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jfreechart example source code file (CenterArrangement.java)

This example jfreechart source code file (CenterArrangement.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

awt, block, centerarrangement, geometry, graphics2d, graphics2d, io, lengthconstrainttype, list, not, not, rectangleconstraint, rectangleconstraint, runtimeexception, serializable, size2d, size2d, util

The jfreechart CenterArrangement.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.]
 *
 * ----------------------
 * CenterArrangement.java
 * ----------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 08-Mar-2005 : Version 1 (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 20-Jul-2006 : Set bounds of contained block when arranging (DG);
 *
 */

package org.jfree.chart.block;

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

import org.jfree.ui.Size2D;

/**
 * Arranges a block in the center of its container.  This class is immutable.
 */
public class CenterArrangement implements Arrangement, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -353308149220382047L;

    /**
     * Creates a new instance.
     */
    public CenterArrangement() {
    }

    /**
     * Adds a block to be managed by this instance.  This method is usually
     * called by the {@link BlockContainer}, you shouldn't need to call it
     * directly.
     *
     * @param block  the block.
     * @param key  a key that controls the position of the block.
     */
    public void add(Block block, Object key) {
        // since the flow layout is relatively straightforward,
        // no information needs to be recorded here
    }

    /**
     * Calculates and sets the bounds of all the items in the specified
     * container, subject to the given constraint.  The <code>Graphics2D
     * can be used by some items (particularly items containing text) to
     * calculate sizing parameters.
     *
     * @param container  the container whose items are being arranged.
     * @param g2  the graphics device.
     * @param constraint  the size constraint.
     *
     * @return The size of the container after arrangement of the contents.
     */
    public Size2D arrange(BlockContainer container, Graphics2D g2,
                          RectangleConstraint constraint) {

        LengthConstraintType w = constraint.getWidthConstraintType();
        LengthConstraintType h = constraint.getHeightConstraintType();
        if (w == LengthConstraintType.NONE) {
            if (h == LengthConstraintType.NONE) {
                return arrangeNN(container, g2);
            }
            else if (h == LengthConstraintType.FIXED) {
                throw new RuntimeException("Not implemented.");
            }
            else if (h == LengthConstraintType.RANGE) {
                throw new RuntimeException("Not implemented.");
            }
        }
        else if (w == LengthConstraintType.FIXED) {
            if (h == LengthConstraintType.NONE) {
                return arrangeFN(container, g2, constraint);
            }
            else if (h == LengthConstraintType.FIXED) {
                throw new RuntimeException("Not implemented.");
            }
            else if (h == LengthConstraintType.RANGE) {
                throw new RuntimeException("Not implemented.");
            }
        }
        else if (w == LengthConstraintType.RANGE) {
            if (h == LengthConstraintType.NONE) {
                return arrangeRN(container, g2, constraint);
            }
            else if (h == LengthConstraintType.FIXED) {
                return arrangeRF(container, g2, constraint);
            }
            else if (h == LengthConstraintType.RANGE) {
                return arrangeRR(container, g2, constraint);
            }
        }
        throw new IllegalArgumentException("Unknown LengthConstraintType.");

    }

    /**
     * Arranges the blocks in the container with a fixed width and no height
     * constraint.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size.
     */
    protected Size2D arrangeFN(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        List blocks = container.getBlocks();
        Block b = (Block) blocks.get(0);
        Size2D s = b.arrange(g2, RectangleConstraint.NONE);
        double width = constraint.getWidth();
        Rectangle2D bounds = new Rectangle2D.Double((width - s.width) / 2.0,
                0.0, s.width, s.height);
        b.setBounds(bounds);
        return new Size2D((width - s.width) / 2.0, s.height);
    }

    /**
     * Arranges the blocks in the container with a fixed with and a range
     * constraint on the height.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size following the arrangement.
     */
    protected Size2D arrangeFR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        Size2D s = arrangeFN(container, g2, constraint);
        if (constraint.getHeightRange().contains(s.height)) {
            return s;
        }
        else {
            RectangleConstraint c = constraint.toFixedHeight(
                    constraint.getHeightRange().constrain(s.getHeight()));
            return arrangeFF(container, g2, c);
        }
    }

    /**
     * Arranges the blocks in the container with the overall height and width
     * specified as fixed constraints.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size following the arrangement.
     */
    protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        // TODO: implement this properly
        return arrangeFN(container, g2, constraint);
    }

    /**
     * Arranges the blocks with the overall width and height to fit within
     * specified ranges.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size after the arrangement.
     */
    protected Size2D arrangeRR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        // first arrange without constraints, and see if this fits within
        // the required ranges...
        Size2D s1 = arrangeNN(container, g2);
        if (constraint.getWidthRange().contains(s1.width)) {
            return s1;  // TODO: we didn't check the height yet
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                    constraint.getWidthRange().getUpperBound());
            return arrangeFR(container, g2, c);
        }
    }

    /**
     * Arranges the blocks in the container with a range constraint on the
     * width and a fixed height.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size following the arrangement.
     */
    protected Size2D arrangeRF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        Size2D s = arrangeNF(container, g2, constraint);
        if (constraint.getWidthRange().contains(s.width)) {
            return s;
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                    constraint.getWidthRange().constrain(s.getWidth()));
            return arrangeFF(container, g2, c);
        }
    }

    /**
     * Arranges the block with a range constraint on the width, and no
     * constraint on the height.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size following the arrangement.
     */
    protected Size2D arrangeRN(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        // first arrange without constraints, then see if the width fits
        // within the required range...if not, call arrangeFN() at max width
        Size2D s1 = arrangeNN(container, g2);
        if (constraint.getWidthRange().contains(s1.width)) {
            return s1;
        }
        else {
            RectangleConstraint c = constraint.toFixedWidth(
                    constraint.getWidthRange().getUpperBound());
            return arrangeFN(container, g2, c);
        }
    }

    /**
     * Arranges the blocks without any constraints.  This puts all blocks
     * into a single row.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     *
     * @return The size after the arrangement.
     */
    protected Size2D arrangeNN(BlockContainer container, Graphics2D g2) {
        List blocks = container.getBlocks();
        Block b = (Block) blocks.get(0);
        Size2D s = b.arrange(g2, RectangleConstraint.NONE);
        b.setBounds(new Rectangle2D.Double(0.0, 0.0, s.width, s.height));
        return new Size2D(s.width, s.height);
    }

    /**
     * Arranges the blocks with no width constraint and a fixed height
     * constraint.  This puts all blocks into a single row.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size after the arrangement.
     */
    protected Size2D arrangeNF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        // TODO: for now we are ignoring the height constraint
        return arrangeNN(container, g2);
    }

    /**
     * Clears any cached information.
     */
    public void clear() {
        // no action required.
    }

    /**
     * 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 CenterArrangement)) {
            return false;
        }
        return true;
    }

}

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