select difficulty level (when play against bot) using a dedicated frame to show a graphics menu

pvp, pvc, cvc

arduino_pong.ino

@@ -21,24 +21,42 @@ byte frame[MATRIX_HEIGHT][MATRIX_WIDTH] = {
 
 ArduinoLEDMatrix matrix;
 
-int need_refresh= true;
+bool need_refresh= true;
 uint8_t hits= 0;
 long exec_t2= millis();
 
 enum game_statuses : uint8_t {
+  MENU,
+  MENU_BOT_SKILLS,
   TIMER,
   RUN,
   SCORE,
   GAMEOVER,
   WAIT,
 };
-game_statuses game_status= TIMER;
+game_statuses game_status= MENU;
+
+enum game_modes : uint8_t {PVP, PVC, CVC};
+game_modes game_mode = PVP;
+
 
 Ball ball(4, 6);
-Paddle p1(1);
-Paddle p2(4);
-Engine engine(p1, p2, ball, INITIAL_BALL_DELAY);
-Renderer renderer(p1, p2, ball, frame, matrix);
+
+Paddle* p1= nullptr;
+Paddle* p2= nullptr;
+HumanPaddle human_pad1(1, P1_BTN_UP, P1_BTN_BOTTOM);
+HumanPaddle human_pad2(4, P2_BTN_UP, P2_BTN_BOTTOM);
+BotPaddle bot_pad1(1, 0);
+BotPaddle bot_pad2(4, MATRIX_WIDTH-1);
+
+uint8_t current_gmode_idx= 0;
+bool update_menu= true;
+bool mode_selected= false;
+uint8_t current_bot_menu_idx= 0;
+bool update_menu_bot_skills= true;
+
+Engine engine(ball, INITIAL_BALL_DELAY);
+Renderer renderer(ball, frame, matrix);
 
 void setup() {
   Serial.begin(9600);
@@ -58,6 +76,84 @@ void loop() {
 
   switch (game_status) {
 
+    case MENU: {
+      if (digitalRead(P2_BTN_BOTTOM) == LOW && current_gmode_idx < sizeof(frame_gmodes)/sizeof(frame_gmodes[0]) -1) {
+        current_gmode_idx += 1;
+        update_menu= true;
+      }
+      else if (digitalRead(P2_BTN_UP) == LOW && current_gmode_idx > 0) {
+        update_menu= true;
+        current_gmode_idx -= 1;
+        game_mode= PVP;
+      }
+
+      // 1. P vs P
+      else if (digitalRead(P1_BTN_UP) == LOW || digitalRead(P1_BTN_BOTTOM) == LOW && game_modes(current_gmode_idx) == PVP) {
+        p1= &human_pad1;
+        p2= &human_pad2;
+        mode_selected= true;
+      }
+      // 2. P vs CPU
+      else if (digitalRead(P1_BTN_UP) == LOW || digitalRead(P1_BTN_BOTTOM) == LOW && game_modes(current_gmode_idx) == PVC) {
+        p1= &human_pad1;
+        p2= &bot_pad2;
+        mode_selected= true;
+        update_menu= false;
+        game_mode= PVC;
+      }
+      // 3. CPU vs CPU
+      else if (digitalRead(P1_BTN_UP) == LOW || digitalRead(P1_BTN_BOTTOM) == LOW && game_modes(current_gmode_idx) == CVC) {
+        p1= &bot_pad1;
+        p2= &bot_pad2;
+        mode_selected= true;
+        update_menu= false;
+        game_mode= CVC;
+      }
+
+      if (update_menu) {
+        // show menu on the matrix
+        const byte (*current_gmode)[12]= frame_gmodes[current_gmode_idx];
+        matrix.loadPixels((uint8_t*)current_gmode, MATRIX_HEIGHT * MATRIX_WIDTH);
+        update_menu= false;
+        delay(300);
+      }
+      else if (mode_selected) {
+        engine.set_players(p1, p2);
+        renderer.set_players(p1, p2);
+        if (game_mode == PVC || game_mode == CVC) {
+          game_status= MENU_BOT_SKILLS;
+          delay(300); // avoid accidental double click for next menu
+        }
+        else game_status= TIMER;
+      }
+      break;
+    }
+
+    case MENU_BOT_SKILLS: {
+      if (digitalRead(P2_BTN_BOTTOM) == LOW && current_bot_menu_idx < sizeof(frame_bot_skills)/sizeof(frame_bot_skills[0]) -1) {
+        current_bot_menu_idx += 1;
+        update_menu_bot_skills= true;
+      }
+      else if (digitalRead(P2_BTN_UP) == LOW && current_bot_menu_idx > 0) {
+        current_bot_menu_idx -= 1;
+        update_menu_bot_skills= true;
+      }
+      else if (digitalRead(P1_BTN_UP) == LOW || digitalRead(P1_BTN_BOTTOM) == LOW) {
+        if (!p1 -> is_human()) p1 -> set_skills(current_bot_menu_idx + 1);
+        if (!p2 -> is_human()) p2 -> set_skills(current_bot_menu_idx + 1);
+        game_status= TIMER;
+        update_menu_bot_skills= false;
+      }
+
+      if (update_menu_bot_skills) {
+        const byte (*current_skill_frame)[12]= frame_bot_skills[current_bot_menu_idx];
+        matrix.loadPixels((uint8_t*)current_skill_frame, MATRIX_HEIGHT * MATRIX_WIDTH);
+        update_menu= false;
+        delay(300);
+      }
+      break;
+    }
+
     case TIMER:
       for (int i = START_TIMER; i >= 0; i--) {
         renderer.render_timer(i);
@@ -69,7 +165,7 @@ void loop() {
       break;
 
