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 using
-\helpref{DC cacheing}{wxdcenablecache}. You can also influence whether MaskBlt
+{\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.
\helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask}
+\begin{comment}
\membersection{wxDC::CacheEnabled}\label{wxdccacheenabled}
\func{static bool}{CacheEnabled}{\void}
\wxheading{See also}
\helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::ClearCache}
+\end{comment}
\membersection{wxDC::CalcBoundingBox}\label{wxdccalcboundingbox}
Clears the device context using the current background brush.
+\begin{comment}
\membersection{wxDC::ClearCache}\label{wxdcclearcache}
\func{static void}{ClearCache}{\void}
\wxheading{See also}
\helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::CacheEnabled}
+\end{comment}
\membersection{wxDC::CrossHair}\label{wxdccrosshair}
\func{wxCoord}{DeviceToLogicalXRel}{\param{wxCoord}{ x}}
Convert device X coordinate to relative logical coordinate, using the current
-mapping mode. Use this function for converting a width, for example.
+mapping mode but ignoring the x axis orientation.
+Use this function for converting a width, for example.
\membersection{wxDC::DeviceToLogicalY}\label{wxdcdevicetologicaly}
\func{wxCoord}{DeviceToLogicalYRel}{\param{wxCoord}{ y}}
Convert device Y coordinate to relative logical coordinate, using the current
-mapping mode. Use this function for converting a height, for example.
+mapping mode but ignoring the y axis orientation.
+Use this function for converting a height, for example.
\membersection{wxDC::DrawArc}\label{wxdcdrawarc}
Draws a check mark inside the given rectangle.
+\membersection{wxDC::DrawCircle}\label{wxdcdrawcircle}
+
+\func{void}{DrawCircle}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ radius}}
+
+\func{void}{DrawCircle}{\param{const wxPoint\&}{ pt}, \param{wxCoord}{ radius}}
+
+Draws a circle with the given centre and radius.
+
+\wxheading{See also}
+
+\helpref{DrawEllipse}{wxdcdrawellipse}
+
\membersection{wxDC::DrawEllipse}\label{wxdcdrawellipse}
\func{void}{DrawEllipse}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
-Draws an ellipse contained in the rectangle with the given top left corner, and with the
-given size. The current pen is used for the outline and the current brush for
-filling the shape.
+\func{void}{DrawEllipse}{\param{const wxPoint\&}{ pt}, \param{const wxSize\&}{ size}}
+
+\func{void}{DrawEllipse}{\param{const wxRect\&}{ rect}}
+
+Draws an ellipse contained in the rectangle specified either with the given top
+left corner and the given size or directly. The current pen is used for the
+outline and the current brush for filling the shape.
+
+\wxheading{See also}
+
+\helpref{DrawCircle}{wxdcdrawcircle}
\membersection{wxDC::DrawEllipticArc}\label{wxdcdrawellipticarc}
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}
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}}
\wxheading{See also}
\helpref{wxDC::CacheEnabled}{wxdccacheenabled}, \helpref{wxDC::ClearCache}
+\end{comment}
\membersection{wxDC::EndDoc}\label{wxdcenddoc}
\membersection{wxDC::FloodFill}\label{wxdcfloodfill}
-\func{void}{FloodFill}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{const wxColour\&}{ colour}, \param{int}{ style=wxFLOOD\_SURFACE}}
+\func{bool}{FloodFill}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{const wxColour\&}{ colour}, \param{int}{ style=wxFLOOD\_SURFACE}}
Flood fills the device context starting from the given point, using
the {\it current brush colour}, and using a style:
\item wxFLOOD\_BORDER: the area to be flooded is bounded by the given colour.
\end{itemize}
-{\it Note:} this function is available in MS Windows only.
+Returns FALSE if the operation failed.
+
+{\it Note:} The present implementation for non-Windows platforms may fail to find
+colour borders if the pixels do not match the colour exactly. However the
+function will still return TRUE.
