gamescreen.java

一个J2ME编译的打地鼠小游戏,供初学者学习

			break;
		case game_Pause:
			if(lx < 0)
			    lx+=2;
			if(rx > screenW/2)
				rx-=2;
			break;
		case game_Over:{
			if(lx < 0)
			    lx+=2;
			if(rx > screenW/2)
				rx-=2;
			if(done/*&&(!wait)*/){  //等待动画播放完毕
				//判断是否进入前三甲，弹出提示菜单，记录或返回主菜单
				try {
					if(gr.isNewRecord(score)==true)
					    addHero();//跳转到登记界面
					
				} catch (RecordStoreNotOpenException e) {
					e.printStackTrace();
				} catch (InvalidRecordIDException e) {
					e.printStackTrace();
				} catch (RecordStoreException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
				GameState = game_Menu;
			}
		}break;
		case game_Quit:{
			//if(!wait){
				running = false;
			    gml.Quit();  //退出游戏
			//}
		}break;
		case game_Setting:
			break;
		case game_Record:
			break;
		case game_About:
			break;
		default:
			System.out.println("ERROR");
		    break;
		}
		
	}
	
	/**
	 *  更新游戏分数
	 */
	void UpdateScore(){
		if(isHit&&(!Add)){  //加分
			if(++got>=3){
				score *= 2;
				got = 0;
				job--;
				sc_x = screenW/2+screenW/6;
				sc_y = screenH/7;
			}else{
			    score += 5;
			    miss = 0;
			}
			//播放声音
			if(sound_on_off==true)
			    p1.playAudio();
			Add = true;
		}else if(!isHit&&(!Minus)){  //减分
			if(++miss>=3){
				score /= 2;
		        miss = 0;
		        sc_x = screenW/2+screenW/6;
		        sc_y = screenH/7;
		    }else{
				score -= 5;
				got = 0;
		    }
			Minus = true;
		}
		if(score<0)
			score = 0;
	}
	
	/*********************************************************************/
	/*                           游戏按键处理                                   */
	/*********************************************************************/
	protected void keyPressed(int keyCode){
		key = keyCode;   //记录键值
		//任意键返回
		//wait = false;
		switch(GameState){
		case game_Menu:{   //主菜单状态
			if(getGameAction(keyCode)==Canvas.UP)
				menu_index--;
			if(getGameAction(keyCode)==Canvas.DOWN)
				menu_index++;
			if(getGameAction(keyCode)==Canvas.FIRE){
				switch(menu_index){
				case 0:
					GameState = game_Start;
					break;
				case 1:
					GameState = game_Setting;
					break;
				case 2:
					GameState = game_Record;
					break;
				case 3:
					GameState = game_About;
					break;
				case 4:
					GameState = game_Quit;
					//wait = true;
					break;
				default:
				    System.out.println("NO SUCH SELECT");		
				}
				//重新初始化资源
			    initPic();
			    initGame();
			}
		}break;
		case game_Start:{  //游戏状态
			if(!hasMove){
				//1~9
			    if(keyCode==Canvas.KEY_NUM1){
			    	hasMove = true;
			    	index = 0;
			    }
			    if(keyCode==Canvas.KEY_NUM2){
			    	hasMove = true;
			    	index = 1;
			    }
			    if(keyCode==Canvas.KEY_NUM3){
			    	hasMove = true;
			    	index = 2;
			    }
			    if(keyCode==Canvas.KEY_NUM4){
			    	hasMove = true;
			    	index = 3;
			    }
			    if(keyCode==Canvas.KEY_NUM5){
			    	hasMove = true;
			    	index = 4;
			    }
			    if(keyCode==Canvas.KEY_NUM6){
			    	hasMove = true;
			    	index = 5;
			    }
			    if(keyCode==Canvas.KEY_NUM7){
			    	hasMove = true;
			    	index = 6;
			    }
			    if(keyCode==Canvas.KEY_NUM8){
			    	hasMove = true;
			    	index = 7;
			    }
			    if(keyCode==Canvas.KEY_NUM9){
			    	hasMove = true;
			    	index = 8;
			    }
			}// end if
			//游戏暂停
			if(keyCode==-7||keyCode==22){  //右软件
			    GameState = game_Pause;
			    lx = -screenW/2;
			    rx = screenW;
			}
		}break;
		case game_Pause:
			//继续游戏
			if(keyCode==-6||keyCode==21||keyCode==Canvas.KEY_NUM1)
				GameState = game_Start;
			//返回菜单
			if(keyCode==-7||keyCode==22||keyCode==Canvas.KEY_NUM3)
				GameState = game_Menu;
			break;
		case game_Over:
			break;
		case game_Setting:{
			if(keyCode==Canvas.KEY_NUM5||getGameAction(keyCode)==Canvas.FIRE)
				sound_on_off = !sound_on_off;
			if(keyCode==-6||keyCode==21||keyCode==Canvas.KEY_NUM1)  //左软件
				GameState = game_Menu;
		}break;
		case game_Record:
			if(keyCode==-6||keyCode==21||keyCode==Canvas.KEY_NUM1)  //左软件
				GameState = game_Menu;
			break;
		case game_About:
			if(getGameAction(keyCode)==Canvas.UP){
				if(start>0)
					start--;
			}
			if(getGameAction(keyCode)==Canvas.DOWN){
				if(start<=94/n-5)
				    start++;
			}
			if(keyCode==-6||keyCode==21||keyCode==Canvas.KEY_NUM1)
				GameState = game_Menu;
			break;
		case game_Quit:
			break;
		}
		//show FPS
		if(keyCode==Canvas.KEY_STAR)
			show = !show;
	}
	
