Snake game

#include <Arduino.h>
#include <Adafruit_GFX.h>     // Core graphics library
#include <Adafruit_ST7735.h>  // Hardware-specific library
#include <SPI.h>

// standard U of A library settings, assuming Atmel Mega SPI pins
#define TFT_CS    6  // Chip select line for TFT display
#define TFT_DC    7  // Data/command line for TFT
#define TFT_RST   8  // Reset line for TFT (or connect to +5V)

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

// specify pins
const int VERT = 0;
const int HORIZ = 1;
const int SEL = 9;

void game_over() {
  tft.fillScreen(0x0000);
  tft.setCursor(64, 80);
  tft.setTextColor(0xF800, 0xF800);
  tft.setTextSize(3);
  tft. setTextWrap(true);
  print("GAME OVER!");
}


int main() {
  init();

  // setup
  pinMode(SEL, INPUT);
  digitalWrite(SEL, HIGH)

  Serial.begin(9600);

  // if analog pin 1 is unconnected it will cause randomSeed to generate
  // different seed numbers each time the program runs
  randomSeed(analogRead(1));

  tft.initR(INITR_REDTAB); // initialize a ST7735 chip

  // set the background to black
  tft.fillScreen(0x0000);

  int init_vert, init_horiz;
  init_vert = analogRead(VERT);
  init_horiz = analogRead(HORIZ);

  int cursor_x = 64, cursor_y = 80; // initial cursor position
  int old_cursor_x = cursor_x; // useful for storing old cursor position
  int old_cursor_y = cursor_y;

  // loop
  while (true) {
    int vertical, horizontal, select;

    vertical = analogRead(VERT);     // will be 0-1023
    horizontal = analogRead(HORIZ)   // will be 0-1023
    select = digitalRead(SEL);       // HIGH if not pressed, LOW otherwise

    int delta_vert, delta_horiz;

    delta_vert = vertical - init_vert;   // vertical change in joystick
    delta_horiz = horizontal - init_horiz; // horizontal change in joystick

    cursor_x = cursor_x - delta_horiz/200;  // maps to change of cursor
    cursor_y = cursor_y - delta_vert/200;

    // check if the current location is different than the previous
    if (cursor_x != old_cursor_x || cursor_y != old_cursor_y) {
      tft.fillRect (old_cursor_x, old_cursor_y, 2, 2, 0x0000)
    }

    // draw the cursor in current location
    tft.fillRect(cursor_x, cursor_y, 2, 2, 0x07E0);

    // if the cursor is at the screen edges, show game over screen
    if (cursor_x >= 128 || cursor_x <= 0) {
      game_over();
    }
    if (cursor_y >= 160 || cursor_y <= 0) {
      game_over();
    }

    // update the point's previous location
    old_cursor_x = cursor_x;
    old_cursor_y = cursor_y;

    delay(50);  // to make sure the cursor is moving smoothly

    // need random x and y coordinates for the "apples" appear
    rand_apple_x = random(1,128);
    rand_apple_y = random(1,160);
    tft.fillRect (rand_apple_x, rand_apple_y, 2, 2, 0xF800);

    // add a trailing rect behind the cursor when it touches the apple
    // and make the apple disappear and make another one appear immediately
    // in a random place on the screen