A wxDC is a {\it device context} onto which graphics and text can be drawn.
It is intended to represent a number of output devices in a generic way,
-so a canvas has a device context and a printer also has a device context.
+so a window can have a device context associated with it, and a printer also has a device context.
In this way, the same piece of code may write to a number of different devices,
if the device context is used as a parameter.
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}
+\wxheading{Include files}
+
+<wx/dc.h>
+
\wxheading{See also}
\helpref{Overview}{dcoverview}
\latexignore{\rtfignore{\wxheading{Members}}}
+
\membersection{wxDC::wxDC}
\func{}{wxDC}{\void}
Constructor.
+
\membersection{wxDC::\destruct{wxDC}}
\func{}{\destruct{wxDC}}{\void}
Destructor.
+
\membersection{wxDC::BeginDrawing}\label{wxdcbegindrawing}
\func{void}{BeginDrawing}{\void}
and brush settings would be lost if the device context were obtained and
released for each drawing operation.
+
\membersection{wxDC::Blit}\label{wxdcblit}
-\func{bool}{Blit}{\param{long}{ xdest}, \param{long}{ ydest}, \param{long}{ width}, \param{long}{ height},
- \param{wxDC* }{source}, \param{long}{ xsrc}, \param{long}{ ysrc}, \param{int}{ logicalFunc},
- \param{bool }{useMask}}
+\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{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:
+\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 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
+wxWidgets 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.
See \helpref{wxMemoryDC}{wxmemorydc} for typical usage.
-wxheading{See also}
+\wxheading{See also}
\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}}
+
+Adds the specified point to the bounding box which can be retrieved with
+\helpref{MinX}{wxdcminx}, \helpref{MaxX}{wxdcmaxx} and
+\helpref{MinY}{wxdcminy}, \helpref{MaxY}{wxdcmaxy} functions.
+
+\wxheading{See also}
+
+\helpref{ResetBoundingBox}{wxdcresetboundingbox}
+
+
\membersection{wxDC::Clear}\label{wxdcclear}
\func{void}{Clear}{\void}
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{long}{ x}, \param{long}{ y}}
+\func{void}{CrossHair}{\param{wxCoord}{ x}, \param{wxCoord}{ y}}
Displays a cross hair using the current pen. This is a vertical
-and horizontal line the height and width of the canvas, centred
+and horizontal line the height and width of the window, centred
on the given point.
+
\membersection{wxDC::DestroyClippingRegion}\label{wxdcdestroyclippingregion}
\func{void}{DestroyClippingRegion}{\void}
Destroys the current clipping region so that none of the DC is clipped.
See also \helpref{wxDC::SetClippingRegion}{wxdcsetclippingregion}.
+
\membersection{wxDC::DeviceToLogicalX}\label{wxdcdevicetologicalx}
-\func{long}{DeviceToLogicalX}{\param{long}{ x}}
+\func{wxCoord}{DeviceToLogicalX}{\param{wxCoord}{ x}}
Convert device X coordinate to logical coordinate, using the current
mapping mode.
+
\membersection{wxDC::DeviceToLogicalXRel}\label{wxdcdevicetologicalxrel}
-\func{long}{DeviceToLogicalXRel}{\param{long}{ x}}
+\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{long}{DeviceToLogicalY}{\param{long}{ y}}
+\func{wxCoord}{DeviceToLogicalY}{\param{wxCoord}{ y}}
Converts device Y coordinate to logical coordinate, using the current
mapping mode.
+
\membersection{wxDC::DeviceToLogicalYRel}\label{wxdcdevicetologicalyrel}
-\func{long}{DeviceToLogicalYRel}{\param{long}{ y}}
+\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}
-\func{void}{DrawArc}{\param{long}{ x1}, \param{long}{ y1}, \param{long}{ x2}, \param{long}{ y2}, \param{double}{ xc}, \param{double}{ yc}}
+\func{void}{DrawArc}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}, \param{wxCoord}{ xc}, \param{wxCoord}{ yc}}
-Draws an arc, centred on ({\it xc, yc}), with starting point ({\it x1, y1})
+Draws an arc of a circle, centred on ({\it xc, yc}), with starting point ({\it x1, y1})
and ending at ({\it x2, y2}). The current pen is used for the outline
and the current brush for filling the shape.
