/////////////////////////////////////////////////////////////////////////////
-// Name: dc
+// Name: dc.h
// Purpose: topic overview
// Author: wxWidgets team
// RCS-ID: $Id$
/////////////////////////////////////////////////////////////////////////////
/*!
-
- @page dc_overview Device context overview
-
+
+ @page overview_dc Device context overview
+
Classes: #wxBufferedDC, #wxBufferedPaintDC, #wxDC, #wxPostScriptDC,
- #wxMetafileDC, #wxMemoryDC, #wxPrinterDC,
- #wxScreenDC, #wxClientDC, #wxPaintDC,
- #wxWindowDC.
+ #wxMetafileDC, #wxMemoryDC, #wxPrinterDC, #wxScreenDC, #wxClientDC,
+ #wxPaintDC, #wxWindowDC.
+
A wxDC is a @e device context onto which graphics and text can be drawn.
- The device context is intended to represent a number of output devices in a generic way,
- with the same API being used throughout.
+ The device context is intended to represent a number of output devices in a
+ generic way, with the same API being used throughout.
+
Some device contexts are created temporarily in order to draw on a window.
- This is @true of #wxScreenDC, #wxClientDC, #wxPaintDC,
- and #wxWindowDC. The following describes the differences between
- these device contexts and when you should use them.
-
-
- @b wxScreenDC. Use this to paint on the screen, as opposed to an individual window.
- @b wxClientDC. Use this to paint on the client area of window (the part without
- borders and other decorations), but do not use it from within an #wxPaintEvent.
- @b wxPaintDC. Use this to paint on the client area of a window, but @e only from
- within a #wxPaintEvent.
- @b wxWindowDC. Use this to paint on the whole area of a window, including decorations.
- This may not be available on non-Windows platforms.
-
-
+ This is @true of #wxScreenDC, #wxClientDC, #wxPaintDC, and #wxWindowDC.
+ The following describes the differences between these device contexts and
+ when you should use them.
+
+ @li @b wxScreenDC. Use this to paint on the screen, as opposed to an individual window.
+ @li @b wxClientDC. Use this to paint on the client area of window (the part without
+ borders and other decorations), but do not use it from within an #wxPaintEvent.
+ @li @b wxPaintDC. Use this to paint on the client area of a window, but @e only from
+ within a #wxPaintEvent.
+ @li @b wxWindowDC. Use this to paint on the whole area of a window, including decorations.
+ This may not be available on non-Windows platforms.
+
To use a client, paint or window device context, create an object on the stack with
the window as argument, for example:
-
+
@code
- void MyWindow::OnMyCmd(wxCommandEvent& event)
+ void MyWindow::OnMyCmd(wxCommandEvent& event)
{
wxClientDC dc(window);
DrawMyPicture(dc);
}
@endcode
-
+
Try to write code so it is parameterised by wxDC - if you do this, the same piece of code may
write to a number of different devices, by passing a different device context. This doesn't
work for everything (for example not all device contexts support bitmap drawing) but
will work most of the time.
-
- */
-
-
+
+*/
+