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Author: Lucas_F98 (posted 2012-07-03 01:34:50, viewed 182 times)

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package com.myname.standalone;

import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferStrategy;

import javax.swing.JFrame;
import javax.swing.JPanel;


public class Game implements Runnable{
   
   final int WIDTH = 500;                           //VARS
   final int HEIGHT = 500;
   final static String NAME= "GAMEGAMEGAMEGAME";
   JFrame frame;
   static Canvas canvas;
   BufferStrategy bufferStrategy;
   
   static boolean up = false;
   static boolean down = false;
   static boolean left = false;
   static boolean right = false;

   long desiredFPS = 60;
   long desiredDeltaLoop = (1000*1000*1000)/desiredFPS;
   
   long frames = 0;
   long startTime = 0;
    
   boolean running = true;
   
   int x = 0;
   int y = 0;
   
   public Game(){                                    //SETUP FRAME
      frame = new JFrame(NAME);
      JPanel panel = (JPanel) frame.getContentPane();
      panel.setPreferredSize(new Dimension(WIDTH, HEIGHT));
      panel.setLayout(null);
      panel.setFocusable(true);
      canvas = new Canvas();
      canvas.setBounds(0, 0, WIDTH, HEIGHT);
      canvas.setIgnoreRepaint(true);     
      panel.add(canvas, BorderLayout.CENTER);
      
      
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setResizable(false);
      frame.setVisible(true);      
      
      
      canvas.createBufferStrategy(2);
      bufferStrategy = canvas.getBufferStrategy();     
      canvas.requestFocus();
      
     
      
      canvas.addKeyListener(new KeyListener() {               //KEYLISTENER
           public void keyPressed(KeyEvent e) {
            if(e.getKeyCode() == KeyEvent.VK_UP){
               Game.up = true;
            }
            if(e.getKeyCode() == KeyEvent.VK_DOWN){
               Game.down = true;
            }
            if(e.getKeyCode() == KeyEvent.VK_LEFT){
               Game.left = true;
            }
            if(e.getKeyCode() == KeyEvent.VK_RIGHT){
               Game.right = true;
            }
           }

           public void keyReleased(KeyEvent e) {
              if(e.getKeyCode() == KeyEvent.VK_UP){
               Game.up = false;
            }
            if(e.getKeyCode() == KeyEvent.VK_DOWN){
               Game.down = false;
            }
            if(e.getKeyCode() == KeyEvent.VK_LEFT){
               Game.left = false;
            }
            if(e.getKeyCode() == KeyEvent.VK_RIGHT){
               Game.right = false;
            }
              
           }
         public void keyTyped(KeyEvent arg0) {
         }
         });
   
}
   
   public void run(){                        //GAME LOOP
      
      long beginLoopTime;
      long endLoopTime;
      long currentUpdateTime = System.nanoTime();
      long lastUpdateTime;
      long deltaLoop;
      boolean newcount = true;

      while(running){
        
        if(newcount){ 
         startTime = System.nanoTime();
        
         newcount = false;
        }
        
        long currentTime = System.nanoTime();
        
         beginLoopTime = System.nanoTime();
         
         render();
         
         movement();
         
         lastUpdateTime = currentUpdateTime;
         currentUpdateTime = System.nanoTime();
         endLoopTime = System.nanoTime();
         deltaLoop = endLoopTime - beginLoopTime;
         
         frames++;
         
         if((currentTime - startTime) >= 1000000000){
           newcount = true;
           System.out.println("FPS: " + frames);
           frames = 0;
         }
        
           if(deltaLoop > desiredDeltaLoop){
              
           }
           else{
               try{
                   Thread.sleep((desiredDeltaLoop - deltaLoop)/(1000*1000));
               }catch(InterruptedException e){
               }
           }
      }
   }
   
private void movement() {
   if(up) y--;
   if(down)y++;
   if(left)x--;
   if(right)x++;
}

private void render() {                     // UPDATE GRAPHICS NO GLITCHING
      Graphics2D g = (Graphics2D) bufferStrategy.getDrawGraphics();
      g.clearRect(0, 0, WIDTH, HEIGHT);
      render(g);
      g.dispose();
      bufferStrategy.show();
   }

   protected void render(Graphics2D g){       // Paint Method
      g.fillRect(x, y, 100, 100);
   }
   
   public static void main(String [] args){      //StartGame
      Game game = new Game();
      new Thread(game).start();
   }

   }





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