手机上一个坦克游戏

				package demo;
				
				/*
				 * Created on 2004-1-14
				 *
				 */
				
				/**
				 * @author Dabao
				 */
				public class BitArray {
				    private int _width, _height;
				    private byte[] content = null;
				    public int m_nX = 0, m_nY = 0;
				
				
				    /**
				     * 设置数组的宽度和高度
				     * @param width
				     * @param height
				     */
				    public BitArray(int w, int h, int cx, int cy) {
				        this._width = w;
				        this._height = h;
				        this.m_nX = cx;
				        this.m_nY = cy;
				        if (w > 0 && h > 0) {
				            int temp = w * h;
				            if (temp % 7 != 0) {
				                temp = temp / 7 + 1;
				            }
				            else {
				                temp = temp / 7;
				            }
				            content = new byte[temp];
				            for (int i = 0; i < content.length; i++) {
				                content[i] = 0;
				            }
				        }
				    }
				
				    /**
				     * 参数是按照数组的坐标来计算的，都是从0 到width-1
				     * 从0 到height -1
				     * @param col
				     * @param row
				     * @return
				     */
				    public byte get(int x, int y) {
				        int tranlatedX = x - m_nX;
				        int tranlatedY = y - m_nY;
				        if ( (tranlatedX * tranlatedY) >= (_width * _height)) {
				            System.out.println(tranlatedX);
				            System.out.println(tranlatedY);
				            return -1;
				        }
				
				        if (tranlatedX >= 0
				            && tranlatedX < _width
				            && tranlatedY >= 0
				            && tranlatedY < _height) {
				            byte temp = content[getCursor(tranlatedX, tranlatedY)];
				            return (byte)
				                ( (temp >> getOffset(tranlatedX, tranlatedY)) & 1);
				        }
				        return 0;
				    }
				
				    public void set(int x, int y) {
				        int tranlatedX = x - m_nX;
				        int tranlatedY = y - m_nY;
				
				        if (tranlatedX >= 0
				            && tranlatedX < _width
				            && tranlatedY >= 0
				            && tranlatedY < _height) {
				            //int temp = (tranlatedX * _height + tranlatedY + 1) / 7;
				            int temp = getCursor(tranlatedX, tranlatedY);
				            try {
				                content[temp] =
				                    (byte) (content[temp]
				                            | (1 				            }
				            catch (Exception ex) {
				                ex.printStackTrace();
				            }
				
				        }
				
				    }
				
				    public void reSet(int x, int y) {
				        int tranlatedX = x - m_nX;
				        int tranlatedY = y - m_nY;
				        if (tranlatedX >= 0
				            && tranlatedX < _width
				            && tranlatedY >= 0
				            && tranlatedY < _height) {
				            int temp = getCursor(tranlatedX, tranlatedY);
				
				            byte max = Byte.MAX_VALUE;
				            max =
				                (byte) (max
				                        ^ (1 				            content[temp] = (byte) (content[temp] & max);
				        }
				    }
				
				    public int getWidth() {
				        return _width + m_nX;
				    }
				
				    public int getHeight() {
				        return _height + m_nY;
				    }
				
				    private int getCursor(int tx, int ty) {
				        if (tx < 0 || ty < 0 || tx >= _width || ty >= _height) {
				            return -1;
				        }
				        int cur = tx * _height + ty + 1;
				        if (cur % 7 == 0) {
				            return cur / 7 - 1;
				        }
				        else {
				            return cur / 7;
				        }
				    }
				
				    private int getOffset(int tx, int ty) {
				        if (tx < 0 || ty < 0 || tx >= _width || ty >= _height) {
				            return -1;
				        }
				        int cur = tx * _height + ty + 1;
				        if (cur % 7 == 0) {
				            return 6;
				        }
				        else {
				            return cur % 7 - 1;
				        }
				
				    }
				}