X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/a660d684eda27638bca0384b2058911a31c8e845..1a87edf286921de9b182f3d19adb6bb63ba85ebd:/docs/latex/wx/memorydc.tex?ds=sidebyside diff --git a/docs/latex/wx/memorydc.tex b/docs/latex/wx/memorydc.tex index 5237bb765a..8f4c510d2b 100644 --- a/docs/latex/wx/memorydc.tex +++ b/docs/latex/wx/memorydc.tex @@ -1,12 +1,20 @@ \section{\class{wxMemoryDC}}\label{wxmemorydc} -A memory device context provides a means to draw graphics onto a bitmap. +A memory device context provides a means to draw graphics onto a bitmap. When +drawing in to a mono-bitmap, using {\tt wxWHITE}, {\tt wxWHITE\_PEN} and +{\tt wxWHITE\_BRUSH} +will draw the background colour (i.e. 0) whereas all other colours will draw the +foreground colour (i.e. 1). \wxheading{Derived from} \helpref{wxDC}{wxdc}\\ \helpref{wxObject}{wxobject} +\wxheading{Include files} + + + \wxheading{Remarks} A bitmap must be selected into the new memory DC before it may be used @@ -31,24 +39,24 @@ can be reselected into another memory DC. \latexignore{\rtfignore{\wxheading{Members}}} -\membersection{wxMemoryDC::wxMemoryDC} +\membersection{wxMemoryDC::wxMemoryDC}\label{wxmemorydcctor} \func{}{wxMemoryDC}{\void} Constructs a new memory device context. Use the {\it Ok} member to test whether the constructor was successful -in creating a useable device context. Don't forget to select a bitmap +in creating a usable device context. Don't forget to select a bitmap into the DC before drawing on it. -\membersection{wxMemoryDC::SelectObject} +\membersection{wxMemoryDC::SelectObject}\label{wxmemorydcselectobject} -\func{}{SelectObject}{\param{const wxBitmap\& }{bitmap}} +\func{void}{SelectObject}{\param{const wxBitmap\& }{bitmap}} Selects the given bitmap into the device context, to use as the memory bitmap. Selecting the bitmap into a memory DC allows you to draw into the DC (and therefore the bitmap) and also to use {\bf Blit} to copy -the bitmap to a canvas. For this purpose, you may find \helpref{wxDC::DrawIcon}{wxdcdrawicon}\rtfsp +the bitmap to a window. For this purpose, you may find \helpref{wxDC::DrawIcon}{wxdcdrawicon}\rtfsp easier to use instead. If the argument is wxNullBitmap (or some other uninitialised wxBitmap) the current bitmap is selected out of the device