A basic panel that displays a small up or down arrow.
/*
* JCommon : a free general purpose class library for the Java(tm) platform
*
*
* (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jcommon/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.]
*
* ---------------
* ArrowPanel.java
* ---------------
* (C) Copyright 2002-2004, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* $Id: ArrowPanel.java,v 1.6 2007/11/02 17:50:36 taqua Exp $
*
* Changes
* -------
* 25-Sep-2002 : Version 1 (DG);
* 13-Oct-2002 : Added Javadocs (DG);
*
*/
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import javax.swing.JPanel;
/**
* A basic panel that displays a small up or down arrow.
*
* @author David Gilbert
*/
public class ArrowPanel extends JPanel {
/** A constant for the up arrow. */
public static final int UP = 0;
/** A constant for the down arrow. */
public static final int DOWN = 1;
/** The arrow type. */
private int type = UP;
/** The available area. */
private Rectangle2D available = new Rectangle2D.Float();
/**
* Creates a new arrow panel.
*
* @param type
* the arrow type.
*/
public ArrowPanel(final int type) {
this.type = type;
setPreferredSize(new Dimension(14, 9));
}
/**
* Paints the arrow panel.
*
* @param g
* the graphics device for drawing on.
*/
public void paintComponent(final Graphics g) {
super.paintComponent(g);
final Graphics2D g2 = (Graphics2D) g;
// first determine the size of the drawing area...
final Dimension size = getSize();
final Insets insets = getInsets();
this.available.setRect(insets.left, insets.top, size.getWidth() - insets.left - insets.right,
size.getHeight() - insets.top - insets.bottom);
g2.translate(insets.left, insets.top);
g2.fill(getArrow(this.type));
}
/**
* Returns a shape for the arrow.
*
* @param t
* the arrow type.
*
* @return the arrow shape.
*/
private Shape getArrow(final int t) {
switch (t) {
case UP:
return getUpArrow();
case DOWN:
return getDownArrow();
default:
return getUpArrow();
}
}
/**
* Returns an up arrow.
*
* @return an up arrow.
*/
private Shape getUpArrow() {
final Polygon result = new Polygon();
result.addPoint(7, 2);
result.addPoint(2, 7);
result.addPoint(12, 7);
return result;
}
/**
* Returns a down arrow.
*
* @return a down arrow.
*/
private Shape getDownArrow() {
final Polygon result = new Polygon();
result.addPoint(7, 7);
result.addPoint(2, 2);
result.addPoint(12, 2);
return result;
}
}
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