Region class (gdiplusheaders.h)

The Region class describes an area of the display surface. The area can be any shape. In other words, the boundary of the area can be a combination of curved and straight lines. Regions can also be created from the interiors of rectangles, paths, or a combination of these. Regions are used in clipping and hit-testing operations.

Inheritance

The Region class implements GdiplusBase.

Methods

The Region class has these methods.

Region::Clone The Region::Clone method makes a copy of this Regionobject and returns the address of the new Regionobject.
Region::Complement The Region::Complement method updates this region to the portion of the specified path's interior that does not intersect this region.
Region::Complement The Region::Complement method updates a region that does not intersect this region.
Region::Complement The Region::Complement method updates this region to the portion of the specified rectangle's interior that does not intersect this region.
Region::Complement The Region::Complement method updates this region to the portion of another region that does not intersect this region.
Region::Equals The Region::Equals method determines whether this region is equal to a specified region.
Region::Exclude The Region::Exclude method updates this region to the portion of itself that does not intersect the specified path's interior.
Region::Exclude The Region::Exclude method updates a region that does not intersect the specified rectangle's interior.
Region::Exclude The Region::Exclude method updates this region to the portion of itself that does not intersect the specified rectangle's interior.
Region::Exclude The Region::Exclude method updates this region to the portion of itself that does not intersect another region.
Region::FromHRGN The Region::FromHRGN method creates a Windows GDI+Region object from a Windows Graphics Device Interface (GDI)  region.
Region::GetBounds The Region::GetBounds method gets a rectangle that encloses this region. (overload 2/2)
Region::GetBounds The Region::GetBounds method gets a rectangle that encloses this region. (overload 1/2)
Region::GetData The Region::GetData method gets data that describes this region.
Region::GetDataSize The Region::GetDataSize method gets the number of bytes of data that describes this region.
Region::GetHRGN The Region::GetHRGN method creates a Windows Graphics Device Interface (GDI) region from this region.
Region::GetLastStatus The Region::GetLastStatus method returns a value that indicates the nature of this Regionobject's most recent method failure.
Region::GetRegionScans The Region::GetRegionScans method gets an array of rectangles that approximate this region. The region is transformed by a specified matrix before the rectangles are calculated.
Region::GetRegionScans The Region::GetRegionScans method gets an array of rectangles that approximate this region.
Region::GetRegionScansCount The Region::GetRegionScansCount method gets the number of rectangles that approximate this region. The region is transformed by a specified matrix before the rectangles are calculated.
Region::Intersect The Region::Intersect method updates this region to the portion of itself that intersects the specified path's interior.
Region::Intersect The Region::Intersect method updates a region intersects the specified rectangle's interior.
Region::Intersect The Region::Intersect method updates this region to the portion of itself that intersects the specified rectangle's interior.
Region::Intersect The Region::Intersect method updates this region to the portion of itself that intersects another region.
Region::IsEmpty The Region::IsEmpty method determines whether this region is empty.
Region::IsInfinite The Region::IsInfinite method determines whether this region is infinite.
Region::IsVisible The Region::IsVisible method determines whether a point is inside this region. (overload 1/4)
Region::IsVisible The Region::IsVisible method determines whether a point is inside this region. (overload 4/4)
Region::IsVisible The Region::IsVisible method determines whether a rectangle intersects this region. (overload 2/4)
Region::IsVisible The Region::IsVisible method determines whether a rectangle intersects this region. (overload 4/4)
Region::IsVisible The Region::IsVisible method determines whether a point is inside this region. (overload 2/4)
Region::IsVisible The Region::IsVisible method determines whether a rectangle intersects this region. (overload 3/4)
Region::IsVisible The Region::IsVisible method determines whether a point is inside this region. (overload 3/4)
Region::IsVisible The Region::IsVisible method determines whether a rectangle intersects this region. (overload 1/4)
Region::MakeEmpty The Region::MakeEmpty method updates this region to an empty region. In other words, the region occupies no space on the display device.
Region::MakeInfinite The Region::MakeInfinite method updates this region to an infinite region.
Region::Region Creates a region that is infinite. This is the default constructor. (Region.Region)
Region::Region Creates a region that is defined by data obtained from another region.
Region::Region Creates a region that is defined by a path (a GraphicsPath object) and has a fill mode that is contained in the GraphicsPath object.
Region::Region Creates a region that is defined by a rectangle. (overload 1/2)
Region::Region Creates a region that is defined by a rectangle. (overload 2/2)
Region::Region Creates a region that is infinite. This is the default constructor. (overload 2/3)
Region::Region Creates a region that is infinite. This is the default constructor. (overload 1/3)
Region::Region Creates a region that is identical to the region that is specified by a handle to a Windows Graphics Device Interface (GDI) region.
Region::Transform The Region::Transform method transforms this region by multiplying each of its data points by a specified matrix.
Region::Translate The Region::Translate method offsets this region by specified amounts in the horizontal and vertical directions. (overload 1/2)
Region::Translate The Region::Translate method offsets this region by specified amounts in the horizontal and vertical directions. (overload 2/2)
Region::Union The Region::Union method updates this region to all portions (intersecting and nonintersecting) of itself and all portions of the specified path's interior.
Region::Union The Region::Union method updates this region.
Region::Union The Region::Union method updates this region to all portions (intersecting and nonintersecting) of itself and all portions of the specified rectangle's interior.
Region::Union The Region::Union method updates this region to all portions (intersecting and nonintersecting) of itself and all portions of another region.
Region::Xor The Region::Xor method updates this region to the nonintersecting portions of itself and the specified path's interior.
Region::Xor The Region::Xor method updates a region to the nonintersecting portions with a rectangle's interior.
Region::Xor The Region::Xor method updates this region to the nonintersecting portions of itself and the specified rectangle's interior.
Region::Xor The Region::Xor method updates this region to the nonintersecting portions of itself and another region.

Remarks

A GDI+ region is stored in world coordinates whereas a GDI region is stored in device coordinates. Therefore, a GDI+ region is scalable and a GDI region is not. For more information, see the Scalable Regions section in New Features.

An application can use regions to clip the output of drawing operations. The Window Manager uses regions to define the drawing area of windows. These regions are called clipping regions. An application can also use regions in hit-testing operations, such as checking whether a point is in a region or whether a rectangle intersects a region. For more information, see Regions, Clipping, and Using Regions.

Requirements

Requirement	Value
Target Platform	Windows
Header	gdiplusheaders.h