MIDP1.0游戏完整实现-双人扫雷1.0（二）

　　作者：yinowl
2005年2月

帮助界面
帮助界面很简单，把需要的文字排好宽度放在一个String数组里，然后绘制在屏幕上，假如一屏放不下就增加按键响应来翻屏，其实只是重新画出数组前面或后面的几个值，源代码如下：

在MiningCanvas.Java中添加如下代码
final String[] strGamehelp =new String[10];
public MiningCanvas(MiningMIDlet miningMIDlet){
    ...
    strGamehelp[0]="此游戏为双人对战游戏";
    strGamehelp[1]=",和经典的扫雷不同,这";
    strGamehelp[2]="个游戏中，我们要挖出";
    strGamehelp[3]="雷,挖错雷则交换玩家.";
    strGamehelp[4]="一共有52颗雷,256个格";
    strGamehelp[5]="子，最先挖到27颗雷者";
    strGamehelp[6]="获胜.1.上,下,左,右分";
    strGamehelp[7]="别为数字键2,8,4,6,挖";
    strGamehelp[8]="雷为5;2.屏幕外框的颜";
    strGamehelp[9]="色为当前下玩家;";
}
private void paintHelpScreen(Graphics g){
    g.setColor(0x00FFFFFF);
    g.fillRect(0,0,canvasW,canvasH);
    g.setFont(lowFont);
    g.setColor(0x00000000);
    for(int i=0;i<strGamehelp.length;i++){
        g.drawString(strGamehelp[i],5,5+(lowFont.getHeight()+3)*i,Graphics.TOPGraphics.LEFT);
    }
}
在keyPressed方法中的switch结构中添加
case GAMESTATE_HELP://假如游戏现在的状态为帮助状态，那个不管玩家按哪个键都会跳转到主菜单状态
    gamestate=GAMESTATE_MENU;
    break;

游戏主界面
主界面的绘制分成几个部分，一个是雷区棋盘的绘制，根据雷区二位数组中的每一个Bomb对象中的变量值绘出整个棋盘，假如hasFound值为false，画出；假如hasFound值为true且isBomb值为false，那么会画出这个雷位四周的雷数、、、、、、；假如hasFound值为true且isBomb值为true，那么会画出这个雷位是哪一个玩家所挖出的，分别是和。第二个部分是玩家的选择框。第三个部分是游戏的信息框，也就是两个玩家目前的分值，还剩几颗雷，信息框的图片为。最后一个部分是提示当前轮到哪一个玩家扫雷，在雷区的外框用玩家的颜色提示，和在信息框中画出玩家的旗帜和。
这里有几个注重点：
1.雷区不能全部在屏幕中画下，所以会通过卷轴滚动。整个雷区是16x16，我们的屏幕预备画出10x12，用两个变量（paintX和paintY）来控制当前要画出的雷区左上角的雷位坐标，例如这两个变量的值分别为3和4，那么会画出横轴3-10，纵轴4-13的雷位，选择框的坐标（selectedX和selectedY）不用担心，当他超出了屏幕，只需要增加或减少paintX和paintY的值即可，只要保证选择框的坐标和paintX/Y坐标值得距离不超过9（10-1）和11（12-1）即可。这里要十分小心的是，我们这里所有的坐标值和雷区的二位数组bombs中的坐标正好相反，也就是选择框（5，6）是类位bombs[6][5]。
2.在创建雷区二维Bomb数组时，二位数组的大小是18x18（new Bomb[miningMapGrid+2][miningMapGrid+2]），目的是在大小16x16的真正雷区外加一圈雷位，以避免bombOut()方法和其他需要周边搜索雷位时不会出现超越边界异常。
3.因为bombs数组中的索引1-16才是真正代表雷区中坐标（1，1）至（16，16）的雷位，所以在整个程序中，所有有关坐标和数组索引值的地方都要十分小心，不要出现位置错误
4.消息框中需要绘制的几个数值的坐标变量（Player1X/Y，Player2X/Y，bombnowX/Y）的值都是相对于整个消息框的左上角的相对坐标，我们也可以为消息框的坐标单独定义一对变量，这样就更清楚了。
源代码如下：

