menuscreen.java

基于J2ME的手机游戏---览桥风光的开发

import javax.microedition.lcdui.*;
public class MenuScreen extends Canvas  implements Runnable,CommandListener
{
 Font lowfont=Font.getFont(Font.FACE_MONOSPACE,Font.STYLE_PLAIN,Font.SIZE_MEDIUM);
	  Font highfont=Font.getFont(Font.FACE_MONOSPACE,Font.STYLE_BOLD,Font.SIZE_MEDIUM);
	 int lowColor=0x000000FF;
	 int highColor=0x00FF0000;
	 int highBGColor=0x00CCCCCC;
	 int width;
	 boolean co;
	 int height;
	 int startHeight;
	 int spacing=highfont.getHeight()/2;
	public  static String[] mainmenu={"新游戏","帮助","关于"};
	 int menuIndex;
	Thread menuThread;
	private Command ok=new Command("ok",Command.OK,1);
	private lzhhdm midlet;
	public MenuScreen(lzhhdm midlet)
	{	this.midlet=midlet;
		width=getWidth();
		height=getHeight();
	
		startHeight=(highfont.getHeight()*mainmenu.length)+((mainmenu.length-1)*spacing);
		startHeight=(height-startHeight)/2;
		menuIndex=0;
		addCommand(ok);
		 setCommandListener(this);	
		menuThread =new Thread(this);
		menuThread.start();
		co=true;
	}
	
	public void run()
	{
		while(co)
		{ 
			repaint();
		}
	}
	
	public void paint(Graphics g)
	{  
		g.setColor(0x00FFFFFF);
		g.fillRect(0,0,width,height);
		for(int i=0;i<mainmenu.length;i++)
		{
			if(i==menuIndex)
			{  
				g.setColor(highBGColor);
				g.fillRect(0,startHeight+(i*highfont.getHeight())+spacing,width,highfont.getHeight());
				g.setFont(highfont);
				g.setColor(highColor);
				g.drawString(mainmenu[i],(width-highfont.stringWidth(mainmenu[i]))/2,startHeight+(i*highfont.getHeight())+spacing,20);
			}else
			{
				g.setFont(lowfont);
				g.setColor(lowColor);
				g.drawString(mainmenu[i],(width-lowfont.stringWidth(mainmenu[i]))/2,startHeight+(i*highfont.getHeight())+spacing,20);
			}
		}
	}
	public void keyPressed(int code)
	{
		if(getGameAction(code)==Canvas.UP&&menuIndex-1>=0)
		{
			menuIndex--;
		}
		else if(getGameAction(code)==Canvas.DOWN&&menuIndex+1<mainmenu.length)
		{
			menuIndex++;
		}
	}
	public void commandAction(Command c,Displayable d)
	{
		if (c==ok)
		{
			switch(menuIndex)
			{
			  case 0:
			  	 co=false;
			  	midlet.gameShow();
			 
			  	break;
			  case 1:
			  	midlet.helShow();
			  	break;
			  case 2:
			  	midlet.renwuShow();
			  	break;
			
			}	
		}
	}
}