Type PaintDC

object --+                
         |                
    Object --+            
             |            
            DC --+        
                 |        
          WindowDC --+    
                     |    
              ClientDC --+
                         |
                        PaintDC

A wx.PaintDC must be constructed if an application wishes to paint on the client area of a window from within an EVT_PAINT event handler. This should normally be constructed as a temporary stack object; don't store a wx.PaintDC object. If you have an EVT_PAINT handler, you must create a wx.PaintDC object within it even if you don't actually use it.

Using wx.PaintDC within EVT_PAINT handlers is important because it automatically sets the clipping area to the damaged area of the window. Attempts to draw outside this area do not appear.

To draw on a window from outside EVT_PAINT handlers, construct a wx.ClientDC object.