     case RUN:
-      need_refresh= check_paddle_movements(p1, p2);
+      need_refresh= engine.control_players();
 
       if (exec_t1 - exec_t2 > engine.ball_movement_delay()) {
         engine.run();
@@ -90,7 +186,7 @@ void loop() {
       renderer.render_score();
       engine.restart_ball();
       delay(1000);
-      if (p1.get_score() >= MAX_POINTS || p2.get_score() >= MAX_POINTS)
+      if (p1 -> get_score() >= MAX_POINTS || p2 -> get_score() >= MAX_POINTS)
         game_status= GAMEOVER;
       else {
         game_status= RUN;
@@ -108,7 +204,8 @@ void loop() {
     case WAIT:
       // keep showing the winner waiting for a restart
       // restart game once one button is pressed
-      if (digitalRead(P1_BTN_UP) == LOW || digitalRead(P1_BTN_BOTTOM) == LOW || digitalRead(P2_BTN_UP) == LOW || digitalRead(P2_BTN_BOTTOM) == LOW) {
+      if (digitalRead(P1_BTN_UP) == LOW || digitalRead(P1_BTN_BOTTOM) == LOW || 
+          digitalRead(P2_BTN_UP) == LOW || digitalRead(P2_BTN_BOTTOM) == LOW) {
         game_status= TIMER;
         engine.reset();
       }

src/ball.cpp

@@ -36,7 +36,9 @@ int8_t Ball::get_direction_y() {
 
 void Ball::reset_position () {
   _x= BALL_RESET_X;
-  _y= BALL_RESET_Y;
+  int8_t delta= random(3);
+  if (random(2) == 0) delta *= -1;
+  _y= BALL_RESET_Y + delta;
   this -> _init_directions(_direction_x);
   this -> _init_directions(_direction_y);
 }

src/engine.cpp

@@ -1,7 +1,7 @@
 #include "engine.h"
 
-bool Engine::_check_pad_ball_collision(Paddle &p) {
-  uint8_t ppos= p.get_position();
+bool Engine::_check_pad_ball_collision(Paddle *p) {
+  uint8_t ppos= p -> get_position();
   for (int p= ppos; p < ppos + PADDLE_LENGTH; p++) {
     if (_ball.get_y() == p) {
       return true;
@@ -29,7 +29,7 @@ void Engine::run() {
     }
     else if (bx <= 0) {
       // p2 scores
-      _p2.increase_score();
+      _p2 -> increase_score();
       _event= P2SCORE;
       return;
     }
@@ -43,7 +43,7 @@ void Engine::run() {
     }
     else if (bx >= MATRIX_WIDTH-1) {
       // p1 scores
-      _p1.increase_score();
+      _p1 -> increase_score();
       _event= P1SCORE;
       return;
     }
@@ -60,6 +60,21 @@ void Engine::run() {
   }
 }
 
