diff --git a/MiRCARTCanvas.py b/MiRCARTCanvas.py
index 0503889..cb09834 100644
--- a/MiRCARTCanvas.py
+++ b/MiRCARTCanvas.py
@@ -221,6 +221,7 @@ class MiRCARTCanvas(wx.Panel):
 
         super().__init__(parent, pos=canvasPos, \
             size=[w*h for w,h in zip(canvasSize, cellSize)])
+        self.SetDoubleBuffered(True)
         self.Bind(wx.EVT_CLOSE, self.onClose)
         self.Bind(wx.EVT_ENTER_WINDOW, self.onMouseWindowEvent)
         self.Bind(wx.EVT_LEAVE_WINDOW, self.onMouseWindowEvent)
diff --git a/MiRCARTCanvasJournal.py b/MiRCARTCanvasJournal.py
index 3b70dbc..de9511d 100644
--- a/MiRCARTCanvasJournal.py
+++ b/MiRCARTCanvasJournal.py
@@ -60,7 +60,10 @@ class MiRCARTCanvasJournal():
                 self._popTmp(eventDc, tmpDc)
             for patch in mapPatch[1]:
                 absMapPoint = self._relMapPointToAbsMapPoint(patch[0], atPoint)
-                if mapPatchTmp:
+                if absMapPoint[0] >= self.parentCanvas.canvasSize[0]    \
+                or absMapPoint[1] >= self.parentCanvas.canvasSize[1]:
+                    continue
+                elif mapPatchTmp:
                     self._pushTmp(absMapPoint)
                     self.parentCanvas.onJournalUpdate(mapPatchTmp,      \
                         absMapPoint, patch, eventDc, tmpDc, atPoint)
diff --git a/MiRCARTFrame.py b/MiRCARTFrame.py
index 5cd5321..368d9c0 100644
--- a/MiRCARTFrame.py
+++ b/MiRCARTFrame.py
@@ -340,9 +340,14 @@ class MiRCARTFrame(MiRCARTGeneralFrame):
         elif cid == self.CID_DELETE[0]:
             pass
         elif cid == self.CID_INCRBRUSH[0]:
-            pass
-        elif cid == self.CID_DECRBRUSH[0]:
-            pass
+            self.panelCanvas.brushSize =    \
+                [a+1 for a in self.panelCanvas.brushSize]
+            print(self.panelCanvas.brushSize)
+        elif cid == self.CID_DECRBRUSH[0]   \
+        and  self.panelCanvas.brushSize != [0,0]:
+            self.panelCanvas.brushSize =    \
+                [a-1 for a in self.panelCanvas.brushSize]
+            print(self.panelCanvas.brushSize)
         elif cid == self.CID_SOLID_BRUSH[0]:
             pass
         elif cid == self.CID_RECT[0]:
@@ -351,7 +356,7 @@ class MiRCARTFrame(MiRCARTGeneralFrame):
             pass
         elif cid == self.CID_LINE[0]:
             pass
-        elif cid >= self.CID_COLOUR00[0]                                    \
+        elif cid >= self.CID_COLOUR00[0]    \
         and  cid <= self.CID_COLOUR15[0]:
             numColour = cid - self.CID_COLOUR00[0]
             if event.GetEventType() == wx.wxEVT_TOOL:
diff --git a/MiRCARTToolRect.py b/MiRCARTToolRect.py
index 71e226d..66a8864 100644
--- a/MiRCARTToolRect.py
+++ b/MiRCARTToolRect.py
@@ -33,14 +33,18 @@ class MiRCARTToolRect(MiRCARTTool):
         brushColours = brushColours.copy()
         if isLeftDown:
             brushColours[1] = brushColours[0]
-            return [[False, [[[0, 0], brushColours, 0, " "]]],  \
-                    [True,  [[[0, 0], brushColours, 0, " "]]]]
         elif isRightDown:
             brushColours[0] = brushColours[1]
-            return [[False, [[[0, 0], brushColours, 0, " "]]],  \
-                    [True,  [[[0, 0], brushColours, 0, " "]]]]
         else:
             brushColours[1] = brushColours[0]
-            return [[True, [[[0, 0], brushColours, 0, " "]]]]
+        brushPatches = []
+        for brushRow in range(brushSize[1]):
+            for brushCol in range(brushSize[0] * 2):
+                brushPatches.append([[brushCol, brushRow],  \
+                    brushColours, 0, " "])
+        if isLeftDown or isRightDown:
+            return [[False, brushPatches], [True, brushPatches]]
+        else: 
+            return [[True, brushPatches]]
 
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