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Практическое руководство. Анализ данных рукописного ввода с помощью подсказок анализа

System.Windows.Ink.AnalysisHintNode предоставляет подсказку для System.Windows.Ink.InkAnalyzer к которому он присоединен. Указание применяется к области, заданной System.Windows.Ink.ContextNode.Location%2A свойство System.Windows.Ink.AnalysisHintNode и предоставляет дополнительный контекст к анализатору рукописного ввода повышения точности распознавания. System.Windows.Ink.InkAnalyzer применяет эти сведения при анализ рукописного ввода полученных в пределах области подсказок.

Пример

Следующий пример — это приложение, в которой используется несколько System.Windows.Ink.AnalysisHintNode объектов в форме, которая принимает входные данные рукописного ввода. Приложение использует System.Windows.Ink.AnalysisHintNode.Factoid%2A свойство, чтобы предоставить сведения о контексте для каждой записи в форме. Приложение использует фоновый анализ для анализа рукописного ввода и очищает формы все рукописные данные через пять секунд после пользователь останавливает добавление рукописного ввода.

<Window x:Class="FormAnalyzer"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="FormAnalyzer"
      SizeToContent="WidthAndHeight"
    >
    <StackPanel Orientation="Vertical">
    <InkCanvas Name="xaml_writingCanvas" Height="500" Width="840" 
               StrokeCollected="RestartAnalysis" >
            <Grid>
                <Grid.Resources>
                    <Style TargetType="{x:Type Label}">
                        <Setter Property="FontSize" Value="20"/>
                        <Setter Property="FontFamily" Value="Arial"/>
                    </Style>

                    <Style TargetType="{x:Type TextBlock}">
                        <Setter Property="FontSize" Value="18"/>
                        <Setter Property="VerticalAlignment" Value="Center"/>
                    </Style>
                </Grid.Resources>
                
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="100"></ColumnDefinition>
                    <ColumnDefinition Width="160"></ColumnDefinition>
                    <ColumnDefinition Width="160"></ColumnDefinition>
                    <ColumnDefinition Width="100"></ColumnDefinition>
                    <ColumnDefinition Width="160"></ColumnDefinition>
                    <ColumnDefinition Width="160"></ColumnDefinition>
                </Grid.ColumnDefinitions>

                <Grid.RowDefinitions>
                    <RowDefinition Height="100"></RowDefinition>
                    <RowDefinition Height="100"></RowDefinition>
                    <RowDefinition Height="100"></RowDefinition>
                    <RowDefinition Height="100"></RowDefinition>
                    <RowDefinition Height="100"></RowDefinition>
                </Grid.RowDefinitions>

                <Label Grid.Row="0" Grid.Column="0">Title</Label>
                <Label Grid.Row="1" Grid.Column="0">Director</Label>
                <Label Grid.Row="2" Grid.Column="0">Starring</Label>
                <Label Grid.Row="3" Grid.Column="0">Rating</Label>
                <Label Grid.Row="3" Grid.Column="3">Year</Label>
                <Label Grid.Row="4" Grid.Column="0">Genre</Label>

                <TextBlock Name="xaml_blockTitle" 
                   Grid.Row="0" Grid.Column="1" 
                   Grid.ColumnSpan="5"/>
        <TextBlock Name="xaml_blockDirector"
                   Grid.Row="1" Grid.Column="1" 
                   Grid.ColumnSpan="5"/>
                <TextBlock Name="xaml_blockStarring"
                   Grid.Row="2" Grid.Column="1" 
                   Grid.ColumnSpan="5"/>
                <TextBlock Name="xaml_blockRating" 
                   Grid.Row="3" Grid.Column="1" 
                   Grid.ColumnSpan="2"/>
                <TextBlock Name="xaml_blockYear" 
                   Grid.Row="3" Grid.Column="4" 
                   Grid.ColumnSpan="2"/>
                <TextBlock Name="xaml_blockGenre" 
                   Grid.Row="4" Grid.Column="1" 
                   Grid.ColumnSpan="5"/>

                <Line Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="6" 
              StrokeThickness="2" Stroke="Black" 
              X1="0" Y1="100" X2="840" Y2="100" />
                <Line Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="6" 
              StrokeThickness="2" Stroke="Black" 
              X1="0" Y1="100" X2="840" Y2="100" />
                <Line Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="6" 
              StrokeThickness="2" Stroke="Black" 
              X1="0" Y1="100" X2="840" Y2="100" />
                <Line Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="6" 
              StrokeThickness="2" Stroke="Black" 
              X1="0" Y1="100" X2="840" Y2="100" />
                <Line Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="6" 
              StrokeThickness="2" Stroke="Black" 
              X1="420" Y1="0" X2="420" Y2="100" />
            </Grid>
        </InkCanvas>
    </StackPanel>
</Window>
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Ink;
using System.Windows.Threading;

public partial class FormAnalyzer : Window
{
    private InkAnalyzer analyzer;

    private AnalysisHintNode hintNodeTitle;
    private AnalysisHintNode hintNodeDirector;
    private AnalysisHintNode hintNodeStarring;
    private AnalysisHintNode hintNodeRating;
    private AnalysisHintNode hintNodeYear;
    private AnalysisHintNode hintNodeGenre;