+void Engine::set_players(Paddle *p1, Paddle *p2) {
+  _p1= p1;
+  _p2= p2;
+}
+
+bool Engine::control_players() {
+  bool need_refresh= false;
+
+  if (_p1 -> is_human()) need_refresh |= _p1 -> check_pad_movement();
+  else need_refresh |= _p1 -> check_pad_movement(_ball);
+  if (_p2 -> is_human()) need_refresh |= _p2 -> check_pad_movement();
+  else need_refresh |= _p2 -> check_pad_movement(_ball);
+  return need_refresh;
+}
+
 uint8_t Engine::ball_movement_delay() {
   return _ball_mv_delay;
 }
@@ -76,6 +91,6 @@ void Engine::restart_ball() {
 
 void Engine::reset() {
   this -> restart_ball();
-  _p1.reset();
-  _p2.reset();
+  _p1 -> reset();
+  _p2 -> reset();
 }

src/engine.h

@@ -11,21 +11,23 @@ enum EngineEvents : uint8_t {NONE, P1SCORE, P2SCORE, P1_COLLISION, P2_COLLISION,
 class Engine {
 
   private:
-    Paddle& _p1;
-    Paddle& _p2;
+    Paddle* _p1;
+    Paddle* _p2;
     Ball& _ball;
     EngineEvents _event= NONE;
     uint8_t _ball_mv_delay;
     uint8_t _hits = 0;
 
-    bool _check_pad_ball_collision(Paddle &p);
+    bool _check_pad_ball_collision(Paddle *p);
 
   public:
     // inizialize Engine constructor, linking all args with private args
-    Engine(Paddle &p_one, Paddle &p_two, Ball &ball, uint8_t ball_mv_delay)
-        : _p1(p_one), _p2(p_two), _ball(ball), _ball_mv_delay(ball_mv_delay) {}
+    Engine(Ball &ball, uint8_t ball_mv_delay)
+        : _ball(ball), _ball_mv_delay(ball_mv_delay) {}
 
     void run();
+    void set_players(Paddle *p_one, Paddle *p_two);
+    bool control_players();
     uint8_t ball_movement_delay();
     EngineEvents get_event();
     void restart_ball();

src/font.cpp

@@ -0,0 +1,238 @@
+#include "font.h";
+
+const uint32_t pone_wins[5][4] = {
+	{
+		0x78,
+		0xc4847844,
+		0x440e000,
+		500
+	},
+	{
+		0x11,
+		0x1101501,
+		0x501f0000,
+		500
+	},
+	{
+		0xe,
+		0x400400,
+		0x400e0000,
+		500
+	},
+	{
+		0x9,
+		0xd00b00,
+		0x90090000,
+		500
+	},
+	{
+		0xf,
+		0x800f00,
+		0x100f0000,
+		500
+	}
+};
+const uint32_t ptwo_wins[5][4] = {
+	{
+		0x79,
+		0xe48279e4,
+		0x1041e000,
+		500
+	},
+	{
+		0x11,
+		0x1101501,
+		0x501f0000,
+		500
+	},
+	{
+		0xe,
+		0x400400,
+		0x400e0000,
+		500
+	},
+	{
+		0x9,
+		0xd00b00,
+		0x90090000,
+		500
+	},
+	{
+		0xf,
+		0x800f00,
+		0x100f0000,
+		500
+	}
+};
+
+const byte font_pong[10][8][3] = {
+  // Number 0
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 1 },
+    { 1, 0, 1 },
+    { 1, 0, 1 },
+    { 1, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 1
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 0 },
+    { 0, 1, 0 },
+    { 0, 1, 0 },
+    { 0, 1, 0 },
+    { 1, 1, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 2
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 1 },
+    { 0, 0, 1 },
+    { 1, 1, 1 },
+    { 1, 0, 0 },
+    { 1, 1, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 3
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 1 },
+    { 0, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 4
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 0, 1 },
+    { 1, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 5
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 1 },
+    { 1, 0, 0 },
+    { 1, 1, 1 },
+    { 0, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 6
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 0, 0 },
+    { 1, 0, 0 },
+    { 1, 1, 1 },
+    { 1, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 7
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 8
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 1 },
+    { 1, 0, 1 },
+    { 1, 1, 1 },
+    { 1, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 0 }
+  },
+  // Number 9
+  {
+    { 0, 0, 0 },
+    { 0, 0, 0 },
+    { 1, 1, 1 },
+    { 1, 0, 1 },
+    { 1, 1, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 1 },
+    { 0, 0, 0 }
+  },
+};
+
+const byte frame_pvp[MATRIX_HEIGHT][MATRIX_WIDTH] = {
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0 },
+  { 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
+  { 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0 },
+  { 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0 },
+  { 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+};
+
+const byte frame_pvc[MATRIX_HEIGHT][MATRIX_WIDTH] = {
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
+  { 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0 },
+  { 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0 },
+  { 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0 },
+  { 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+};
+
+const byte frame_cvc[MATRIX_HEIGHT][MATRIX_WIDTH] = {
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 },
+  { 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0 },
+  { 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0 },
+  { 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+};
+
+const byte (*frame_gmodes[3])[12]= {frame_pvp, frame_pvc, frame_cvc};
+
+const byte frame_bot_skill_easy[MATRIX_HEIGHT][MATRIX_WIDTH] = {
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
+  { 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0 },
+  { 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0 },
+  { 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0 },
+  { 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+};
+
+const byte frame_bot_skill_hard[MATRIX_HEIGHT][MATRIX_WIDTH] = {
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0 },
+  { 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0 },
+  { 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0 },
+  { 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0 },
+  { 0, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+};
+
+const byte (*frame_bot_skills[3])[12]= {frame_bot_skill_easy, frame_bot_skill_hard};

