添加了获得公交车在画布中位置的函数

include/mainScene.h

@@ -8,10 +8,19 @@
 #include "QGraphicsScene"
 #include "QGraphicsPixmapItem"
 
+/**
+ * 储存每个站点位置的类
+ */
 class PosPair{
 
 public:
+    /*
+     * 站点位置的x坐标
+     */
     int pos_x;
+    /**
+     * 站点位置的y坐标
+     */
     int pos_y;
 
     PosPair();
@@ -21,17 +30,31 @@ public:
      * @return 站点之间的距离
      */
     int GetStopSpaceLength(int stop_number) const;
+
     /**
      * 加上一定的距离
      * @param length 需要加上的距离
      */
     void AddLength(int length);
 
+    /**
+     * 获得该站点公交车停车的位置x坐标
+     * @return
+     */
+    int GetBusPosX() const;
+
+    /**
+     * 获得该站点公交车停车位置的y坐标
+     * @return
+     */
+    int GetBusPosY() const;
+
 private:
     const int stop_begin_x = 100;
     const int stop_begin_y = 80;
     const int stop_rail_width = 300;
     const int stop_rail_height = 200;
+    const int stop_bus_distance = 20;
 
     int distance = 0;
 };

src/mainScene.cpp

@@ -25,7 +25,7 @@ SceneManager::~SceneManager()
 
 void SceneManager::SetStopScene(int node_number)
 {
-    // 先清除以下屏幕
+    // 先清除屏幕
     ClearScene();
 
     stop_node_number = node_number;
@@ -117,3 +117,43 @@ void PosPair::AddLength(int length)
         pos_x = stop_begin_x + distance;
     }
 }
+
+int PosPair::GetBusPosX() const
+{
+    int result;
+
+    if(pos_x <= stop_begin_x)
+    {
+        result = stop_begin_x - stop_bus_distance;
+    }
+    else if(pos_x >= stop_begin_x + stop_rail_width)
+    {
+        result = pos_x + stop_bus_distance;
+    }
+    else
+    {
+        result = pos_x;
+    }
+
+    return result;
+}
+
+int PosPair::GetBusPosY() const
+{
+    int result;
+
+    if(pos_y <= stop_begin_y)
+    {
+        result = stop_begin_y - stop_bus_distance;
+    }
+    else if(pos_y >= stop_begin_y + stop_rail_width)
+    {
+        result = pos_y + stop_bus_distance;
+    }
+    else
+    {
+        result = pos_y;
+    }
+
+    return result;
+}