added ReserveDirection

example/common/VulkanAppFramework.h

@@ -378,7 +378,9 @@ class CameraMouseControl:public MouseEvent
     Vector2f mouse_pos;
     Vector2f mouse_last_pos;
 
-protected:    
+    Vector2f ReverseDirection;
+
+protected:
 
     bool OnPressed(int x,int y,MouseButton) override
     {
@@ -409,6 +411,8 @@ protected:
         
         Vector2f pos(x,y);
         Vector2f gap=pos-mouse_last_pos;
+
+        gap*=ReverseDirection;
         
         if(left)
         {
@@ -436,6 +440,15 @@ public:
     {
         camera=wc;
         cur_time=0;
+
+        ReverseDirection.x=1;
+        ReverseDirection.y=1;
+    }
+
+    void SetReserveDirection(bool x,bool y)
+    {
+        ReverseDirection.x=x?-1:1;
+        ReverseDirection.y=y?-1:1;
     }
 
     const Vector2f &GetMouseCoord()const{return mouse_pos;}
@@ -448,7 +461,6 @@ public:
 
 class CameraAppFramework:public VulkanApplicationFramework
 {
-
 protected:
 
     Camera *                camera                      =nullptr;