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jfreechart example source code file (CategoryLabelPositions.java)

This example jfreechart source code file (CategoryLabelPositions.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

bottom, categorylabelposition, categorylabelposition, categorylabelpositions, categorylabelpositions, down_90, illegalargumentexception, illegalargumentexception, io, left, null, null, right, serializable, top

The jfreechart CategoryLabelPositions.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.]
 *
 * ---------------------------
 * CategoryLabelPositions.java
 * ---------------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 06-Jan-2004 : Version 1 (DG);
 * 17-Feb-2004 : Added equals() method (DG);
 * 05-Nov-2004 : Adjusted settings for UP_90 and DOWN_90 (DG);
 *
 */

package org.jfree.chart.axis;

import java.io.Serializable;

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

/**
 * Records the label positions for a category axis.  Instances of this class
 * are immutable.
 */
public class CategoryLabelPositions implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -8999557901920364580L;

    /** STANDARD category label positions. */
    public static final CategoryLabelPositions
        STANDARD = new CategoryLabelPositions(
            new CategoryLabelPosition(
                RectangleAnchor.BOTTOM, TextBlockAnchor.BOTTOM_CENTER
            ), // TOP
            new CategoryLabelPosition(
                RectangleAnchor.TOP, TextBlockAnchor.TOP_CENTER
            ), // BOTTOM
            new CategoryLabelPosition(
                RectangleAnchor.RIGHT, TextBlockAnchor.CENTER_RIGHT,
                CategoryLabelWidthType.RANGE, 0.30f
            ), // LEFT
            new CategoryLabelPosition(
                RectangleAnchor.LEFT, TextBlockAnchor.CENTER_LEFT,
                CategoryLabelWidthType.RANGE, 0.30f
            ) // RIGHT
        );

    /** UP_90 category label positions. */
    public static final CategoryLabelPositions
        UP_90 = new CategoryLabelPositions(
            new CategoryLabelPosition(
                RectangleAnchor.BOTTOM, TextBlockAnchor.CENTER_LEFT,
                TextAnchor.CENTER_LEFT, -Math.PI / 2.0,
                CategoryLabelWidthType.RANGE, 0.30f
            ), // TOP
            new CategoryLabelPosition(
                RectangleAnchor.TOP, TextBlockAnchor.CENTER_RIGHT,
                TextAnchor.CENTER_RIGHT, -Math.PI / 2.0,
                CategoryLabelWidthType.RANGE, 0.30f
            ), // BOTTOM
            new CategoryLabelPosition(
                RectangleAnchor.RIGHT, TextBlockAnchor.BOTTOM_CENTER,
                TextAnchor.BOTTOM_CENTER, -Math.PI / 2.0,
                CategoryLabelWidthType.CATEGORY, 0.9f
            ), // LEFT
            new CategoryLabelPosition(
                RectangleAnchor.LEFT, TextBlockAnchor.TOP_CENTER,
                TextAnchor.TOP_CENTER, -Math.PI / 2.0,
                CategoryLabelWidthType.CATEGORY, 0.90f
            ) // RIGHT
        );

    /** DOWN_90 category label positions. */
    public static final CategoryLabelPositions
        DOWN_90 = new CategoryLabelPositions(
            new CategoryLabelPosition(
                RectangleAnchor.BOTTOM, TextBlockAnchor.CENTER_RIGHT,
                TextAnchor.CENTER_RIGHT, Math.PI / 2.0,
                CategoryLabelWidthType.RANGE, 0.30f
            ), // TOP
            new CategoryLabelPosition(
                RectangleAnchor.TOP, TextBlockAnchor.CENTER_LEFT,
                TextAnchor.CENTER_LEFT, Math.PI / 2.0,
                CategoryLabelWidthType.RANGE, 0.30f
            ), // BOTTOM
            new CategoryLabelPosition(
                RectangleAnchor.RIGHT, TextBlockAnchor.TOP_CENTER,
                TextAnchor.TOP_CENTER, Math.PI / 2.0,
                CategoryLabelWidthType.CATEGORY, 0.90f
            ), // LEFT
            new CategoryLabelPosition(
                RectangleAnchor.LEFT, TextBlockAnchor.BOTTOM_CENTER,
                TextAnchor.BOTTOM_CENTER, Math.PI / 2.0,
                CategoryLabelWidthType.CATEGORY, 0.90f
            ) // RIGHT
        );

    /** UP_45 category label positions. */
    public static final CategoryLabelPositions UP_45
        = createUpRotationLabelPositions(Math.PI / 4.0);