src/font.h

@@ -2,183 +2,19 @@
 #define FONT_H
 
 #include <Arduino.h>
+#include "config.h"
 
-const uint32_t pone_wins[][4] = {
-	{
-		0x78,
-		0xc4847844,
-		0x440e000,
-		500
-	},
-	{
-		0x11,
-		0x1101501,
-		0x501f0000,
-		500
-	},
-	{
-		0xe,
-		0x400400,
-		0x400e0000,
-		500
-	},
-	{
-		0x9,
-		0xd00b00,
-		0x90090000,
-		500
-	},
-	{
-		0xf,
-		0x800f00,
-		0x100f0000,
-		500
-	}
-};
-const uint32_t ptwo_wins[][4] = {
-	{
-		0x79,
-		0xe48279e4,
-		0x1041e000,
-		500
-	},
-	{
-		0x11,
-		0x1101501,
-		0x501f0000,
-		500
-	},
-	{
-		0xe,
-		0x400400,
-		0x400e0000,
-		500
-	},
-	{
-		0x9,
-		0xd00b00,
-		0x90090000,
-		500
-	},
-	{
-		0xf,
-		0x800f00,
-		0x100f0000,
-		500
-	}
-};
+extern const uint32_t pone_wins[5][4];
+extern const uint32_t ptwo_wins[5][4];
+extern const byte font_pong[10][8][3];
 
-const byte font_pong[10][8][3] = {
-  // Number 0
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 1 },
-    { 1, 0, 1 },
-    { 1, 0, 1 },
-    { 1, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 1
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 0 },
-    { 0, 1, 0 },
-    { 0, 1, 0 },
-    { 0, 1, 0 },
-    { 1, 1, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 2
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 1 },
-    { 0, 0, 1 },
-    { 1, 1, 1 },
-    { 1, 0, 0 },
-    { 1, 1, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 3
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 1 },
-    { 0, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 4
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 0, 1 },
-    { 1, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 5
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 1 },
-    { 1, 0, 0 },
-    { 1, 1, 1 },
-    { 0, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 6
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 0, 0 },
-    { 1, 0, 0 },
-    { 1, 1, 1 },
-    { 1, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 7
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 8
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 1 },
-    { 1, 0, 1 },
-    { 1, 1, 1 },
-    { 1, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 0 }
-  },
-  // Number 9
-  {
-    { 0, 0, 0 },
-    { 0, 0, 0 },
-    { 1, 1, 1 },
-    { 1, 0, 1 },
-    { 1, 1, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 1 },
-    { 0, 0, 0 }
-  },
-};
+extern const byte frame_pvp[MATRIX_HEIGHT][MATRIX_WIDTH];
+extern const byte frame_pvc[MATRIX_HEIGHT][MATRIX_WIDTH];
+extern const byte frame_cvc[MATRIX_HEIGHT][MATRIX_WIDTH];
+extern const byte (*frame_gmodes[3])[12];
+
+extern const byte frame_bot_skill_easy[MATRIX_HEIGHT][MATRIX_WIDTH];
+extern const byte frame_bot_skill_hard[MATRIX_HEIGHT][MATRIX_WIDTH];
+extern const byte (*frame_bot_skills[3])[12];
 
 #endif

src/paddle.cpp

@@ -1,18 +1,22 @@
 #include "paddle.h"
+#include <cstdio>
 
 void Paddle::move_pad_up() {
-  if (_position > 0) {
-    _position -= 1;
+  if (_pos_y > 0) {
+    _pos_y -= 1;
   }
 }
 void Paddle::move_pad_down() {
-  if (_position + _height < MATRIX_HEIGHT) {
-    _position += 1;
+  if (_pos_y + _height < MATRIX_HEIGHT) {
+    _pos_y += 1;
   }
 }
 