    // Timer that raises an event to
    // clear the InkCanvas.
    private DispatcherTimer strokeRemovalTimer;

    private const int CLEAR_STROKES_DELAY = 5;

    public FormAnalyzer()
    {
        InitializeComponent();
    }

    protected override void OnContentRendered(EventArgs e)
    {
        base.OnContentRendered(e);

        // Initialize the Analyzer.
        analyzer = new InkAnalyzer();
        analyzer.ResultsUpdated +=
            new ResultsUpdatedEventHandler(analyzer_ResultsUpdated);

        // Add analysis hints for each form area.
        // Use the absolute Width and Height of the Grid's
        // RowDefinition and ColumnDefinition properties defined in XAML,
        // to calculate the bounds of the AnalysisHintNode objects.
        hintNodeTitle = analyzer.CreateAnalysisHint(
                                    new Rect(100, 0, 740, 100));
        hintNodeDirector = analyzer.CreateAnalysisHint(
                                    new Rect(100, 100, 740, 100));
        hintNodeStarring = analyzer.CreateAnalysisHint(
                                    new Rect(100, 200, 740, 100));
        hintNodeRating = analyzer.CreateAnalysisHint(
                                    new Rect(100, 300, 320, 100));
        hintNodeYear = analyzer.CreateAnalysisHint(
                                    new Rect(520, 300, 320, 100));
        hintNodeGenre = analyzer.CreateAnalysisHint(
                                    new Rect(100, 400, 740, 100));

        //Set the factoids on the hints.
        hintNodeTitle.Factoid = "(!IS_DEFAULT)";
        hintNodeDirector.Factoid = "(!IS_PERSONALNAME_FULLNAME)";
        hintNodeStarring.Factoid = "(!IS_PERSONALNAME_FULLNAME)";
        hintNodeRating.Factoid = "(!IS_DEFAULT)";
        hintNodeYear.Factoid = "(!IS_DATE_YEAR)";
        hintNodeGenre.Factoid = "(!IS_DEFAULT)";
    }

    /// <summary>
    /// InkCanvas.StrokeCollected event handler.  Begins
    /// ink analysis and starts the timer to clear the strokes.
    /// If five seconds pass without a Stroke being added,
    /// the strokes on the InkCanvas will be cleared.
    /// </summary>
    /// <par    am name="sender">InkCanvas that raises the
    /// StrokeCollected event.</param>
    /// <param name="args">Contains the event data.</param>
    private void RestartAnalysis(object sender,
                    InkCanvasStrokeCollectedEventArgs args)
    {

        // If strokeRemovalTimer is enabled, stop it.
        if (strokeRemovalTimer != null && strokeRemovalTimer.IsEnabled)
        {
            strokeRemovalTimer.Stop();
        }

        // Restart the timer to clear the strokes in five seconds
        strokeRemovalTimer = new DispatcherTimer(
                             TimeSpan.FromSeconds(CLEAR_STROKES_DELAY),
                             DispatcherPriority.Normal,
                             ClearCanvas,
                             Dispatcher.CurrentDispatcher);

        // Add the new stroke to the InkAnalyzer and
        // begin background analysis.
        analyzer.AddStroke(args.Stroke);
        analyzer.BackgroundAnalyze();
    }

    /// <summary>
    /// Analyzer.ResultsUpdated event handler.
    /// </summary>
    /// <param name="sender">InkAnalyzer that raises the
    /// event.</param>
    /// <param name="e">Event data</param>
    /// <remarks>This method checks each AnalysisHint for
    /// analyzed ink and then populated the TextBlock that
    /// corresponds to the area on the form.</remarks>
    void analyzer_ResultsUpdated(object sender, ResultsUpdatedEventArgs e)
    {
        string recoText;

        recoText = hintNodeTitle.GetRecognizedString();
        if (recoText != "") xaml_blockTitle.Text = recoText;

        recoText = hintNodeDirector.GetRecognizedString();
        if (recoText != "") xaml_blockDirector.Text = recoText;

        recoText = hintNodeStarring.GetRecognizedString();
        if (recoText != "") xaml_blockStarring.Text = recoText;

        recoText = hintNodeRating.GetRecognizedString();
        if (recoText != "") xaml_blockRating.Text = recoText;

        recoText = hintNodeYear.GetRecognizedString();
        if (recoText != "") xaml_blockYear.Text = recoText;

        recoText = hintNodeGenre.GetRecognizedString();
        if (recoText != "") xaml_blockGenre.Text = recoText;
    }

    //Clear the canvas, but leave the current strokes in the analyzer.
    private void ClearCanvas(object sender, EventArgs args)
    {
        strokeRemovalTimer.Stop();

        xaml_writingCanvas.Strokes.Clear();
    }
}
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