    /** DOWN_45 category label positions. */
    public static final CategoryLabelPositions DOWN_45
        = createDownRotationLabelPositions(Math.PI / 4.0);

    /**
     * Creates a new instance where the category labels angled upwards by the
     * specified amount.
     *
     * @param angle  the rotation angle (should be < Math.PI / 2.0).
     *
     * @return A category label position specification.
     */
    public static CategoryLabelPositions createUpRotationLabelPositions(
            double angle) {
        return new CategoryLabelPositions(
            new CategoryLabelPosition(
                RectangleAnchor.BOTTOM, TextBlockAnchor.BOTTOM_LEFT,
                TextAnchor.BOTTOM_LEFT, -angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ), // TOP
            new CategoryLabelPosition(
                RectangleAnchor.TOP, TextBlockAnchor.TOP_RIGHT,
                TextAnchor.TOP_RIGHT, -angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ), // BOTTOM
            new CategoryLabelPosition(
                RectangleAnchor.RIGHT, TextBlockAnchor.BOTTOM_RIGHT,
                TextAnchor.BOTTOM_RIGHT, -angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ), // LEFT
            new CategoryLabelPosition(
                RectangleAnchor.LEFT, TextBlockAnchor.TOP_LEFT,
                TextAnchor.TOP_LEFT, -angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ) // RIGHT
        );
    }

    /**
     * Creates a new instance where the category labels angled downwards by the
     * specified amount.
     *
     * @param angle  the rotation angle (should be < Math.PI / 2.0).
     *
     * @return A category label position specification.
     */
    public static CategoryLabelPositions createDownRotationLabelPositions(
            double angle) {
        return new CategoryLabelPositions(
            new CategoryLabelPosition(
                RectangleAnchor.BOTTOM, TextBlockAnchor.BOTTOM_RIGHT,
                TextAnchor.BOTTOM_RIGHT, angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ), // TOP
            new CategoryLabelPosition(
                RectangleAnchor.TOP, TextBlockAnchor.TOP_LEFT,
                TextAnchor.TOP_LEFT, angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ), // BOTTOM
            new CategoryLabelPosition(
                RectangleAnchor.RIGHT, TextBlockAnchor.TOP_RIGHT,
                TextAnchor.TOP_RIGHT, angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ), // LEFT
            new CategoryLabelPosition(
                RectangleAnchor.LEFT, TextBlockAnchor.BOTTOM_LEFT,
                TextAnchor.BOTTOM_LEFT, angle,
                CategoryLabelWidthType.RANGE, 0.50f
            ) // RIGHT
        );
    }

    /**
     * The label positioning details used when an axis is at the top of a
     * chart.
     */
    private CategoryLabelPosition positionForAxisAtTop;

    /**
     * The label positioning details used when an axis is at the bottom of a
     * chart.
     */
    private CategoryLabelPosition positionForAxisAtBottom;

    /**
     * The label positioning details used when an axis is at the left of a
     * chart.
     */
    private CategoryLabelPosition positionForAxisAtLeft;

    /**
     * The label positioning details used when an axis is at the right of a
     * chart.
     */
    private CategoryLabelPosition positionForAxisAtRight;

    /**
     * Default constructor.
     */
    public CategoryLabelPositions() {
        this.positionForAxisAtTop = new CategoryLabelPosition();
        this.positionForAxisAtBottom = new CategoryLabelPosition();
        this.positionForAxisAtLeft = new CategoryLabelPosition();
        this.positionForAxisAtRight = new CategoryLabelPosition();
    }

    /**
     * Creates a new position specification.
     *
     * @param top  the label position info used when an axis is at the top
     *             (<code>null not permitted).
     * @param bottom  the label position info used when an axis is at the
     *                bottom (<code>null not permitted).
     * @param left  the label position info used when an axis is at the left
     *              (<code>null not permitted).
     * @param right  the label position info used when an axis is at the right
     *               (<code>null not permitted).
     */
    public CategoryLabelPositions(CategoryLabelPosition top,
                                  CategoryLabelPosition bottom,
                                  CategoryLabelPosition left,
                                  CategoryLabelPosition right) {

        if (top == null) {
            throw new IllegalArgumentException("Null 'top' argument.");
        }
        if (bottom == null) {
            throw new IllegalArgumentException("Null 'bottom' argument.");
        }
        if (left == null) {
            throw new IllegalArgumentException("Null 'left' argument.");
        }
        if (right == null) {
            throw new IllegalArgumentException("Null 'right' argument.");
        }

        this.positionForAxisAtTop = top;
        this.positionForAxisAtBottom = bottom;
        this.positionForAxisAtLeft = left;
        this.positionForAxisAtRight = right;

