Added more wxRegion tests to erase sample.

Implemented "clear now, paint later".
  Corrected colour-by-name lookup.
  Corrected DrawRectangle code which produced
    redraw garbage under wxX11.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14297 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/erase/erase.cpp

@@ -188,6 +188,18 @@ void MyCanvas::OnPaint( wxPaintEvent &event )
     
     dc.SetBrush( *wxRED_BRUSH );
     dc.DrawRectangle( 100, 100, 200, 200 );
+    
+    dc.DestroyClipingRegion();
+
+    dc.SetPen( *wxTRANSPARENT_PEN );
+    
+    wxRegion strip( 110, 200, 30, 1 );
+    wxRegionIterator it( strip );
+    while (it)
+    {
+        dc.DrawRectangle( it.GetX(), it.GetY(), it.GetWidth(), it.GetHeight() );
+        it ++;
+    }
 }
 
 void MyCanvas::OnEraseBackground( wxEraseEvent &event )