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Small correction to erase sample, added PrepareDC()

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to erase background handler.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31995 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robert Roebling
2005-02-13 14:36:15 +00:00
parent 6e38077e6c
commit ca37cfde6a
1 changed files with 8 additions and 4 deletions
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12
samples/erase/erase.cpp
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@@ -198,6 +198,8 @@ MyCanvas::MyCanvas( wxFrame *parent )
m_bitmap = wxBitmap( wxICON(mondrian) ); m_bitmap = wxBitmap( wxICON(mondrian) );
new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) ); new wxStaticBitmap( this, wxID_ANY, m_bitmap, wxPoint(80,20) );
SetFocusIgnoringChildren();
} }
void MyCanvas::OnChar( wxKeyEvent &event ) void MyCanvas::OnChar( wxKeyEvent &event )
@@ -226,7 +228,7 @@ void MyCanvas::OnChar( wxKeyEvent &event )
void MyCanvas::DoPaint(wxDC& dc) void MyCanvas::DoPaint(wxDC& dc)
{ {
dc.SetBrush( *wxBLACK_BRUSH ); dc.SetBrush( *wxBLACK_BRUSH );
dc.DrawRectangle( 0,0,200,50 ); dc.DrawRectangle( 10,10,200,50 );
dc.DrawBitmap( m_bitmap, 10, 20, true ); dc.DrawBitmap( m_bitmap, 10, 20, true );
@@ -317,21 +319,23 @@ void MyCanvas::OnEraseBackground( wxEraseEvent& event )
wxDC& dc = *event.GetDC(); wxDC& dc = *event.GetDC();
dc.SetPen(*wxGREEN_PEN); dc.SetPen(*wxGREEN_PEN);
PrepareDC( dc );
// clear any junk currently displayed // clear any junk currently displayed
dc.Clear(); dc.Clear();
const wxSize size = GetClientSize(); const wxSize size = GetClientSize();
for ( int x = 0; x < size.x; x += 10 ) for ( int x = 0; x < size.x; x += 15 )
{ {
dc.DrawLine(x, 0, x, size.y); dc.DrawLine(x, 0, x, size.y);
} }
for ( int y = 0; y < size.y; y += 10 ) for ( int y = 0; y < size.y; y += 15 )
{ {
dc.DrawLine(0, y, size.x, y); dc.DrawLine(0, y, size.x, y);
} }
dc.SetTextForeground(*wxRED); dc.SetTextForeground(*wxRED);
dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 60); dc.DrawText(_T("This text is drawn from OnEraseBackground"), 60, 160);
} }