cc81d32f2b
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18805 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
317 lines
8.6 KiB
TeX
317 lines
8.6 KiB
TeX
\section{\class{wxRegion}}\label{wxregion}
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A wxRegion represents a simple or complex region on a device context or window. It uses
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reference counting, so copying and assignment operations are fast.
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\wxheading{Derived from}
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\helpref{wxGDIObject}{wxgdiobject}\\
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/region.h>
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\wxheading{See also}
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\helpref{wxRegionIterator}{wxregioniterator}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxRegion::wxRegion}\label{wxregionconstr}
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\func{}{wxRegion}{\void}
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Default constructor.
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\func{}{wxRegion}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
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Constructs a rectangular region with the given position and size.
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\func{}{wxRegion}{\param{const wxPoint\&}{ topLeft}, \param{const wxPoint\&}{ bottomRight}}
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Constructs a rectangular region from the top left point and the bottom right point.
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\func{}{wxRegion}{\param{const wxRect\&}{ rect}}
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Constructs a rectangular region a wxRect object.
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\func{}{wxRegion}{\param{const wxRegion\&}{ region}}
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Constructs a region by copying another region.
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\func{}{wxRegion}{\param{size\_t}{ n}, \param{const wxPoint }{*points}, \param{int }{fillStyle = wxWINDING\_RULE}}
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Constructs a region corresponding to the polygon made of {\it n} points in the
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provided array. {\it fillStyle} parameter may have values
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{\tt wxWINDING\_RULE} or {\tt wxODDEVEN\_RULE}.
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{\bf NB:} This constructor is only implemented for Win32 and GTK+ wxWindows ports.
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\membersection{wxRegion::\destruct{wxRegion}}
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\func{}{\destruct{wxRegion}}{\void}
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Destructor.
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\membersection{wxRegion::Clear}\label{wxregionclear}
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\func{void}{Clear}{\void}
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Clears the current region.
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\membersection{wxRegion::Contains}\label{wxregioncontains}
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\constfunc{wxRegionContain}{Contains}{\param{long\& }{x}, \param{long\& }{y}}
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Returns a value indicating whether the given point is contained within the region.
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\constfunc{wxRegionContain}{Contains}{\param{const wxPoint\&}{ pt}}
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Returns a value indicating whether the given point is contained within the region.
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\constfunc{wxRegionContain}{Contains}{\param{long\& }{x}, \param{long\& }{y}, \param{long\& }{width}, \param{long\& }{height}}
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Returns a value indicating whether the given rectangle is contained within the region.
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\constfunc{wxRegionContain}{Contains}{\param{const wxRect\& }{rect}}
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Returns a value indicating whether the given rectangle is contained within the region.
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\wxheading{Return value}
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The return value is one of wxOutRegion, wxPartRegion and wxInRegion.
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On Windows, only wxOutRegion and wxInRegion are returned; a value wxInRegion then indicates that
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all or some part of the region is contained in this region.
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\membersection{wxRegion::GetBox}\label{wxregiongetbox}
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\constfunc{void}{GetBox}{\param{long\& }{x}, \param{long\& }{y}, \param{long\& }{width}, \param{long\& }{height}}
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Returns the outer bounds of the region.
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\constfunc{wxRect}{GetBox}{\void}
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Returns the outer bounds of the region.
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\membersection{wxRegion::Intersect}\label{wxregionintersect}
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\func{bool}{Intersect}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
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Finds the intersection of this region and another, rectangular region, specified using position and size.
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\func{bool}{Intersect}{\param{const wxRect\&}{ rect}}
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Finds the intersection of this region and another, rectangular region.
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\func{bool}{Intersect}{\param{const wxRegion\&}{ region}}
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Finds the intersection of this region and another region.
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\wxheading{Return value}
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{\tt true} if successful, {\tt false} otherwise.
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\wxheading{Remarks}
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Creates the intersection of the two regions, that is, the parts which are in both regions. The result
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is stored in this region.
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\membersection{wxRegion::IsEmpty}\label{wxregionisempty}
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\constfunc{bool}{IsEmpty}{\void}
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Returns {\tt true} if the region is empty, {\tt false} otherwise.
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\membersection{wxRegion::Subtract}\label{wxregionsubstract}
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\func{bool}{Subtract}{\param{const wxRect\&}{ rect}}
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Subtracts a rectangular region from this region.
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\func{bool}{Subtract}{\param{const wxRegion\&}{ region}}
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Subtracts a region from this region.
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\wxheading{Return value}
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{\tt true} if successful, {\tt false} otherwise.
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\wxheading{Remarks}
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This operation combines the parts of 'this' region that are not part of the second region.
