From: Antonio Ospite <ao2@ao2.it>
Date: Fri, 3 Oct 2014 13:45:09 +0000 (+0200)
Subject: Clarify why a self.dc is needed in CanvasView.py
X-Git-Url: https://git.ao2.it/PoPiPaint.git/commitdiff_plain/40248e4828b39d46e4832ce7a425d794ecc9558f?ds=sidebyside

Clarify why a self.dc is needed in CanvasView.py
---

diff --git a/CanvasView.py b/CanvasView.py
index e91902e..bbac60b 100755
--- a/CanvasView.py
+++ b/CanvasView.py
@@ -73,12 +73,10 @@ class CanvasView(wx.Window):
 
         self.Bind(wx.EVT_PAINT, self.OnPaint)
 
-        # make a DC to draw into...
-        self.buffer = wx.EmptyBitmap(w, h)
-        self.dc = wx.BufferedDC(None, self.buffer)
-
-        # Because we want the position of the mouse pointer
-        # relative to the center of the canvas
+        # Have a reference DC with the desired coordinate system.
+        # Because we want the position of the mouse pointer relative to the
+        # center of this canvas.
+        self.dc = wx.MemoryDC(wx.EmptyBitmap(w, h))
         self.dc.SetDeviceOrigin(w/2., h/2.)
 
         self.draw_grid = True