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.
\helpref{wxObject}{wxobject}
+\wxheading{Include files}
+
+<wx/dc.h>
+
\wxheading{See also}
\helpref{Overview}{dcoverview}
\func{void}{CrossHair}{\param{long}{ x}, \param{long}{ 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}{DrawArc}{\param{long}{ x1}, \param{long}{ y1}, \param{long}{ x2}, \param{long}{ y2}, \param{double}{ xc}, \param{double}{ 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{long}{ x}, \param{long}{ 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.
+
\membersection{wxDC::DrawEllipse}\label{wxdcdrawellipse}
\func{void}{DrawEllipse}{\param{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height}}
\func{void}{DrawEllipticArc}{\param{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height},
\param{double}{ start}, \param{double}{ end}}
-Draws an arc of an ellipse. The current pen is used for drawing the arc and
+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.
+X window and PostScript device contexts.
{\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
\func{void}{DrawIcon}{\param{const wxIcon\&}{ icon}, \param{long}{ x}, \param{long}{ 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}
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.}
+
\membersection{wxDC::DrawPolygon}\label{wxdcdrawpolygon}
\func{void}{DrawPolygon}{\param{int}{ n}, \param{wxPoint}{ points[]}, \param{long}{ xoffset = 0}, \param{long}{ yoffset = 0},\\
Note that wxWindows automatically closes the first and last points.
+\pythonnote{The wxPython version of this method accepts a Python list
+of wxPoint objects.}
+
\membersection{wxDC::DrawPoint}\label{wxdcdrawpoint}
\func{void}{DrawPoint}{\param{long}{ x}, \param{long}{ y}}
Draws a three-point spline using the current pen.
+\pythonnote{The wxPython version of this method accepts a Python list
+of wxPoint objects.}
+
\membersection{wxDC::DrawText}\label{wxdcdrawtext}
\func{void}{DrawText}{\param{const wxString\& }{text}, \param{long}{ x}, \param{long}{ y}}
\membersection{wxDC::GetBackground}\label{wxdcgetbackground}
-\func{wxBrush *}{GetBackground}{\void}
+\func{wxBrush\&}{GetBackground}{\void}
Gets the brush used for painting the background (see \helpref{wxDC::SetBackground}{wxdcsetbackground}).
\membersection{wxDC::GetBrush}\label{wxdcgetbrush}
-\func{wxBrush *}{GetBrush}{\void}
+\func{wxBrush\&}{GetBrush}{\void}
Gets the current brush (see \helpref{wxDC::SetBrush}{wxdcsetbrush}).
Gets the average character width of the currently set font.
-\membersection{wxCanvas::GetClippingBox}\label{wxdcgetclippingbox}
+\membersection{wxDC::GetClippingBox}\label{wxdcgetclippingbox}
\func{void}{GetClippingBox}{\param{long}{ *x}, \param{long}{ *y}, \param{long}{ *width}, \param{long}{ *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.}
+
\membersection{wxDC::GetFont}\label{wxdcgetfont}
-\func{wxFont *}{GetFont}{\void}
+\func{wxFont\&}{GetFont}{\void}
Gets the current font (see \helpref{wxDC::SetFont}{wxdcsetfont}).
\membersection{wxDC::GetPen}\label{wxdcgetpen}
-\func{wxPen *}{GetPen}{\void}
+\func{wxPen\&}{GetPen}{\void}
Gets the current pen (see \helpref{wxDC::SetPen}{wxdcsetpen}).
\func{bool}{GetPixel}{\param{long}{ x}, \param{long}{ y}, \param{wxColour *}{colour}}
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.
+is being worked on. Not available for wxPostScriptDC or wxMetafileDC.
\membersection{wxDC::GetSize}\label{wxdcgetsize}
dc.SetUserScale(min(scaleX,scaleY),min(scaleX,scaleY));
\end{verbatim}
+\pythonnote{No arguments are required and the two values defining the
+size are returned as a tuple.}
+
\membersection{wxDC::GetTextBackground}\label{wxdcgettextbackground}
\func{wxColour\&}{GetTextBackground}{\void}
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}}
+}
+
\membersection{wxDC::GetTextForeground}\label{wxdcgettextforeground}
\func{wxColour\&}{GetTextForeground}{\void}
\func{void}{SetClippingRegion}{\param{long}{ x}, \param{long}{ y}, \param{long}{ width}, \param{long}{ height}}
-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.
+\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.
+
+\wxheading{See also}
-See also \helpref{wxDC::DestroyClippingRegion}{wxdcdestroyclippingregion}.
+\helpref{wxDC::DestroyClippingRegion}{wxdcdestroyclippingregion}, \helpref{wxRegion}{wxregion}
\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.
\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}
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}
projects / wxWidgets.git / blobdiff