Android游戏开发之摄像头的原理以及更新源码

package cn.m15.xys; import java.io.InputStream; import java.util.Random; import android.app.Activity; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Bundle; import android.view.Display; import android.view.View; import android.view.Window; import android.view.WindowManager; public class CameraAcitvity extends Activity { MapView mMapView = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 全屏显示窗口 requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); // 获取屏幕宽高 Display display = getWindowManager().getDefaultDisplay(); // 显示自定义的游戏View mMapView = new MapView(this,display.getWidth(), display.getHeight()); setContentView(mMapView); } public class MapView extends View { // tile块的宽高 public final static int TILE_WIDTH = 32; public final static int TILE_HEIGHT = 32; // tile块的宽高的数量 public final static int TILE_WIDTH_COUNT = 20; public final static int TILE_HEIGHT_COUNT = 20; // 地图的宽高的 public final static int MAP_WIDTH = 640; public final static int MAP_HEIGHT = 640; //镜头移动范围 public final static int CAMERA_MOVE = 10; // 屏幕的宽高 public int mScreenWidth = 0; public int mScreenHeight = 0; // 数组元素为0则什么都不画 public final static int TILE_NULL = 0; // 第一层游戏View地图数组 public int[][] mMapView = { { 1, 1, 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1 }, { 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 1, 1, 1 }, { 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 1, 1, 1 }, { 137, 137, 137, 1, 1, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 1, 1, 1, 1 }, { 1, 137, 137, 1, 1, 1, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 1, 137, 1 }, { 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 1 }, { 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 1, 1, 1, 137, 137, 137, 137, 137, 137 }, { 1, 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 1, 1, 1, 137, 137, 137, 137, 1 }, { 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 137, 137, 1, 1, 1, 1, 137, 137, 137 }, { 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1, 137, 137 }, { 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 137, 137, 137 }, { 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 137, 137, 137 }, { 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 1, 137, 137, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, { 1, 1, 1, 1, 1, 1, 1, 137, 137, 137, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 } }; // 第二层游戏实体actor数组 public int[][] mMapAcotor = { { 143, 144, 0, 102, 104, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 185, 186, 187, 188 }, { 151, 152, 0, 110, 112, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 193, 194, 195, 196 }, { 159, 160, 0, 110, 112, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 201, 202, 203, 204 }, { 0, 0, 0, 126, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 209, 210, 211, 212 }, { 0, 0, 0, 134, 136, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 218, 219, 220 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 227, 228 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 102, 103, 103, 103, 104, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 110, 111, 111, 111, 112, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 110, 111, 111, 111, 112, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 126, 127, 127, 127, 128, 0, 0, 0, 0, 0, 0, 0, 165, 166, 0, 0, 0, 0, 0, 0 }, { 123, 124, 124, 124, 125, 0, 0, 0, 0, 0, 0, 0, 173, 174, 175, 176, 0, 0, 0, 0 }, { 229, 230, 231, 232, 0, 0, 0, 0, 0, 0, 0, 0, 181, 182, 183, 184, 0, 0, 0, 0 }, { 237, 238, 239, 240, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 245, 246, 247, 248, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 0, 254, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 233, 234, 235, 236, 0, 0, 0 }, { 0, 262, 263, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 241, 242, 243, 244, 0, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 250, 251, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 258, 259, 0, 0, 143, 144 } }; // 第三层游戏碰撞物理层数组 // 下一章介绍 // .................... // 游戏地图资源 Bitmap mBitmap = null; // 资源文件 Resources mResources = null; // 游戏画笔 Paint mPaint = null; // 横向纵向tile块的数量 int mWidthTileCount = 0; int mHeightTileCount = 0; // 横向纵向tile块的数量 int mBitMapWidth = 0; int mBitMapHeight = 0; //摄像头的焦点 0.0点为焦点在中心。 int mCameraPosX = 0; int mCameraPosY = 0; //地图左上角锚点坐标 int mMapPosX =0; int mMapPosY =0; //记录上次时间 private long statrTime = 0; /** * 构造方法 * * @param context */ public MapView(Context context,int screenWidth, int screenHeight) { super(context); mScreenHeight = screenHeight; mScreenWidth = screenWidth; mPaint = new Paint(); mBitmap = ReadBitMap(context, R.drawable.map); mBitMapWidth = mBitmap.getWidth(); mBitMapHeight = mBitmap.getHeight(); mWidthTileCount = mBitMapWidth / TILE_WIDTH; mHeightTileCount = mBitMapHeight / TILE_HEIGHT; statrTime = System.currentTimeMillis(); } @Override protected void onDraw(Canvas canvas) { UpdateCamera(); DrawMap(canvas, mBitmap); DrawRectText(canvas); super.onDraw(canvas); invalidate(); } private void DrawMap(Canvas canvas, Bitmap bitmap) { int i, j; for (i = 0; i < TILE_HEIGHT_COUNT; i++) { for (j = 0; j < TILE_WIDTH_COUNT; j++) { int ViewID = mMapView[i][j]; int ActorID = mMapAcotor[i][j]; int x = (j* TILE_WIDTH) + mMapPosX; int y = (i* TILE_HEIGHT) + mMapPosY; // 绘制地图第一层 if (ViewID > TILE_NULL) { DrawMapTile(ViewID, canvas, mPaint, bitmap, x, y); } // 绘制地图第二层 if (ActorID > TILE_NULL) { DrawMapTile(ActorID, canvas, mPaint, bitmap, x, y); } } } } private void DrawRectText(Canvas canvas) { canvas.clipRect(0, 0,mScreenWidth, 30); mPaint.setColor(Color.WHITE); canvas.drawRect(0, 0,mScreenWidth, 30, mPaint); mPaint.setColor(Color.RED); canvas.drawText("当前摄像头X坐标：" + mCameraPosX + "当前摄像头Y坐标 ：" + mCameraPosY, 0, 20, mPaint); } private void UpdateCamera() { long nowTime = System.currentTimeMillis(); //每100毫秒更新一下摄像头的位置 if(nowTime - statrTime > 1000) { //随机获得摄像头的坐标 mCameraPosX = UtilRandom(0,MAP_WIDTH - mScreenWidth); mCameraPosY = UtilRandom(0,MAP_HEIGHT - mScreenHeight); //根据摄像头的坐标更新地图坐标 mMapPosX = -mCameraPosX; mMapPosY = -mCameraPosY; statrTime = nowTime; } } /** * 返回一个随机数 * @param botton * @param top * @return */ private int UtilRandom(int botton, int top) { return ((Math.abs(new Random().nextInt()) % (top - botton)) + botton); } /** * 根据ID绘制一个tile块 * * @p