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jfreechart example source code file (ColumnArrangement.java)

This example jfreechart source code file (ColumnArrangement.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, columnarrangement, columnarrangement, geometry, graphics2d, graphics2d, io, list, not, rectangleconstraint, rectangleconstraint, runtimeexception, size2d, size2d, todo, util, verticalalignment

The jfreechart ColumnArrangement.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.]
 *
 * ----------------------
 * ColumnArrangement.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);
 * 04-Feb-2005 : Added equals() and implemented Serializable (DG);
 *
 */

package org.jfree.chart.block;

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

import org.jfree.ui.HorizontalAlignment;
import org.jfree.ui.Size2D;
import org.jfree.ui.VerticalAlignment;

/**
 * Arranges blocks in a column layout.  This class is immutable.
 */
public class ColumnArrangement implements Arrangement, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -5315388482898581555L;

    /** The horizontal alignment of blocks. */
    private HorizontalAlignment horizontalAlignment;

    /** The vertical alignment of blocks within each row. */
    private VerticalAlignment verticalAlignment;

    /** The horizontal gap between columns. */
    private double horizontalGap;

    /** The vertical gap between items in a column. */
    private double verticalGap;

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

    /**
     * Creates a new instance.
     *
     * @param hAlign  the horizontal alignment (currently ignored).
     * @param vAlign  the vertical alignment (currently ignored).
     * @param hGap  the horizontal gap.
     * @param vGap  the vertical gap.
     */
    public ColumnArrangement(HorizontalAlignment hAlign,
                             VerticalAlignment vAlign,
                             double hGap, double vGap) {
        this.horizontalAlignment = hAlign;
        this.verticalAlignment = vAlign;
        this.horizontalGap = hGap;
        this.verticalGap = vGap;
    }

    /**
     * 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) {
                throw new RuntimeException("Not implemented.");
            }
            else if (h == LengthConstraintType.FIXED) {
                return arrangeFF(container, g2, constraint);
            }
            else if (h == LengthConstraintType.RANGE) {
                throw new RuntimeException("Not implemented.");
            }
        }
        else if (w == LengthConstraintType.RANGE) {
            if (h == LengthConstraintType.NONE) {
                throw new RuntimeException("Not implemented.");
            }
            else if (h == LengthConstraintType.FIXED) {
                return arrangeRF(container, g2, constraint);
            }
            else if (h == LengthConstraintType.RANGE) {
                return arrangeRR(container, g2, constraint);
            }
        }
        return new Size2D();  // TODO: complete this

    }

    /**
     * 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 container size after the arrangement.
     */
    protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        // TODO: implement properly
        return arrangeNF(container, g2, constraint);
    }

    /**
     * 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 constraint  the size constraint.
     * @param g2  the graphics device.
     *
     * @return The container size after the arrangement.
     */
    protected Size2D arrangeNF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        List blocks = container.getBlocks();

        double height = constraint.getHeight();
        if (height <= 0.0) {
            height = Double.POSITIVE_INFINITY;
        }

        double x = 0.0;
        double y = 0.0;
        double maxWidth = 0.0;
        List itemsInColumn = new ArrayList();
        for (int i = 0; i < blocks.size(); i++) {
            Block block = (Block) blocks.get(i);
            Size2D size = block.arrange(g2, RectangleConstraint.NONE);
            if (y + size.height <= height) {
                itemsInColumn.add(block);
                block.setBounds(
                    new Rectangle2D.Double(x, y, size.width, size.height)
                );
                y = y + size.height + this.verticalGap;
                maxWidth = Math.max(maxWidth, size.width);
            }
            else {
                if (itemsInColumn.isEmpty()) {
                    // place in this column (truncated) anyway
                    block.setBounds(
                        new Rectangle2D.Double(
                            x, y, size.width, Math.min(size.height, height - y)
                        )
                    );
                    y = 0.0;
                    x = x + size.width + this.horizontalGap;
                }
                else {
                    // start new column
                    itemsInColumn.clear();
                    x = x + maxWidth + this.horizontalGap;
                    y = 0.0;
                    maxWidth = size.width;
                    block.setBounds(
                        new Rectangle2D.Double(
                            x, y, size.width, Math.min(size.height, height)
                        )
                    );
                    y = size.height + this.verticalGap;
                    itemsInColumn.add(block);
                }
            }
        }
        return new Size2D(x + maxWidth, constraint.getHeight());
    }

    /**
     * Arranges a container with range constraints for both the horizontal
     * and vertical.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size of the container.
     */
    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.getHeightRange().contains(s1.height)) {
            return s1;  // TODO: we didn't check the width yet
        }
        else {
            RectangleConstraint c = constraint.toFixedHeight(
                constraint.getHeightRange().getUpperBound()
            );
            return arrangeRF(container, g2, c);
        }
    }

    /**
     * Arranges the blocks in the container using a fixed height and a
     * range for the width.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size of the container after 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 blocks without any constraints.  This puts all blocks
     * into a single column.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     *
     * @return The size after the arrangement.
     */
    protected Size2D arrangeNN(BlockContainer container, Graphics2D g2) {
        double y = 0.0;
        double height = 0.0;
        double maxWidth = 0.0;
        List blocks = container.getBlocks();
        int blockCount = blocks.size();
        if (blockCount > 0) {
            Size2D[] sizes = new Size2D[blocks.size()];
            for (int i = 0; i < blocks.size(); i++) {
                Block block = (Block) blocks.get(i);
                sizes[i] = block.arrange(g2, RectangleConstraint.NONE);
                height = height + sizes[i].getHeight();
                maxWidth = Math.max(sizes[i].width, maxWidth);
                block.setBounds(
                    new Rectangle2D.Double(
                        0.0, y, sizes[i].width, sizes[i].height
                    )
                );
                y = y + sizes[i].height + this.verticalGap;
            }
            if (blockCount > 1) {
                height = height + this.verticalGap * (blockCount - 1);
            }
            if (this.horizontalAlignment != HorizontalAlignment.LEFT) {
                for (int i = 0; i < blocks.size(); i++) {
                    //Block b = (Block) blocks.get(i);
                    if (this.horizontalAlignment
                            == HorizontalAlignment.CENTER) {
                        //TODO: shift block right by half
                    }
                    else if (this.horizontalAlignment
                            == HorizontalAlignment.RIGHT) {
                        //TODO: shift block over to right
                    }
                }
            }
        }
        return new Size2D(maxWidth, height);
    }

    /**
     * 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 ColumnArrangement)) {
            return false;
        }
        ColumnArrangement that = (ColumnArrangement) obj;
        if (this.horizontalAlignment != that.horizontalAlignment) {
            return false;
        }
        if (this.verticalAlignment != that.verticalAlignment) {
            return false;
        }
        if (this.horizontalGap != that.horizontalGap) {
            return false;
        }
        if (this.verticalGap != that.verticalGap) {
            return false;
        }
        return true;
    }


}

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