added wxRect::CentreIn()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37435 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gdicmn.h

@@ -428,6 +428,20 @@ public:
     }
 
 
+    // centre this rectangle in the given (usually, but not necessarily,
+    // larger) one
+    wxRect CentreIn(const wxRect& r, int dir = wxBOTH) const
+    {
+        return wxRect(dir & wxHORIZONTAL ? r.x + (r.width - width)/2 : x,
+                      dir & wxVERTICAL ? r.y + (r.height - height)/2 : y,
+                      width, height);
+    }
+
+    wxRect CenterIn(const wxRect& r, int dir = wxBOTH) const
+    {
+        return CentreIn(r, dir);
+    }
+
 public:
     int x, y, width, height;
 };