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jfreechart example source code file (RectangleConstraint.java)

This example jfreechart source code file (RectangleConstraint.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

illegalargumentexception, lengthconstrainttype, lengthconstrainttype, none, null, null, range, range, rectangleconstraint, rectangleconstraint, size2d, string

The jfreechart RectangleConstraint.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.]
 *
 * ------------------------
 * RectangleConstraint.java
 * ------------------------
 * (C) Copyright 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 22-Oct-2004 : Version 1 (DG);
 * 02-Feb-2005 : Added toString() method (DG);
 * 08-Feb-2005 : Separated height and width constraints (DG);
 * 13-May-2005 : Added convenience constructor and new methods for
 *               transforming constraints (DG);
 *
 */

package org.jfree.chart.block;

import org.jfree.data.Range;
import org.jfree.ui.Size2D;

/**
 * A description of a constraint for resizing a rectangle.  Constraints are
 * immutable.
 */
public class RectangleConstraint {

    /**
     * An instance representing no constraint.
     */
    public static final RectangleConstraint NONE = new RectangleConstraint(
            0.0, null, LengthConstraintType.NONE,
            0.0, null, LengthConstraintType.NONE);

    /** The width. */
    private double width;

    /** The width range. */
    private Range widthRange;

    /** The width constraint type. */
    private LengthConstraintType widthConstraintType;

    /** The fixed or maximum height. */
    private double height;

    private Range heightRange;

    /** The constraint type. */
    private LengthConstraintType heightConstraintType;

    /**
     * Creates a new "fixed width and height" instance.
     *
     * @param w  the fixed width.
     * @param h  the fixed height.
     */
    public RectangleConstraint(double w, double h) {
        this(w, null, LengthConstraintType.FIXED,
                h, null, LengthConstraintType.FIXED);
    }

    /**
     * Creates a new "range width and height" instance.
     *
     * @param w  the width range.
     * @param h  the height range.
     */
    public RectangleConstraint(Range w, Range h) {
        this(0.0, w, LengthConstraintType.RANGE,
                0.0, h, LengthConstraintType.RANGE);
    }

    /**
     * Creates a new constraint with a range for the width and a
     * fixed height.
     *
     * @param w  the width range.
     * @param h  the fixed height.
     */
    public RectangleConstraint(Range w, double h) {
        this(0.0, w, LengthConstraintType.RANGE,
                h, null, LengthConstraintType.FIXED);
    }

    /**
     * Creates a new constraint with a fixed width and a range for
     * the height.
     *
     * @param w  the fixed width.
     * @param h  the height range.
     */
    public RectangleConstraint(double w, Range h) {
        this(w, null, LengthConstraintType.FIXED,
                0.0, h, LengthConstraintType.RANGE);
    }

    /**
     * Creates a new constraint.
     *
     * @param w  the fixed or maximum width.
     * @param widthRange  the width range.
     * @param widthConstraintType  the width type.
     * @param h  the fixed or maximum height.
     * @param heightRange  the height range.
     * @param heightConstraintType  the height type.
     */
    public RectangleConstraint(double w, Range widthRange,
                               LengthConstraintType widthConstraintType,
                               double h, Range heightRange,
                               LengthConstraintType heightConstraintType) {
        if (widthConstraintType == null) {
            throw new IllegalArgumentException("Null 'widthType' argument.");
        }
        if (heightConstraintType == null) {
            throw new IllegalArgumentException("Null 'heightType' argument.");
        }
        this.width = w;
        this.widthRange = widthRange;
        this.widthConstraintType = widthConstraintType;
        this.height = h;
        this.heightRange = heightRange;
        this.heightConstraintType = heightConstraintType;
    }

    /**
     * Returns the fixed width.
     *
     * @return The width.
     */
    public double getWidth() {
        return this.width;
    }

    /**
     * Returns the width range.
     *
     * @return The range (possibly <code>null).
     */
    public Range getWidthRange() {
        return this.widthRange;
    }

    /**
     * Returns the constraint type.
     *
     * @return The constraint type (never <code>null).
     */
    public LengthConstraintType getWidthConstraintType() {
        return this.widthConstraintType;
    }

    /**
     * Returns the fixed height.
     *
     * @return The height.
     */
    public double getHeight() {
        return this.height;
    }

    /**
     * Returns the width range.
     *
     * @return The range (possibly <code>null).
     */
    public Range getHeightRange() {
        return this.heightRange;
    }

    /**
     * Returns the constraint type.
     *
     * @return The constraint type (never <code>null).
     */
    public LengthConstraintType getHeightConstraintType() {
        return this.heightConstraintType;
    }

