gameloop.java

Source-DeathFlight手机游戏,死亡飞行,适合初学者学习.

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import javax.microedition.lcdui.Image;
import java.io.*;

public class GameLoop extends GameCanvas implements Runnable {
	
	private boolean mTrucking;

	private long mFrameDelay;

	private int screenWidth,screenHeight,mX, mY;
	
	private Image img;
	
	private Terrain terrain;
	
	private Helicopter player;
	
	private Flight midlet;
	
	private Command pauseCommand;
	
	private Command resumeCommand;
	
	private Command exitCommand;
	
	public GameLoop(Flight midlet) {
		
		super(true);
		
		this.midlet = midlet;
		
		screenWidth = getWidth();
		screenHeight = getHeight();
		mX = screenWidth  / 2;
		mY = screenHeight * 2 / 3;
		mFrameDelay = 15;

		player = new Helicopter();
		
		try{                         // I was so frustrated at the moment when i got to know
			img = Image.createImage("/res/brick.png"); //i have no idea to avoid the ugly inintialize codes
		}catch(IOException ioe){            // out of the constructor of the class Terrain
			ioe.printStackTrace();
		}
		terrain = new Terrain(screenWidth/4  , screenHeight/12 + 2,img,4,12,player);
		
		pauseCommand = new Command("PAUSE",Command.STOP,1);
		resumeCommand = new Command("RESUME",Command.SCREEN,1);
		exitCommand = new Command("EXIT",Command.EXIT,1);
		
	}

	public void start() {
		mTrucking = true;
		Thread t = new Thread(this);
		t.start();
	}

	public void stop() {
		mTrucking = false;
	}

	public void run() {
		
		Graphics g = getGraphics();

		while (mTrucking == true) {
			input();
			render(g);
			if(terrain.collides() == true && player.dying == false)player.dying = true;
			if(player.alive == false){stop();midlet.addHighScore(getScore());}
			try {
				Thread.sleep(mFrameDelay);
			} catch (InterruptedException ie) {
			}
		}
	}


	private void input() {
		int keyStates = getKeyStates();
		if ((keyStates & FIRE_PRESSED) != 0 )
			mX = Math.max(0, mX - 1);
		else mX = Math.min(getWidth()-10, mX + 1);
	}

	private void render(Graphics g) {
		g.setColor(0x000000);
		g.fillRect(0,0,screenWidth,screenHeight);
		
		terrain.paint(g);
		terrain.update();           // update the terrain seemly,i think that's the best way
		
		player.moveto(mX,mY);
		player.paint(g);
		player.update();
		
		g.setColor(0xff0000);
		g.drawString(String.valueOf(terrain.milemeter),20,20,0);
		
		flushGraphics();
	}
	
	public int getScore(){
		return terrain.milemeter;
	}
	
}