maincanvas.java

是一本开发J2ME程序的50个例题的源代码

package demo;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.game.GameCanvas;

public class MainCanvas extends GameCanvas implements Runnable{
	public static final int GAME_UI		= 0;	//进入用户界面
	public static final int GAME_GAMING	= 1;	//进行游戏
	public static final int GAME_END		= 2;	//游戏结束
	public static final int GAME_STATE_NUM = 3;	//状态总数
	private int m_nState	= GAME_UI;			//存储当前的游戏状态
	
	private boolean	m_bRunning;			//控制线程运行
	private MyUI m_UI;						//用户界面对象
	private Pictures m_Pictrues;			//相似图像对象
	private int m_nX;						//当前位置的横坐标
	private int m_nY;						//当前位置的纵坐标
	private int m_nTime = 1000;				//游戏时间
	public MainCanvas(){
		super(true);
		m_UI = new MyUI();
		m_Pictrues = new Pictures(getWidth(), getHeight());
		m_nX = getWidth()/2;
		m_nY = getHeight()/2;
		setState( GAME_UI );
		Start();								//启动线程
	}
	private void setState( int state ){		//设置当前的游戏状态
		if( state < 0 || state >= GAME_STATE_NUM )
			return;
		m_nState = state;
	}
	public void Start(){
		m_bRunning = true;
		Thread thread = new Thread(this);		//分配新线程
		thread.start();							//线程启动
	}
	public void run() {						//新线程自动调用此方法
		//获取系统当前时间，并将时间换算成以毫秒为单位的数
		long T1 = System.currentTimeMillis();
		long T2 = T1;
		while(m_bRunning){
			T2 = System.currentTimeMillis();
			if( T2 - T1 > 100 ){			    //间隔100毫秒
				T1 = T2;
				Input();
				Logic();
				Paint();
			}
		}
	}
	public void Stop(){						//终止游戏
		m_bRunning = false;
	}
	public void Input(){
		int keyStates = getKeyStates();
		switch( m_nState ){
		case GAME_UI:							//进入用户界面
			m_UI.Input( keyStates );
			if( m_UI.getState() == MyUI.UI_HIDE )
				setState(GAME_GAMING);
			break;			
		case GAME_GAMING:						//进入游戏
			if( ( keyStates & GameCanvas.FIRE_PRESSED ) != 0 ){
				m_Pictrues.CheckDiffer(m_nX, m_nY);
				if( m_Pictrues.getFindNum() == m_Pictrues.getDiffNum() )
					setState(GAME_END);
			}
			else if( ( keyStates & GameCanvas.UP_PRESSED ) != 0 )
				m_nY -= 3;
			else if( ( keyStates & GameCanvas.RIGHT_PRESSED ) != 0 )
				m_nX += 3;
			else if( ( keyStates & GameCanvas.DOWN_PRESSED ) != 0 )
				m_nY += 3;
			else if( ( keyStates & GameCanvas.LEFT_PRESSED ) != 0 )
				m_nX -= 3;
			break;
		case GAME_END:							//游戏结束
			break;
		}
	}
	public void Logic(){
		switch( m_nState ){
		case GAME_UI:
			break;			
		case GAME_GAMING:
			m_nTime --;
			if( m_nTime < 0 )
				setState( GAME_END );
			break;
		case GAME_END:
			break;
		}
	}
	public void Paint(){
		Graphics g = getGraphics();
		//用黑色清屏
		g.setColor(0);
		g.fillRect(0, 0, getWidth(), getHeight());
		
		g.setColor(0xFFFF0000);
		switch( m_nState ){
		case GAME_UI:				//显示界面
			m_UI.Paint(g, getWidth(), getHeight());
			break;			
		case GAME_GAMING:			//显示游戏画面
			m_Pictrues.Paint(g);
			//显示当前点的区域
			g.setColor(0xFF0000FF);
			g.fillRect(m_nX - 2, m_nY - 2, 4, 4);
			break;
		case GAME_END:				//游戏结束
			if( m_Pictrues.getFindNum() == m_Pictrues.getDiffNum() ){
				g.drawString("全找对了", getWidth()/2-20,
						getHeight()/2, 0);
			}
			else{
				g.drawString("继续努力", getWidth()/2-20,
						getHeight()/2, 0);
			}
			break;
		}
		flushGraphics();
	}
}