+The arc is drawn in an anticlockwise direction from the start point to the end point.
+
+
+\membersection{wxDC::DrawBitmap}\label{wxdcdrawbitmap}
+
+\func{void}{DrawBitmap}{\param{const wxBitmap\&}{ bitmap}, \param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{bool}{ transparent}}
+
+Draw a bitmap on the device context at the specified point. If {\it transparent} is true and the bitmap has
+a transparency mask, the bitmap will be drawn transparently.
+
+When drawing a mono-bitmap, the current text foreground colour will be used to draw the foreground
+of the bitmap (all bits set to 1), and the current text background colour to draw the background
+(all bits set to 0). See also \helpref{SetTextForeground}{wxdcsettextforeground},
+\helpref{SetTextBackground}{wxdcsettextbackground} and \helpref{wxMemoryDC}{wxmemorydc}.
+
+
+\membersection{wxDC::DrawCheckMark}\label{wxdcdrawcheckmark}
+
+\func{void}{DrawCheckMark}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
+
+\func{void}{DrawCheckMark}{\param{const wxRect \&}{rect}}
+
+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{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height}}
+\func{void}{DrawEllipse}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
+
+\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}
-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.
\membersection{wxDC::DrawEllipticArc}\label{wxdcdrawellipticarc}
-\func{void}{DrawEllipticArc}{\param{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height},
+\func{void}{DrawEllipticArc}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height},
\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 canvas and PostScript device contexts.
+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.
{\it x} and {\it y} specify the x and y coordinates of the upper-left corner of the rectangle that contains
the ellipse.
-{\it width} and {\it height} specify the width and height of the rectangle that contains
+{\it width} and {\it height} specify the width and height of the rectangle that contains
the ellipse.
{\it start} and {\it end} specify the start and end of the arc relative to the three-o'clock
counter-clockwise motion. If {\it start} is equal to {\it end}, a
complete ellipse will be drawn.
+
\membersection{wxDC::DrawIcon}\label{wxdcdrawicon}
-\func{void}{DrawIcon}{\param{const wxIcon\&}{ icon}, \param{long}{ x}, \param{long}{ y}}
+\func{void}{DrawIcon}{\param{const wxIcon\&}{ icon}, \param{wxCoord}{ x}, \param{wxCoord}{ y}}
Draw an icon on the display (does nothing if the device context is PostScript).
-This can be the simplest way of drawing bitmaps on a canvas.
+This can be the simplest way of drawing bitmaps on a window.
+
\membersection{wxDC::DrawLine}\label{wxdcdrawline}
-\func{void}{DrawLine}{\param{long}{ x1}, \param{long}{ y1}, \param{long}{ x2}, \param{long}{ y2}}
+\func{void}{DrawLine}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}}
Draws a line from the first point to the second. The current pen is used
-for drawing the line.
+for drawing the line. Note that the point $(x2, y2)$ is {\emph not} part of the
+line and is not drawn by this function (this is consistent with the behaviour
+of many other toolkits).
+
\membersection{wxDC::DrawLines}\label{wxdcdrawlines}
-\func{void}{DrawLines}{\param{int}{ n}, \param{wxPoint}{ points[]}, \param{long}{ xoffset = 0}, \param{long}{ yoffset = 0}}
+\func{void}{DrawLines}{\param{int}{ n}, \param{wxPoint}{ points[]}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0}}
-\func{void}{DrawLines}{\param{wxList *}{points}, \param{long}{ xoffset = 0}, \param{long}{ yoffset = 0}}
+\func{void}{DrawLines}{\param{wxList *}{points}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0}}
Draws lines using an array of {\it points} of size {\it n}, or list of
pointers to points, adding the optional offset coordinate. The current
pen is used for drawing the lines. The programmer is responsible for
deleting the list of points.
