diff --git a/libs/canvas.py b/libs/canvas.py
index f7c7a4f2..b1cea058 100644
--- a/libs/canvas.py
+++ b/libs/canvas.py
@@ -551,6 +551,47 @@ class Canvas(QWidget):
             self.update()
         elif key == Qt.Key_Return and self.canCloseShape():
             self.finalise()
+        elif key == Qt.Key_Left and self.selectedShape:
+            self.moveOnePixel('Left')
+        elif key == Qt.Key_Right and self.selectedShape:
+            self.moveOnePixel('Right')
+        elif key == Qt.Key_Up and self.selectedShape:
+            self.moveOnePixel('Up')
+        elif key == Qt.Key_Down and self.selectedShape:
+            self.moveOnePixel('Down')
+
+    def moveOnePixel(self, direction):
+        # print(self.selectedShape.points)
+        if direction == 'Left' and not self.moveOutOfBound(QPointF(-1.0, 0)):
+            print("move Left one pixel")
+            self.selectedShape.points[0] += QPointF(-1.0, 0)
+            self.selectedShape.points[1] += QPointF(-1.0, 0)
+            self.selectedShape.points[2] += QPointF(-1.0, 0)
+            self.selectedShape.points[3] += QPointF(-1.0, 0)
+        elif direction == 'Right' and not self.moveOutOfBound(QPointF(1.0, 0)):
+            print("move Right one pixel")
+            self.selectedShape.points[0] += QPointF(1.0, 0)
+            self.selectedShape.points[1] += QPointF(1.0, 0)
+            self.selectedShape.points[2] += QPointF(1.0, 0)
+            self.selectedShape.points[3] += QPointF(1.0, 0)
+        elif direction == 'Up' and not self.moveOutOfBound(QPointF(0, -1.0)):
+            print("move Up one pixel")
+            self.selectedShape.points[0] += QPointF(0, -1.0)
+            self.selectedShape.points[1] += QPointF(0, -1.0)
+            self.selectedShape.points[2] += QPointF(0, -1.0)
+            self.selectedShape.points[3] += QPointF(0, -1.0)
+        elif direction == 'Down' and not self.moveOutOfBound(QPointF(0, 1.0)):
+            print("move Down one pixel")
+            self.selectedShape.points[0] += QPointF(0, 1.0)
+            self.selectedShape.points[1] += QPointF(0, 1.0)
+            self.selectedShape.points[2] += QPointF(0, 1.0)
+            self.selectedShape.points[3] += QPointF(0, 1.0)
+        self.shapeMoved.emit()
+        self.repaint()
+
+    def moveOutOfBound(self, step):
+        points = [p1+p2 for p1, p2 in zip(self.selectedShape.points, [step]*4)]
+        return True in map(self.outOfPixmap, points)
 
     def setLastLabel(self, text):
         assert text