Virtual Arduino Tennis

#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#include <Wire.h>
#include <EEPROM.h>

#define PIN 6 //Data pin for matrix
#define EEPROM_ADR 0x50 //The I2C address of the EEPROM
#define HS_ADR 0x02 //The address of the highscore byte in the EEPROM

#define NOTE_C1  33
#define SPKR_PIN 3

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(15, 10, PIN,
  NEO_MATRIX_BOTTOM     + NEO_MATRIX_LEFT +
  NEO_MATRIX_COLUMNS + NEO_MATRIX_ZIGZAG,
  NEO_GRB            + NEO_KHZ800);
  
int ball_x = 7; //Ball's X coord
int ball_y = 2; //Ball's Y coord
int radius = 1; //Ball's radius
int r_incr = 1; //How much to increase radius by
bool isSwung = false; //Is the raquet swung
int ball_x_dir = 1; //Ball's X direction
int ball_y_dir = 1; //Ball's Y direction
bool isDirRight = true;
int score = 0; //The score of the current game
int COM_score = 0;
int highscore = 0; //The high score of all games
int framerate = 50; //How many ms between each frame
int serial_data;
String score_string = "";
uint16_t colors[] = {matrix.Color(255,0,0),matrix.Color(0,255,0),matrix.Color(150,200,0)};
int melody[] = {0};
int tempo[] = {0};
static unsigned long lastFrame = 0;

void setup(){
  Serial.begin(9600);
  matrix.begin();
  matrix.fillScreen(0);
  matrix.setTextColor(colors[1]);
  randomSeed(analogRead(A2));
  display_scores();
  highscore = read_HS();
  Serial.println(highscore,DEC);
  matrix.setCursor(0,1);
  matrix.print("HS: ");
  matrix.show();
  delay(1000);
  matrix.fillScreen(0);
  matrix.setCursor(0,1);
  matrix.print(highscore,DEC);
  matrix.show();
  delay(1000);
  score_string = "";
}

void loop(){
  if((lastFrame+framerate)< millis()){
    update_frame();
    lastFrame = millis();
  }
}

void update_frame(){
  serial_data = Serial.parseInt();
  if(serial_data){
    isSwung = true;
  }
  else if(!serial_data){
    isSwung = false;
  }
  if(ball_y >= 5 && ball_y < 7 && isSwung){
    if(isDirRight){
    ball_x_dir = -1;
    ball_y_dir = -1;
    }
    else if(!isDirRight){
      ball_x_dir = 1;
      ball_y_dir = -1;
    }
    r_incr = -1;
  }
  else if(ball_y >= 8){
    COM_score += 1;
    end_round();
    
  }
  else if(ball_y <= 2){
    isDirRight = !isDirRight;
    int randNum = random(4);
    Serial.println(randNum);
    if(randNum == 2){ //25% chance of COM missing
      score += 1;
      if(score > highscore){
      write_HS();
  }
      end_round;
    }
    else{
      if(isDirRight){
      ball_x_dir = 1;
      ball_y_dir = 1;
      }
      else if(!isDirRight){
        ball_x_dir = -1;
        ball_y_dir = 1;
      }
      r_incr = 1;
    }
  }
  ball_x += ball_x_dir;
  ball_y += ball_y_dir;
  radius += r_incr;
  matrix.fillScreen(0);
  matrix.fillCircle(ball_x,ball_y,radius,colors[2]);
  matrix.show();
}

void end_round(){
  
  if(COM_score >= 10){
    end_game();
  }
  isDirRight = true;
  r_incr = 1;
  ball_x_dir = 1;
  ball_y_dir = 1;
  ball_x = 7;
  ball_y = 2;
  radius = 1;
  display_scores();
  matrix.fillScreen(0);
  matrix.fillCircle(ball_x,ball_y,radius,colors[2]);
  matrix.show();
  
}

void end_game(){
  matrix.fillScreen(0);
  matrix.setCursor(0,1);
  matrix.setTextColor(colors[0]);
    matrix.drawLine(3,0,12,9,colors[0]);
    matrix.drawLine(11,0,2,9,colors[0]);
    matrix.show();
    delay(500);
  while(1){
  }
}

void display_scores(){
  matrix.fillScreen(0);
  matrix.setTextColor(colors[1]);
  matrix.setCursor(0,1);
  score_string = String(score) + "-" + String(COM_score);
  scrollText(score_string);
  matrix.fillScreen(0);
  delay(2000);
  matrix.show();
}

void scrollText(String text){
  int pass = 0;
  int x = matrix.width();
  for(int i=0;i<24;i++){
  matrix.fillScreen(0);
  matrix.setCursor(x,2);
  matrix.print(text);
  x -= 1;
  matrix.show();
  delay(150);
  }
}

void write_HS(){
  EEPROM.write(0x04,int(score));
}

int read_HS(){
  byte HS = EEPROM.read(0x04); //Read from address 4
  return HS;
}