mainmenucanvas.java

用J2ME开发的卡片游戏

/**
 * 
 * 主选择菜单界面
 * 
 * 
 */

package card;

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.Image;

import card.stringtable.ImageStringTable;

import java.io.IOException;

public class MainMenuCanvas extends Canvas{
	  private Image imgMainMenu = null;
	  private Display display = null;
	  private Image imgMenuChoice = null;
	  
	  protected final int MENU_NEWGAME = 0;
	  protected final int MENU_HIGHSCORE = 1;
	  protected final int MENU_SETTINGS = 2;
	  protected final int MENU_HELP = 3;
	  protected final int MENU_ABOUT = 4;
	  protected final int MENU_EXITGAME = 5;
	  
	  protected int iMenuX, iMenuY, iMenuWidth, iMenuHeight;
	  
	  protected int iGameStatus; 
	  protected int iMenuChoice;
	  
	  FigureChoiceCanvas cvsFigureChoice = null;
	  HighScoreForm frmHighScore = null;
	  SettingsForm frmSettings = null;
	  HelpList frmHelp = null;
	  AboutForm frmAbout = null;
	  
	  protected int iSoundSeleted;
	
	public MainMenuCanvas(Display display) {
		this.setFullScreenMode(true);
		this.display = display;
		
	    iMenuX = 35;
	    iMenuY = 82;
	    iMenuWidth = 120;
	    iMenuHeight = 19;
		
	    iMenuChoice = MENU_NEWGAME;	    
	}
	 
	public void init() {
		try {
			imgMainMenu = Image.createImage(ImageStringTable.getImgMainMenuString()) ;
			imgMenuChoice = Image.createImage(ImageStringTable.getImgMenuSelectedString());
			
		} catch (IOException e) { //图片载入错误处理
			ErrorHandling ehIOException = new ErrorHandling(display, ErrorHandling.IMGNOTFOUND);
		}
	}
	
	 protected synchronized void keyPressed(int keyCode) {
	    int iKey = getGameAction(keyCode);	    
	    
	     	switch (iKey) {
	     		case Canvas.UP: 
	     			if (iMenuChoice > MENU_NEWGAME) {
	     				iMenuChoice--;
	     			}
	     			break;
	     		case Canvas.DOWN: 
	     			if (iMenuChoice < MENU_EXITGAME) {
	     				iMenuChoice++;
	     			}
	     			break;
	     		case Canvas.FIRE:
	     			if (iMenuChoice == MENU_NEWGAME) { //选择进入新游戏
	     				if (cvsFigureChoice == null) {
	     					cvsFigureChoice = new FigureChoiceCanvas(display);
	     				}
	     				display.setCurrent(cvsFigureChoice);	
	     				cvsFigureChoice.init();
	     			} else if (iMenuChoice == MENU_HIGHSCORE) { //选择进入高分榜
	     				if (frmHighScore == null) {
	     					frmHighScore = new HighScoreForm(display);
	     				}
	     				display.setCurrent(frmHighScore);
	     				frmHighScore.init();
	     			} else if (iMenuChoice == MENU_SETTINGS) { //选择进入设置界面
	     				if (frmSettings == null) {
	     					frmSettings = new SettingsForm(display, this);
	     				}
	     				display.setCurrent(frmSettings);    			
	     			} else if (iMenuChoice == MENU_HELP) { //选择进入帮助界面
	     				if (frmHelp == null) {
	     					frmHelp = new HelpList(display, this);
	     				}
	     				display.setCurrent(frmHelp);
	     				     			
	     			} else if (iMenuChoice == MENU_ABOUT) { //选择进入关于界面
	     				if (frmAbout == null) {
	     					frmAbout = new AboutForm(display, this);
	     				}
	     				display.setCurrent(frmAbout);
	     			} else if (iMenuChoice == MENU_EXITGAME){ //选择退出游戏
	     			   	CardMainMIDlet.quitApp();
	     			}			
	     	}
	 	 repaint();
	 }
	
	public void paint(Graphics g) {	      
    	g.drawImage(imgMainMenu, 0, 0, Graphics.TOP | Graphics.LEFT);
    	g.setClip(iMenuX,iMenuY + iMenuChoice * 19, iMenuWidth, iMenuHeight);
    	g.drawImage(imgMenuChoice, 0, 0, Graphics.TOP | Graphics.LEFT);
	}
	
}