mainmenucanvas.java

用J2ME写的一种五子连线的手机游戏。ColorLinez是一款由玩家通过功能键移动各色小球

package game;

import javax.microedition.lcdui.*;

public class MainMenuCanvas extends Canvas {
	//Display对象
	private Display display;

	//菜单序号
	private int index = 0;

	//屏幕的宽度
	private int width;

	//屏幕的高度
	private int height;

	//游戏菜单
	private Image image[] = new Image[6];

	public MainMenuCanvas(Display display)
	{
		this.display = display;
		//设置全屏
		//this.setFullScreenMode(true);
        //获得屏幕高度与宽度
		width = this.getWidth();
		height = this.getHeight();
	    
		//导入图片
		try
		{
			image[0] = Image.createImage("/res/m_newgame.png");
			image[1] = Image.createImage("/res/m_highscores.png");
			image[2] = Image.createImage("/res/m_options.png");
			image[3] = Image.createImage("/res/m_help.png");
			image[4] = Image.createImage("/res/m_about.png");
			image[5] = Image.createImage("/res/m_quit.png");
		}
		catch(Exception e)
		{}
		index = ColorLinezMIDlet.menuIndex;
	}

	protected void paint(Graphics g)
	{
		//绘制背景
		g.setColor(0x000000);
		g.fillRect(0, 0, width, height);
		g.setColor(0xFFFFFF);

		for (int i = 0; i < image.length; i++)
		{
			g.drawImage(image[i], 60, 15 + i * 25, Graphics.LEFT|Graphics.TOP);
		}

		//绘制选择框
		g.drawRect(59, 14 + index * 25, 62, 21);
	}

	protected void keyPressed(int keyCode) {
		//获得游戏动作
		int action = this.getGameAction(keyCode);

		switch (action)
		{
        //向上
		case Canvas.UP:
			if (index > 0)
            {
				index--;
			}
            else
            {
				index = 5;
			}
			repaint();
			break;
        //向下
		case Canvas.DOWN:
			if (index < 5)
			{
				index++;
			}
			else
			{
				index = 0;
			}
			repaint();
			break;
		//确定
		case Canvas.FIRE:
			ColorLinezMIDlet.menuIndex = index;
			switch (index)
			{
			case 0:
				//显示游戏界面
				display.setCurrent(new LinezCanvas(display));
				break;
			case 1:
				display.setCurrent(new HighScoreCanvas(display));
				break;
			case 2:
				//显示设置界面
				display.setCurrent(new OptionCanvas(display));
				break;
			case 3:
				//显示帮助界面
				display.setCurrent(new HelpCanvas(display));
				break;
			case 4:
				//显示关于界面
				display.setCurrent(new AboutCanvas(display));
				break;
			case 5:
				//退出
				ColorLinezMIDlet.quitApp();
				break;
			}
			//释放图版资源
			for ( int i = 0; i < 6; i++ )
			{
				image[i] = null;
			}
			
			break;
		}
	}
}