WPF背景灯光随鼠标闪动 WPF实现背景灯光随鼠标闪动效果
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实现效果如下:
思路:将容器分割成组合三角形Path,鼠标移动时更新每个三角形的填充颜色。
步骤:
1、窗体xaml
只需放置一个Canvas。
<Canvas x:Name="container" Width="400" Height="400"></Canvas>
2、交互逻辑
/// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> 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 < horizontalCount; i++) { for (int j = 0; j < verticalCount; j++) { Path trianglePath1 = new Path(); var g1 = new StreamGeometry(); using (StreamGeometryContext context = g1.Open()) { context.BeginFigure(new Point(i * triangleLength, j * triangleLength), true, true); context.LineTo(new Point(i * triangleLength, (j + 1) * triangleLength), true, false); context.LineTo(new Point((i + 1) * triangleLength, (j + 1) * triangleLength), true, false); } trianglePath1.Data = g1; trianglePath1.Fill = new SolidColorBrush(Color.FromArgb(255, 247, 18, 65)); this.container.Children.Add(trianglePath1); Path trianglePath2 = new Path(); var g2 = new StreamGeometry(); using (StreamGeometryContext context = g2.Open()) { context.BeginFigure(new Point(i * triangleLength, j * triangleLength), true, true); context.LineTo(new Point((i + 1) * triangleLength, j * triangleLength), true, false); context.LineTo(new Point((i + 1) * triangleLength, (j + 1) * triangleLength), true, false); } trianglePath2.Data = g2; trianglePath2.Fill = new SolidColorBrush(Color.FromArgb(255, 247, 18, 65)); this.container.Children.Add(trianglePath2); } } } private void UpdateTriangle(object sender, EventArgs e) { //获取子控件 List<Path> childList = GetChildObjects<Path>(this.container); for (int i = 0; i < childList.Count; i++) { for (int j = 1; j < childList.Count; j++) { string si = childList[i].Data.ToString(); string si1 = MidStrEx(si, "M", "L"); string si2 = MidStrEx(si, "L", " "); string si3 = MidStrEx(si, " ", "z"); string sj = childList[j].Data.ToString(); string sj1 = MidStrEx(sj, "M", "L"); string sj2 = MidStrEx(sj, "L", " "); string sj3 = MidStrEx(sj, " ", "z"); //左右三角形判断 if (si1 == sj1 && si3 == sj3) { double x = childList[i].Data.Bounds.X + (1 - Math.Pow(2, 0.5) / 2) * triangleLength - lastMousePosition.X; double y = childList[i].Data.Bounds.Y + (1 - Math.Pow(2, 0.5) / 2) * triangleLength - lastMousePosition.Y; double rRadio = 1 - Math.Pow(x * x + y * y, 0.5) / Math.Pow(this.container.ActualWidth * this.container.ActualWidth + this.container.ActualHeight * this.container.ActualHeight, 0.5); childList[j].Fill = new SolidColorBrush(Color.FromArgb((byte)(255 * rRadio), 247, 18, 65)); x = childList[j].Data.Bounds.TopRight.X - (1 - Math.Pow(2, 0.5) / 2) * triangleLength - lastMousePosition.X; rRadio = 1 - Math.Pow(x * x + y * y, 0.5) / Math.Pow(this.container.ActualWidth * this.container.ActualWidth + this.container.ActualHeight * this.container.ActualHeight, 0.5); childList[i].Fill = new SolidColorBrush(Color.FromArgb((byte)(255 * rRadio), 247, 18, 65)); break; } } } } private void UpdateLastMousePosition(object sender, MouseEventArgs e) { lastMousePosition = e.GetPosition(this.container); } /// <summary> /// 获得所有子控件 /// </summary> private List<T> GetChildObjects<T>(System.Windows.DependencyObject obj) where T : System.Windows.FrameworkElement { System.Windows.DependencyObject child = null; List<T> childList = new List<T>(); for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++) { child = VisualTreeHelper.GetChild(obj, i); if (child is T) { childList.Add((T)child); } childList.AddRange(GetChildObjects<T>(child)); } return childList; } /// <summary> /// 截取两个指定字符中间的字符串 /// </summary> 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; } }
说明:当组合三角形过多时,会有明显卡顿,需要优化色彩更新方法。
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