WPF实现背景灯光随鼠标闪动效果

/// 

/// MainWindow.xaml 的交互逻辑
/// 
 public partial class MainWindow : Window
 {
  private Point lastMousePosition = new Point(0, 0);//鼠标位置
  private int triangleLength = 100;//三角形边长
 
  public MainWindow()
  {
   InitializeComponent();
   this.Loaded += MainWindow_Loaded;
   CompositionTarget.Rendering += UpdateTriangle;
   this.container.PreviewMouseMove += UpdateLastMousePosition;
  }
 
  private void MainWindow_Loaded(object sender, RoutedEventArgs e)
  {
   //将长方形容易划分成组合三角形
   int horizOntalCount= (int)(this.container.ActualWidth / triangleLength);
   int verticalCount = (int)(this.container.ActualHeight / triangleLength);
   for (int i = 0; i  childList = GetChildObjects(this.container);
   for (int i = 0; i 
  /// 获得所有子控件
  /// 
  private List GetChildObjects(System.Windows.DependencyObject obj) where T : System.Windows.FrameworkElement
  {
   System.Windows.DependencyObject child = null;
   List childList = new List();
   for (int i = 0; i (child));
   }
   return childList;
  }
 
  /// 

  /// 截取两个指定字符中间的字符串
  /// 
  public static string MidStrEx(string sourse, string startstr, string endstr)
  {
   string result = string.Empty;
   int startindex, endindex;
   try
   {
    startindex = sourse.IndexOf(startstr);
    if (startindex == -1)
     return result;
    string tmpstr = sourse.Substring(startindex + startstr.Length);
    endindex = tmpstr.IndexOf(endstr);
    if (endindex == -1)
     return result;
    result = tmpstr.Remove(endindex);
   }
   catch (Exception ex)
   {
   }
   return result;
  }
}