Microsoft Foundation Classes (mfc.hlp) (Table of Contents; Topic list)
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class CRgn
◄CGdiObject►                                  ◄Up► ◄Contents► ◄Index► ◄Back►
──Microsoft Foundation Classes──────────────────────────────────────────────
 
  Description
 
  The CRgn class encapsulates a Windows graphical design interface (GDI)
  region. A region is an elliptical or polygonal area within a window. To
  use regions, you use the member functions of class CRgn in conjunction
  with the clipping functions defined as members of class CDC.
 
  The member functions of CRgn create, alter, and retrieve information
  about the region object for which they are called.
 
  Public Members
 
  Construction/Destruction
 
  ◄CRgn►   Constructs a CRgn object.
 
  Initialization
 
  ◄CreateRectRgn►               Initializes a CRgn object with a
                                rectangular region.
 
  ◄CreateRectRgnIndirect►       Initializes a CRgn object with a
                                rectangular region defined by a ◄RECT►
                                structure.
 
  ◄CreateEllipticRgn►           Initializes a CRgn object with an
                                elliptical region.
 
  ◄CreateEllipticRgnIndirect►   Initializes a CRgn object with an
                                elliptical region defined by a ◄RECT►
                                structure.
 
  ◄CreatePolygonRgn►            Initializes a CRgn object with a polygonal
                                region. The system closes the polygon
                                automatically, if necessary, by drawing a
                                line from the last vertex to the first.
 
  ◄CreatePolyPolygonRgn►        Initializes a CRgn object with a region
                                consisting of a series of closed polygons.
                                The polygons may be disjoint or they may
                                overlap.
 
  ◄CreateRoundRectRgn►          Initializes a CRgn object with a
                                rectangular region with rounded corners.
 
  ◄CombineRgn►                  Initialize a CRgn object so that it is
                                equivalent to the union of two specified
                                CRgn objects.
 
  ◄CopyRgn►                     Initializes a CRgn object so that it is a
                                copy of a specified CRgn object.
 
  Operations
 
  ◄EqualRgn►       Checks two CRgn objects to determine whether they are
                   equivalent.
 
  ◄FromHandle►     Returns a pointer to a CRgn object when given a handle
                   to a Windows region.
 
  ◄GetRgnBox►      Retrieves the coordinates of the bounding rectangle of
                   a CRgn object.
 
  ◄OffsetRgn►      Moves a CRgn object by the specified offsets.
 
  ◄PtInRegion►     Determines whether a specified point is in the region.
 
  ◄RectInRegion►   Determines whether any part of a specified rectangle is
                   within the boundaries of the region.
 
  ◄SetRectRgn►     Sets the CRgn object to the specified rectangular
                   region.
 
 
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