    }

    /**
     * Returns the category label position specification for an axis at the
     * given location.
     *
     * @param edge  the axis location.
     *
     * @return The category label position specification.
     */
    public CategoryLabelPosition getLabelPosition(RectangleEdge edge) {
        CategoryLabelPosition result = null;
        if (edge == RectangleEdge.TOP) {
            result = this.positionForAxisAtTop;
        }
        else if (edge == RectangleEdge.BOTTOM) {
            result = this.positionForAxisAtBottom;
        }
        else if (edge == RectangleEdge.LEFT) {
            result = this.positionForAxisAtLeft;
        }
        else if (edge == RectangleEdge.RIGHT) {
            result = this.positionForAxisAtRight;
        }
        return result;
    }

    /**
     * Returns a new instance based on an existing instance but with the top
     * position changed.
     *
     * @param base  the base (<code>null not permitted).
     * @param top  the top position (<code>null not permitted).
     *
     * @return A new instance (never <code>null).
     */
    public static CategoryLabelPositions replaceTopPosition(
            CategoryLabelPositions base, CategoryLabelPosition top) {

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

        return new CategoryLabelPositions(
            top,
            base.getLabelPosition(RectangleEdge.BOTTOM),
            base.getLabelPosition(RectangleEdge.LEFT),
            base.getLabelPosition(RectangleEdge.RIGHT)
        );
    }

    /**
     * Returns a new instance based on an existing instance but with the bottom
     * position changed.
     *
     * @param base  the base (<code>null not permitted).
     * @param bottom  the bottom position (<code>null not permitted).
     *
     * @return A new instance (never <code>null).
     */
    public static CategoryLabelPositions replaceBottomPosition(
            CategoryLabelPositions base, CategoryLabelPosition bottom) {

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

        return new CategoryLabelPositions(
            base.getLabelPosition(RectangleEdge.TOP),
            bottom,
            base.getLabelPosition(RectangleEdge.LEFT),
            base.getLabelPosition(RectangleEdge.RIGHT)
        );
    }

    /**
     * Returns a new instance based on an existing instance but with the left
     * position changed.
     *
     * @param base  the base (<code>null not permitted).
     * @param left  the left position (<code>null not permitted).
     *
     * @return A new instance (never <code>null).
     */
    public static CategoryLabelPositions replaceLeftPosition(
            CategoryLabelPositions base, CategoryLabelPosition left) {

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

        return new CategoryLabelPositions(
            base.getLabelPosition(RectangleEdge.TOP),
            base.getLabelPosition(RectangleEdge.BOTTOM),
            left,
            base.getLabelPosition(RectangleEdge.RIGHT)
        );
    }

    /**
     * Returns a new instance based on an existing instance but with the right
     * position changed.
     *
     * @param base  the base (<code>null not permitted).
     * @param right  the right position (<code>null not permitted).
     *
     * @return A new instance (never <code>null).
     */
    public static CategoryLabelPositions replaceRightPosition(
            CategoryLabelPositions base, CategoryLabelPosition right) {

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

        return new CategoryLabelPositions(
            base.getLabelPosition(RectangleEdge.TOP),
            base.getLabelPosition(RectangleEdge.BOTTOM),
            base.getLabelPosition(RectangleEdge.LEFT),
            right
        );
    }

    /**
     * Returns <code>true if this object is equal to the specified
     * object, and <code>false otherwise.
     *
     * @param obj  the other object.
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {

        if (this == obj) {
            return true;
        }
        if (!(obj instanceof CategoryLabelPositions)) {
            return false;
        }

        CategoryLabelPositions that = (CategoryLabelPositions) obj;
        if (!this.positionForAxisAtTop.equals(that.positionForAxisAtTop)) {
            return false;
        }
        if (!this.positionForAxisAtBottom.equals(
                that.positionForAxisAtBottom)) {
            return false;
        }
        if (!this.positionForAxisAtLeft.equals(that.positionForAxisAtLeft)) {
            return false;
        }
        if (!this.positionForAxisAtRight.equals(that.positionForAxisAtRight)) {
            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.positionForAxisAtTop.hashCode();
        result = 37 * result + this.positionForAxisAtBottom.hashCode();
        result = 37 * result + this.positionForAxisAtLeft.hashCode();
        result = 37 * result + this.positionForAxisAtRight.hashCode();
        return result;
    }
}

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