fps.java

用java开发的一个实施策略游戏源码 值得学习一下

/*
	Netwar
	Copyright (C) 2002  Daniel Grund, Kyle Kakligian, Jason Komutrattananon, & Brian Hibler.

	This file is part of Netwar.

	Netwar 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 2 of the License, or
	(at your option) any later version.

	Netwar 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.

	You should have received a copy of the GNU General Public License
	along with Netwar; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package netwar.utils;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** Temporary class to display the number of frames per second.
 * @author Kyle Kakligian
 */
public class FPS implements ActionListener {
	Timer timer = new Timer(1000, this);

	static int gFrames = 0;
	static int uFrames = 0;
	static int oldgFrames = 0;
	static int olduFrames = 0;

        /** Constructs FPS.
         */        
	public FPS() {
		timer.start();
	}
        /** Draws the frames per sec in the upper left corner
         * @param g Graphics object to draw onto.
         */        
	public static void draw(Graphics g) {
		String s1, s2;
		s1 = "G: " + Integer.toString(oldgFrames);
		s2 = "U: " + Integer.toString(olduFrames);
		g.drawString(s1,30,30);
		g.drawString(s2,30,45);
	}
        /** To be called only from within a graphics update.
         */        
	public static void incG() {
	        gFrames++;
	}
        /** To be called only from within an Updater update.
         */        
	public static void incU() {
		uFrames++;
	}
	public void actionPerformed(ActionEvent e) {
		oldgFrames = gFrames;
		olduFrames = uFrames;
		gFrames = uFrames = 0;
	}
        
        /** returns the last gFrame reading.
         * @return the last gFrame reading.
         */        
        public static int getG() {
            return oldgFrames;            
        }
        
        /** returns the last uFrame reading.
         * @return the last uFrame reading.
         */        
        public static int getU() {
            return olduFrames;
        }
}