Derived types of wxDC have documentation for specific features
only, so refer to this section for most device context information.
+% VZ: we should really document them instead of this lame excuse, but I don't
+% have time for it now, when it is done please remove this
+Please note that in addition to the versions of the methods documented here,
+there are also versions which accept single {\tt wxPoint} parameter instead of
+two {\tt wxCoord} ones or {\tt wxPoint} and {\tt wxSize} instead of four of
+them.
+
\wxheading{Derived from}
\helpref{wxObject}{wxobject}
\func{bool}{Blit}{\param{wxCoord}{ xdest}, \param{wxCoord}{ ydest}, \param{wxCoord}{ width}, \param{wxCoord}{ height},
\param{wxDC* }{source}, \param{wxCoord}{ xsrc}, \param{wxCoord}{ ysrc}, \param{int}{ logicalFunc = wxCOPY},
- \param{bool }{useMask = FALSE}}
+ \param{bool }{useMask = FALSE}, \param{wxCoord}{ xsrcMask = -1}, \param{wxCoord}{ ysrcMask = -1}}
Copy from a source DC to this DC, specifying the destination
-coordinates, size of area to copy, source DC, source coordinates, and
-logical function.
+coordinates, size of area to copy, source DC, source coordinates,
+logical function, whether to use a bitmap mask, and mask source position.
\wxheading{Parameters}
\docparam{logicalFunc}{Logical function to use: see \helpref{wxDC::SetLogicalFunction}{wxdcsetlogicalfunction}.}
\docparam{useMask}{If TRUE, Blit does a transparent blit using the mask that is associated with the bitmap
-selected into the source device context. The Windows implementation does the following:
+selected into the source device context. The Windows implementation does the following if MaskBlt cannot be used:
\begin{enumerate}
\item Creates a temporary bitmap and copies the destination area into it.
This sequence of operations ensures that the source's transparent area need not be black,
and logical functions are supported.
+
+{\bf Note:} on Windows, blitting with masks can be speeded up considerably by compiling
+wxWindows with the wxUSE\_DC\_CACHE option enabled. You can also influence whether MaskBlt
+or the explicit mask blitting code above is used, by using \helpref{wxSystemOptions}{wxsystemoptions} and
+setting the {\bf no-maskblt} option to 1.
+
}
+\docparam{xsrcMask}{Source x position on the mask. If both xsrcMask and ysrcMask are -1, xsrc and ysrc
+will be assumed for the mask source position. Currently only implemented on Windows.}
+
+\docparam{ysrcMask}{Source y position on the mask. If both xsrcMask and ysrcMask are -1, xsrc and ysrc
+will be assumed for the mask source position. Currently only implemented on Windows.}
+
+
\wxheading{Remarks}
There is partial support for Blit in wxPostScriptDC, under X.
\helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask}
+\begin{comment}
+\membersection{wxDC::CacheEnabled}\label{wxdccacheenabled}
+
+\func{static bool}{CacheEnabled}{\void}
+
+On supported platforms (currently only Windows), returns TRUE
+if the DC cache is enabled. The DC cache
+can speed up the \helpref{Blit}{wxdcblit} operation when
+drawing a large number of masked bitmaps.
+
+If using the cache functions in your code, please test for the
+wxUSE\_DC\_CACHEING preprocessor symbol for portability.
+
+\wxheading{See also}
+
+\helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::ClearCache}
+\end{comment}
+
\membersection{wxDC::CalcBoundingBox}\label{wxdccalcboundingbox}
\func{void}{CalcBoundingBox}{\param{wxCoord }{x}, \param{wxCoord }{y}}
Clears the device context using the current background brush.
+\begin{comment}
+\membersection{wxDC::ClearCache}\label{wxdcclearcache}
+
+\func{static void}{ClearCache}{\void}
+
+On supported platforms (currently only Windows), clears
+the contents of the DC cache (one bitmap and two Windows device contexts). The DC cache
+can speed up the \helpref{Blit}{wxdcblit} operation when
+drawing a large number of masked bitmaps. You should
+call ClearCache at the end of length DC operations if you wish to only use
+the cache transiently; you should also call it as your application exits.
+
+If using the cache functions in your code, please test for the
+wxUSE\_DC\_CACHEING preprocessor symbol for portability.
+
+\wxheading{See also}
+
+\helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::CacheEnabled}
+\end{comment}
+
\membersection{wxDC::CrossHair}\label{wxdccrosshair}
\func{void}{CrossHair}{\param{wxCoord}{ x}, \param{wxCoord}{ y}}
\param{double}{ start}, \param{double}{ end}}
Draws an arc of an ellipse. The current pen is used for drawing the arc and
-the current brush is used for drawing the pie. This function is currently only available for
-X window and PostScript device contexts.
+the current brush is used for drawing the pie.
{\it x} and {\it y} specify the x and y coordinates of the upper-left corner of the rectangle that contains
the ellipse.