    /**
     * Returns a constraint that matches this one on the height attributes,
     * but has no width constraint.
     *
     * @return A new constraint.
     */
    public RectangleConstraint toUnconstrainedWidth() {
        if (this.widthConstraintType == LengthConstraintType.NONE) {
            return this;
        }
        else {
            return new RectangleConstraint(this.width, this.widthRange,
                    LengthConstraintType.NONE, this.height, this.heightRange,
                    this.heightConstraintType);
        }
    }

    /**
     * Returns a constraint that matches this one on the width attributes,
     * but has no height constraint.
     *
     * @return A new constraint.
     */
    public RectangleConstraint toUnconstrainedHeight() {
        if (this.heightConstraintType == LengthConstraintType.NONE) {
            return this;
        }
        else {
            return new RectangleConstraint(this.width, this.widthRange,
                    this.widthConstraintType, 0.0, this.heightRange,
                    LengthConstraintType.NONE);
        }
    }

    /**
     * Returns a constraint that matches this one on the height attributes,
     * but has a fixed width constraint.
     *
     * @param width  the fixed width.
     *
     * @return A new constraint.
     */
    public RectangleConstraint toFixedWidth(double width) {
        return new RectangleConstraint(width, this.widthRange,
                LengthConstraintType.FIXED, this.height, this.heightRange,
                this.heightConstraintType);
    }

    /**
     * Returns a constraint that matches this one on the width attributes,
     * but has a fixed height constraint.
     *
     * @param height  the fixed height.
     *
     * @return A new constraint.
     */
    public RectangleConstraint toFixedHeight(double height) {
        return new RectangleConstraint(this.width, this.widthRange,
                this.widthConstraintType, height, this.heightRange,
                LengthConstraintType.FIXED);
    }

    /**
     * Returns a constraint that matches this one on the height attributes,
     * but has a range width constraint.
     *
     * @param range  the width range (<code>null not permitted).
     *
     * @return A new constraint.
     */
    public RectangleConstraint toRangeWidth(Range range) {
        if (range == null) {
            throw new IllegalArgumentException("Null 'range' argument.");
        }
        return new RectangleConstraint(range.getUpperBound(), range,
                LengthConstraintType.RANGE, this.height, this.heightRange,
                this.heightConstraintType);
    }

    /**
     * Returns a constraint that matches this one on the width attributes,
     * but has a range height constraint.
     *
     * @param range  the height range (<code>null not permitted).
     *
     * @return A new constraint.
     */
    public RectangleConstraint toRangeHeight(Range range) {
        if (range == null) {
            throw new IllegalArgumentException("Null 'range' argument.");
        }
        return new RectangleConstraint(this.width, this.widthRange,
                this.widthConstraintType, range.getUpperBound(), range,
                LengthConstraintType.RANGE);
    }

    /**
     * Returns a string representation of this instance, mostly used for
     * debugging purposes.
     *
     * @return A string.
     */
    public String toString() {
        return "RectangleConstraint["
                + this.widthConstraintType.toString() + ": width="
                + this.width + ", height=" + this.height + "]";
    }

    /**
     * Returns the new size that reflects the constraints defined by this
     * instance.
     *
     * @param base  the base size.
     *
     * @return The constrained size.
     */
    public Size2D calculateConstrainedSize(Size2D base) {
        Size2D result = new Size2D();
        if (this.widthConstraintType == LengthConstraintType.NONE) {
            result.width = base.width;
            if (this.heightConstraintType == LengthConstraintType.NONE) {
               result.height = base.height;
            }
            else if (this.heightConstraintType == LengthConstraintType.RANGE) {
               result.height = this.heightRange.constrain(base.height);
            }
            else if (this.heightConstraintType == LengthConstraintType.FIXED) {
               result.height = this.height;
            }
        }
        else if (this.widthConstraintType == LengthConstraintType.RANGE) {
            result.width = this.widthRange.constrain(base.width);
            if (this.heightConstraintType == LengthConstraintType.NONE) {
                result.height = base.height;
            }
            else if (this.heightConstraintType == LengthConstraintType.RANGE) {
                result.height = this.heightRange.constrain(base.height);
            }
            else if (this.heightConstraintType == LengthConstraintType.FIXED) {
                result.height = this.height;
            }
        }
        else if (this.widthConstraintType == LengthConstraintType.FIXED) {
            result.width = this.width;
            if (this.heightConstraintType == LengthConstraintType.NONE) {
                result.height = base.height;
            }
            else if (this.heightConstraintType == LengthConstraintType.RANGE) {
                result.height = this.heightRange.constrain(base.height);
            }
            else if (this.heightConstraintType == LengthConstraintType.FIXED) {
                result.height = this.height;
            }
        }
        return result;
    }

}

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