From fb5d5ca95ed74d18ef1a99a2344a1ce9bae8013b Mon Sep 17 00:00:00 2001
From: yatengLG <767624851@qq.com>
Date: Thu, 10 Aug 2023 14:41:40 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=AF=E6=8C=81=E8=B0=83=E6=95=B4=E9=A1=B6?=
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---
 example/images/isat.yaml |  4 ++++
 widgets/canvas.py        | 10 +++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/example/images/isat.yaml b/example/images/isat.yaml
index fc38e77..9b725dd 100644
--- a/example/images/isat.yaml
+++ b/example/images/isat.yaml
@@ -1,3 +1,4 @@
+contour_mode: external
 label:
 - color: '#000000'
   name: __background__
@@ -19,3 +20,6 @@ label:
   name: cake
 - color: '#5c3566'
   name: fence
+language: en
+mask_alpha: 0.4
+vertex_size: 2
diff --git a/widgets/canvas.py b/widgets/canvas.py
index 490bd31..b6e12ad 100644
--- a/widgets/canvas.py
+++ b/widgets/canvas.py
@@ -307,8 +307,16 @@ class AnnotationScene(QtWidgets.QGraphicsScene):
                 deleted_layer = item.zValue()
                 del item
             elif isinstance(item, Vertex):
-                index = item.polygon.vertexs.index(item)
+                polygon = item.polygon
+                index = polygon.vertexs.index(item)
                 item.polygon.removePoint(index)
+                # 如果剩余顶点少于三个，删除多边形
+                if len(polygon.vertexs) < 3:
+                    self.mainwindow.polygons.remove(polygon)
+                    polygon.delete()
+                    self.removeItem(polygon)
+                    deleted_layer = polygon.zValue()
+                    del polygon
 
         if deleted_layer is not None:
             for p in self.mainwindow.polygons: