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jfreechart example source code file (SubCategoryAxis.java)

This example jfreechart source code file (SubCategoryAxis.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, axischangeevent, axisspace, axisstate, axisstate, categoryplot, font, geometry, illegalargumentexception, io, null, rectangle2d, rectangle2d, rectangleedge, rectangleedge, subcategoryaxis, subcategoryaxis, util

The jfreechart SubCategoryAxis.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * --------------------
 * SubCategoryAxis.java
 * --------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   Adriaan Joubert;
 *
 * Changes
 * -------
 * 12-May-2004 : Version 1 (DG);
 * 30-Sep-2004 : Moved drawRotatedString() from RefineryUtilities
 *               --> TextUtilities (DG);
 * 26-Apr-2005 : Removed logger (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 18-Aug-2006 : Fix for bug drawing category labels, thanks to Adriaan
 *               Joubert (1277726) (DG);
 * 30-May-2007 : Added argument check and event notification to
 *               addSubCategory() (DG);
 * 13-Nov-2008 : Fix NullPointerException when dataset is null - see bug
 *               report 2275695 (DG);
 *
 */

package org.jfree.chart.axis;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Iterator;
import java.util.List;

import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.data.category.CategoryDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.TextAnchor;

/**
 * A specialised category axis that can display sub-categories.
 */
public class SubCategoryAxis extends CategoryAxis
        implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -1279463299793228344L;

    /** Storage for the sub-categories (these need to be set manually). */
    private List subCategories;

    /** The font for the sub-category labels. */
    private Font subLabelFont = new Font("SansSerif", Font.PLAIN, 10);

    /** The paint for the sub-category labels. */
    private transient Paint subLabelPaint = Color.black;

    /**
     * Creates a new axis.
     *
     * @param label  the axis label.
     */
    public SubCategoryAxis(String label) {
        super(label);
        this.subCategories = new java.util.ArrayList();
    }

    /**
     * Adds a sub-category to the axis and sends an {@link AxisChangeEvent} to
     * all registered listeners.
     *
     * @param subCategory  the sub-category (<code>null not permitted).
     */
    public void addSubCategory(Comparable subCategory) {
        if (subCategory == null) {
            throw new IllegalArgumentException("Null 'subcategory' axis.");
        }
        this.subCategories.add(subCategory);
        notifyListeners(new AxisChangeEvent(this));
    }

    /**
     * Returns the font used to display the sub-category labels.
     *
     * @return The font (never <code>null).
     *
     * @see #setSubLabelFont(Font)
     */
    public Font getSubLabelFont() {
        return this.subLabelFont;
    }

    /**
     * Sets the font used to display the sub-category labels and sends an
     * {@link AxisChangeEvent} to all registered listeners.
     *
     * @param font  the font (<code>null not permitted).
     *
     * @see #getSubLabelFont()
     */
    public void setSubLabelFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        this.subLabelFont = font;
        notifyListeners(new AxisChangeEvent(this));
    }

    /**
     * Returns the paint used to display the sub-category labels.
     *
     * @return The paint (never <code>null).
     *
     * @see #setSubLabelPaint(Paint)
     */
    public Paint getSubLabelPaint() {
        return this.subLabelPaint;
    }

    /**
     * Sets the paint used to display the sub-category labels and sends an
     * {@link AxisChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null not permitted).
     *
     * @see #getSubLabelPaint()
     */
    public void setSubLabelPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.subLabelPaint = paint;
        notifyListeners(new AxisChangeEvent(this));
    }

    /**
     * Estimates the space required for the axis, given a specific drawing area.
     *
     * @param g2  the graphics device (used to obtain font information).
     * @param plot  the plot that the axis belongs to.
     * @param plotArea  the area within which the axis should be drawn.
     * @param edge  the axis location (top or bottom).
     * @param space  the space already reserved.
     *
     * @return The space required to draw the axis.
     */
    public AxisSpace reserveSpace(Graphics2D g2, Plot plot,
                                  Rectangle2D plotArea,
                                  RectangleEdge edge, AxisSpace space) {