+\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{long}{ xoffset = 0}, \param{long}{ yoffset = 0},\\
+\func{void}{DrawPolygon}{\param{int}{ n}, \param{wxPoint}{ points[]}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0},\\
\param{int }{fill\_style = wxODDEVEN\_RULE}}
-\func{void}{DrawPolygon}{\param{wxList *}{points}, \param{long}{ xoffset = 0}, \param{long}{ yoffset = 0},\\
+\func{void}{DrawPolygon}{\param{wxList *}{points}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0},\\
\param{int }{fill\_style = wxODDEVEN\_RULE}}
Draws a filled polygon using an array of {\it points} of size {\it n},
for filling the shape. Using a transparent brush suppresses filling.
The programmer is responsible for deleting the list of points.
-Note that wxWindows automatically closes the first and last points.
+Note that wxWidgets automatically closes the first and last points.
+
+\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::DrawPolyPolygon}\label{wxdcdrawpolypolygon}
+
+\func{void}{DrawPolyPolygon}{\param{int}{ n}, \param{int}{ count[]}, \param{wxPoint}{ points[]}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0},\\
+ \param{int }{fill\_style = wxODDEVEN\_RULE}}
+
+Draws two or more filled polygons using an array of {\it points}, adding the
+optional offset coordinates.
+
+Notice that for the platforms providing a native implementation
+of this function (Windows and PostScript-based wxDC currently), this is more
+efficient than using \helpref{DrawPolygon}{wxdcdrawpolygon} in a loop.
+
+{\it n} specifies the number of polygons to draw, the array {\it count} of size
+{\it n} specifies the number of points in each of the polygons in the
+{\it points} array.
+
+The last argument specifies the fill rule: {\bf wxODDEVEN\_RULE} (the default)
+or {\bf wxWINDING\_RULE}.
+
+The current pen is used for drawing the outline, and the current brush for
+filling the shape. Using a transparent brush suppresses filling.
+
+The polygons maybe disjoint or overlapping. Each polygon specified in a call to
+{\bf DrawPolyPolygon} must be closed. Unlike polygons created by the
+\helpref{DrawPolygon}{wxdcdrawpolygon} member function, the polygons created by
+{\bf DrawPolyPolygon} are not closed automatically.
+
+\pythonnote{Not implemented yet}
+
+\perlnote{Not implemented yet}
+
\membersection{wxDC::DrawPoint}\label{wxdcdrawpoint}
-\func{void}{DrawPoint}{\param{long}{ x}, \param{long}{ y}}
+\func{void}{DrawPoint}{\param{wxCoord}{ x}, \param{wxCoord}{ y}}
Draws a point using the current pen.
+
\membersection{wxDC::DrawRectangle}\label{wxdcdrawrectangle}
-\func{void}{DrawRectangle}{\param{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height}}
+\func{void}{DrawRectangle}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}}
Draws a 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.
+
+\membersection{wxDC::DrawRotatedText}\label{wxdcdrawrotatedtext}
+
+\func{void}{DrawRotatedText}{\param{const wxString\& }{text}, \param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{double}{ angle}}
+
+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}
+
+
\membersection{wxDC::DrawRoundedRectangle}\label{wxdcdrawroundedrectangle}
-\func{void}{DrawRoundedRectangle}{\param{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height}, \param{double}{ radius = 20}}
+\func{void}{DrawRoundedRectangle}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}, \param{double}{ radius = 20}}
Draws a rectangle with the given top left corner, and with the given
size. The corners are quarter-circles using the given radius. The
the strange effects X produces when the corners are too big for
the rectangle.
+
\membersection{wxDC::DrawSpline}\label{wxdcdrawspline}
\func{void}{DrawSpline}{\param{wxList *}{points}}
using a series of lines, using an algorithm taken from the X drawing
program `XFIG'.
