/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2012, 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ---------------
* EmptyBlock.java
* ---------------
* (C) Copyright 2004-2012, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes:
* --------
* 22-Oct-2004 : Version 1 (DG);
* 04-Feb-2005 : Now cloneable and serializable (DG);
* 20-Apr-2005 : Added new draw() method (DG);
* 08-Apr-2008 : Added support for margin and border (DG);
* 08-May-2008 : Updated arrange() method to recognise incoming constraint (DG);
* 17-Jun-2012 : Removed JCommon dependencies (DG);
*
*/
package org.jfree.chart.block;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import org.jfree.chart.ui.Size2D;
import org.jfree.chart.util.PublicCloneable;
/**
* An empty block with a fixed size.
*/
public class EmptyBlock extends AbstractBlock
implements Block, Cloneable, PublicCloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -4083197869412648579L;
/**
* Creates a new block with the specified width and height.
*
* @param width the width.
* @param height the height.
*/
public EmptyBlock(double width, double height) {
setWidth(width);
setHeight(height);
}
/**
* Arranges the contents of the block, within the given constraints, and
* returns the block size.
*
* @param g2 the graphics device.
* @param constraint the constraint (<code>null</code> not permitted).
*
* @return The block size (in Java2D units, never <code>null</code>).
*/
@Override
public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
Size2D base = new Size2D(calculateTotalWidth(getWidth()),
calculateTotalHeight(getHeight()));
return constraint.calculateConstrainedSize(base);
}
/**
* Draws the block. Since the block is empty, there is nothing to draw
* except the optional border.
*
* @param g2 the graphics device.
* @param area the area.
*/
@Override
public void draw(Graphics2D g2, Rectangle2D area) {
draw(g2, area, null);
}
/**
* Draws the block within the specified area. Since the block is empty,
* there is nothing to draw except the optional border.
*
* @param g2 the graphics device.
* @param area the area.
* @param params ignored (<code>null</code> permitted).
*
* @return Always <code>null</code>.
*/
@Override
public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
area = trimMargin(area);
drawBorder(g2, area);
return null;
}
/**
* Returns a clone of the block.
*
* @return A clone.
*
* @throws CloneNotSupportedException if there is a problem cloning.
*/
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}