlotRenderingInfo info) { super(info); } /** * Returns a flag that indicates if the last point drawn (in the * current series) was 'good' (non-null). * * @return A boolean. */ public boolean isLastPointGood() { return this.lastPointGood; } /** * Sets a flag that indicates if the last point drawn (in the current * series) was 'good' (non-null). * * @param good the flag. */ public void setLastPointGood(boolean good) { this.lastPointGood = good; } } /** * Initialises the renderer. *

* 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 The renderer state. */ public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea, XYPlot plot, XYDataset data, PlotRenderingInfo info) { State state = new State(info); state.seriesPath = new GeneralPath(); return state; } /** * 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. * @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 * (null 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 (!getItemVisible(series, item)) { return; } // setup for collecting optional entity info... Shape entityArea = null; EntityCollection entities = null; if (info != null) { entities = info.getOwner().getEntityCollection(); } PlotOrientation orientation = plot.getOrientation(); Paint paint = getItemPaint(series, item); Stroke seriesStroke = getItemStroke(series, item); g2.setPaint(paint); g2.setStroke(seriesStroke); // get the data point... double x1 = dataset.getXValue(series, item); double y1 = dataset.getYValue(series, item); if (Double.isNaN(x1) || Double.isNaN(y1)) { return; } RectangleEdge xAxisLocation = plot.getDomainAxisEdge(); RectangleEdge yAxisLocation = plot.getRangeAxisEdge(); double transX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation); double transY1 = rangeAxis.valueToJava2D(y1, dataArea, yAxisLocation); if (getPlotLines()) { if (item == 0) { if (this.drawSeriesLineAsPath) { State s = (State) state; s.seriesPath.reset(); s.lastPointGood = false; } } if (this.drawSeriesLineAsPath) { State s = (State) state; // update path to reflect latest point if (!Double.isNaN(transX1) && !Double.isNaN(transY1)) { float x = (float) transX1; float y = (float) transY1; if (orientation == PlotOrientation.HORIZONTAL) { x = (float) transY1; y = (float) transX1; } if (s.isLastPointGood()) { // TODO: check threshold s.seriesPath.lineTo(x, y); } else { s.seriesPath.moveTo(x, y); } s.setLastPointGood(true); } else { s.setLastPointGood(false); } if (item == dataset.getItemCount(series) - 1) { // draw path g2.setStroke(getSeriesStroke(series)); g2.setPaint(getSeriesPaint(series)); g2.draw(s.seriesPath); } } else if (item != 0) { // get the previous data point... double x0 = dataset.getXValue(series, item - 1); double y0 = dataset.getYValue(series, item - 1); if (!Double.isNaN(x0) && !Double.isNaN(y0)) { boolean drawLine = true; if (getPlotDiscontinuous()) { // only draw a line if the gap between the current and // previous data point is within the threshold int numX = dataset.getItemCount(series); double minX = dataset.getXValue(series, 0); double maxX = dataset.getXValue(series, numX - 1); if (this.gapThresholdType == UnitType.ABSOLUTE) { drawLine = Math.abs(x1 - x0) <= this.gapThreshold; } else { drawLine = Math.abs(x1 - x0) <= ((maxX - minX) / numX * getGapThreshold()); } } if (drawLine) { double transX0 = domainAxis.valueToJava2D( x0, dataArea, xAxisLocation ); double transY0 = rangeAxis.valueToJava2D( y0, dataArea, yAxisLocation ); // only draw if we have good values if (Double.isNaN(transX0) || Double.isNaN(transY0) || Double.isNaN(transX1) || Double.isNaN(transY1)) { return; } if (orientation == PlotOrientation.HORIZONTAL) { state.workingLine.setLine( transY0, transX0, transY1, transX1 ); } else if (orientation == PlotOrientation.VERTICAL) { state.workingLine.setLine( transX0, transY0, transX1, transY1 ); } if (state.workingLine.intersects(dataArea)) { g2.draw(state.workingLine); } } } } } if (getBaseShapesVisible()) { Shape shape = getItemShape(series, item); if (orientation == PlotOrientation.HORIZONTAL) { shape = ShapeUtilities.createTranslatedShape( shape, transY1, transX1 ); } else if (orientation == PlotOrientation.VERTICAL) { shape = ShapeUtilities.createTranslatedShape( shape, transX1, transY1 ); } if (shape.intersects(dataArea)) { if (getItemShapeFilled(series, item)) { g2.fill(shape); } else { g2.draw(shape); } } entityArea = shape; } if (getPlotImages()) { Image image = getImage(plot, series, item, transX1, transY1); if (image != null) { Point hotspot = getImageHotspot( plot, series, item, transX1, transY1, image ); g2.drawImage( image, (int) (transX1 - hotspot.getX()), (int) (transY1 - hotspot.getY()), null ); entityArea = new Rectangle2D.Double( transX1 - hotspot.getX(), transY1 - hotspot.getY(), image.getWidth(null), image.getHeight(null) ); } } // draw the item label if there is one... if (isItemLabelVisible(series, item)) { double xx = transX1; double yy = transY1; if (orientation == PlotOrientation.HORIZONTAL) { xx = transY1; yy = transX1; } drawItemLabel( g2, orientation, dataset, series, item, xx, yy, (y1 < 0.0) ); } updateCrosshairValues( crosshairState, x1, y1, transX1, transY1, orientation ); // add an entity for the item... if (entities != null) { addEntity( entities, entityArea, dataset, series, item, transX1, transY1 ); } } /** * Tests this renderer for equality with another object. * * @param obj the object (null permitted). * * @return A boolean. */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof StandardXYItemRenderer)) { return false; } if (!super.equals(obj)) { return false; } StandardXYItemRenderer that = (StandardXYItemRenderer) obj; if (this.baseShapesVisible != that.baseShapesVisible) { return false; } if (this.plotLines != that.plotLines) { return false; } if (this.plotImages != that.plotImages) { return false; } if (this.plotDiscontinuous != that.plotDiscontinuous) { return false; } if (this.gapThresholdType != that.gapThresholdType) { return false; } if (this.gapThreshold != that.gapThreshold) { return false; } if (!ObjectUtilities.equal(this.shapesFilled, that.shapesFilled)) { return false; } if (!ShapeUtilities.equal(this.legendLine, that.legendLine)) { return false; } return true; } /** * 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(); } //////////////////////////////////////////////////////////////////////////// // PROTECTED METHODS // These provide the opportunity to subclass the standard renderer and // create custom effects. //////////////////////////////////////////////////////////////////////////// /** * Returns the image used to draw a single data item. * * @param plot the plot (can be used to obtain standard color information * etc). * @param series the series index. * @param item the item index. * @param x the x value of the item. * @param y the y value of the item. * * @return The image. */ protected Image getImage(Plot plot, int series, int item, double x, double y) { // should this be added to the plot as well ? // return plot.getShape(series, item, x, y, scale); // or should this be left to the user - like this: return null; } /** * Returns the hotspot of the image used to draw a single data item. * The hotspot is the point relative to the top left of the image * that should indicate the data item. The default is the center of the * image. * * @param plot the plot (can be used to obtain standard color information * etc). * @param image the image (can be used to get size information about the * image) * @param series the series index * @param item the item index * @param x the x value of the item * @param y the y value of the item * * @return The hotspot used to draw the data item. */ protected Point getImageHotspot(Plot plot, int series, int item, double x, double y, Image image) { int height = image.getHeight(null); int width = image.getWidth(null); return new Point(width / 2, height / 2); } /** * Provides serialization support. * * @param stream the input stream. * * @throws IOException if there is an I/O error. * @throws ClassNotFoundException if there is a classpath problem. */ private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException { stream.defaultReadObject(); this.legendLine = SerialUtilities.readShape(stream); } /** * Provides serialization support. * * @param stream the output stream. * * @throws IOException if there is an I/O error. */ private void writeObject(ObjectOutputStream stream) throws IOException { stream.defaultWriteObject(); SerialUtilities.writeShape(this.legendLine, stream); } }





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