android自己写的类似刻度尺的东西(3)

        //刻度游标 
        private Bitmap pointer; 
 
        //总刻度数 
        private static final int KEDU_COUNT = 25; 
        //刻度最小值 
        private float init_min; 
        //每个刻度的单位值 
        private float interval; 
 
        public KeduView(Context context, float init_min, float interval) { 
            super(context); 
            mSurfaceHolder = this.getHolder();   
            mSurfaceHolder.addCallback(this);   
            this.setFocusable(true); 
            background = BitmapFactory.decodeResource(getResources(), R.drawable.kedu_bg); 
            pointer = BitmapFactory.decodeResource(getResources(), R.drawable.kedu_pointer); 
             
            this.init_min = init_min; 
            this.interval = interval; 
        } 
 
        @Override 
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 
             
        } 
 
        @Override 
        public void surfaceCreated(SurfaceHolder holder) { 
            new Thread(this).start(); 
        } 
 
        @Override 
        public void surfaceDestroyed(SurfaceHolder holder) { 
             
        } 
         
        @Override