\pythonnote{The wxPython version of this method accepts a Python list
of wxPoint objects.}
+\perlnote{The wxPerl version of this method accepts
+ as its first parameter a reference to an array
+ of wxPoint objects.}
+
\membersection{wxDC::DrawPolygon}\label{wxdcdrawpolygon}
\func{void}{DrawPolygon}{\param{int}{ n}, \param{wxPoint}{ points[]}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0},\\
\pythonnote{The wxPython version of this method accepts a Python list
of wxPoint objects.}
+\perlnote{The wxPerl version of this method accepts
+ as its first parameter a reference to an array
+ of wxPoint objects.}
+
\membersection{wxDC::DrawPoint}\label{wxdcdrawpoint}
\func{void}{DrawPoint}{\param{wxCoord}{ x}, \param{wxCoord}{ y}}
Draws the text rotated by {\it angle} degrees.
+{\bf NB:} Under Win9x only TrueType fonts can be drawn by this function. In
+particular, a font different from {\tt wxNORMAL\_FONT} should be used as the
+latter is not a TrueType font. {\tt wxSWISS\_FONT} is an example of a font
+which is.
+
\wxheading{See also}
\helpref{DrawText}{wxdcdrawtext}
\pythonnote{The wxPython version of this method accepts a Python list
of wxPoint objects.}
+\perlnote{The wxPerl version of this method accepts a reference to an array
+ of wxPoint objects.}
+
\membersection{wxDC::DrawText}\label{wxdcdrawtext}
\func{void}{DrawText}{\param{const wxString\& }{text}, \param{wxCoord}{ x}, \param{wxCoord}{ y}}
but it is ignored by wxMSW. Thus, you should avoid using logical functions
with this function in portable programs.
+\begin{comment}
+\membersection{wxDC::EnableCache}\label{wxdcenablecache}
+
+\func{static void}{EnableCache}{\param{bool}{ enableCache}}
+
+On supported platforms (currently only Windows), enables the DC cache
+which can speed up the \helpref{Blit}{wxdcblit} operation when
+drawing a large number of masked bitmaps.
+
+If using the cache functions in your code, please test for the
+wxUSE\_DC\_CACHEING preprocessor symbol for portability.
+
+\wxheading{See also}
+
+\helpref{wxDC::CacheEnabled}{wxdccacheenabled}, \helpref{wxDC::ClearCache}
+\end{comment}
+
\membersection{wxDC::EndDoc}\label{wxdcenddoc}
\func{void}{EndDoc}{\void}
\pythonnote{No arguments are required and the four values defining the
rectangle are returned as a tuple.}
+\perlnote{This method takes no arguments and returns a four element list
+{\tt ( \$x, \$y, \$width, \$height )}}
+
\membersection{wxDC::GetFont}\label{wxdcgetfont}
\func{wxFont\&}{GetFont}{\void}
\pythonnote{For wxPython the wxColour value is returned and is not
required as a parameter.}
+\perlnote{This method only takes the parameters {\tt x} and {\tt y} and returns
+a Wx::Colour value}
+
\membersection{wxDC::GetSize}\label{wxdcgetsize}
\func{void}{GetSize}{\param{wxCoord *}{width}, \param{wxCoord *}{height}}
\end{twocollist}}
}
+\perlnote{In place of a single overloaded method, wxPerl uses:\par
+\indented{2cm}{\begin{twocollist}
+\twocolitem{{\bf GetSize()}}{Returns a Wx::Size}
+\twocolitem{{\bf GetSizeWH()}}{Returns a 2-element list
+ {\tt ( \$width, \$height )}}
+\end{twocollist}
+}}
+
\membersection{wxDC::GetTextBackground}\label{wxdcgettextbackground}
\func{wxColour\&}{GetTextBackground}{\void}
\end{twocollist}}
}
+\perlnote{In wxPerl this method is implemented as
+ {\bf GetTextExtent( string, font = undef )} returning a four element
+ array {\tt ( \$width, \$height, \$descent, \$externalLeading )}
+}
+
\membersection{wxDC::GetTextForeground}\label{wxdcgettextforeground}
\func{wxColour\&}{GetTextForeground}{\void}
Gets the current user scale factor (set by \helpref{SetUserScale}{wxdcsetuserscale}).
+\perlnote{In wxPerl this method takes no arguments and returna a two element
+ array {\tt ( \$x, \$y )}}
\membersection{wxDC::LogicalToDeviceX}\label{wxdclogicaltodevicex}
Starts a document page (only relevant when outputting to a printer).
+\section{\class{wxDCClipper}}\label{wxdcclipper}
+
+This is a small helper class which sets the specified to its constructor
+clipping region and then automatically destroyes it in its destructor. Using
+it ensures that unwanted clipping region is not left set on the DC.
+
+\wxheading{Derived from}
+
+No base class
+
+\wxheading{Include files}
+
+<wx/dc.h>
+
+\wxheading{See also}
+
+\helpref{wxDC}{wxdc}
+
+\latexignore{\rtfignore{\wxheading{Members}}}
+
+\membersection{wxDCClipper::wxDCClipper}
+
+\func{}{wxDCClipper}{\param{wxDC\& }{dc}, \param{wxCoord }{x},\param{wxCoord }{y},\param{wxCoord }{w},\param{wxCoord }{h},}
+
+\func{}{wxDCClipper}{\param{wxDC\& }{dc}, \param{const wxRect\&}{ rect}}
+
+Constructor: sets the the clipping region for the given device context to the
+specified rectangle.
+
+\membersection{wxDCClipper::\destruct{wxDCClipper}}
+
+\func{}{\destruct{wxDCClipper}}{\void}
+
+Destructor: destroyes the clipping region set in the constructor.
+
projects / wxWidgets.git / blobdiff