\membersection{wxDC::GetBackground}\label{wxdcgetbackground}
rectangle are returned as a tuple.}
\perlnote{This method takes no arguments and returns a four element list
-{\tt ( \$x, \$y, \$width, \$height )}}
+{\tt ( x, y, width, height )}}
\membersection{wxDC::GetFont}\label{wxdcgetfont}
\indented{2cm}{\begin{twocollist}
\twocolitem{{\bf GetSize()}}{Returns a Wx::Size}
\twocolitem{{\bf GetSizeWH()}}{Returns a 2-element list
- {\tt ( \$width, \$height )}}
+ {\tt ( width, height )}}
\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 )}
+ array {\tt ( width, height, descent, externalLeading )}
}
\membersection{wxDC::GetTextForeground}\label{wxdcgettextforeground}
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 )}}
+\perlnote{In wxPerl this method takes no arguments and return a two element
+ array {\tt ( x, y )}}
\membersection{wxDC::LogicalToDeviceX}\label{wxdclogicaltodevicex}
\func{wxCoord}{LogicalToDeviceXRel}{\param{wxCoord}{ x}}
Converts logical X coordinate to relative device coordinate, using the current
-mapping mode. Use this for converting a width, for example.
+mapping mode but ignoring the x axis orientation.
+Use this for converting a width, for example.
\membersection{wxDC::LogicalToDeviceY}\label{wxdclogicaltodevicey}
\func{wxCoord}{LogicalToDeviceYRel}{\param{wxCoord}{ y}}
Converts logical Y coordinate to relative device coordinate, using the current
-mapping mode. Use this for converting a height, for example.
+mapping mode but ignoring the y axis orientation.
+Use this for converting a height, for example.
\membersection{wxDC::MaxX}\label{wxdcmaxx}
\helpref{CalcBoundingBox}{wxdccalcboundingbox}
+\membersection{wxDC::SetAxisOrientation}\label{wxdcsetaxisorientation}
+
+\func{void}{SetAxisOrientation}{\param{bool}{ xLeftRight},
+ \param{bool}{ yBottomUp}}
+
+Sets the x and y axis orientation (i.e., the direction from lowest to
+highest values on the axis). The default orientation is the natural
+orientation, e.g. x axis from left to right and y axis from bottom up.
+
+\wxheading{Parameters}
+
+\docparam{xLeftRight}{True to set the x axis orientation to the natural
+left to right orientation, false to invert it.}
+
+\docparam{yBottomUp}{True to set the y axis orientation to the natural
+bottom up orientation, false to invert it.}
+
\membersection{wxDC::SetDeviceOrigin}\label{wxdcsetdeviceorigin}
\func{void}{SetDeviceOrigin}{\param{wxCoord}{ x}, \param{wxCoord}{ y}}
\func{void}{SetClippingRegion}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
+\func{void}{SetClippingRegion}{\param{const wxPoint\& }{pt}, \param{const wxSize\& }{sz}}
+
+\func{void}{SetClippingRegion}{\param{const wxRect\&}{ rect}}
+
\func{void}{SetClippingRegion}{\param{const wxRegion\&}{ region}}
-Sets the clipping region for the DC. The clipping region is an area
-to which drawing is restricted. Possible uses for the clipping region are for clipping text
-or for speeding up window redraws when only a known area of the screen is damaged.
+Sets the clipping region for this device context to the intersection of the
+given region described by the parameters of this method and the previously set
+clipping region. You should call
+\helpref{DestroyClippingRegion}{wxdcdestroyclippingregion} if you want to set
+the clipping region exactly to the region specified.
+
+The clipping region is an area to which drawing is restricted. Possible uses
+for the clipping region are for clipping text or for speeding up window redraws
+when only a known area of the screen is damaged.
\wxheading{See also}
\func{void}{SetFont}{\param{const wxFont\& }{font}}
-Sets the current font for the DC.
-
-If the argument is wxNullFont, the current font is selected out of the device
-context, and the original font restored, allowing the current font to
-be destroyed safely.
+Sets the current font for the DC. It must be a valid font, in particular you
+should not pass {\tt wxNullFont} to this method.
See also \helpref{wxFont}{wxfont}.
in X, text drawing isn't handled consistently with the mapping mode; a
font is always specified in point size. However, setting the {\it
user scale} (see \helpref{wxDC::SetUserScale}{wxdcsetuserscale}) scales the text appropriately. In
-Windows, scaleable TrueType fonts are always used; in X, results depend
+Windows, scalable TrueType fonts are always used; in X, results depend
on availability of fonts, but usually a reasonable match is found.
Note that the coordinate origin should ideally be selectable, but for
\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
+clipping region and then automatically destroys it in its destructor. Using
it ensures that unwanted clipping region is not left set on the DC.
\wxheading{Derived from}
\func{}{\destruct{wxDCClipper}}{\void}
-Destructor: destroyes the clipping region set in the constructor.
+Destructor: destroys the clipping region set in the constructor.
projects / wxWidgets.git / blobdiff