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document that text drawing is not affected by the current logical function and update the sample to not imply that it is (#9842)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55156 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2008-08-21 21:14:58 +00:00
parent 08de440369
commit e928566f7d
2 changed files with 8 additions and 9 deletions
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7
interface/wx/dc.h
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@ -445,10 +445,8 @@ public:
the string. See GetTextExtent() for how to get the dimensions of a text
string, which can be used to position the text more precisely.
@note Under wxGTK, the current
@ref GetLogicalFunction() "logical function" is used by this
function but it is ignored by wxMSW. Thus, you should avoid using
logical functions with this function in portable programs.
@note The current @ref GetLogicalFunction() "logical function" is
ignored by this function.
*/
void DrawText(const wxString& text, wxCoord x, wxCoord y);
@ -911,6 +909,7 @@ public:
determines how a source pixel (from a pen or brush colour, or source
device context if using Blit()) combines with a destination pixel in
the current device context.
Text drawing is not affected by this function.
The possible values and their meaning in terms of source and
destination pixel values are as follows:

10
samples/drawing/drawing.cpp
View File

@ -811,20 +811,20 @@ void MyCanvas::DrawText(wxDC& dc)
// test the logical function effect
wxCoord y = 150;
dc.SetLogicalFunction(wxINVERT);
dc.DrawText( _T("There should be no text below"), 110, 150 );
// text drawing should ignore logical function
dc.DrawText( _T("There should be a text below"), 110, 150 );
dc.DrawRectangle( 110, y, 100, height );
// twice drawn inverted should result in invisible
y += height;
dc.DrawText( _T("Invisible text"), 110, y );
dc.DrawText( _T("Visible text"), 110, y );
dc.DrawRectangle( 110, y, 100, height );
dc.DrawText( _T("Invisible text"), 110, y );
dc.DrawText( _T("Visible text"), 110, y );
dc.DrawRectangle( 110, y, 100, height );
dc.SetLogicalFunction(wxCOPY);
y += height;
dc.DrawRectangle( 110, y, 100, height );
dc.DrawText( _T("Visible text"), 110, y );
dc.DrawText( _T("Another visible text"), 110, y );
}
static const struct