CreateStrokes Method
CreateStrokes Method |
Declaration
[C++]
HRESULT CreateStrokes (
[in, optional, defaultvalue(0)] VARIANT ids,
[out, retval] IInkStrokes** strokes
);
[Microsoft® Visual Basic® 6.0]
Public Function CreateStrokes( _
[Optional ids() as Long = Nothing] _
) As InkStrokes
Parameters
ids
[in, optional] Specifies an array of stroke IDs that exist in the InkDisp object. The strokes with these IDs are added to a new InkStrokes collection. The default value is NULL (Nothing in Visual Basic 6.0).
For more information about the VARIANT structure, see Using the Automation Library.
strokes
[out, retval] Returns a new InkStrokes collection.
Return Value
| HRESULT value | Description |
|---|---|
| S_OK | Success. |
| E_POINTER | A parameter contained an invalid pointer. |
| E_INVALIDARG | Invalid VARIANT type (only VT_ARRAY | VT_I4 supported). |
| E_INK_EXCEPTION | An exception occurred inside the method. |
| E_OUTOFMEMORY | Cannot allocate memory to create the new Strokes collection. |
| TPC_E_INVALID_STROKE | Stroke IDs that do not exist were passed to the method. |
Remarks
If the ids parameter is NULL or an empty array, then an empty InkStrokes collection is created.
Example
[Visual Basic 6.0]
This Visual Basic 6.0 example uses a command button, Command1, to invoke a function, DeleteStrokesOnLeft, that deletes all of the strokes in the InkDisp object, theInkCollector.Ink, that are to the left of the ptLeft parameter, and returns a count of the deleted strokes.
Dim theInkCollector As InkCollector
Private Sub Command1_Click()
' On button press, delete all strokes with points
' to the left of a line at x=5000 in ink space
DeleteStrokesOnLeft 5000
Form1.Refresh
End Sub
Private Sub Form_Load()
Set theInkCollector = New InkCollector
theInkCollector.hWnd = Me.hWnd
theInkCollector.Enabled = True
End Sub
Public Function DeleteStrokesOnLeft( _
ByVal ptLeft As Long _
) As Long
Dim i As Integer
Dim ptTest As Long
Dim stroke As IInkStrokeDisp
Dim strokesToDelete As InkStrokes
Dim ptStrokePoints As Variant
' Create an object to hold strokes to be deleted
Set strokesToDelete = theInkCollector.Ink.CreateStrokes
For Each stroke In theInkCollector.Ink.Strokes
' The points are returned as an array of Long,
' in the form of x1, y1, x2, y2, ...
ptStrokePoints = stroke.GetPoints
' Determine the final x,y pair starting at 0
Dim pointUBound As Long
pointUBound = (UBound(ptStrokePoints) - 1) \ 2
For i = 0 To pointUBound
' Get the next point x value
ptTest = ptStrokePoints(i * 2)
' If there is a point in this stroke left of the parameter,
If ptTest < ptLeft Then
' add this stroke to the collection to delete
strokesToDelete.Add stroke
' then exit, because we don't need to test further.
Exit For
End If
Next
Next
If 0 < strokesToDelete.Count Then
' Delete the strokes we collected on the left
theInkCollector.Ink.DeleteStrokes strokesToDelete
End If
DeleteStrokesOnLeft = strokesToDelete.Count
End Function