-\func{void}{DrawSpline}{\param{long}{ x1}, \param{long}{ y1}, \param{long}{ x2}, \param{long}{ y2}, \param{long}{ x3}, \param{long}{ y3}}
+\func{void}{DrawSpline}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}, \param{wxCoord}{ x3}, \param{wxCoord}{ y3}}
Draws a three-point spline using the current pen.
+\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{long}{ x}, \param{long}{ y}}
+\func{void}{DrawText}{\param{const wxString\& }{text}, \param{wxCoord}{ x}, \param{wxCoord}{ y}}
Draws a text string at the specified point, using the current text font,
and the current text foreground and background colours.
to get the dimensions of a text string, which can be used to position the
text more precisely.
+{\bf NB:} under wxGTK the current
+\helpref{logical function}{wxdcgetlogicalfunction} is used by this function
+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}
Ends a document (only relevant when outputting to a printer).
+
\membersection{wxDC::EndDrawing}\label{wxdcenddrawing}
\func{void}{EndDrawing}{\void}
drawing primitives between {\bf BeginDrawing} and {\bf EndDrawing}\rtfsp
calls.
+
\membersection{wxDC::EndPage}\label{wxdcendpage}
\func{void}{EndPage}{\void}
Ends a document page (only relevant when outputting to a printer).
+
\membersection{wxDC::FloodFill}\label{wxdcfloodfill}
-\func{void}{FloodFill}{\param{long}{ x}, \param{long}{ y}, \param{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, in the given colour,
-and using a style:
+Flood fills the device context starting from the given point, using
+the {\it current brush colour}, and using a style:
\begin{itemize}\itemsep=0pt
\item wxFLOOD\_SURFACE: the flooding occurs until a colour other than the given colour is encountered.
\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}
-\func{wxBrush *}{GetBackground}{\void}
+\func{wxBrush\&}{GetBackground}{\void}
+
+\constfunc{const wxBrush\&}{GetBackground}{\void}
Gets the brush used for painting the background (see \helpref{wxDC::SetBackground}{wxdcsetbackground}).
+
+\membersection{wxDC::GetBackgroundMode}\label{wxdcgetbackgroundmode}
+
+\constfunc{int}{GetBackgroundMode}{\void}
+
+Returns the current background mode: {\tt wxSOLID} or {\tt wxTRANSPARENT}.
+
+\wxheading{See also}
+
+\helpref{SetBackgroundMode}{wxdcsetbackgroundmode}
+
+
\membersection{wxDC::GetBrush}\label{wxdcgetbrush}
-\func{wxBrush *}{GetBrush}{\void}
+\func{wxBrush\&}{GetBrush}{\void}
+
+\constfunc{const wxBrush\&}{GetBrush}{\void}
Gets the current brush (see \helpref{wxDC::SetBrush}{wxdcsetbrush}).
+
\membersection{wxDC::GetCharHeight}\label{wxdcgetcharheight}
-\func{long}{GetCharHeight}{\void}
+\func{wxCoord}{GetCharHeight}{\void}
Gets the character height of the currently set font.
+
\membersection{wxDC::GetCharWidth}\label{wxdcgetcharwidth}
-\func{long}{GetCharWidth}{\void}
+\func{wxCoord}{GetCharWidth}{\void}
Gets the average character width of the currently set font.
-\membersection{wxCanvas::GetClippingBox}\label{wxdcgetclippingbox}
-\func{void}{GetClippingBox}{\param{long}{ *x}, \param{long}{ *y}, \param{long}{ *width}, \param{long}{ *height}}
+\membersection{wxDC::GetClippingBox}\label{wxdcgetclippingbox}
+
+\func{void}{GetClippingBox}{\param{wxCoord}{ *x}, \param{wxCoord}{ *y}, \param{wxCoord}{ *width}, \param{wxCoord}{ *height}}
Gets the rectangle surrounding the current clipping region.
