private void timer1_Tick(object sender, EventArgs e)
        {
            time++;
            background.Margin = new Thickness(background.Margin.Left - 0.5, background.Margin.Top, 0, 0);
            for (int i = 2; i < total + 2; i++)
            {

                /*if (distance < 40 || distance >= 70)
                {*/
                    //Canvas.SetTop(canvas.Children[i], Canvas.GetTop(canvas.Children[i]) - 6 + difficulty / 7);
                    Canvas.SetLeft(canvas.Children[i], Canvas.GetLeft(canvas.Children[i]) -3 - difficulty / 7);

                    if (Canvas.GetLeft(image) + 70 > Canvas.GetLeft(canvas.Children[i]) && Canvas.GetLeft(canvas.Children[i]) > 30)
                        if ((Canvas.GetTop(image) + image.Height >= Canvas.GetTop(canvas.Children[i]) && Canvas.GetTop(image) + image.Height <= Canvas.GetTop(canvas.Children[i]) + 155) || (Canvas.GetTop(image) >= Canvas.GetTop(canvas.Children[i]) && Canvas.GetTop(image) <= Canvas.GetTop(canvas.Children[i]) + 155))
                        {
                            player.Stop();
                            money.Stop();
                            timer.Stop();
                            MessageBox.Show("飛行時間:" + distance + "秒");

                            MainWindow mw = new MainWindow();
                            this.Close();
                            mw.Show();

                        }
                }
        }
 private void ReturnToMainWindow(object sender, RoutedEventArgs e)
 {
     MainWindow mw = new MainWindow();
     this.Close();
     mw.Show();
 }