在MiningCanvas.java中添加如下代码
int empty;
static final int miningMapGrid=16;//雷区为16格x16格
static final int bombNum=52;//共有52颗雷
int miningMapLength,miningGridLength;//整个雷区的边长，每一个雷位格子的边长
int miningMapX,miningMapY;//雷区的左上角坐标
int selectedX,selectedY;//选择框的坐标，是在雷区里的坐标（1-16）
int player1Found,player2Found;//两个玩家的分值，即已经找到的雷数
int paintX,paintY;//要画出的区域的左上角坐标，是在雷区里的坐标（1-16）
int bombLeft;//剩下未扫出的雷数
static final int Player1X=10,Player1Y=30;//信息框中画出玩家一分数的坐标位置，相对于信息框左上角
static final int Player2X=10,Player2Y=90;//信息框中画出玩家二分数的坐标位置，相对于信息框左上角
static final int bombnowX=8,bombnowY=52;//信息框中画出剩余雷数的坐标位置，相对于信息框左上角
static final int bombMapW=10,bombMapH=12;//屏幕上能绘出的雷位的数量
Bomb[][] bombs;
boolean isPlayer1;//当前是否轮到玩家一扫雷
Alert winAlert;//显示输赢信息的Alert对象
String winString;//比出输赢后要输出的信息
boolean sbWon;//是否得出输赢
static final Font font  = Font.getFont(Font.FACE_MONOSPACE,Font.STYLE_PLAIN,Font.SIZE_SMALL);
    //消息框中使用的字体
Image infoImg,splashImage;
Image unFoundGroundImg;
Image foundGroundImg;
Image player1BombImg,player2BombImg,player1TurnImg,player2TurnImg;
Image bomb1Img,bomb2Img,bomb3Img,bomb4Img,bomb5Img,bomb6Img,bomb7Img,bomb8Img; 
    //所有要用到的图片
public MiningCanvas(MiningMIDlet miningMIDlet){
    ...
    try{//实例化游戏中需要的Image对象
        unFoundGroundImg=Image.createImage("/unfoundGroundbig.png");
        foundGroundImg=Image.createImage("/foundGroundbig.png");
        player1BombImg=Image.createImage("/player1bombbig.png");
        player2BombImg=Image.createImage("/player2bombbig.png");
        bomb1Img=Image.createImage("/bomb1big.png");
        bomb2Img=Image.createImage("/bomb2big.png");
        bomb3Img=Image.createImage("/bomb3big.png");
        bomb4Img=Image.createImage("/bomb4big.png");
        bomb5Img=Image.createImage("/bomb5big.png");
        bomb6Img=Image.createImage("/bomb6big.png");
        infoImg=Image.createImage("/info.png");
        splashImage=Image.createImage("/occo.png");
        player1TurnImg=Image.createImage("/player1turn.png");
        player2TurnImg=Image.createImage("/player2turn.png");
    }catch(IOException e){}
    isPlayer1=true;//初始化玩家先后顺序
    miningGridLength=14;//初始化每一个雷位的边长
    miningMapLength=14*12;//整个扫雷棋盘的边长
    miningMapX=(canvasW-miningMapLength)/2;//屏幕上棋盘左上角的X坐标
    miningMapY=(canvasH-miningMapLength)/2;//屏幕上棋盘左上角的Y坐标
    selectedX=selectedY=miningMapGrid/2;//初始化选择框的坐标为
    player1Found=player2Found=0;//初始化两个玩家的得分
    paintX=paintY=3;//初始化整个雷区一开始在屏幕上显示的范围
    sbWon=false;//初始化没有玩家获胜
    bombLeft=bombNum;//初始化剩余雷数为总雷数
    bombs=new Bomb[miningMapGrid+2][miningMapGrid+2];
    bombInit();//初始化雷区 
}
private void paintGameScreen(Graphics g){
    paintPlayer(g,isPlayer1);
    paintMiningMap(g);
    paintInfo(g);
    paintSelected(g);
}
protected void paintInfo(Graphics g){
    g.drawImage(infoImg,miningMapX+bombMapW*miningGridLength+1,
                miningMapY,Graphics.TOPGraphics.LEFT);
    g.setFont(font);
    g.setColor(0x00FFFFFF);
    g.drawString(String.valueOf(bombLeft),miningMapX+bombMapW*miningGridLength+bombnowX,
                miningMapY+bombnowY,Graphics.TOPGraphics.LEFT);
    g.drawString(String.valueOf(player1Found),miningMapX+bombMapW*miningGridLength+Player1X,
                miningMapY+Player1Y,Graphics.TOPGraphics.LEFT);
    g.drawString(String.valueOf(player2Found),miningMapX+bombMapW*miningGridLength+Player2X,
                miningMapY+Player2Y,Graphics.TOPGraphics.LEFT);
    //这个方法中接下来的代码是用来在信息框中画出小地图，也就是屏幕上显示的地雷区域在整个雷区
      中的位置
    g.setColor(0x00777777);
    g.fillRect(miningMapX+bombMapW*miningGridLength+1,miningMapY+8*miningGridLength+1,
                2*miningGridLength-2,2*miningGridLength-1);
    g.setColor(0x00000000);
    g.drawRect(miningMapX+bombMapW*miningGridLength+1,miningMapY+8*miningGridLength+1,
                2*miningGridLength-2,2*miningGridLength-1);
    g.setColor(0x00BBBBBB);
    g.fillRect(miningMapX+bombMapW*miningGridLength+4+2*(paintX-1),
                miningMapY+8*miningGridLength+4+2*(paintY-1),12,17);
    g.setColor(0x00FFFFFF);
    g.drawRect(miningMapX+bombMapW*miningGridLength+4+2*(paintX-1),
                miningMapY+8*miningGridLength+4+2*(paintY-1),12,17);
}
protected void paintPlayer(Graphics g,boolean isPlayer1){
    if(isPlayer1)//在棋盘外围画出玩家颜色的外框
        g.setColor(0x000000FF);
    else
        g.setColor(0x00FF0000);
    for(int i=1;i<=5;i++){
        g.drawRect(miningMapX-i,miningMapY-i,miningMapLength+2*i,miningMapLength+2*i);
    }
    if(isPlayer1)//在信息框中画出代表玩家的旗帜
        g.drawImage(player1TurnImg,miningMapX+(bombMapW+1)*miningGridLength+1,
                miningMapY+11*miningGridLength,Graphics.HCENTERGraphics.VCENTER);
