New functions like batch move, delete, withdraw with redundant codes

PPOCRLabel/libs/shape.py

@@ -82,8 +82,11 @@ class Shape(object):
         return False
 
     def addPoint(self, point):
-        if not self.reachMaxPoints():
-            self.points.append(point)
+        if not self.reachMaxPoints():  # 4个点时发出close信号
+            if self.points and point == self.points[0]:
+                self.close()
+            else:
+                self.points.append(point)
 
     def popPoint(self):
         if self.points:

PPOCRLabel/resources/strings/strings-zh-CN.properties

@@ -96,4 +96,7 @@ hideBox=隐藏所有标注
 showBox=显示所有标注
 saveLabel=保存标记结果
 singleRe=重识别此区块
-labelDialogOption=弹出标记输入框
+labelDialogOption=弹出标记输入框
+undo=撤销
+undoLastPoint=撤销上个点
+autoSaveMode=自动保存标记结果

PPOCRLabel/resources/strings/strings.properties

@@ -96,4 +96,7 @@ hideBox=Hide All Box
 showBox=Show All Box
 saveLabel=Save Label
 singleRe=Re-recognition RectBox
-labelDialogOption=Pop-up Label Input Dialog
+labelDialogOption=Pop-up Label Input Dialog
+undo=Undo
+undoLastPoint=Undo Last Point
+autoSaveMode=Auto Save Label Mode