/// 
    /// 可用于自身或导航至 Frame 内部的空白页。    /// 
    public sealed partial class MainPage : Page    {        public MainPage()        {            this.InitializeComponent();        }        Point start = new Point();        /// 
        /// 在此页将要在 Frame 中显示时进行调用。        /// 
        /// 描述如何访问此页的事件数据。Parameter        /// 属性通常用于配置页。        protected override void OnNavigatedTo(NavigationEventArgs e)        {        }        //鼠标中键滑动事件        private void MainCanvas_PointerWheelChanged(object sender, PointerRoutedEventArgs e)        {            this.tbLabel.Text = "滑动了一次鼠标中箭";        }        //鼠标点击下去的事件        private void MainCanvas_PointerPressed(object sender, PointerRoutedEventArgs e)        {            start = e.GetCurrentPoint(MainCanvas).Position;            this.tbLabel.Text = "点击了一次鼠标或者屏幕";        }        //鼠标松键事件        private void MainCanvas_PointerReleased(object sender, PointerRoutedEventArgs e)        {            Point end = e.GetCurrentPoint(MainCanvas).Position;            double angle = 0;            //判断拖动鼠标角度            if (Math.Abs(end.X - start.X) < 1 && Math.Abs(end.Y - start.Y) < 1)            {                angle = 0;            }            else if (end.X > start.X)            {                if (end.Y > start.Y)                {                    angle = 360 - Math.Atan((end.Y - start.Y) * 1.0 / (end.X - start.X)) * 180 / Math.PI;                }                else                {                    angle = Math.Atan((start.Y - end.Y) * 1.0 / (end.X - start.X)) * 180 / Math.PI;                }            }            else if (end.X < start.X)            {                if (end.Y > start.Y)                {                    angle = Math.Atan((end.Y - start.Y) * 1.0 / (start.X - end.X)) * 180 / Math.PI + 180;                }                else                {                    angle = 180 - Math.Atan((start.Y - end.Y) * 1.0 / (start.X - end.X)) * 180 / Math.PI;                }            }            if (angle == 0)            {                this.tbLabel.Text = "点击了一次鼠标或者屏幕";            }            else if (angle >= 45 && angle < 135)            {                this.tbLabelFore.Text = "从下往上";            }            else if (angle <= 45 || angle > 315)            {                this.tbLabelFore.Text = "从左向右滑";            }            else if (angle >= 135 && angle < 225)            {                this.tbLabelFore.Text = "从右向左滑";            }            else if (angle >= 225 && angle < 315)            {                this.tbLabelFore.Text = "从上往下";            }        }                //鼠标移动事件        private void MainCanvas_PointerMoved(object sender, PointerRoutedEventArgs e)        {            Point point = e.GetCurrentPoint(MainCanvas).Position;            this.tbLabel.Text = "鼠标正在移动X:"+point.X+",Y:"+point.Y;        }        //鼠标移出范围事件        private void MainCanvas_PointerExited(object sender, PointerRoutedEventArgs e)        {            this.tbLabelNext.Text = "鼠标移出作用范围";        }        //鼠标进入范围事件        private void MainCanvas_PointerEntered(object sender, PointerRoutedEventArgs e)        {            this.tbLabelNext.Text = "鼠标进入范围";        }    }