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jfreechart example source code file (GridArrangement.java)

This example jfreechart source code file (GridArrangement.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, block, geometry, graphics2d, graphics2d, gridarrangement, io, lengthconstrainttype, list, rectangleconstraint, rectangleconstraint, runtimeexception, serializable, should, size2d, size2d, util

The jfreechart GridArrangement.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.]
 *
 * --------------------
 * GridArrangement.java
 * --------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 08-Feb-2005 : Version 1 (DG);
 * 03-Dec-2008 : Implemented missing methods, and fixed bugs reported in
 *               patch 2370487 (DG);
 *
 */

package org.jfree.chart.block;

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

import org.jfree.ui.Size2D;

/**
 * Arranges blocks in a grid within their container.
 */
public class GridArrangement implements Arrangement, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -2563758090144655938L;

    /** The rows. */
    private int rows;

    /** The columns. */
    private int columns;

    /**
     * Creates a new grid arrangement.
     *
     * @param rows  the row count.
     * @param columns  the column count.
     */
    public GridArrangement(int rows, int columns) {
        this.rows = rows;
        this.columns = columns;
    }

    /**
     * Adds a block and a key which can be used to determine the position of
     * the block in the arrangement.  This method is called by the container
     * (you don't need to call this method directly) and gives the arrangement
     * an opportunity to record the details if they are required.
     *
     * @param block  the block.
     * @param key  the key (<code>null permitted).
     */
    public void add(Block block, Object key) {
        // can safely ignore
    }

    /**
     * Arranges the blocks within the specified container, subject to the given
     * constraint.
     *
     * @param container  the container (<code>null not permitted).
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     *
     * @return The size following the arrangement.
     */
    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) {
                return arrangeNF(container, g2, constraint);
            }
            else if (h == LengthConstraintType.RANGE) {
                // find optimum height, then map to range
                return arrangeNR(container, g2, constraint);
            }
        }
        else if (w == LengthConstraintType.FIXED) {
            if (h == LengthConstraintType.NONE) {
                // find optimum height
                return arrangeFN(container, g2, constraint);
            }
            else if (h == LengthConstraintType.FIXED) {
                return arrangeFF(container, g2, constraint);
            }
            else if (h == LengthConstraintType.RANGE) {
                // find optimum height and map to range
                return arrangeFR(container, g2, constraint);
            }
        }
        else if (w == LengthConstraintType.RANGE) {
            // find optimum width and map to range
            if (h == LengthConstraintType.NONE) {
                // find optimum height
                return arrangeRN(container, g2, constraint);
            }
            else if (h == LengthConstraintType.FIXED) {
                // fixed width
                return arrangeRF(container, g2, constraint);
            }
            else if (h == LengthConstraintType.RANGE) {
                return arrangeRR(container, g2, constraint);
            }
        }
        throw new RuntimeException("Should never get to here!");
    }

    /**
     * Arranges the container with no constraint on the width or height.
     *
     * @param container  the container (<code>null not permitted).
     * @param g2  the graphics device.
     *
     * @return The size.
     */
    protected Size2D arrangeNN(BlockContainer container, Graphics2D g2) {
        double maxW = 0.0;
        double maxH = 0.0;
        List blocks = container.getBlocks();
        Iterator iterator = blocks.iterator();
        while (iterator.hasNext()) {
            Block b = (Block) iterator.next();
            if (b != null) {
                Size2D s = b.arrange(g2, RectangleConstraint.NONE);
                maxW = Math.max(maxW, s.width);
                maxH = Math.max(maxH, s.height);
            }
        }
        double width = this.columns * maxW;
        double height = this.rows * maxH;
        RectangleConstraint c = new RectangleConstraint(width, height);
        return arrangeFF(container, g2, c);
    }

    /**
     * Arranges the container with a fixed overall width and height.
     *
     * @param container  the container (<code>null not permitted).
     * @param g2  the graphics device.
     * @param constraint  the constraint (<code>null not permitted).
     *
     * @return The size following the arrangement.
     */
    protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {
        double width = constraint.getWidth() / this.columns;
        double height = constraint.getHeight() / this.rows;
        List blocks = container.getBlocks();
        for (int c = 0; c < this.columns; c++) {
            for (int r = 0; r < this.rows; r++) {
                int index = r * this.columns + c;
                if (index >= blocks.size()) {
                    break;
                }
                Block b = (Block) blocks.get(index);
                if (b != null) {
                    b.setBounds(new Rectangle2D.Double(c * width, r * height,
                            width, height));
                }
            }
        }
        return new Size2D(this.columns * width, this.rows * height);
    }

    /**
     * Arrange with a fixed width and a height within a given range.
     *
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     *
     * @return The size of the arrangement.
     */
    protected Size2D arrangeFR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        RectangleConstraint c1 = constraint.toUnconstrainedHeight();
        Size2D size1 = arrange(container, g2, c1);

        if (constraint.getHeightRange().contains(size1.getHeight())) {
            return size1;
        }
        else {
            double h = constraint.getHeightRange().constrain(size1.getHeight());
            RectangleConstraint c2 = constraint.toFixedHeight(h);
            return arrange(container, g2, c2);
        }
    }