+\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}
+\func{wxFont\&}{GetFont}{\void}
+
+\constfunc{const wxFont\&}{GetFont}{\void}
Gets the current font (see \helpref{wxDC::SetFont}{wxdcsetfont}).
+
\membersection{wxDC::GetLogicalFunction}\label{wxdcgetlogicalfunction}
\func{int}{GetLogicalFunction}{\void}
Gets the current logical function (see \helpref{wxDC::SetLogicalFunction}{wxdcsetlogicalfunction}).
+
\membersection{wxDC::GetMapMode}\label{wxdcgetmapmode}
\func{int}{GetMapMode}{\void}
Gets the {\it mapping mode} for the device context (see \helpref{wxDC::SetMapMode}{wxdcsetmapmode}).
+
\membersection{wxDC::GetOptimization}\label{wxdcgetoptimization}
\func{bool}{GetOptimization}{\void}
-Returns TRUE if device context optimization is on.
+Returns true if device context optimization is on.
See \helpref{wxDC::SetOptimization}{wxsetoptimization} for details.
+
+\membersection{wxDC::GetPartialTextExtents}\label{wxdcgetpartialtextextents}
+
+\constfunc{bool}{GetPartialTextExtents}{\param{const wxString\& }{text},
+\param{wxArrayInt\& }{widths}}
+
+Fills the {\it widths} array with the widths from the begining of
+{\it text} to the coresponding character of {\it text}. The generic
+version simply builds a running total of the widths of each character
+using \helpref{GetTextExtent}{wxdcgettextextent}, however if the
+various platforms have a native API function that is faster or more
+accurate than the generic implementaiton then it should be used
+instead.
+
+\pythonnote{This method only takes the {\it text} parameter and
+ returns a Python list of integers.}
+
\membersection{wxDC::GetPen}\label{wxdcgetpen}
-\func{wxPen *}{GetPen}{\void}
+\func{wxPen\&}{GetPen}{\void}
+
+\constfunc{const wxPen\&}{GetPen}{\void}
Gets the current pen (see \helpref{wxDC::SetPen}{wxdcsetpen}).
\membersection{wxDC::GetPixel}\label{wxdcgetpixel}
-\func{bool}{GetPixel}{\param{long}{ x}, \param{long}{ y}, \param{wxColour *}{colour}}
+\func{bool}{GetPixel}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxColour *}{colour}}
+
+Sets {\it colour} to the colour at the specified location.
+Not available for wxPostScriptDC or wxMetafileDC.
-Sets {\it colour} to the colour at the specified location. Windows only; an X implementation
-is being worked on. Not available for wxPostScriptDC or wxMetaFileDC.
+\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::GetPPI}\label{wxdcgetppi}
+
+\constfunc{wxSize}{GetPPI}{\void}
+
+Returns the resolution of the device in pixels per inch.
\membersection{wxDC::GetSize}\label{wxdcgetsize}
-\func{void}{GetSize}{\param{long *}{width}, \param{long *}{height}}
+\constfunc{void}{GetSize}{\param{wxCoord *}{width}, \param{wxCoord *}{height}}
-For a PostScript device context, this gets the maximum size of graphics
-drawn so far on the device context.
+\constfunc{wxSize}{GetSize}{\void}
-For a Windows printer device context, this gets the horizontal and vertical
-resolution. It can be used to scale graphics to fit the page when using
-a Windows printer device context. For example, if {\it maxX} and {\it maxY}\rtfsp
+This gets the horizontal and vertical resolution in device units. It can be used to scale graphics to fit the page.
