如何：通过分析提示来分析墨迹
更新：2007 年 11 月
AnalysisHintNode 为其所附加到的 InkAnalyzer 提供提示。 提示适用于 AnalysisHintNode 的 Location 属性指定的区域，并向墨迹分析器提供额外的上下文以提高识别的准确性。InkAnalyzer 在分析从提示区域中获得的墨迹时将应用此上下文信息。
示例
下面的示例是一个在接受墨迹输入的窗体上使用多个 AnalysisHintNode 对象的应用程序。此应用程序使用 Factoid 属性为窗体上的每一项提供上下文信息。 此应用程序使用背景分析来分析墨迹并在用户停止添加墨迹五秒钟后清除窗体上的所有墨迹。
<Window x:Class="FormAnalyzer"
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://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>
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Ink
Imports System.Windows.Threading
Class FormAnalyzer
Inherits Window
Private analyzer As InkAnalyzer
Private hintNodeTitle As AnalysisHintNode
Private hintNodeDirector As AnalysisHintNode
Private hintNodeStarring As AnalysisHintNode
Private hintNodeRating As AnalysisHintNode
Private hintNodeYear As AnalysisHintNode
Private hintNodeGenre As AnalysisHintNode
' Timer that raises an event to
' clear the InkCanvas.
Private strokeRemovalTimer As DispatcherTimer
Private Const CLEAR_STROKES_DELAY As Integer = 5
Public Sub New()
InitializeComponent()
End Sub 'New
Protected Overrides Sub OnContentRendered(ByVal e As EventArgs)
MyBase.OnContentRendered(e)
' Initialize the Analyzer.
analyzer = New InkAnalyzer()
AddHandler analyzer.ResultsUpdated, AddressOf 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)"
End Sub 'OnContentRendered
' <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>
' <param name="sender">InkCanvas that raises the
' StrokeCollected event.</param>
' <param name="args">Contains the event data.</param>
Private Sub RestartAnalysis(ByVal sender As Object, ByVal args As InkCanvasStrokeCollectedEventArgs)
' If strokeRemovalTimer is enabled, stop it.
If Not (strokeRemovalTimer Is Nothing) AndAlso strokeRemovalTimer.IsEnabled Then
strokeRemovalTimer.Stop()
End If
' Restart the timer to clear the strokes in five seconds
strokeRemovalTimer = New DispatcherTimer( _
TimeSpan.FromSeconds(CLEAR_STROKES_DELAY), _
DispatcherPriority.Normal, _
AddressOf ClearCanvas, _
System.Windows.Threading.Dispatcher.CurrentDispatcher)
' Add the new stroke to the InkAnalyzer and
' begin background analysis.
analyzer.AddStroke(args.Stroke)
analyzer.BackgroundAnalyze()
End Sub 'RestartAnalysis
' <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>
Private Sub analyzer_ResultsUpdated(ByVal sender As Object, ByVal e As ResultsUpdatedEventArgs)
Dim recoText As String
recoText = hintNodeTitle.GetRecognizedString()
If recoText <> "" Then
xaml_blockTitle.Text = recoText
End If
recoText = hintNodeDirector.GetRecognizedString()
If recoText <> "" Then
xaml_blockDirector.Text = recoText
End If
recoText = hintNodeStarring.GetRecognizedString()
If recoText <> "" Then
xaml_blockStarring.Text = recoText
End If
recoText = hintNodeRating.GetRecognizedString()
If recoText <> "" Then
xaml_blockRating.Text = recoText
End If
recoText = hintNodeYear.GetRecognizedString()
If recoText <> "" Then
xaml_blockYear.Text = recoText
End If
recoText = hintNodeGenre.GetRecognizedString()
If recoText <> "" Then
xaml_blockGenre.Text = recoText
End If
End Sub 'analyzer_ResultsUpdated
'Clear the canvas, but leave the current strokes in the analyzer.
Private Sub ClearCanvas(ByVal sender As Object, ByVal args As EventArgs)
strokeRemovalTimer.Stop()
xaml_writingCanvas.Strokes.Clear()
End Sub 'ClearCanvas
End Class 'FormAnalyzer
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();
}
}