wzqchessboard.java

j2me源代码

package wzq;

import java.util.Vector;

import javax.microedition.lcdui.*;
import java.io.IOException;

/**
 * <p>Title:五子棋棋盘 </p>
 *
 * <p>Description:在这里实现了五子棋棋盘的绘制工作 </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: Star Group</p>
 *
 * @author: wangyaobsz
 * @version 1.0
 */
public class WzqChessBoard extends Canvas implements CommandListener {

    int nWhiteWidth; //空白区域的宽度
    int nCanvasW, nCanvasH; //画布的宽度和高度
    int nChessWidth; //棋子的宽度
    int nChessMapLength, nMapGrid, nGridWidth; //棋盘的宽度，网格的数目、宽度
    int nMapX, nMapY; //棋盘的原点坐标
    int nSelectX, nSelectY; //选择框的坐标
    Chesses chess;  //棋盘上的棋子信息
    boolean bNewGame; //是否开始新游戏
    private Graphics gx;  //绘图设备的属性

    private final int GAME_RUN = 1;
    private final int GAME_PAUSE = 2;
    private final int GAME_OVER = 3;

    private int nState;   //游戏状态

    Command cmdStart, cmdPause, cmdExit, cmdRestart;

    public WzqChessBoard() {
        try {
            jbInit();
        } catch (Exception e) {
            e.printStackTrace();
        }
        cmdStart = new Command("开始游戏",Command.OK,1);
        cmdPause = new Command("暂停",Command.OK,1);
        cmdExit = new Command("退出游戏", Command.EXIT, 0);
        cmdRestart = new Command("重新开始游戏", Command.SCREEN, 0);
        addCommand(cmdRestart);
        addCommand(cmdExit);
        addCommand(cmdPause);

        //开始初始化变量
        bNewGame = true;
        nWhiteWidth = 10; //预留的空白位置的宽度
        nCanvasW = getWidth() - nWhiteWidth;
        nCanvasH = getHeight() - nWhiteWidth;
        nMapGrid = Chesses.BOARD_SIZE;
        chess = new Chesses();
        nState = GAME_RUN;
        //根据屏幕的大小，自动调整棋盘的大小
        if (nCanvasW > nCanvasH) {
            nChessMapLength = nCanvasH - nCanvasH % nMapGrid;
            nMapX = (nCanvasW - nChessMapLength) / 2 + nWhiteWidth / 2;
            nMapY = (nCanvasH % nMapGrid) / 2 + nWhiteWidth / 2;
        } else {
            nChessMapLength = nCanvasW - nCanvasW % nMapGrid;
            nMapX = (nCanvasW % nMapGrid) / 2 + nWhiteWidth / 2;
            nMapY = (nCanvasH - nChessMapLength) / 2 + nWhiteWidth / 2;
        }
        nGridWidth = nChessMapLength / nMapGrid;
        nChessWidth = nGridWidth - 1;
        nSelectX = nSelectY = nMapGrid / 2;
    }

    /**
     * 绘制棋盘上的网格<p>
     * @param g
     */
    protected void paintMap(Graphics g) {
        g.setColor(128, 128, 128);
        for (int i = 0; i < nMapGrid; i++) {
            for (int j = 0; j < nMapGrid; j++) {
                g.drawRect(nMapX + j * nGridWidth,
                           nMapY + i * nGridWidth,
                           nGridWidth,
                           nGridWidth);
            }
        }
    }

    /**
     * 在当前位置上绘制一个提示框<p>
     * @param g
     */
    protected void paintSelectBox(Graphics g) {
        g.setColor(255, 0, 255);
        g.drawRect(nMapX + nSelectX * nGridWidth - nGridWidth / 2,
                   nMapY + nSelectY * nGridWidth - nGridWidth / 2,
                   nGridWidth,
                   nGridWidth);
    }

    /**
     * 绘制棋子<p>
     * @param g
     */
    protected void paintChesses(Graphics g) {
        for (int i = 0; i <= nMapGrid; i++) {
            for (int j = 0; j <= nMapGrid; j++) {
                if (chess.getChess()[i][j] != Chesses.NO_CHESS) {
                    if (chess.getChess()[i][j] == Chesses.WHITE_CHESS) {
                        g.setColor(255, 255, 255);
                    } else {
                        g.setColor(0, 0, 0);
                    }
                    g.fillArc(nMapX + j * nGridWidth - nChessWidth / 2,
                              nMapY + i * nGridWidth - nChessWidth / 2,
                              nChessWidth, nChessWidth, 0, 360);
                }
            }
        }
    }

    /**
     * 初始化
     */
    private void jbInit() throws Exception {
        setCommandListener(this);

        if (bNewGame) {
            chess = new Chesses();
            nSelectX = nSelectY = nMapGrid / 2;
        }
    }