        // create a new space object if one wasn't supplied...
        if (space == null) {
            space = new AxisSpace();
        }

        // if the axis is not visible, no additional space is required...
        if (!isVisible()) {
            return space;
        }

        space = super.reserveSpace(g2, plot, plotArea, edge, space);
        double maxdim = getMaxDim(g2, edge);
        if (RectangleEdge.isTopOrBottom(edge)) {
            space.add(maxdim, edge);
        }
        else if (RectangleEdge.isLeftOrRight(edge)) {
            space.add(maxdim, edge);
        }
        return space;
    }

    /**
     * Returns the maximum of the relevant dimension (height or width) of the
     * subcategory labels.
     *
     * @param g2  the graphics device.
     * @param edge  the edge.
     *
     * @return The maximum dimension.
     */
    private double getMaxDim(Graphics2D g2, RectangleEdge edge) {
        double result = 0.0;
        g2.setFont(this.subLabelFont);
        FontMetrics fm = g2.getFontMetrics();
        Iterator iterator = this.subCategories.iterator();
        while (iterator.hasNext()) {
            Comparable subcategory = (Comparable) iterator.next();
            String label = subcategory.toString();
            Rectangle2D bounds = TextUtilities.getTextBounds(label, g2, fm);
            double dim = 0.0;
            if (RectangleEdge.isLeftOrRight(edge)) {
                dim = bounds.getWidth();
            }
            else {  // must be top or bottom
                dim = bounds.getHeight();
            }
            result = Math.max(result, dim);
        }
        return result;
    }

    /**
     * Draws the axis on a Java 2D graphics device (such as the screen or a
     * printer).
     *
     * @param g2  the graphics device (<code>null not permitted).
     * @param cursor  the cursor location.
     * @param plotArea  the area within which the axis should be drawn
     *                  (<code>null not permitted).
     * @param dataArea  the area within which the plot is being drawn
     *                  (<code>null not permitted).
     * @param edge  the location of the axis (<code>null not permitted).
     * @param plotState  collects information about the plot
     *                   (<code>null permitted).
     *
     * @return The axis state (never <code>null).
     */
    public AxisState draw(Graphics2D g2,
                          double cursor,
                          Rectangle2D plotArea,
                          Rectangle2D dataArea,
                          RectangleEdge edge,
                          PlotRenderingInfo plotState) {

        // if the axis is not visible, don't draw it...
        if (!isVisible()) {
            return new AxisState(cursor);
        }

        if (isAxisLineVisible()) {
            drawAxisLine(g2, cursor, dataArea, edge);
        }

        // draw the category labels and axis label
        AxisState state = new AxisState(cursor);
        state = drawSubCategoryLabels(g2, plotArea, dataArea, edge, state, 
                plotState);
        state = drawCategoryLabels(g2, plotArea, dataArea, edge, state,
                plotState);
        state = drawLabel(getLabel(), g2, plotArea, dataArea, edge, state);

        return state;

    }

    /**
     * Draws the category labels and returns the updated axis state.
     *
     * @param g2  the graphics device (<code>null not permitted).
     * @param plotArea  the plot area (<code>null not permitted).
     * @param dataArea  the area inside the axes (<code>null not
     *                  permitted).
     * @param edge  the axis location (<code>null not permitted).
     * @param state  the axis state (<code>null not permitted).
     * @param plotState  collects information about the plot (<code>null
     *                   permitted).
     *
     * @return The updated axis state (never <code>null).
     */
    protected AxisState drawSubCategoryLabels(Graphics2D g2,
                                              Rectangle2D plotArea,
                                              Rectangle2D dataArea,
                                              RectangleEdge edge,
                                              AxisState state,
                                              PlotRenderingInfo plotState) {

        if (state == null) {
            throw new IllegalArgumentException("Null 'state' argument.");
        }

