5 files changed, 11 insertions, 10 deletions
diff --git a/tracker-easy/frame.cpp b/tracker-easy/frame.cpp
index b066e13b..9243c6a1 100644
--- a/tracker-easy/frame.cpp
+++ b/tracker-easy/frame.cpp
@@ -50,9 +50,9 @@ QImage Preview::get_bitmap()
                   QImage::Format_ARGB32);
 }
 
-void Preview::draw_head_center(pt_pixel_pos_mixin::f x, pt_pixel_pos_mixin::f y)
+void Preview::draw_head_center(Coordinates::f x, Coordinates::f y)
 {
-    auto [px_, py_] = pt_pixel_pos_mixin::to_pixel_pos(x, y, frame_copy.cols, frame_copy.rows);
+    auto [px_, py_] = Coordinates::to_pixel_pos(x, y, frame_copy.cols, frame_copy.rows);
 
     int px = iround(px_), py = iround(py_);
 
diff --git a/tracker-easy/frame.hpp b/tracker-easy/frame.hpp
index 807f74d2..01e99977 100644
--- a/tracker-easy/frame.hpp
+++ b/tracker-easy/frame.hpp
@@ -13,7 +13,7 @@ struct Preview
 
     Preview& operator=(const cv::Mat& frame);
     QImage get_bitmap();
-    void draw_head_center(pt_pixel_pos_mixin::f x, pt_pixel_pos_mixin::f y);
+    void draw_head_center(Coordinates::f x, Coordinates::f y);
 
     operator cv::Mat&() { return frame_copy; }
     operator cv::Mat const&() const { return frame_copy; }
diff --git a/tracker-easy/point_extractor.cpp b/tracker-easy/point_extractor.cpp
index 54803d52..ecd72f70 100644
--- a/tracker-easy/point_extractor.cpp
+++ b/tracker-easy/point_extractor.cpp
@@ -372,7 +372,7 @@ end:
         // note: H/W is equal to fx/fy
 
         vec2 p;
-        std::tie(p[0], p[1]) = to_screen_pos(b.pos[0], b.pos[1], W, H);
+        std::tie(p[0], p[1]) = Coordinates::to_screen_pos(b.pos[0], b.pos[1], W, H);
         points.push_back(p);
         imagePoints.push_back(vec2(b.pos[0], b.pos[1]));
     }
diff --git a/tracker-easy/tracker-easy-api.cpp b/tracker-easy/tracker-easy-api.cpp
index 32663a6a..aaeb0631 100644
--- a/tracker-easy/tracker-easy-api.cpp
+++ b/tracker-easy/tracker-easy-api.cpp
@@ -22,12 +22,12 @@ f pt_point_extractor::threshold_radius_value(int w, int h, int threshold)
     return radius;
 }
 
-std::tuple<f, f> pt_pixel_pos_mixin::to_pixel_pos(f x, f y, int w, int h)
+std::tuple<f, f> Coordinates::to_pixel_pos(f x, f y, int w, int h)
 {
     return std::make_tuple(w*(x+f{.5}), f{.5}*(h - 2*y*w));
 }
 
-std::tuple<f, f> pt_pixel_pos_mixin::to_screen_pos(f px, f py, int w, int h)
+std::tuple<f, f> Coordinates::to_screen_pos(f px, f py, int w, int h)
 {
     px *= w/(w-f{1}); py *= h/(h-f{1});
     return std::make_tuple((px - w/f{2})/w, -(py - h/f{2})/w);
diff --git a/tracker-easy/tracker-easy-api.h b/tracker-easy/tracker-easy-api.h
index b42e4c73..40e472d4 100644
--- a/tracker-easy/tracker-easy-api.h
+++ b/tracker-easy/tracker-easy-api.h
@@ -22,8 +22,10 @@
 
 const int KPointCount = 3;
 
-
-struct pt_pixel_pos_mixin
+///
+/// Utility class providing coordinates conversion functionalities
+///
+struct Coordinates final
 {
     using f = numeric_types::f;
 
@@ -32,8 +34,7 @@ struct pt_pixel_pos_mixin
 };
 
 
-
-struct pt_point_extractor : pt_pixel_pos_mixin
+struct pt_point_extractor
 {
     using vec2 = numeric_types::vec2;
     using f = numeric_types::f;