categoryaxis3d.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 227 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.]
 *
 * -------------------
 * CategoryAxis3D.java
 * -------------------
 * (C) Copyright 2003-2005, by Klaus Rheinwald and Contributors.
 *
 * Original Author:  Klaus Rheinwald;
 * Contributor(s):   Tin Luu,
 *                   David Gilbert (for Object Refinery Limited);
 *
 * Changes
 * -------
 * 19-Feb-2003 : File creation;
 * 21-Mar-2003 : Added to JFreeChart CVS, see bug id 685501 for code 
 *               contribution from KR (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 13-May-2003 : Renamed HorizontalCategoryAxis3D --> CategoryAxis3D, and 
 *               modified to take into account the plot orientation (DG);
 * 14-Aug-2003 : Implemented Cloneable (DG);
 * 21-Aug-2003 : Fixed draw() method bugs (DG);
 * 22-Mar-2004 : Added workaround for bug 920959 (null pointer exception with 
 *               no renderer) (DG);
 *
 */

package org.jfree.chart.axis;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;

import org.jfree.chart.Effect3D;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.ui.RectangleEdge;

/**
 * An axis that displays categories and has a 3D effect.
 * Used for bar charts and line charts.
 *
 * @author Klaus Rheinwald
 */
public class CategoryAxis3D extends CategoryAxis 
                            implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 4114732251353700972L;
    
    /**
     * Creates a new axis.
     */
    public CategoryAxis3D() {
        this(null);
    }
    
    /**
     * Creates a new axis using default attribute values.
     *
     * @param label  the axis label (<code>null</code> permitted).
     */
    public CategoryAxis3D(String label) {
        super(label);
    }

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

        // calculate the adjusted data area taking into account the 3D effect...
        // this assumes that there is a 3D renderer, all this 3D effect is a 
        // bit of an ugly hack...
        CategoryPlot plot = (CategoryPlot) getPlot();

        Rectangle2D adjustedDataArea = new Rectangle2D.Double();
        if (plot.getRenderer() instanceof Effect3D) {
            Effect3D e3D = (Effect3D) plot.getRenderer();
            double adjustedX = dataArea.getMinX();
            double adjustedY = dataArea.getMinY();
            double adjustedW = dataArea.getWidth() - e3D.getXOffset();
            double adjustedH = dataArea.getHeight() - e3D.getYOffset();

            if (edge == RectangleEdge.LEFT || edge == RectangleEdge.BOTTOM) {
                adjustedY += e3D.getYOffset();
            }
            else if (edge == RectangleEdge.RIGHT || edge == RectangleEdge.TOP) {
                adjustedX += e3D.getXOffset();
            }
            adjustedDataArea.setRect(
                adjustedX, adjustedY, adjustedW, adjustedH
            );
        }
        else {
            adjustedDataArea.setRect(dataArea);   
        }

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

        return state;
        
    }
    
    /**
     * Returns the Java 2D coordinate for a category.
     * 
     * @param anchor  the anchor point.
     * @param category  the category index.
     * @param categoryCount  the category count.
     * @param area  the data area.
     * @param edge  the location of the axis.
     * 
     * @return The coordinate.
     */
    public double getCategoryJava2DCoordinate(CategoryAnchor anchor, 
                                              int category, 
                                              int categoryCount, 
                                              Rectangle2D area,
                                              RectangleEdge edge) {
    
        double result = 0.0;
        Rectangle2D adjustedArea = area;
        CategoryPlot plot = (CategoryPlot) getPlot();
        CategoryItemRenderer renderer = plot.getRenderer();
        if (renderer instanceof Effect3D) {
            Effect3D e3D = (Effect3D) renderer;
            double adjustedX = area.getMinX();
            double adjustedY = area.getMinY();
            double adjustedW = area.getWidth() - e3D.getXOffset();
            double adjustedH = area.getHeight() - e3D.getYOffset();

            if (edge == RectangleEdge.LEFT || edge == RectangleEdge.BOTTOM) {
                adjustedY += e3D.getYOffset();
            }
            else if (edge == RectangleEdge.RIGHT || edge == RectangleEdge.TOP) {
                adjustedX += e3D.getXOffset();
            }
            adjustedArea = new Rectangle2D.Double(
                adjustedX, adjustedY, adjustedW, adjustedH
            );
        }

        if (anchor == CategoryAnchor.START) {
            result = getCategoryStart(
                category, categoryCount, adjustedArea, edge
            );
        }
        else if (anchor == CategoryAnchor.MIDDLE) {
            result = getCategoryMiddle(
                category, categoryCount, adjustedArea, edge
            );
        }
        else if (anchor == CategoryAnchor.END) {
            result = getCategoryEnd(
                category, categoryCount, adjustedArea, edge
            );
        }
        return result;
                                                      
    }
                                              
    /**
     * Returns a clone of the axis.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException If the axis is not cloneable for 
     *         some reason.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
    
}