    else
        g.drawImage(player2TurnImg,miningMapX+(bombMapW+1)*miningGridLength+1,
                miningMapY+11*miningGridLength,Graphics.HCENTERGraphics.VCENTER);
}
public void paintMiningMap(Graphics g){
    for(int i=0;i<bombMapH;i++){
        for(int j=0;j<bombMapW;j++){//根据每个Bomb对象中的变量值画出不同的图片
            if(!bombs[i+paintY+1][j+paintX+1].hasFound){
                g.drawImage(unFoundGroundImg,miningMapX+j*miningGridLength,
                        miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
            }
            else {
                if(!bombs[i+paintY+1][j+paintX+1].isBomb){
                    switch(bombs[i+paintY+1][j+paintX+1].bombaround){
                        case 0:
                            g.drawImage(foundGroundImg,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                            break;
                        case 1:
                            g.drawImage(bomb1Img,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                            break;
                        case 2:
                            g.drawImage(bomb2Img,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                            break;
                        case 3:
                            g.drawImage(bomb3Img,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                            break;
                        case 4:
                            g.drawImage(bomb4Img,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                            break;
                        case 5:
                            g.drawImage(bomb5Img,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                            break;
                        case 6:
                            g.drawImage(bomb6Img,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                            break;
                        default:
                            g.drawImage(foundGroundImg,miningMapX+j*miningGridLength,
                                miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                        break;
                    }
                }
                else {
                    if(bombs[i+paintY+1][j+paintX+1].isPlayer1){
                        g.drawImage(player1BombImg,miningMapX+j*miningGridLength,
                            miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                    }
                    else{
                        g.drawImage(player2BombImg,miningMapX+j*miningGridLength,
                            miningMapY+i*miningGridLength,Graphics.TOPGraphics.LEFT);
                    }
                }
            }
        }
    }
}
public void paintSelected(Graphics g){
    g.setColor(0x00FF0000);//画出选择框，注重其与总雷区和能在屏幕上显示出的区域间的关系
    g.drawRoundRect(miningMapX+(selectedX-paintX)*miningGridLength-1,
                miningMapY+(selectedY-paintY)*miningGridLength-1,
                miningGridLength+1,miningGridLength+1,2,2);
}
在keyPressed方法中的switch结构中添加
case GAMESTATE_GAMEING:
{
    if(keyCode==FullCanvas.KEY_SOFTKEY1){
        gamestate=GAMESTATE_GAMEMENU;
    }
    else if (action == FullCanvas.LEFT ) {
        selectedX=(--selectedX+miningMapGrid)%(miningMapGrid);
    }
    else if (action == FullCanvas.RIGHT) {
        selectedX=(++selectedX)%(miningMapGrid);
    }
    else if (action == FullCanvas.UP) {
        selectedY=(--selectedY+miningMapGrid)%(miningMapGrid);
    }
    else if (action == FullCanvas.DOWN) {
        selectedY=(++selectedY)%(miningMapGrid);
    }
    else if (action == FullCanvas.FIRE) {
        if(!bombs[selectedY+1][selectedX+1].hasFound){
            if(bombs[selectedY+1][selectedX+1].isBomb){
                bombs[selectedY+1][selectedX+1].hasFound=true;
                bombs[selectedY+1][selectedX+1].isPlayer1=this.isPlayer1;
                if(isPlayer1)
                    player1Found++;
                else
                    player2Found++;
                bombLeft--;
                checkWin();//每次有玩家挖到了雷就监测其是否胜出
            }
            else{
                bombOut(selectedY+1,selectedX+1);
                //假如此雷位及四周都无雷，打开所有与其相连的相同情况的雷位及此区域周边一圈雷位
                isPlayer1=!isPlayer1;
            }
        }
    }
    //以下几行代码是调整显示在屏幕上的区域的坐标，以免选择框跑出屏幕范围
    if((selectedX-paintX)<0)
        paintX=selectedX;
    else if((selectedX-paintX)>=bombMapW)
        paintX=selectedX-bombMapW+1;
    if((selectedY-paintY)<0)
        paintY=selectedY;
    else if((selectedY-paintY)>=bombMapH)
        paintY=selectedY-bombMapH+1;
    break;
}