1 files changed, 16 insertions, 7 deletions
diff --git a/src/lua/graphics/luaopen_Canvas.cpp b/src/lua/graphics/luaopen_Canvas.cpp
index edcd1ae..88d6e09 100644
--- a/src/lua/graphics/luaopen_Canvas.cpp
+++ b/src/lua/graphics/luaopen_Canvas.cpp
@@ -1,28 +1,36 @@
 #include "libs/luax/luax.h"
 #include "../luaopen_types.h"
 #include "render/canvas.h"
-using namespace jin::render;
+
 namespace jin
 {
 namespace lua
 {
+
+    using namespace jin::render;
+
+    static inline Canvas* checkCanvas(lua_State* L)
+    {
+        return (Canvas*)luax_checktype(L, 1, TYPE_CANVAS);
+    }
+
     static int l_getWidth(lua_State* L)
     {
-        Canvas* c = (Canvas*)luax_checktype(L, 1, TYPE_CANVAS);
+        Canvas* c = checkCanvas(L);
         luax_pushnumber(L, c->getWidth());
         return 1;
     }
 
     static int l_getHeight(lua_State* L)
     {
-        Canvas* c = (Canvas*)luax_checktype(L, 1, TYPE_CANVAS);
+        Canvas* c = checkCanvas(L);
         luax_pushnumber(L, c->getHeight());
         return 1;
     }
 
     static int l_getSize(lua_State* L)
     {
-        Canvas* c = (Canvas*)luax_checktype(L, 1, TYPE_CANVAS);
+        Canvas* c = checkCanvas(L);
         luax_pushnumber(L, c->getWidth());
         luax_pushnumber(L, c->getHeight());
         return 2;
@@ -30,7 +38,7 @@ namespace lua
 
     static int l_setAnchor(lua_State* L)
     {
-        Canvas* c = (Canvas*)luax_checktype(L, 1, TYPE_CANVAS);
+        Canvas* c = checkCanvas(L);
         int x = luax_checknumber(L, 1); 
         int y = luax_checknumber(L, 2);
         c->setAnchor(x, y);
@@ -57,5 +65,6 @@ namespace lua
         luax_newtype(L, TYPE_CANVAS, f);
         return 0;
     }
-}
-}
-\ No newline at end of file
+
+}// lua
+}// jin 
+\ No newline at end of file