    /**
     * Arrange with a fixed height and a width within a given range.
     *
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     *
     * @return The size of the arrangement.
     */
    protected Size2D arrangeRF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        RectangleConstraint c1 = constraint.toUnconstrainedWidth();
        Size2D size1 = arrange(container, g2, c1);

        if (constraint.getWidthRange().contains(size1.getWidth())) {
            return size1;
        }
        else {
            double w = constraint.getWidthRange().constrain(size1.getWidth());
            RectangleConstraint c2 = constraint.toFixedWidth(w);
            return arrange(container, g2, c2);
        }
    }

    /**
     * Arrange with a fixed width and no height constraint.
     *
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     *
     * @return The size of the arrangement.
     */
    protected Size2D arrangeRN(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        RectangleConstraint c1 = constraint.toUnconstrainedWidth();
        Size2D size1 = arrange(container, g2, c1);

        if (constraint.getWidthRange().contains(size1.getWidth())) {
            return size1;
        }
        else {
            double w = constraint.getWidthRange().constrain(size1.getWidth());
            RectangleConstraint c2 = constraint.toFixedWidth(w);
            return arrange(container, g2, c2);
        }
    }

    /**
     * Arrange with a fixed height and no width constraint.
     *
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     *
     * @return The size of the arrangement.
     */
    protected Size2D arrangeNR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        RectangleConstraint c1 = constraint.toUnconstrainedHeight();
        Size2D size1 = arrange(container, g2, c1);

        if (constraint.getHeightRange().contains(size1.getHeight())) {
            return size1;
        }
        else {
            double h = constraint.getHeightRange().constrain(size1.getHeight());
            RectangleConstraint c2 = constraint.toFixedHeight(h);
            return arrange(container, g2, c2);
        }
    }

    /**
     * Arrange with ranges for both the width and height constraints.
     *
     * @param container  the container.
     * @param constraint  the constraint.
     * @param g2  the graphics device.
     *
     * @return The size of the arrangement.
     */
    protected Size2D arrangeRR(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        Size2D size1 = arrange(container, g2, RectangleConstraint.NONE);

        if (constraint.getWidthRange().contains(size1.getWidth())) {
            if (constraint.getHeightRange().contains(size1.getHeight())) {
                return size1;
            }
            else {
                // width is OK, but height must be constrained
                double h = constraint.getHeightRange().constrain(
                        size1.getHeight());
                RectangleConstraint cc = new RectangleConstraint(
                        size1.getWidth(), h);
                return arrangeFF(container, g2, cc);
            }
        }
        else {
            if (constraint.getHeightRange().contains(size1.getHeight())) {
                // height is OK, but width must be constrained
                double w = constraint.getWidthRange().constrain(
                        size1.getWidth());
                RectangleConstraint cc = new RectangleConstraint(w,
                        size1.getHeight());
                return arrangeFF(container, g2, cc);

            }
            else {
                double w = constraint.getWidthRange().constrain(
                        size1.getWidth());
                double h = constraint.getHeightRange().constrain(
                        size1.getHeight());
                RectangleConstraint cc = new RectangleConstraint(w, h);
                return arrangeFF(container, g2, cc);
            }
        }
    }

    /**
     * Arrange with a fixed width and a height within a given range.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size of the arrangement.
     */
    protected Size2D arrangeFN(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        double width = constraint.getWidth() / this.columns;
        RectangleConstraint bc = constraint.toFixedWidth(width);
        List blocks = container.getBlocks();
        double maxH = 0.0;
        for (int r = 0; r < this.rows; r++) {
            for (int c = 0; c < this.columns; c++) {
                int index = r * this.columns + c;
                if (index >= blocks.size()) {
                    break;
                }
                Block b = (Block) blocks.get(index);
                if (b != null) {
                    Size2D s = b.arrange(g2, bc);
                    maxH = Math.max(maxH, s.getHeight());
                }
            }
        }
        RectangleConstraint cc = constraint.toFixedHeight(maxH * this.rows);
        return arrange(container, g2, cc);
    }

    /**
     * Arrange with a fixed height and no constraint for the width.
     *
     * @param container  the container.
     * @param g2  the graphics device.
     * @param constraint  the constraint.
     *
     * @return The size of the arrangement.
     */
    protected Size2D arrangeNF(BlockContainer container, Graphics2D g2,
                               RectangleConstraint constraint) {

        double height = constraint.getHeight() / this.rows;
        RectangleConstraint bc = constraint.toFixedHeight(height);
        List blocks = container.getBlocks();
        double maxW = 0.0;
        for (int r = 0; r < this.rows; r++) {
            for (int c = 0; c < this.columns; c++) {
                int index = r * this.columns + c;
                if (index >= blocks.size()) {
                    break;
                }
                Block b = (Block) blocks.get(index);
                if (b != null) {
                    Size2D s = b.arrange(g2, bc);
                    maxW = Math.max(maxW, s.getWidth());
                }
            }
        }
        RectangleConstraint cc = constraint.toFixedWidth(maxW * this.columns);
        return arrange(container, g2, cc);
    }

    /**
     * Clears any cached layout information retained by the arrangement.
     */
    public void clear() {
        // nothing to clear
    }

    /**
     * Compares this layout manager for equality with an arbitrary object.
     *
     * @param obj  the object.
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof GridArrangement)) {
            return false;
        }
        GridArrangement that = (GridArrangement) obj;
        if (this.columns != that.columns) {
            return false;
        }
        if (this.rows != that.rows) {
            return false;
        }
        return true;
    }

}

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