pielabelrecord.java

jfreechart安装程序和使用说明

/* ===========================================================
 * 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.]
 *
 * -------------------
 * PieLabelRecord.java
 * -------------------
 * (C) Copyright 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: PieLabelRecord.java,v 1.1 2004/08/31 14:39:21 mungady Exp $
 *
 * Changes
 * -------
 * 08-Mar-2004 : Version 1 (DG);
 *
 */

package org.jfree.chart.plot;

import org.jfree.text.TextBox;

/**
 * A structure that retains information about the label for a section in a pie chart.
 */
public class PieLabelRecord implements Comparable {
    
    /** The key. */
    private Comparable key;
    
    /** The angle. */
    private double angle;
    
    /** The base y-coordinate. */
    private double baseY;
    
    /** The allocated y-coordinate. */
    private double allocatedY;

    /** The label. */
    private TextBox label;
    
    /** The label height. */
    private double labelHeight;
    
    /** The gap. */
    private double gap;
    
    /** The link percent. */
    private double linkPercent;
    
    /**
     * Creates a new record.
     * 
     * @param key  the key.
     * @param angle  the angle.
     * @param baseY  the base y-coordinate.
     * @param label  the label.
     * @param labelHeight  the label height (in Java2D units).
     * @param gap  the gap.
     * @param linkPercent  the link percent.
     */
    public PieLabelRecord(Comparable key, double angle, double baseY, TextBox label, 
                          double labelHeight, double gap, double linkPercent) {
        this.key = key;
        this.angle = angle;
        this.baseY = baseY;
        this.allocatedY = baseY;
        this.label = label;
        this.labelHeight = labelHeight;
        this.gap = gap;
        this.linkPercent = linkPercent;
    }
    
    /**
     * Returns the base y-coordinate.  This is where the label will appear if there is no 
     * overlapping of labels.
     * 
     * @return the base y-coordinate.
     */
    public double getBaseY() {
        return this.baseY;   
    }
    
    /**
     * Sets the base y-coordinate.
     * 
     * @param base  the base y-coordinate.
     */
    public void setBaseY(double base) {
        this.baseY = base;   
    }
    
    /**
     * Returns the lower bound of the label.
     * 
     * @return the lower bound.
     */
    public double getLowerY() {
        return this.allocatedY - this.labelHeight / 2.0;   
    }
    
    /**
     * Returns the upper bound of the label.
     * 
     * @return the upper bound.
     */
    public double getUpperY() {
        return this.allocatedY + this.labelHeight / 2.0;   
    }
    
    /**
     * Returns the angle.
     * 
     * @return the angle.
     */
    public double getAngle() {
        return this.angle;   
    }
    
    /**
     * Returns the key for the section that the label applies to.
     * 
     * @return the key.
     */
    public Comparable getKey() {
        return this.key;   
    }
    
    /**
     * Returns the label.
     * 
     * @return the label.
     */
    public TextBox getLabel() {
        return this.label;   
    }
    
    /**
     * Returns the label height.
     * 
     * @return The label height (in Java2D units).
     */
    public double getLabelHeight() {
        return this.labelHeight;   
    }
    
    /**
     * Returns the allocated y-coordinate.
     * 
     * @return the allocated y-coordinate.
     */
    public double getAllocatedY() {
        return this.allocatedY;   
    }
    
    /**
     * Sets the allocated y-coordinate.
     * 
     * @param y  the y-coordinate.
     */
    public void setAllocatedY(double y) {
        this.allocatedY = y;   
    }
    
    /**
     * Returns the gap.
     * 
     * @return the gap.
     */
    public double getGap() {
        return this.gap;   
    }
    
    /**
     * Returns the link percent.
     * 
     * @return the link percent.
     */
    public double getLinkPercent() {
        return this.linkPercent;   
    }
    /**
     * Compares this object to an arbitrary object.
     * 
     * @param obj  the object to compare against.
     * 
     * @return an integer that specifies the relative order of the two objects.
     */
    public int compareTo(Object obj) {
        int result = 0;
        if (obj instanceof PieLabelRecord) {
            PieLabelRecord plr = (PieLabelRecord) obj;
            if (this.baseY < plr.baseY) {
                result = -1;   
            }
            else if (this.baseY > plr.baseY) {
                result = 1;   
            }
        }
        return result;
    }
    
    /**
     * Returns a string describing the object.  This is used for debugging only.
     * 
     * @return a string.
     */
    public String toString() {
        return this.baseY + ", " + this.key.toString();   
    }
}