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jfreechart example source code file (CategoryLabelPosition.java)

This example jfreechart source code file (CategoryLabelPosition.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

categorylabelposition, categorylabelposition, categorylabelwidthtype, categorylabelwidthtype, illegalargumentexception, io, null, null, rectangleanchor, serializable, textanchor, textblockanchor, textblockanchor

The jfreechart CategoryLabelPosition.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.]
 *
 * --------------------------
 * CategoryLabelPosition.java
 * --------------------------
 * (C) Copyright 2003-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 31-Oct-2003 : Version 1 (DG);
 * 17-Feb-2004 : Added new constructor (DG);
 * 23-Mar-2004 : Added width calculation parameters (DG);
 * 07-Jan-2005 : Fixed bug in equals() method (DG);
 * 11-Jan-2005 : Removed deprecated constructor in preparation for the 1.0.0
 *               release (DG);
 *
 */

package org.jfree.chart.axis;

import java.io.Serializable;

import org.jfree.text.TextBlockAnchor;
import org.jfree.ui.RectangleAnchor;
import org.jfree.ui.TextAnchor;

/**
 * The attributes that control the position of the labels for the categories on
 * a {@link CategoryAxis}. Instances of this class are immutable and other
 * JFreeChart classes rely upon this.
 */
public class CategoryLabelPosition implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 5168681143844183864L;

    /** The category anchor point. */
    private RectangleAnchor categoryAnchor;

    /** The text block anchor. */
    private TextBlockAnchor labelAnchor;

    /** The rotation anchor. */
    private TextAnchor rotationAnchor;

    /** The rotation angle (in radians). */
    private double angle;

    /** The width calculation type. */
    private CategoryLabelWidthType widthType;

    /**
     * The maximum label width as a percentage of the category space or the
     * range space.
     */
    private float widthRatio;

    /**
     * Creates a new position record with default settings.
     */
    public CategoryLabelPosition() {
        this(RectangleAnchor.CENTER, TextBlockAnchor.BOTTOM_CENTER,
                TextAnchor.CENTER, 0.0, CategoryLabelWidthType.CATEGORY, 0.95f);
    }

    /**
     * Creates a new category label position record.
     *
     * @param categoryAnchor  the category anchor (<code>null not
     *                        permitted).
     * @param labelAnchor  the label anchor (<code>null not permitted).
     */
    public CategoryLabelPosition(RectangleAnchor categoryAnchor,
                                 TextBlockAnchor labelAnchor) {
        // argument checking delegated...
        this(categoryAnchor, labelAnchor, TextAnchor.CENTER, 0.0,
                CategoryLabelWidthType.CATEGORY, 0.95f);
    }

    /**
     * Creates a new category label position record.
     *
     * @param categoryAnchor  the category anchor (<code>null not
     *                        permitted).
     * @param labelAnchor  the label anchor (<code>null not permitted).
     * @param widthType  the width type (<code>null not permitted).
     * @param widthRatio  the maximum label width as a percentage (of the
     *                    category space or the range space).
     */
    public CategoryLabelPosition(RectangleAnchor categoryAnchor,
                                 TextBlockAnchor labelAnchor,
                                 CategoryLabelWidthType widthType,
                                 float widthRatio) {
        // argument checking delegated...
        this(categoryAnchor, labelAnchor, TextAnchor.CENTER, 0.0, widthType,
                widthRatio);
    }

    /**
     * Creates a new position record.  The item label anchor is a point
     * relative to the data item (dot, bar or other visual item) on a chart.
     * The item label is aligned by aligning the text anchor with the item
     * label anchor.
     *
     * @param categoryAnchor  the category anchor (<code>null not
     *                        permitted).
     * @param labelAnchor  the label anchor (<code>null not permitted).
     * @param rotationAnchor  the rotation anchor (<code>null not
     *                        permitted).
     * @param angle  the rotation angle (<code>null not permitted).
     * @param widthType  the width type (<code>null not permitted).
     * @param widthRatio  the maximum label width as a percentage (of the
     *                    category space or the range space).
     */
    public CategoryLabelPosition(RectangleAnchor categoryAnchor,
                                 TextBlockAnchor labelAnchor,
                                 TextAnchor rotationAnchor,
                                 double angle,
                                 CategoryLabelWidthType widthType,
                                 float widthRatio) {

        if (categoryAnchor == null) {
            throw new IllegalArgumentException(
                    "Null 'categoryAnchor' argument.");
        }
        if (labelAnchor == null) {
            throw new IllegalArgumentException(
                    "Null 'labelAnchor' argument.");
        }
        if (rotationAnchor == null) {
            throw new IllegalArgumentException(
                    "Null 'rotationAnchor' argument.");
        }
        if (widthType == null) {
            throw new IllegalArgumentException("Null 'widthType' argument.");
        }

        this.categoryAnchor = categoryAnchor;
        this.labelAnchor = labelAnchor;
        this.rotationAnchor = rotationAnchor;
        this.angle = angle;
        this.widthType = widthType;
        this.widthRatio = widthRatio;

    }

    /**
     * Returns the item label anchor.
     *
     * @return The item label anchor (never <code>null).
     */
    public RectangleAnchor getCategoryAnchor() {
        return this.categoryAnchor;
    }

    /**
     * Returns the text block anchor.
     *
     * @return The text block anchor (never <code>null).
     */
    public TextBlockAnchor getLabelAnchor() {
        return this.labelAnchor;
    }

    /**
     * Returns the rotation anchor point.
     *
     * @return The rotation anchor point (never <code>null).
     */
    public TextAnchor getRotationAnchor() {
        return this.rotationAnchor;
    }

    /**
     * Returns the angle of rotation for the label.
     *
     * @return The angle (in radians).
     */
    public double getAngle() {
        return this.angle;
    }

    /**
     * Returns the width calculation type.
     *
     * @return The width calculation type (never <code>null).
     */
    public CategoryLabelWidthType getWidthType() {
        return this.widthType;
    }

    /**
     * Returns the ratio used to calculate the maximum category label width.
     *
     * @return The ratio.
     */
    public float getWidthRatio() {
        return this.widthRatio;
    }

    /**
     * Tests this instance 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 CategoryLabelPosition)) {
            return false;
        }
        CategoryLabelPosition that = (CategoryLabelPosition) obj;
        if (!this.categoryAnchor.equals(that.categoryAnchor)) {
            return false;
        }
        if (!this.labelAnchor.equals(that.labelAnchor)) {
            return false;
        }
        if (!this.rotationAnchor.equals(that.rotationAnchor)) {
            return false;
        }
        if (this.angle != that.angle) {
            return false;
        }
        if (this.widthType != that.widthType) {
            return false;
        }
        if (this.widthRatio != that.widthRatio) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code for this object.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 19;
        result = 37 * result + this.categoryAnchor.hashCode();
        result = 37 * result + this.labelAnchor.hashCode();
        result = 37 * result + this.rotationAnchor.hashCode();
        return result;
    }

}

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