+For example, if {\it maxX} and {\it maxY}\rtfsp
represent the maximum horizontal and vertical `pixel' values used in your
application, the following code will scale the graphic to fit on the
printer page:
\begin{verbatim}
- long w, h;
+ wxCoord w, h;
dc.GetSize(&w, &h);
double scaleX=(double)(maxX/w);
double scaleY=(double)(maxY/h);
dc.SetUserScale(min(scaleX,scaleY),min(scaleX,scaleY));
\end{verbatim}
+\pythonnote{In place of a single overloaded method name, wxPython
+implements the following methods:\par
+\indented{2cm}{\begin{twocollist}
+\twocolitem{{\bf GetSize()}}{Returns a wxSize}
+\twocolitem{{\bf GetSizeTuple()}}{Returns a 2-tuple (width, 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::GetSizeMM}\label{wxdcgetsizemm}
+
+\constfunc{void}{GetSizeMM}{\param{wxCoord *}{width}, \param{wxCoord *}{height}}
+
+\constfunc{wxSize}{GetSizeMM}{\void}
+
+Returns the horizontal and vertical resolution in millimetres.
+
\membersection{wxDC::GetTextBackground}\label{wxdcgettextbackground}
\func{wxColour\&}{GetTextBackground}{\void}
+\constfunc{const wxColour\&}{GetTextBackground}{\void}
+
Gets the current text background colour (see \helpref{wxDC::SetTextBackground}{wxdcsettextbackground}).
+
\membersection{wxDC::GetTextExtent}\label{wxdcgettextextent}
-\func{void}{GetTextExtent}{\param{const wxString\& }{string}, \param{long *}{w}, \param{long *}{h},\\
- \param{long *}{descent = NULL}, \param{long *}{externalLeading = NULL}, \param{wxFont *}{font = NULL}}
+\func{void}{GetTextExtent}{\param{const wxString\& }{string}, \param{wxCoord *}{w}, \param{wxCoord *}{h},\\
+ \param{wxCoord *}{descent = NULL}, \param{wxCoord *}{externalLeading = NULL}, \param{wxFont *}{font = NULL}}
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
See also \helpref{wxFont}{wxfont}, \helpref{wxDC::SetFont}{wxdcsetfont}.
+\pythonnote{The following methods are implemented in wxPython:\par
+\indented{2cm}{\begin{twocollist}
+\twocolitem{{\bf GetTextExtent(string)}}{Returns a 2-tuple, (width, height)}
+\twocolitem{{\bf GetFullTextExtent(string, font=NULL)}}{Returns a
+4-tuple, (width, height, descent, externalLeading) }
+\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}
+\constfunc{const wxColour\&}{GetTextForeground}{\void}
+
Gets the current text foreground colour (see \helpref{wxDC::SetTextForeground}{wxdcsettextforeground}).
+
+
+\membersection{wxDC::GetUserScale}\label{wxdcgetuserscale}
+
+\func{void}{GetUserScale}{\param{double}{ *x}, \param{double}{ *y}}
+
+Gets the current user scale factor (set by \helpref{SetUserScale}{wxdcsetuserscale}).
+
+\perlnote{In wxPerl this method takes no arguments and return a two element
+ array {\tt ( x, y )}}
+
+
\membersection{wxDC::LogicalToDeviceX}\label{wxdclogicaltodevicex}
-\func{long}{LogicalToDeviceX}{\param{long}{ x}}
+\func{wxCoord}{LogicalToDeviceX}{\param{wxCoord}{ x}}
Converts logical X coordinate to device coordinate, using the current
mapping mode.
+
\membersection{wxDC::LogicalToDeviceXRel}\label{wxdclogicaltodevicexrel}
-\func{long}{LogicalToDeviceXRel}{\param{long}{ x}}
+\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{long}{LogicalToDeviceY}{\param{long}{ y}}
+\func{wxCoord}{LogicalToDeviceY}{\param{wxCoord}{ y}}
Converts logical Y coordinate to device coordinate, using the current
mapping mode.
+
\membersection{wxDC::LogicalToDeviceYRel}\label{wxdclogicaltodeviceyrel}
-\func{long}{LogicalToDeviceYRel}{\param{long}{ y}}
+\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}
-\func{long}{MaxX}{\void}
+\func{wxCoord}{MaxX}{\void}
Gets the maximum horizontal extent used in drawing commands so far.
