CreatePenDataRegion - Microsoft Windows Pen API Programmer's Reference

Microsoft Windows Pen API Programmer's Reference

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CreatePenDataRegion

2.0

Creates a region that envelops the point data in an HPENDATA object.

HRGN CreatePenDataRegion( HPENDATA hpndt, UINT uType )

Parameters
hpndt

Handle to the HPENDATA object.

uType

Type of region to create. This can be one of the following values:

CPDR_BOX

The bounding box of the pen data ink is converted to a region.

CPDR_LASSO

The pen data describes a lasso that makes up the boundary of the region. If the last point of the pen data does not coincide with the first point, a closed figure is created either by joining the endpoints with a straight line or by using the intersection point of the beginning and ending line segments, whichever is more appropriate. Only the first stroke is used; if the pen data has more than a single stroke, subsequent strokes are ignored.

Return Value
This function returns a handle to a region if successful; otherwise the return value is NULL.

Comments
The coordinates of the region are the same as those used in the pen data. It is the application's responsibility to remove the region when the application is finished with it, using the Windows DeleteObject function.

CreatePenDataRegion enables an application to determine the screen area a gesture such as lasso or cut applies to. For an example of how to use the CreatePenDataRegion function to determine the area of a gesture, see the section "DoDefaultPenInput Messages" in Chapter 2, "Starting Out with System Defaults."

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