GetStrokesFromStrokeRanges Method

Returns the smallest InkStrokes collection that contains a known input InkStrokes collection and for which the IInkRecognizer object can provide alternates.

Declaration

[C++]

HRESULT GetStrokesFromStrokeRanges (
    [in] IInkStrokes* strokes,
    [out, retval] IInkStrokes **GetStrokesFromStrokeRanges
);

[Microsoft® Visual Basic® 6.0]

Public Function GetStrokesFromStrokeRanges( _
    strokes As InkStrokes _
) As InkStrokes

Parameters

strokes

[in] The collection of stroke objects to use to find the smallest stroke collection of the recognition result alternate that contains this collection.

GetStrokesFromStrokeRanges

[out, retval] Returns the smallest collection of strokes that contains a known input collection of strokes and for which the recognizer can provide alternates.

Return Value

Remarks

The returned collection may match the input collection, or it may be larger if the input collection matches only part of the smallest recognition result that includes all of the input strokes.

This method is most useful for single-click word selection. For example, to return the strokes that make up the word you clicked, you can click a stroke, call the HitTest method of the IInkStrokeDisp object to retrieve the stroke that was clicked, and then call GetStrokesFromStrokeRanges.

The stroke ranges are valid until the InkDisp object is modified.

Example

[Visual Basic 6.0]

This Visual Basic 6.0 example shows how to find the InkStrokes collection that is associated with the smallest set of IInkRecognitionAlternate objects that include the strokes selected by clicking the mouse in the drawing space of Form1, where the ink strokes have been recognized and the result is in an IInkRecognitionResult object, theRecognitionResult. This example starts with a standard .exe application, adds a reference to the Microsoft Tablet PC Type Library, and has a text box Text1 and a check box HitTestMode added to the form. When the check box is unchecked, ink is collected and recognized, with the top alternate placed in the text box. When the check box is checked, a click with the mouse or a tap with the pen finds the collection of strokes within a hit test radius of 200 ink space units and colors it red.

Option Explicit
Dim WithEvents theInkCollector As InkCollector
Dim WithEvents theRecognizerContext As InkRecognizerContext
Dim theRecognitionResult As IInkRecognitionResult
Dim hasRecoResult As Boolean
Dim theStrokes As InkStrokes

Private Sub HitTestMode_Click()
    theInkCollector.Enabled = Not theInkCollector.Enabled
End Sub

Private Sub Form_Load()
    ScaleMode = vbPixels
    'Initialize the InkCollector
    Set theInkCollector = New InkCollector
    theInkCollector.hWnd = Me.hWnd
    theInkCollector.Enabled = True
    'Create new RecognizerContext
    Dim theRecognizers As New InkRecognizers
    Dim theRecognizer As IInkRecognizer
    Set theRecognizer = theRecognizers.GetDefaultRecognizer
    Set theRecognizerContext = theRecognizer.CreateRecognizerContext
    'Initialize the recognizer's strokes
    'and assign them to the RecognizerContext
    Set theStrokes = theInkCollector.ink.Strokes
    Set theRecognizerContext.Strokes = theStrokes
    'Clear the hit test check box
    HitTestMode.Value = 0
    hasRecoResult = False
End Sub

Private Sub Form_MouseDown( _
Button As Integer, Shift As Integer, X As Single, Y As Single)
    Dim inkX As Long
    Dim inkY As Long
    Dim hitStrokes As InkStrokes
    Dim AltStrokes As InkStrokes
    ' Convert the mouse down to ink space coordinates
    If hasRecoResult And HitTestMode.Value = 1 Then
        inkX = CLng(X)
        inkY = CLng(Y)
        theInkCollector.Renderer.PixelToInkSpace Form1.hDC, inkX, inkY
        'Get the stroke set hit by the mouse (within a radius
        'of 200 HIMETRIC) and color it red.
        Set hitStrokes = theInkCollector.ink.HitTestCircle(inkX, inkY, 200)
        If hitStrokes.Count > 0 Then
            Set AltStrokes = _
            theRecognitionResult.TopAlternate.GetStrokesFromStrokeRanges(hitStrokes)
            Dim theStroke As IInkStrokeDisp
            For Each theStroke In theInkCollector.ink.Strokes
                theStroke.DrawingAttributes.Color = RGB(0, 0, 0)
            Next
            For Each theStroke In AltStrokes
                theStroke.DrawingAttributes.Color = RGB(255, 0, 0)
            Next
            Form1.Refresh
        End If
    End If
End Sub

Private Sub theRecognizerContext_RecognitionWithAlternates( _
ByVal RecognitionResult As IInkRecognitionResult, _
ByVal CustomData As Variant, _
ByVal RecognitionStatus As MSINKAUTLib.InkRecognitionStatus)
    Set theRecognitionResult = RecognitionResult
    'Update the text box with the top result
    Text1.Text = theRecognitionResult.TopString
    hasRecoResult = True
End Sub

Private Sub theInkCollector_Stroke( _
ByVal Cursor As MSINKAUTLib.IInkCursor, _
ByVal Stroke As MSINKAUTLib.IInkStrokeDisp, _
Cancel As Boolean)
    'When a new stroke is collected, add it to
    'the RecognizerContext's strokes collection
    theStrokes.Add Stroke
    'Tell the RecognizerContext to recognize
    theRecognizerContext.BackgroundRecognizeWithAlternates
End Sub

Applies To

• IInkRecognition Alternate Class

Related Topics

• IInkRecognitionAlternate::GetStrokesFromTextRange Method
• IInkRecognitionAlternate::GetTextRangeFromStrokes Method
• InkStrokes Class