+void run_paddle() {
+}
+
 uint8_t Paddle::get_position() {
-  return _position;
+  return _pos_y;
 }
 
 bool Paddle::is_human() {
@@ -31,24 +35,93 @@ void Paddle::reset() {
   _score= 0;
 }
 
-bool check_paddle_movements(Paddle &p1, Paddle &p2) {
-  bool need_refresh= false;
-  if (digitalRead(P1_BTN_UP) == LOW) {
-    p1.move_pad_up();
-    need_refresh= true;
-  }
-  else if (digitalRead(P1_BTN_BOTTOM) == LOW) {
-    p1.move_pad_down();
-    need_refresh= true;
-  }
+bool Paddle::check_pad_movement() {
+  // redefine me
+  return false;
+}
 
-  if (digitalRead(P2_BTN_UP) == LOW) {
-    p2.move_pad_up();
+bool Paddle::check_pad_movement(Ball &ball) {
+  // redefine me
+  return false;
+}
+
+uint8_t Paddle::get_skills() {
+  return 0;
+}
+
+void Paddle::set_skills(uint8_t skills) {
+}
+
+bool HumanPaddle::check_pad_movement() {
+  bool need_refresh= false;
+  if (digitalRead(_pin_btn_top) == LOW) {
+    this -> move_pad_up();
     need_refresh= true;
   }
-  else if (digitalRead(P2_BTN_BOTTOM) == LOW) {
-    p2.move_pad_down();
+  else if (digitalRead(_pin_btn_bottom) == LOW) {
+    this -> move_pad_down();
     need_refresh= true;
   }
   return need_refresh;
 }
+
+bool BotPaddle::check_pad_movement(Ball &ball) {
+  uint8_t ball_y= ball.get_y();
+  int8_t ball_dir= ball.get_direction_x();
+  int8_t ball_dir_ver= ball.get_direction_y();
+
+  uint8_t skills= this -> get_skills();
+
+  // ball is moving left and pad is on right, do not move
+  if (ball_dir < 0 && _pos_x > MATRIX_WIDTH / 2) return false;
+  // ball is moving right and pad is on left, do not move
+  else if (ball_dir > 0 && _pos_x < MATRIX_WIDTH / 2) return false;
+  
+  uint8_t ball_x= ball.get_x();
+  int8_t ball_distance= ball_x - _pos_x;
+  if (ball_distance < 0) ball_distance *= -1;
+  switch (skills) {
+    case 1:
+      if (ball_distance > 3) return false;
+      break;
+    case 2:
+      if (ball_distance > 4) return false;
+      break;
+  }
+
+  uint8_t move_chances= random(skills * 10) % 2;
+  if (!move_chances) return false;
+
+  enum Movement {NONE, UP, DOWN};
+  Movement _movment= NONE;
+  
+  for (uint8_t py= _pos_y; py < _pos_y+PADDLE_LENGTH-1; py++) {
+    if (_pos_y - ball_y >= 0 && ball_dir_ver < 0) {
+      _movment= UP;
+      break;
+    }
+    if (_pos_y - ball_y <= 0 && ball_dir_ver > 0) {
+      _movment= DOWN;
+      break;
+    }
+  }
+  if (_movment == UP) {
+    this -> move_pad_up();
+    return true;
+  }
+  if (_movment == DOWN) {
+    this -> move_pad_down();
+    return true;
+  }
+  return false;
+}
+
+uint8_t BotPaddle::get_skills() {
+  return _skills;
+}
+
+void BotPaddle::set_skills(uint8_t skills) {
+  if (skills < 0) _skills= 0;
+  else if (skills > 1) _skills= 1;
+  else _skills= skills;
+}

src/paddle.h

@@ -2,19 +2,21 @@
 #define PADDLE_H
 
 #include <Arduino.h>
+#include <cstdint>
 #include "config.h"
+#include "ball.h"
 
 class Paddle {
 
-  private:
+  protected:
     // define player coordinates
-    uint8_t _position;
+    uint8_t _pos_y;
     uint8_t _height= PADDLE_LENGTH;
     uint8_t _score= 0;
-    bool _human= true;
+    bool _human;
 
   public:
-    Paddle (uint8_t _position) : _position(_position) {}
+    Paddle (uint8_t pos_y, bool human) : _pos_y(pos_y), _human(human) {}
     void move_pad_up();
     void move_pad_down();
     uint8_t get_position();
@@ -22,8 +24,34 @@ class Paddle {
     void increase_score();
     uint8_t get_score();
     void reset();
+    virtual bool check_pad_movement();
+    virtual bool check_pad_movement(Ball &ball);
+    virtual uint8_t get_skills();
+    virtual void set_skills(uint8_t skills);
 };
 
