PONG.ino

#include <TFT_eSPI.h>

//create the screen variable from the library
TFT_eSPI tft = TFT_eSPI();

// Set up variables for the cursor and counter. Cursor starts in the middle of the screen.
int paddleX = 50;
int paddleY = 0;
int oldPaddleX, oldPaddleY;
int ballDirectionX = 1;
int ballDirectionY = 1;
int ballX, ballY, oldBallX, oldBallY;
int ballSpeed = 10; // lower numbers are faster
int width = 10;
int height = 40;
int player1;
int player2;

// Define colours in 4-digit hex                                  
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF

// Setting the joystick pins here so we can easily change them
#define JOYSTICK_X_PIN A14
#define JOYSTICK_Y_PIN A15
#define JOYSTICK_BUTTON_PIN 23


void setup() {
  // put your setup code here, to run once:
  // Initalize the screen and set the orientation correctly, then make sure it's clear.
  tft.begin();
  tft.setRotation(1);
  tft.fillScreen(BLACK);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  int myWidth = tft.width();
  int myHeight = tft.height();

  paddleY = paddleY + map(analogRead(A15), 0, 1023, -1, 1);

  if (0 >= paddleY)
    paddleY = 0;

  if (280 <= (paddleY))
    paddleY = 280;

  if (oldPaddleY != paddleY) {
    tft.fillRect(oldPaddleX, oldPaddleY, width, height, BLACK);
  }

  tft.fillRect(paddleX, paddleY, width, height, WHITE);

  oldPaddleX = paddleX;
  oldPaddleY = paddleY;

  // update the ball's position and draw it on screen
  if (millis() % ballSpeed < 2) {
    moveBall();
  }


}

void moveBall() {

  if (ballX > tft.width()) {
    player2 += 1;
  }

  if (ballX < 0) {
    player1 += 1;
  }

  if (ballY > tft.height() || ballY < 0) {

    ballDirectionY = -ballDirectionY;

  }

  if (inPaddle(ballX, ballY, paddleX, paddleY, width, height)) {

    ballDirectionX = -ballDirectionX;

  }

  ballX += ballDirectionX;
  ballY += ballDirectionY;

  if (oldBallX != ballX || oldBallY != ballY) {

    tft.fillCircle(oldBallX, oldBallY, 5, BLACK);

  }

  tft.fillCircle(ballX, ballY, 5, WHITE);

  oldBallX = ballX;

  oldBallY = ballY;
}

boolean inPaddle(int x, int y, int rectX, int rectY, int rectWidth, int rectHeight) {

  boolean result = false;

  if ((x >= rectX && x <= (rectX + rectWidth)) &&

    (y >= rectY && y <= (rectY + rectHeight))) {

    result = true;

  }

  return result;
}