MIDP1.0游戏完整实现-双人扫雷1.0（二）

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;}