+
\membersection{wxDC::MaxY}\label{wxdcmaxy}
-\func{long}{MaxY}{\void}
+\func{wxCoord}{MaxY}{\void}
Gets the maximum vertical extent used in drawing commands so far.
+
\membersection{wxDC::MinX}\label{wxdcminx}
-\func{long}{MinX}{\void}
+\func{wxCoord}{MinX}{\void}
Gets the minimum horizontal extent used in drawing commands so far.
+
\membersection{wxDC::MinY}\label{wxdcminy}
-\func{long}{MinY}{\void}
+\func{wxCoord}{MinY}{\void}
Gets the minimum vertical extent used in drawing commands so far.
+
\membersection{wxDC::Ok}\label{wxdcok}
\func{bool}{Ok}{\void}
-Returns TRUE if the DC is ok to use.
+Returns true if the DC is ok to use.
+
+
+\membersection{wxDC::ResetBoundingBox}\label{wxdcresetboundingbox}
+
+\func{void}{ResetBoundingBox}{\void}
+
+Resets the bounding box: after a call to this function, the bounding box
+doesn't contain anything.
+
+\wxheading{See also}
+
+\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{long}{ x}, \param{long}{ y}}
+\func{void}{SetDeviceOrigin}{\param{wxCoord}{ x}, \param{wxCoord}{ y}}
Sets the device origin (i.e., the origin in pixels after scaling has been
applied).
This function may be useful in Windows printing
operations for placing a graphic on a page.
+
\membersection{wxDC::SetBackground}\label{wxdcsetbackground}
\func{void}{SetBackground}{\param{const wxBrush\& }{brush}}
Sets the current background brush for the DC.
+
\membersection{wxDC::SetBackgroundMode}\label{wxdcsetbackgroundmode}
\func{void}{SetBackgroundMode}{\param{int}{ mode}}
{\it mode} may be one of wxSOLID and wxTRANSPARENT. This setting determines
whether text will be drawn with a background colour or not.
+
\membersection{wxDC::SetClippingRegion}\label{wxdcsetclippingregion}
-\func{void}{SetClippingRegion}{\param{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height}}
+\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 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}
-Sets the clipping region for the DC. The clipping region is a rectangular area
-to which drawing is restricted. Possible uses for the clipping region are for clipping text
-or for speeding up canvas redraws when only a known area of the screen is damaged.
+\helpref{wxDC::DestroyClippingRegion}{wxdcdestroyclippingregion}, \helpref{wxRegion}{wxregion}
-See also \helpref{wxDC::DestroyClippingRegion}{wxdcdestroyclippingregion}.
\membersection{wxDC::SetPalette}\label{wxdcsetpalette}
\func{void}{SetPalette}{\param{const wxPalette\& }{palette}}
-If this is a canvas DC or memory DC, assigns the given palette to the window
+If this is a window DC or memory DC, assigns the given palette to the window
or bitmap associated with the DC. If the argument is wxNullPalette, the current
palette is selected out of the device context, and the original palette
restored.
See \helpref{wxPalette}{wxpalette} for further details.
+
\membersection{wxDC::SetBrush}\label{wxdcsetbrush}
\func{void}{SetBrush}{\param{const wxBrush\& }{brush}}
See also \helpref{wxBrush}{wxbrush}.
+See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours
+when drawing into a monochrome bitmap.
+
+
\membersection{wxDC::SetFont}\label{wxdcsetfont}
\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}.
+
\membersection{wxDC::SetLogicalFunction}\label{wxdcsetlogicalfunction}
\func{void}{SetLogicalFunction}{\param{int}{ function}}
-Sets the current logical function for the canvas. This determines how
+Sets the current logical function for the device context. This determines how
a source pixel (from a pen or brush colour, or source device context if
using \helpref{wxDC::Blit}{wxdcblit}) combines with a destination pixel in the
current device context.
The default is wxCOPY, which simply draws with the current colour.
The others combine the current colour and the background using a
-logical operation. wxXOR is commonly used for drawing rubber bands or
+logical operation. wxINVERT is commonly used for drawing rubber bands or
moving outlines, since drawing twice reverts to the original colour.
