/* ===========================================================
* 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.]
*
* ---------------
* EmptyBlock.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 : 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);
*
*/
package com.positive.charts.block;
import java.io.Serializable;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.GCData;
import org.eclipse.swt.graphics.Rectangle;
import com.positive.charts.data.util.PublicCloneable;
import com.positive.charts.util.Size2D;
/**
* 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(final double width, final double height) {
this.setWidth(width);
this.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>).
*/
public Size2D arrange(final GC g2, final RectangleConstraint constraint) {
final Size2D base = new Size2D(this
.calculateTotalWidth(this.getWidth()), this
.calculateTotalHeight(this.getHeight()));
return constraint.calculateConstrainedSize(base);
}
/**
* Returns a clone of the block.
*
* @return A clone.
*
* @throws CloneNotSupportedException
* if there is a problem cloning.
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* 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.
*/
public void draw(final GC g2, final Rectangle area) {
this.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>.
*/
public Object draw(final GC g2, Rectangle area, final Object params) {
area = this.trimMargin(area);
this.drawBorder(g2, area);
return null;
}
public void internal_dispose_GC(final int handle, final GCData data) {
}
public int internal_new_GC(final GCData data) {
return 0;
}
}