WPF中InkCanvas基本操作方法的示例分析

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WPF的InkCanvas就是一个画板，可以在上面随意涂鸦，每写上一笔，InkCanvas的Strokes集合里就新增一个涂鸦对象，下面的代码演示了基本的操作。

效果图

xaml代码

<Window x:Class="WPF_InkCanvas.MainWindow"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"     xmlns:local="clr-namespace:WPF_InkCanvas"     mc:Ignorable="d"     Title="MainWindow" Height="450" Width="800">   <Grid>     <Grid.RowDefinitions>       <RowDefinition/>       <RowDefinition Height="auto"/>       <RowDefinition Height="auto"/>     </Grid.RowDefinitions>     <Image Name="imgMeasure" HorizontalAlignment="Center" Stretch="Uniform"/>     <InkCanvas Name="inkCanvasMeasure" EditingMode="None" Background="Transparent" HorizontalAlignment="Center"            Width="{Binding ElementName=imgMeasure, Path=ActualWidth}" Height="{Binding ElementName=imgMeasure, Path=ActualHeight}"           >       <!--MouseDown="InkCanvasMeasure_MouseDown" MouseMove="InkCanvasMeasure_MouseMove"-->       <Label Content="{Binding MeaInfo}" Background="Transparent" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10"            FontSize="18" Foreground="Red" IsHitTestVisible="False"/>     </InkCanvas>     <Grid Grid.Row="1">       <Grid.ColumnDefinitions>         <ColumnDefinition/>         <ColumnDefinition/>         <ColumnDefinition/>         <ColumnDefinition/>         <ColumnDefinition/>       </Grid.ColumnDefinitions>       <RadioButton Grid.Column="0" Content="绘制墨迹" Click="RadioButton_Click"/>       <RadioButton Grid.Column="1" Content="按点擦除" Click="RadioButton_Click"/>       <RadioButton Grid.Column="2" Content="按线擦除" Click="RadioButton_Click"/>       <RadioButton Grid.Column="3" Content="选中墨迹" Click="RadioButton_Click"/>       <RadioButton Grid.Column="4" Content="停止操作" Click="RadioButton_Click"/>     </Grid>     <StackPanel Grid.Row="2" Orientation="Horizontal">       <Button Content="OpenFile" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="OpenFile_Click"/>       <Button Content="SaveInkCanvas" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="SaveInkCanvas_Click"/>       <Button Content="LoadInkCanvas" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="LoadInkCanvas_Click"/>       <Button Content="CopyInkCanvas" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="CopyInkCanvas_Click"/>       <Button Content="PasteInkCanvas" Margin="5" HorizontalAlignment="Left" FontSize="20" Click="PasteInkCanvas_Click"/>     </StackPanel>   </Grid> </Window>

后台代码

using Microsoft.Win32; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes;   namespace WPF_InkCanvas {   /// <summary>   /// MainWindow.xaml 的交互逻辑   /// </summary>   public partial class MainWindow : Window   {     ViewModel viewModel;     public MainWindow()     {       InitializeComponent();         DrawingAttributes drawingAttributes = new DrawingAttributes       {         Color = Colors.Red,         Width = 2,         Height = 2,         StylusTip = StylusTip.Rectangle,         FitToCurve = true,         IsHighlighter = false,         IgnorePressure = true,         };       inkCanvasMeasure.DefaultDrawingAttributes = drawingAttributes;         viewModel = new ViewModel       {         MeaInfo = "测试······",       };         DataContext = viewModel;     }       private void InkCanvasMeasure_MouseDown(object sender, MouseButtonEventArgs e)     {       }       private void InkCanvasMeasure_MouseMove(object sender, MouseEventArgs e)     {       }       private void OpenFile_Click(object sender, RoutedEventArgs e)     {       OpenFileDialog openDialog = new OpenFileDialog       {         Filter = "Image Files (*.jpg)|*.jpg|Image Files (*.png)|*.png|Image Files (*.bmp)|*.bmp",         Title = "Open Image File"       };       if (openDialog.ShowDialog() == true)       {         BitmapImage image = new BitmapImage();         image.BeginInit();         image.UriSource = new Uri(openDialog.FileName, UriKind.RelativeOrAbsolute);         image.EndInit();         imgMeasure.Source = image;       }     }       private void RadioButton_Click(object sender, RoutedEventArgs e)     {       if ((sender as RadioButton).Content.ToString() == "绘制墨迹")       {         inkCanvasMeasure.EditingMode = InkCanvasEditingMode.Ink;       }         else if ((sender as RadioButton).Content.ToString() == "按点擦除")       {         inkCanvasMeasure.EditingMode = InkCanvasEditingMode.EraseByPoint;       }         else if ((sender as RadioButton).Content.ToString() == "按线擦除")       {         inkCanvasMeasure.EditingMode = InkCanvasEditingMode.EraseByStroke;       }         else if ((sender as RadioButton).Content.ToString() == "选中墨迹")       {         inkCanvasMeasure.EditingMode = InkCanvasEditingMode.Select;       }         else if ((sender as RadioButton).Content.ToString() == "停止操作")       {         inkCanvasMeasure.EditingMode = InkCanvasEditingMode.None;       }     }       private void SaveInkCanvas_Click(object sender, RoutedEventArgs e)     {       FileStream fileStream = new FileStream("inkCanvas.isf", FileMode.Create, FileAccess.ReadWrite);       inkCanvasMeasure.Strokes.Save(fileStream);       fileStream.Close();     }       private void LoadInkCanvas_Click(object sender, RoutedEventArgs e)     {       FileStream fileStream = new FileStream("inkCanvas.isf", FileMode.Open, FileAccess.Read);       inkCanvasMeasure.Strokes = new StrokeCollection(fileStream);       fileStream.Close();     }       private void CopyInkCanvas_Click(object sender, RoutedEventArgs e)     {       inkCanvasMeasure.CopySelection();     }     private void PasteInkCanvas_Click(object sender, RoutedEventArgs e)     {       inkCanvasMeasure.Paste();     }   } }

ViewModel.cs代码

using System; using System.Collections.Generic; using System.ComponentModel; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace WPF_InkCanvas {   class ViewModel : INotifyPropertyChanged   {     public event PropertyChangedEventHandler PropertyChanged;       protected virtual void OnPropertyChanged(string propertyName = null)     {       if (PropertyChanged != null)         PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));     }       private string meaInfo;     public string MeaInfo     {       get => meaInfo;       set       {         meaInfo = value;         OnPropertyChanged("MeaInfo");       }     }   } }

补充说明：将Image和InkCanvas放到一个Grid里，并且将InkCanvas的长宽绑定到Image，这样Image和InkCanvas的位置就是对应的，方便我后续在InkCanvas上提取Image的感兴趣区域；InkCanvas里加了一个Label可以实现类似图片上添加文字说明的功能，要设置Label的IsHitTestVisible="False"，不然点击事件就没办法触发了。

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