start refactoring pong entities to use classes

src/engine.cpp

@@ -0,0 +1,69 @@
+#include <Arduino.h>
+#include "ball.h"
+#include "paddle.h"
+#include "config.h"
+
+class Engine {
+
+  private:
+    Paddle& _p1;
+    Paddle& _p2;
+    Ball& _ball;
+    uint8_t _p1_score, _p2_score;
+    uint8_t _hits;
+
+    bool _check_pad_ball_collision(Paddle &p1, Ball &ball) {
+      return false;
+    }
+
+    void point_scored(Ball &ball) {
+      ball.reset_position();
+
+      Serial.print("P1: ");
+      Serial.print(_p1_score);
+      Serial.print(" - ");
+      Serial.print("P2: ");
+      Serial.print(_p2_score);
+      Serial.println();
+
+      _hits= 0;
+      // ball_delay= INITIAL_BALL_DELAY;
+    }
+
+  public:
+    // inizialize Engine constructor, linking all args with private args
+    Engine(Paddle &p_one, Paddle &p_two, Ball &ball): _p1(p_one), _p2(p_two), _ball(ball) {}
+
+    void run(uint8_t &ball_delay) {
+      _ball.move();
+      uint8_t bx= _ball.get_x();
+      uint8_t by= _ball.get_y();
+
+      if (bx == 0) {
+        if (!_check_pad_ball_collision(_p1, _ball)) {
+          // p2 scores
+          _p2_score +=1;
+          Serial.println("Player 2 Scores");
+        }
+        else {
+          _hits += 1;
+          _ball.bounce_on_pad();
+        }
+      }
+      else if (bx >= MATRIX_WIDTH-1) {
+        if (!_check_pad_ball_collision(_p2, _ball)) {
+          // p1 scores
+          _p1_score += 1;
+          Serial.println("Player 1 Scores");
+        }
+      }
+
+      if (by == 0 || by == MATRIX_HEIGHT-1) _ball.bounce_on_sides();
+
+      if (_hits >= 6 && ball_delay >= 80) {
+        // increase ball speed
+        _hits= 0;
+        ball_delay-= 20;
+      }
+    }
+};