    /**
     * 响应命令消息<p>
     * @param command
     * @param displayable
     */
    public void commandAction(Command command, Displayable displayable) {
        if (command == cmdExit) {
            WzqMIDlet.quitApp();
        } else if (command == cmdRestart) {
            try {
                jbInit();
            } catch (Exception e) {
                e.printStackTrace();
            }
            repaint();
        }else if (command == cmdPause){
            nState = GAME_PAUSE;
            this.removeCommand(cmdPause);
            this.removeCommand(cmdRestart);
            this.addCommand(cmdStart);
            repaint();
        }else if (command == cmdStart){
            nState = GAME_RUN;
            this.removeCommand(cmdStart);
            this.addCommand(cmdRestart);
            this.addCommand(cmdPause);
            repaint();
        }
    }

    /**
     * 响应键盘消息<p>
     * @param keyCode
     */
    protected synchronized void keyPressed(int keyCode) {
        if (nState == GAME_RUN) { //如果游戏已经结束，则不再响应键盘消息
            int action = getGameAction(keyCode);
            switch(action){
                case Canvas.LEFT://向左
                    nSelectX = (--nSelectX + nMapGrid + 1) % (nMapGrid + 1);
                    break;
                case Canvas.RIGHT://向右
                    nSelectX = (++nSelectX) % (nMapGrid + 1);
                    break;
                case Canvas.UP://向上
                    nSelectY = (--nSelectY + nMapGrid + 1) % (nMapGrid + 1);
                    break;
                case Canvas.DOWN://向下
                    nSelectY = (++nSelectY) % (nMapGrid + 1);
                    break;
                case Canvas.FIRE://选择确认
                    boolean flag = chess.putChess(nSelectY, nSelectX); //放置棋子
                    if (!chess.isGameOver() && flag) { //判断上一步放置是否成功且游戏是否结束
                        this.AIputChess(); //机器下棋

                        if (chess.isGameOver()) {
                            nState = GAME_OVER;
                            this.removeCommand(cmdStart);
                            this.removeCommand(cmdPause);
                            repaint();
                        }
                    break;
                }
            }
            repaint();
          }
       }
    /**
     * 绘制消息<p>
     * @param msg
     */
    protected void drawMessage(Vector msg) {
        int rowW = 0;
        int w = 0;
        for (int i = 0; i < msg.size(); i++) {
            w = gx.getFont().stringWidth("" + msg.elementAt(i));
            if (w > rowW) {
                rowW = w;
            }
        }

        int rowH = gx.getFont().getHeight();

        int gap = 5;
        int boxX = (getWidth() - rowW - gap * 2) / 2;
        int boxH = rowH * msg.size() + gap * 2;
        int boxY = (getHeight() - boxH) / 2;
        int boxW = rowW + gap * 2;

        gx.setColor(128, 128, 128);
        drawMask(boxX, boxY, boxW, boxH, true);

        gx.setColor(0, 255, 0);
        gx.drawRect(boxX, boxY, boxW, boxH);
        gx.setColor(255, 0, 0);
        for (int i = 0; i < msg.size(); i++) {
            int msgW = gx.getFont().stringWidth("" + msg.elementAt(i));
            gx.drawString("" + msg.elementAt(i), boxX + gap,
                          boxY + gap + i * rowH, 0);
        }
    }

    /**
     * 绘制消息的底纹<p>
     * @param mx
     * @param my
     * @param mw
     * @param mh
     * @param dark
     */
    private void drawMask(int mx, int my, int mw, int mh, boolean dark) {
        for (int i = 0; i < mh; i += 2) {
            gx.drawLine(mx, my + i, mx + mw, my + i);
        }
        if (dark) {
            for (int i = 0; i < mw; i += 2) {
                gx.drawLine(mx + i, my, mx + i, my + mh);
            }
        }
    }

    /**
     * 机器下棋<p>
     */
    protected void AIputChess() {
        Point ptBest = AI.findBestLocation(this.chess);
        this.chess.putChess(ptBest.getX(), ptBest.getY());
    }

    /**
     * 绘制所有的屏幕内容<p>
     * @param g
     */
    protected void paint(Graphics g) {
        switch(nState){
        case GAME_RUN:
        case GAME_OVER:
            gx = g;
            g.setColor(0, 0, 191);
            g.fillRect(0, 0, getWidth(), getHeight());
            paintMap(g);
            paintSelectBox(g);
            paintChesses(g);
            if (this.chess.getMessages().size() > 0) {
                drawMessage(this.chess.getMessages());
            }
            break;
        case GAME_PAUSE:
            g.setColor(0,0,0);
            g.fillRect(0,0,getWidth(),getHeight());
            Image img = null;
            try {
                img = Image.createImage("/res/pause.png");
            } catch (IOException e) {
                e.printStackTrace();
            }
            g.drawImage(img, getWidth() / 2, getHeight() / 2,
                               Graphics.HCENTER | Graphics.VCENTER);
            String str = new String("暂停中...");
            g.setColor(255,0,0);
            g.setFont(Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD,
                                      Font.SIZE_LARGE));
            g.drawString(str,getWidth()/2,getHeight()-20,
                         Graphics.HCENTER|Graphics.BASELINE);
            break;
        }
    }

}