start refactoring pong entities to use classes

src/paddle.cpp

@@ -0,0 +1,32 @@
+#include <stdint.h>
+#include "config.h"
+
+class Paddle {
+
+  private:
+    // define player coordinates
+    uint8_t _position, _height;
+    bool _human;
+
+  public:
+    void move_pad_up(bool &need_refresh) {
+      if (_position > 0) {
+        _position -= 1;
+        need_refresh= true;
+      }
+    }
+    void move_pad_down(bool &need_refresh) {
+      if (_position + _height <= MATRIX_HEIGHT) {
+        _position += 1;
+        need_refresh= true;
+      }
+    }
+
+    uint8_t get_position() {
+      return _position;
+    }
+
+    bool is_human() {
+      return _human;
+    }
+};