	protected void keyReleased(int keyCode){
		key = -100;   //使键值无效
	}
	
	/*********************************************************************/
	/*                       记录游戏分数到排行榜                                */
	/*********************************************************************/
	private void addHero(){
		if(f_record==null){
			f_record = new Form("记录存储");
			final TextField tf = new TextField("请输入姓名：","AAA",20,0);
			f_record.append(tf);
			f_record.addCommand(new Command("确定",Command.SCREEN,0));
			CommandListener cl = new CommandListener(){   //通过内部类实现监听器
				public void commandAction(Command c, Displayable dis) {
					if(dis==f_record){
						if(c.getLabel().equals("确定"))
							try {
								gr.addRecord(tf.getString(), score);  //添加记录
								Display.getDisplay(gml).setCurrent(gs);
							} catch (RecordStoreNotOpenException e) {
								e.printStackTrace();
							} catch (RecordStoreFullException e) {
								e.printStackTrace();
							} catch (RecordStoreException e) {
								e.printStackTrace();
							} catch (IOException e) {
								e.printStackTrace();
							}
					}
				}
			};
			f_record.setCommandListener(cl); //添加监听器
		}
		//跳转到记录界面	
		Display.getDisplay(gml).setCurrent(f_record);
	}
	
	/*********************************************************************/
	/*                      实现字符绘制和图片缩放                               */
	/*********************************************************************/
	/**
	 *   画字符的工具函数
	 * @param str 字符
	 * @param font 字体
	 * @param color 颜色
	 * @param x x坐标
	 * @param y y坐标
	 * @param g 画笔
	 */
	public void drawSTR(String str,Font font,int color,int x,int y,Graphics g){
		g.setFont(font);  //设置字体
		g.setColor(color);  //设置颜色
		g.setClip(0, 0, getWidth(), getHeight());
		g.drawString(str, x, y, 20);
	}
	
	/**
	 * 横向缩放图片
	 * @param img     目标图片
	 * @param scaleW  缩放后的宽
	 * @return        返回缩放后的图片
	 */
	public static Image HScaleImage(Image img,int scaleW){
		if(img==null){                                  //判断是否为空
			System.out.println("HScaleImage");
			return null;
		}
		if(scaleW<1)                                    //缩放大小不能小于1
			scaleW = 1;
		int imgW = img.getWidth();                      //获取图片的宽
		if(scaleW==imgW)                                //如果缩放的宽度等于原图宽
			return img;                                 //直接返回原图片
		int imgH = img.getHeight();                     //获取图片的高
		Image temp = Image.createImage(scaleW, imgH);   //创建临时图片,大小为改变后的宽高
		Graphics g = temp.getGraphics();                //获取临时图片的画笔
		//绘制新图片
		int pos = imgW/2;
		for(int x=0; x<scaleW; x++){
			int n = x*2+1;
			g.setClip(x, 0, 1, imgH);                   //裁剪出一个宽为1，高度为图像高的区域
			g.drawImage(img, x-(pos*n/scaleW), 0, 20);
			// pos*n/scaleW 是图像偏移量
			//如果两次相差大于1，则略过了某个像素条(缩小),否则重复了某个像素条(放大)
		}
		return temp;
	}
	
	/**
	 * 纵向缩放图片
	 * @param img      目标图片
	 * @param scaleH   缩放后的高
	 * @return         返回缩放后的图片
	 */
	public static Image VScaleImage(Image img,int scaleH){
		if(img==null){
			System.out.println("VScaleImage");
			return null;
		}
		if(scaleH<1)
			scaleH = 1;
		int imgH = img.getHeight();
		if(scaleH==imgH)
			return img;
		int imgW = img.getWidth();
		Image temp = Image.createImage(imgW, scaleH);
		Graphics g = temp.getGraphics();
		int pos = imgH/2;
		for(int y=0; y<scaleH; y++){
			int n = y*2+1;
			g.setClip(0, y, imgW, 1);
			g.drawImage(img, 0, y-(pos*n/scaleH), 20);
		}
		return temp;
	}
	
	/**
	 * 图片缩放
	 * @param img      目标图片
	 * @param scaleW   缩放后的宽
	 * @param scaleH   缩放后的高
	 * @return         返回缩放后的图片
	 */
	public static Image scaleImage(Image img,int scaleW,int scaleH){
		return VScaleImage(HScaleImage(img,scaleW),scaleH);     //先横向缩放，再进行纵向缩放
	}
	
	/*********************************************************************/
	/*                          设置图片透明                                    */
	/*********************************************************************/
    /**
     * 使图片中的特定颜色变为透明色
     * @param img          目标图片
     * @param color_code   选定颜色 (白色 -1,黑色 )
     * @return
     */
	public static final Image alfImage(Image img,int color_code){
  	  if(img == null){
  	      System.out.println("alfImage");
  	      return null;
  	  }
  	  int imgW = img.getWidth();
  	  int imgH = img.getHeight();
  	  int[] RGBData = new int[imgW*imgH];
  	  img.getRGB(RGBData,0,imgW,0,0,imgW,imgH);
  	  for(int i=0;i<RGBData.length;i++){
  	      if(RGBData[i]==color_code)
  		      RGBData[i] &= 0xffffff;
  	  }
  	  Image o_Img = Image.createRGBImage(RGBData,imgW,imgH,true);
  	  return o_Img;
  }
}