+ void GetNaturalSize( const v8::FunctionCallbackInfo< v8::Value >& args );
+ void GetWidthForHeight( const v8::FunctionCallbackInfo<v8::Value>& args );
+ void GetHeightForWidth( const v8::FunctionCallbackInfo<v8::Value>& args );
+ void TranslateBy( const v8::FunctionCallbackInfo< v8::Value >& args );