IInkStrokeDisp::FindIntersections method (msinkaut.h)

Article
10/13/2021

Retrieves the points where this IInkStrokeDisp object intersects other IInkStrokeDisp objects within a known InkStrokes collection.

Syntax

HRESULT FindIntersections(
  [in]          IInkStrokes *Strokes,
  [out, retval] VARIANT     *Intersections
);

Parameters

[in] Strokes

The known collection of strokes that are used to calculate the points where this stroke intersects strokes in the collection. If NULL, use all strokes in the InkDisp object.

Note The known collection of strokes must come from the same InkDisp object as the stroke being tested for intersection. If it is not from the same InkDisp object, E_INK_MISMATCHED_INK_OBJECT is returned (see "HRESULT value" below). The FindIntersections method is the only Tablet PC application programming interface (API) that requires that the known collection of strokes come from the same InkDisp object.

[out, retval] Intersections

When this method returns, contains an array of floating point index values that indicate the locations where this stroke intersects strokes within a known collection of strokes.

A floating point index is a float value that represents a location somewhere between two points in the stroke. As examples, if 0.0 is the first point in the stroke and 1.0 is the second point in the stroke, 0.5 is halfway between the first and second points. Similarly, a floating point index value of 37.25 represents a location that is 25 percent along the line between points 37 and 38 of the stroke.

For more information about the VARIANT structure, see Using the COM Library.

Return value

This method can return one of these values.

Return code	Description
S_OK	Success.
E_POINTER	A parameter contained an invalid pointer.
E_OUTOFMEMORY	Cannot allocate an IInkStrokeDisp handle helper object.
E_UNEXPECTED	Unexpected parameter or property type.
E_INK_EXCEPTION	An exception occurred inside the method.
E_INK_INCOMPATIBLE_OBJECT	The strokes parameter does not point to a compatible InkDisp object.
E_INK_MISMATCHED_INK_OBJECT	The InkDisp object of the InkStrokes collection and this IInkStrokeDisp object don't match.

Remarks

This method can determine only the points of intersection.

Requirements

Requirement	Value
Minimum supported client	Windows XP Tablet PC Edition [desktop apps only]
Minimum supported server	None supported
Target Platform	Windows
Header	msinkaut.h
Library	InkObj.dll