added helper functions and fixed inverted width and height

include/genimg/drawing.hh

@@ -4,7 +4,9 @@
 #include <opencv2/core/core.hpp>
 #include <opencv2/highgui/highgui.hpp>
 
-void draw_square(cv::Mat &t_img, cv::Point const &t_top_left, int const size,
-                 cv::Scalar const &t_color);
+enum class Shapes { Square, Circle };
+
+void draw_shape(cv::Mat &t_img, cv::Point const &t_top_left, int const t_size,
+                cv::Scalar const &t_color, Shapes const &t_shape);
 
 #endif /* GENETIC_IMAGE_INCLUDE_GENIMG_DRAWING_HH_ */