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//******************************************************************************
//
// File: TrapPanel.java
// Package: edu.rit.clu.antimatter
// Unit: Class edu.rit.clu.antimatter.TrapPanel
//
// This Java source file is copyright (C) 2008 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ 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 General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.clu.antimatter;
import edu.rit.vector.Vector2D;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;
import javax.swing.JPanel;
/**
* Class TrapPanel is a UI that displays the positions of antiprotons in the
* Antimatter Simulation. It displays the particle positions stored in an array
* of {@linkplain edu.rit.vector.Vector2D} objects.
*
* @author Alan Kaminsky
* @version 04-Feb-2008
*/
public class TrapPanel
extends JPanel
{
// Hidden constants.
private static final int W = 500;
private static final double DIAM = 5;
private static final double RADIUS = DIAM/2;
private static final Color PARTICLE_COLOR = Color.red;
// Hidden data members.
// Array containing particle positions.
private Vector2D[] pArray;
// Scale factor for display.
private double scale;
// For drawing antiprotons.
private Ellipse2D dot = new Ellipse2D.Double();
// State of the display.
private boolean iamWaitingForRepaint = false;
// Exported constructors.
/**
* Construct a new particle panel.
*
* @param pArray Array containing antiprotons' positions.
* @param trapSide Length of each side of the trap.
*/
public TrapPanel
(Vector2D[] pArray,
double trapSide)
{
super();
Dimension theSize = new Dimension (W, W);
setMinimumSize (theSize);
setPreferredSize (theSize);
setMaximumSize (theSize);
this.pArray = pArray;
scale = W / trapSide;
}
// Exported operations.
/**
* Update the display for the next time step.
*/
public synchronized void step()
{
// Repaint the display.
iamWaitingForRepaint = true;
repaint (0L, 0, 0, W, W);
// Wait until repainting is complete.
while (iamWaitingForRepaint)
{
try
{
wait();
}
catch (InterruptedException exc)
{
}
}
}
// Hidden operations.
/**
* Paint this trap panel's display.
*
* @param g Graphics context.
*/
protected synchronized void paintComponent
(Graphics g)
{
// Perform superclass behavior.
super.paintComponent (g);
// Set up graphics context.
Graphics2D g2d = (Graphics2D) g.create();
g2d.setRenderingHint
(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor (PARTICLE_COLOR);
// Draw all antiprotons.
int n = pArray.length;
for (int i = 0; i < n; ++ i)
{
Vector2D p = pArray[i];
dot.setFrame (p.x*scale-RADIUS, p.y*scale-RADIUS, DIAM, DIAM);
g2d.fill (dot);
}
// Notify that repainting is complete.
iamWaitingForRepaint = false;
notifyAll();
}
}
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