        g2.setFont(this.subLabelFont);
        g2.setPaint(this.subLabelPaint);
        CategoryPlot plot = (CategoryPlot) getPlot();
        int categoryCount = 0;
        CategoryDataset dataset = plot.getDataset();
        if (dataset != null) {
            categoryCount = dataset.getColumnCount();
        }

        double maxdim = getMaxDim(g2, edge);
        for (int categoryIndex = 0; categoryIndex < categoryCount;
             categoryIndex++) {

            double x0 = 0.0;
            double x1 = 0.0;
            double y0 = 0.0;
            double y1 = 0.0;
            if (edge == RectangleEdge.TOP) {
                x0 = getCategoryStart(categoryIndex, categoryCount, dataArea,
                        edge);
                x1 = getCategoryEnd(categoryIndex, categoryCount, dataArea,
                        edge);
                y1 = state.getCursor();
                y0 = y1 - maxdim;
            }
            else if (edge == RectangleEdge.BOTTOM) {
                x0 = getCategoryStart(categoryIndex, categoryCount, dataArea,
                        edge);
                x1 = getCategoryEnd(categoryIndex, categoryCount, dataArea,
                        edge);
                y0 = state.getCursor();
                y1 = y0 + maxdim;
            }
            else if (edge == RectangleEdge.LEFT) {
                y0 = getCategoryStart(categoryIndex, categoryCount, dataArea,
                        edge);
                y1 = getCategoryEnd(categoryIndex, categoryCount, dataArea,
                        edge);
                x1 = state.getCursor();
                x0 = x1 - maxdim;
            }
            else if (edge == RectangleEdge.RIGHT) {
                y0 = getCategoryStart(categoryIndex, categoryCount, dataArea,
                        edge);
                y1 = getCategoryEnd(categoryIndex, categoryCount, dataArea,
                        edge);
                x0 = state.getCursor();
                x1 = x0 + maxdim;
            }
            Rectangle2D area = new Rectangle2D.Double(x0, y0, (x1 - x0),
                    (y1 - y0));
            int subCategoryCount = this.subCategories.size();
            float width = (float) ((x1 - x0) / subCategoryCount);
            float height = (float) ((y1 - y0) / subCategoryCount);
            float xx = 0.0f;
            float yy = 0.0f;
            for (int i = 0; i < subCategoryCount; i++) {
                if (RectangleEdge.isTopOrBottom(edge)) {
                    xx = (float) (x0 + (i + 0.5) * width);
                    yy = (float) area.getCenterY();
                }
                else {
                    xx = (float) area.getCenterX();
                    yy = (float) (y0 + (i + 0.5) * height);
                }
                String label = this.subCategories.get(i).toString();
                TextUtilities.drawRotatedString(label, g2, xx, yy,
                        TextAnchor.CENTER, 0.0, TextAnchor.CENTER);
            }
        }

        if (edge.equals(RectangleEdge.TOP)) {
            double h = maxdim;
            state.cursorUp(h);
        }
        else if (edge.equals(RectangleEdge.BOTTOM)) {
            double h = maxdim;
            state.cursorDown(h);
        }
        else if (edge == RectangleEdge.LEFT) {
            double w = maxdim;
            state.cursorLeft(w);
        }
        else if (edge == RectangleEdge.RIGHT) {
            double w = maxdim;
            state.cursorRight(w);
        }
        return state;
    }

    /**
     * Tests the axis for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof SubCategoryAxis && super.equals(obj)) {
            SubCategoryAxis axis = (SubCategoryAxis) obj;
            if (!this.subCategories.equals(axis.subCategories)) {
                return false;
            }
            if (!this.subLabelFont.equals(axis.subLabelFont)) {
                return false;
            }
            if (!this.subLabelPaint.equals(axis.subLabelPaint)) {
                return false;
            }
            return true;
        }
        return false;
    }

    /**
     * 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.writePaint(this.subLabelPaint, stream);
    }

    /**
     * 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.subLabelPaint = SerialUtilities.readPaint(stream);
    }

}

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