+
\membersection{wxDC::SetMapMode}\label{wxdcsetmapmode}
\func{void}{SetMapMode}{\param{int}{ int}}
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
-now is always at the top left of the screen/printer.
+The coordinate origin is always at the top left of the screen/printer.
-Drawing to a Windows printer device context under UNIX
-uses the current mapping mode, but mapping mode is currently ignored for
-PostScript output.
+Drawing to a Windows printer device context uses the current mapping mode,
+but mapping mode is currently ignored for PostScript output.
The mapping mode can be one of the following:
\begin{twocollist}\itemsep=0pt
-\twocolitem{MM\_TWIPS}{Each logical unit is 1/20 of a point, or 1/1440 of
+\twocolitem{wxMM\_TWIPS}{Each logical unit is 1/20 of a point, or 1/1440 of
an inch.}
-\twocolitem{MM\_POINTS}{Each logical unit is a point, or 1/72 of an inch.}
-\twocolitem{MM\_METRIC}{Each logical unit is 1 mm.}
-\twocolitem{MM\_LOMETRIC}{Each logical unit is 1/10 of a mm.}
-\twocolitem{MM\_TEXT}{Each logical unit is 1 pixel.}
+\twocolitem{wxMM\_POINTS}{Each logical unit is a point, or 1/72 of an inch.}
+\twocolitem{wxMM\_METRIC}{Each logical unit is 1 mm.}
+\twocolitem{wxMM\_LOMETRIC}{Each logical unit is 1/10 of a mm.}
+\twocolitem{wxMM\_TEXT}{Each logical unit is 1 pixel.}
\end{twocollist}
+
\membersection{wxDC::SetOptimization}\label{wxsetoptimization}
\func{void}{SetOptimization}{\param{bool }{optimize}}
-If {\it optimize} is TRUE (the default), this function sets optimization mode on.
+If {\it optimize} is true (the default), this function sets optimization mode on.
This currently means that under X, the device context will not try to set a pen or brush
property if it is known to be set already. This approach can fall down
-if non-wxWindows code is using the same device context or window, for example
+if non-wxWidgets code is using the same device context or window, for example
when the window is a panel on which the windowing system draws panel items.
-The wxWindows device context 'memory' will now be out of step with reality.
+The wxWidgets device context 'memory' will now be out of step with reality.
Setting optimization off, drawing, then setting it back on again, is a trick
that must occasionally be employed.
+
\membersection{wxDC::SetPen}\label{wxdcsetpen}
\func{void}{SetPen}{\param{const wxPen\& }{pen}}
If the argument is wxNullPen, the current pen is selected out of the device
context, and the original pen restored.
+See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours
+when drawing into a monochrome bitmap.
+
+
\membersection{wxDC::SetTextBackground}\label{wxdcsettextbackground}
\func{void}{SetTextBackground}{\param{const wxColour\& }{colour}}
Sets the current text background colour for the DC.
+
\membersection{wxDC::SetTextForeground}\label{wxdcsettextforeground}
\func{void}{SetTextForeground}{\param{const wxColour\& }{colour}}
Sets the current text foreground colour for the DC.
+See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours
+when drawing into a monochrome bitmap.
+
+
\membersection{wxDC::SetUserScale}\label{wxdcsetuserscale}
\func{void}{SetUserScale}{\param{double}{ xScale}, \param{double}{ yScale}}
Sets the user scaling factor, useful for applications which require
`zooming'.
+
\membersection{wxDC::StartDoc}\label{wxdcstartdoc}
\func{bool}{StartDoc}{\param{const wxString\& }{message}}
Starts a document (only relevant when outputting to a printer).
Message is a message to show whilst printing.
+
\membersection{wxDC::StartPage}\label{wxdcstartpage}
\func{bool}{StartPage}{\void}
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 destroys 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: destroys the clipping region set in the constructor.
+
projects / wxWidgets.git / blobdiff