-bool check_paddle_movements(Paddle &p1, Paddle &p2);
+class HumanPaddle : public Paddle {
+  private:
+    uint8_t _pin_btn_top;
+    uint8_t _pin_btn_bottom;
+  public:
+    HumanPaddle(uint8_t position, uint8_t pin_btn_top, uint8_t pin_btn_bottom) 
+              : Paddle(position, true), _pin_btn_top(pin_btn_top), _pin_btn_bottom(pin_btn_bottom) {}
+    bool check_pad_movement();
+};
+
+class BotPaddle : public Paddle {
+
+  private:
+    uint8_t _pos_x;
+    uint8_t _skills; // this is the difficulty level
+
+  public:
+    BotPaddle(uint8_t position, uint8_t pos_x) 
+              : Paddle(position, false), _pos_x(pos_x) {}
+    bool check_pad_movement(Ball &ball);
+    uint8_t get_skills();
+    void set_skills(uint8_t skills);
+};
 
 #endif

src/renderer.cpp

@@ -9,6 +9,11 @@ void Renderer::_clear_matrix() {
   }
 }
 
+void Renderer::set_players(Paddle *p1, Paddle *p2) {
+  _p1= p1;
+  _p2= p2;
+}
+
 void Renderer::render_timer(uint8_t seconds) {
   this -> _clear_matrix();
 
@@ -22,8 +27,8 @@ void Renderer::render_timer(uint8_t seconds) {
 
 void Renderer::render_matrix() {
   this -> _clear_matrix();
-  uint8_t p1pos= _p1.get_position();
-  uint8_t p2pos= _p2.get_position();
+  uint8_t p1pos= _p1 -> get_position();
+  uint8_t p2pos= _p2 -> get_position();
   // players coords
   for (int i= p1pos; i < p1pos+PADDLE_LENGTH; i++) {
     _frame[i][0]= 1;
@@ -46,12 +51,12 @@ void Renderer::render_score() {
 
   for (int h=0; h < 8; h++) {
     for (int w=0; w < 3; w++) {
-      _frame[h][w+1]= font_pong[_p1.get_score()][h][w];
+      _frame[h][w+1]= font_pong[_p1 -> get_score()][h][w];
     }
   }
   for (int h=0; h < 8; h++) {
     for (int w=0; w < 3; w++) {
-      _frame[h][w+8]= font_pong[_p2.get_score()][h][w];
+      _frame[h][w+8]= font_pong[_p2 -> get_score()][h][w];
     }
   }
   _matrix.renderBitmap(_frame, MATRIX_HEIGHT, MATRIX_WIDTH);
@@ -60,7 +65,7 @@ void Renderer::render_score() {
 void Renderer::render_winner() {
   this -> _clear_matrix();
   // check winner 
-  if (_p1.get_score() > _p2.get_score())
+  if (_p1 -> get_score() > _p2 -> get_score())
     _matrix.loadSequence(pone_wins);
   else 
     _matrix.loadSequence(ptwo_wins);

src/renderer.h

@@ -12,8 +12,8 @@ class Renderer {
 
   private:
     // define player coordinates
-    Paddle& _p1;
-    Paddle& _p2;
+    Paddle* _p1;
+    Paddle* _p2;
     Ball& _ball;
     byte (&_frame)[MATRIX_HEIGHT][MATRIX_WIDTH];
     ArduinoLEDMatrix& _matrix;
@@ -21,9 +21,10 @@ class Renderer {
     void _clear_matrix();
 
   public:
-    Renderer (Paddle &p1, Paddle &p2, Ball &ball, byte (&frame)[MATRIX_HEIGHT][MATRIX_WIDTH], ArduinoLEDMatrix &matrix) 
-            : _p1(p1), _p2(p2), _ball(ball), _frame(frame), _matrix(matrix) {}
+    Renderer (Ball &ball, byte (&frame)[MATRIX_HEIGHT][MATRIX_WIDTH], ArduinoLEDMatrix &matrix) 
+            : _ball(ball), _frame(frame), _matrix(matrix) {}
 
+    void set_players(Paddle *p1, Paddle *p2);
     void render_timer(uint8_t seconds);
     void render_matrix();
     void render_score();