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;
				
				    /*public static void main(String[] args) {
				        BitArray ba = new BitArray(10, 2);
				        int row = 9;
				        int col = 1;
				
				        ba.set(row, col);
				        ba.set(2, 1);
				        byte a = ba.get(row, col);
				        System.out.println(a);
				        ba.reSet(row, col);
				        a = ba.get(row, col);
				        System.out.println(a);
				        a = ba.get(2, 1);
				        System.out.println(a);
				    }/**/
				
				    /**
				     * 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;
				        System.out.println("w:" + w + " h:" + h + " cx:" + cx + " cy:" + cy);
				        if (w > 0 && h > 0) {
				            int temp = w * h;
				            //System.out.println("temp  = " + temp);
				            if (temp % 8 != 0) {
				                temp = temp / 8 + 1;
				            }
				            else {
				                temp = temp / 8;
				            }
				            //System.out.println(temp);
				            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 (x >= 0 && x < _width && y >= 0 && y < _height) {
				            byte temp = content[ (x * _height + y + 1) / 8];
				            //System.out.println("temp:" + temp);
				            return (byte) ( (temp >> (8 - (x * _height + y + 1) % 8)) & 1);
				        }
				        return 0;
				    }
				
				    public void set(int x, int y) {
				        int tranlatedX = x - m_nX;
				        int tranlatedY = y - m_nY;
				        if (x >= 0 && x < _width && y >= 0 && y < _height) {
				            int temp = (x * _height + y + 1) / 8;
				
				            content[temp] =
				                (byte) (content[temp]
				                        | (1 				        }
				    }
				
				    public void reSet(int x, int y) {
				        int tranlatedX = x - m_nX;
				        int tranlatedY = y - m_nY;
				        if (x >= 0 && x < _width && y >= 0 && y < _height) {
				            int temp = (x * _height + y + 1) / 8;
				
				            //System.out.println("temp:" + temp);
				            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;
				    }
				
				}