fix a bug: creating a box with one point

libs/canvas.py

@@ -245,9 +245,9 @@ class Canvas(QWidget):
             self.current.addPoint(targetPos)
             self.current.addPoint(QPointF(minX, maxY))
             self.current.addPoint(initPos)
+            self.current.close()
             self.line[0] = self.current[-1]
-            if self.current.isClosed():
-                self.finalise()
+            self.finalise()
         elif not self.outOfPixmap(pos):
             self.current = Shape()
             self.current.addPoint(pos)

libs/shape.py

@@ -67,9 +67,7 @@ class Shape(object):
         return False
 
     def addPoint(self, point):
-        if self.points and point == self.points[0]:
-            self.close()
-        else:
+        if not self.reachMaxPoints():
             self.points.append(point)
 
     def popPoint(self):