在教学和演示中，我们通常需要对重点进行批注，下载安装第三方工具批注显得很麻烦。本篇使用WPF开发了一个批注工具，工具小巧，功能丰富，非常使用日常免费使用，或者进行再次开发。
自制批注工具具有以下功能特点：
- 支持图画，擦除，撤销，恢复，改变画板颜色功能
- 提供颜色选择和线条大小设置功能
- 方便演示教学
示例代码如下：
Stack<StrokeCollection> undoStack = new Stack<StrokeCollection>();//撤销Stack<StrokeCollection> recoverStack = new Stack<StrokeCollection>();//恢复撤销public MainWindow(){InitializeComponent();try{EraserCanvas.MouseDown += EraserCanvas_MouseDown;EraserCanvas.MouseMove += EraserCanvas_MouseMove;EraserCanvas.MouseUp += EraserCanvas_MouseUp;Global.Instance.CurrentCanvas.PreviewMouseDown += WriteBorad_PreviewMouseDown;InkCanvasRootPanel.Children.Clear();InkCanvasRootPanel.Children.Add(Global.Instance.CurrentCanvas);}catch (Exception){}}private void Window_Loaded(object sender, RoutedEventArgs e){//设置色板和清空橡皮位置Window window = Window.GetWindow(rdoPen);Point point = rdoPen.TransformToAncestor(window).Transform(new Point(0, 0));translateColor.X = translateColor.X - 100;translateEraser.X = translateEraser.X-30;if (rdoPenWidthMin.Content.ToString() == Global.Instance.ColorHelper.selectedPenWidth.Trim())rdoPenWidthMin.IsChecked = true;else if (rdoPenWidthMedium.Content.ToString() == Global.Instance.ColorHelper.selectedPenWidth.Trim())rdoPenWidthMedium.IsChecked = true;else if (rdoPenWidthMax.Content.ToString() == Global.Instance.ColorHelper.selectedPenWidth.Trim())rdoPenWidthMax.IsChecked = true;//初始化色板foreach (string color in Global.Instance.ColorHelper.colorList){RadioButton btntemp = new RadioButton();btntemp.SetResourceReference(StyleProperty, "ColorSelectStyle");btntemp.Width = 30;btntemp.Height = 30;btntemp.Margin = new Thickness(2, 2, 2, 0);btntemp.Background = new SolidColorBrush((System.Windows.Media.Color)ColorConverter.ConvertFromString(color));if (btntemp.Background.ToString() == Global.Instance.ColorHelper.selectedColor){btntemp.IsChecked = true;Global.Instance.CurrentCanvas.DefaultDrawingAttributes.Color =(System.Windows.Media.Color)ColorConverter.ConvertFromString((string)Global.Instance.ColorHelper.selectedColor);} uniformColor.Children.Add(btntemp);}}#region InkCanvas操作bool transformColorFlag = false;bool transformEraserClearFlag = false;private void RadioButton_Click(object sender, RoutedEventArgs e){//橡皮模式下选择其他工具关闭橡皮擦功能EraserCanvas.Visibility = Visibility.Collapsed;_eraserisDown = false;//如果色板打开下选择其他工具,隐藏色板工具if (!(bool)rdoPen.IsChecked){transformColorFlag = false;translateColor.Y = 300;}if (!(bool)rdoEraser.IsChecked){transformEraserClearFlag = false;translateEraser.Y = 100;}if ((sender as RadioButton).Content.ToString() == "画笔"){//Topmost = false;this.Background = (Brush)new BrushConverter().ConvertFromString("#01000000");if (transformColorFlag){translateColor.Y = -10;}else{translateColor.Y = 300;}transformColorFlag = !transformColorFlag;Global.Instance.CurrentCanvas.EditingMode = InkCanvasEditingMode.Ink;}else if ((sender as RadioButton).Content.ToString() == "橡皮"){this.Background = (Brush)new BrushConverter().ConvertFromString("#01000000");if (transformEraserClearFlag){translateEraser.Y = -10;}else{translateEraser.Y = 100;}transformEraserClearFlag = !transformEraserClearFlag;Global.Instance.CurrentCanvas.EditingMode = InkCanvasEditingMode.None;EraserCanvas.Visibility = Visibility.Visible;TranslateTransform.X = -1000;TranslateTransform.Y = -1000;}else if ((sender as RadioButton).Content.ToString() == "选择"){//Topmost = true;this.Background = System.Windows.Media.Brushes.Transparent;Global.Instance.CurrentCanvas.EditingMode = InkCanvasEditingMode.None;// Global.Instance.CurrentCanvas.EditingMode = InkCanvasEditingMode.Select;}else if ((sender as RadioButton).Content.ToString() == "撤销"){if (undoStack.Count > 0){recoverStack.Push(Global.Instance.CurrentCanvas.Strokes.Clone());Global.Instance.CurrentCanvas.Strokes = undoStack.Pop();}}else if ((sender as RadioButton).Content.ToString() == "恢复"){if (recoverStack.Count > 0){undoStack.Push( Global.Instance.CurrentCanvas.Strokes.Clone());Global.Instance.CurrentCanvas.Strokes = recoverStack.Pop();}}}#endregion
实例链接：https://download.csdn.net/download/lvxingzhe3/89505204