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The result is stored in this region.
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\membersection{wxRegion::Offset}\label{wxregionoffset}
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\func{bool}{Offset}{\param{wxCoord}{ x}, \param{wxCoord}{ y}}
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Moves the region by the specified offsets in horizontal and vertical
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directions.
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\wxheading{Return value}
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{\tt true} if successful, {\tt false} otherwise (the region is unchanged then).
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\membersection{wxRegion::Union}\label{wxregionunion}
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\func{bool}{Union}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
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Finds the union of this region and another, rectangular region, specified using position and size.
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\func{bool}{Union}{\param{const wxRect\&}{ rect}}
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Finds the union of this region and another, rectangular region.
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\func{bool}{Union}{\param{const wxRegion\&}{ region}}
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Finds the union of this region and another region.
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\wxheading{Return value}
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{\tt true} if successful, {\tt false} otherwise.
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\wxheading{Remarks}
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This operation creates a region that combines all of this region and the second region.
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The result is stored in this region.
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\membersection{wxRegion::Xor}\label{wxregionxor}
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\func{bool}{Xor}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
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Finds the Xor of this region and another, rectangular region, specified using position and size.
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\func{bool}{Xor}{\param{const wxRect\&}{ rect}}
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Finds the Xor of this region and another, rectangular region.
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\func{bool}{Xor}{\param{const wxRegion\&}{ region}}
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Finds the Xor of this region and another region.
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\wxheading{Return value}
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{\tt true} if successful, {\tt false} otherwise.
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\wxheading{Remarks}
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This operation creates a region that combines all of this region and the second region, except
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for any overlapping areas. The result is stored in this region.
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\membersection{wxRegion::operator $=$}\label{wxregionassign}
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\func{void}{operator $=$}{\param{const wxRegion\&}{ region}}
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Copies {\it region} by reference counting.
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\section{\class{wxRegionIterator}}\label{wxregioniterator}
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This class is used to iterate through the rectangles in a region,
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typically when examining the damaged regions of a window within an OnPaint call.
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To use it, construct an iterator object on the stack and loop through the
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regions, testing the object and incrementing the iterator at the end of the loop.
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See \helpref{wxPaintEvent}{wxpaintevent} for an example of use.
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\wxheading{Derived from}
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\helpref{wxObject}{wxobject}
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\wxheading{Include files}
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<wx/region.h>
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\wxheading{See also}
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\helpref{wxPaintEvent}{wxpaintevent}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxRegionIterator::wxRegionIterator}
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\func{}{wxRegionIterator}{\void}
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Default constructor.
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\func{}{wxRegionIterator}{\param{const wxRegion\&}{ region}}
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Creates an iterator object given a region.
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\membersection{wxRegionIterator::GetX}
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\constfunc{wxCoord}{GetX}{\void}
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Returns the x value for the current region.
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\membersection{wxRegionIterator::GetY}
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\constfunc{wxCoord}{GetY}{\void}
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Returns the y value for the current region.
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\membersection{wxRegionIterator::GetW}
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\constfunc{wxCoord}{GetW}{\void}
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An alias for GetWidth.
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\membersection{wxRegionIterator::GetWidth}
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\constfunc{wxCoord}{GetWidth}{\void}
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Returns the width value for the current region.
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\membersection{wxRegionIterator::GetH}
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\constfunc{wxCoord}{GetH}{\void}
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An alias for GetHeight.
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\membersection{wxRegionIterator::GetHeight}
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\constfunc{wxCoord}{GetWidth}{\void}
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Returns the width value for the current region.
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\membersection{wxRegionIterator::GetRect}
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\constfunc{wxRect}{GetRect}{\void}
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Returns the current rectangle.
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\membersection{wxRegionIterator::HaveRects}
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\constfunc{bool}{HaveRects}{\void}
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Returns {\tt true} if there are still some rectangles; otherwise returns {\tt false}.
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\membersection{wxRegionIterator::Reset}
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\func{void}{Reset}{\void}
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Resets the iterator to the beginning of the rectangles.
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\func{void}{Reset}{\param{const wxRegion\&}{ region}}
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Resets the iterator to the given region.
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\membersection{wxRegionIterator::operator $++$}
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\func{void}{operator $++$}{\void}
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Increment operator. Increments the iterator to the next region.
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\pythonnote{A wxPython alias for this operator is called {\tt Next}.}
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\membersection{wxRegionIterator::operator bool}
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\constfunc{}{operator bool}{\void}
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Returns {\tt true} if there are still some rectangles; otherwise returns {\tt false}.
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You can use this to test the iterator object as if it were of type bool.
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