X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b7cacb43db1e69b87b257a67912b4d52995b070a..9c57566224918b8a121d1011aa7baa5b28b334a6:/docs/latex/wx/dc.tex diff --git a/docs/latex/wx/dc.tex b/docs/latex/wx/dc.tex index cbfb91daee..cffeac284a 100644 --- a/docs/latex/wx/dc.tex +++ b/docs/latex/wx/dc.tex @@ -108,7 +108,7 @@ See \helpref{wxMemoryDC}{wxmemorydc} for typical usage. \wxheading{See also} -\helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask} +\helpref{wxDC::StretchBlit}{wxdcstretchblit}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask} \begin{comment} @@ -634,6 +634,20 @@ initially and only after calling \helpref{wxDC::SetFont}{wxdcsetfont} a valid font is returned. +\membersection{wxDC::GetLayoutDirection}\label{wxdcgetlayoutdirection} + +\constfunc{wxLayoutDirection}{GetLayoutDirection}{\void} + +Gets the current layout direction of the device context. On platforms where RTL layout +is supported, the return value will either be \texttt{wxLayout\_LeftToRight} or +\texttt{wxLayout\_RightToLeft}. If RTL layout is not supported, the return value will +be \texttt{wxLayout\_Default}. + +\wxheading{See also} + +\helpref{SetLayoutDirection}{wxdcsetlayoutdirection} + + \membersection{wxDC::GetLogicalFunction}\label{wxdcgetlogicalfunction} \func{int}{GetLogicalFunction}{\void} @@ -648,6 +662,33 @@ Gets the current logical function (see \helpref{wxDC::SetLogicalFunction}{wxdcse Gets the {\it mapping mode} for the device context (see \helpref{wxDC::SetMapMode}{wxdcsetmapmode}). +\membersection{wxDC::GetMultiLineTextExtent}\label{wxdcgetmultilinetextextent} + +\constfunc{void}{GetMultiLineTextExtent}{\param{const wxString\& }{string}, \param{wxCoord *}{w},\\ + \param{wxCoord *}{h}, \param{wxCoord *}{heightLine = NULL}, \param{wxFont *}{font = NULL}} + +\constfunc{wxSize}{GetMultiLineTextExtent}{\param{const wxString\& }{string}} + +Gets the dimensions of the string using the currently selected font. +\rtfsp{\it string} is the text string to measure, {\it heightLine}, if non NULL, +is where to store the height of a single line. + +The text extent is returned in {\it w} and {\it h} pointers (first form) or as +a \helpref{wxSize}{wxsize} object (second form). + +If the optional parameter {\it font} is specified and valid, then it is used +for the text extent calculation. Otherwise the currently selected font is. + +Note that this function works both with single-line and multi-line strings. + +\wxheading{See also} + +\helpref{wxFont}{wxfont},\rtfsp +\helpref{wxDC::SetFont}{wxdcsetfont},\rtfsp +\helpref{wxDC::GetPartialTextExtents}{wxdcgetpartialtextextents},\rtfsp +\helpref{wxDC::GetTextExtent}{wxdcgettextextent} + + \membersection{wxDC::GetPartialTextExtents}\label{wxdcgetpartialtextextents} \constfunc{bool}{GetPartialTextExtents}{\param{const wxString\& }{text}, @@ -661,6 +702,11 @@ various platforms have a native API function that is faster or more accurate than the generic implementation then it should be used instead. +\wxheading{See also} + +\helpref{wxDC::GetMultiLineTextExtent}{wxdcgetmultilinetextextent},\rtfsp +\helpref{wxDC::GetTextExtent}{wxdcgettextextent} + \pythonnote{This method only takes the {\it text} parameter and returns a Python list of integers.} @@ -746,20 +792,31 @@ Gets the current text background colour (see \helpref{wxDC::SetTextBackground}{w \membersection{wxDC::GetTextExtent}\label{wxdcgettextextent} -\func{void}{GetTextExtent}{\param{const wxString\& }{string}, \param{wxCoord *}{w}, \param{wxCoord *}{h},\\ +\constfunc{void}{GetTextExtent}{\param{const wxString\& }{string}, \param{wxCoord *}{w}, \param{wxCoord *}{h},\\ \param{wxCoord *}{descent = NULL}, \param{wxCoord *}{externalLeading = NULL}, \param{wxFont *}{font = NULL}} +\constfunc{wxSize}{GetTextExtent}{\param{const wxString\& }{string}} + Gets the dimensions of the string using the currently selected font. -\rtfsp{\it string} is the text string to measure, {\it w} and {\it h} are -the total width and height respectively, {\it descent} is the +\rtfsp{\it string} is the text string to measure, {\it descent} is the dimension from the baseline of the font to the bottom of the descender, and {\it externalLeading} is any extra vertical space added to the font by the font designer (usually is zero). +The text extent is returned in {\it w} and {\it h} pointers (first form) or as +a \helpref{wxSize}{wxsize} object (second form). + If the optional parameter {\it font} is specified and valid, then it is used for the text extent calculation. Otherwise the currently selected font is. -See also \helpref{wxFont}{wxfont}, \helpref{wxDC::SetFont}{wxdcsetfont}. +Note that this function only works with single-line strings. + +\wxheading{See also} + +\helpref{wxFont}{wxfont},\rtfsp +\helpref{wxDC::SetFont}{wxdcsetfont},\rtfsp +\helpref{wxDC::GetPartialTextExtents}{wxdcgetpartialtextextents},\rtfsp +\helpref{wxDC::GetMultiLineTextExtent}{wxdcgetmultilinetextextent} \pythonnote{The following methods are implemented in wxPython:\par \indented{2cm}{\begin{twocollist} @@ -942,7 +999,7 @@ whether text will be drawn with a background colour or not. Sets the current brush for the DC. If the argument is wxNullBrush, the current brush is selected out of the device -context, and the original brush restored, allowing the current brush to +context (leaving wxDC without any valid brush), allowing the current brush to be destroyed safely. See also \helpref{wxBrush}{wxbrush}. @@ -997,6 +1054,18 @@ should not pass {\tt wxNullFont} to this method. See also \helpref{wxFont}{wxfont}. +\membersection{wxDC::SetLayoutDirection}\label{wxdcsetlayoutdirection} + +\func{void}{SetLayoutDirection}{\param{wxLayoutDirection}{ dir}} + +Sets the current layout direction for the device context. \arg{dir} may be either +\texttt{wxLayout\_Default}, \texttt{wxLayout\_LeftToRight} or \texttt{wxLayout\_RightToLeft}. + +\wxheading{See also} + +\helpref{GetLayoutDirection}{wxdcgetlayoutdirection} + + \membersection{wxDC::SetLogicalFunction}\label{wxdcsetlogicalfunction} \func{void}{SetLogicalFunction}{\param{int}{ function}} @@ -1083,7 +1152,8 @@ See \helpref{wxPalette}{wxpalette} for further details. Sets the current pen for the DC. If the argument is wxNullPen, the current pen is selected out of the device -context, and the original pen restored. +context (leaving wxDC without any valid pen), allowing the current brush to +be destroyed safely. See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours when drawing into a monochrome bitmap. @@ -1127,3 +1197,85 @@ Message is a message to show while printing. \func{bool}{StartPage}{\void} Starts a document page (only relevant when outputting to a printer). + + +\membersection{wxDC::StretchBlit}\label{wxdcstretchblit} + +\func{bool}{StretchBlit}{\param{wxCoord}{ xdest}, \param{wxCoord}{ ydest}, \param{wxCoord}{ dstWidth}, \param{wxCoord}{ dstHeight}, + \param{wxDC* }{source}, \param{wxCoord}{ xsrc}, \param{wxCoord}{ ysrc}, \param{wxCoord}{ srcWidth}, \param{wxCoord}{ srcHeight}, + \param{int}{ logicalFunc = wxCOPY}, \param{bool }{useMask = false}, \param{wxCoord}{ xsrcMask = -1}, \param{wxCoord}{ ysrcMask = -1}} + +Copy from a source DC to this DC, specifying the destination +coordinates, destination size, source DC, source coordinates, +size of source area to copy, logical function, whether to use a bitmap mask, +and mask source position. + +\wxheading{Parameters} + +\docparam{xdest}{Destination device context x position.} + +\docparam{ydest}{Destination device context y position.} + +\docparam{dstWidth}{Width of destination area.} + +\docparam{dstHeight}{Height of destination area.} + +\docparam{source}{Source device context.} + +\docparam{xsrc}{Source device context x position.} + +\docparam{ysrc}{Source device context y position.} + +\docparam{srcWidth}{Width of source area to be copied.} + +\docparam{srcHeight}{Height of source area to be copied.} + +\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 if \texttt{MaskBlt} cannot be used: + +\begin{enumerate} +\item Creates a temporary bitmap and copies the destination area into it. +\item Copies the source area into the temporary bitmap using the specified logical function. +\item Sets the masked area in the temporary bitmap to BLACK by ANDing the +mask bitmap with the temp bitmap with the foreground colour set to WHITE +and the background colour set to BLACK. +\item Sets the unmasked area in the destination area to BLACK by ANDing the +mask bitmap with the destination area with the foreground colour set to BLACK +and the background colour set to WHITE. +\item ORs the temporary bitmap with the destination area. +\item Deletes the temporary bitmap. +\end{enumerate} + +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 +wxWidgets with the \texttt{wxUSE\_DC\_CACHE} option enabled. You can also influence whether \texttt{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. + +wxDC::StretchBlit is only implemented under wxMAC and wxMSW. + +See \helpref{wxMemoryDC}{wxmemorydc} for typical usage. + +\newsince{2.9.0} + +\wxheading{See also} + +\helpref{wxDC::Blit}{wxdcblit}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask} +