handypong.ino

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

const unsigned long PADDLE_RATE = 36;
const unsigned long BALL_RATE = 20;
const uint8_t PADDLE_HEIGHT = 20;

#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 
#define OLED_RESET     4 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

char x;
long int v;
void drawCourt();

uint8_t ball_x = 64, ball_y = 32;
uint8_t ball_dir_x = 1, ball_dir_y = 1;
unsigned long ball_update;

unsigned long paddle_update;
const uint8_t CPU_X = 12;
uint8_t cpu_y = 16;

const uint8_t PLAYER_X = 115;
uint8_t player_y = 16;

void setup() {
  Serial.begin(9600);
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C);    
    display.display();
    unsigned long start = millis();
    display.clearDisplay();
    drawCourt();
    while(millis() - start < 2000);
    display.display();
    ball_update = millis();
    paddle_update = ball_update;
}

void loop() {
    bool update = false;
    unsigned long time = millis();
    static bool up_state = false;
    static bool down_state = false;
    
    if(Serial.available()>0){
     x =Serial.read();
     v =Serial.parseInt();
  
    if(time > ball_update) {
        uint8_t new_x = ball_x + ball_dir_x;
        uint8_t new_y = ball_y + ball_dir_y;

        // Check if we hit the vertical walls
        if(new_x == 0 || new_x == 127) {
            ball_dir_x = -ball_dir_x;
            new_x += ball_dir_x + ball_dir_x;
        }

        // Check if we hit the horizontal walls.
        if(new_y == 0 || new_y == 63) {
            ball_dir_y = -ball_dir_y;
            new_y += ball_dir_y + ball_dir_y;
        }

        // Check if we hit the CPU paddle
        if(new_x == CPU_X && new_y >= cpu_y && new_y <= cpu_y + PADDLE_HEIGHT) {
            ball_dir_x = -ball_dir_x;
            new_x += ball_dir_x + ball_dir_x;
        }

        // Check if we hit the player paddle
        if(new_x == PLAYER_X
           && new_y >= player_y
           && new_y <= player_y + PADDLE_HEIGHT)
        {
            ball_dir_x = -ball_dir_x;
            new_x += ball_dir_x + ball_dir_x;
        }

        display.drawPixel(ball_x, ball_y, BLACK);
        display.drawPixel(new_x, new_y, WHITE);
        ball_x = new_x;
        ball_y = new_y;

        ball_update += BALL_RATE;

        update = true;
    }

    if(time > paddle_update) {
        paddle_update += PADDLE_RATE;

        // CPU paddle
        display.drawFastVLine(CPU_X, cpu_y, PADDLE_HEIGHT, BLACK);
        const uint8_t half_paddle = PADDLE_HEIGHT >> 1;
        if(cpu_y + half_paddle > ball_y) {
            cpu_y -= 1;
        }
        if(cpu_y + half_paddle < ball_y) {
            cpu_y += 1;
        }
        if(cpu_y < 1) cpu_y = 1;
        if(cpu_y + PADDLE_HEIGHT > 63) cpu_y = 63 - PADDLE_HEIGHT;
        display.drawFastVLine(CPU_X, cpu_y, PADDLE_HEIGHT, WHITE);

        // Player paddle
        display.drawFastVLine(PLAYER_X, player_y, PADDLE_HEIGHT, BLACK);
        if(v<20) {
            player_y -= 1;
        }
        if(v>30) {
            player_y += 1;
        }
        up_state = down_state = false;
        if(player_y < 1) player_y = 1;
        if(player_y + PADDLE_HEIGHT > 63) player_y = 63 - PADDLE_HEIGHT;
        display.drawFastVLine(PLAYER_X, player_y, PADDLE_HEIGHT, WHITE);

        update = true;
    }
 
    if(update)
           
  display.display();  // Print everything we set previously
}
}
void drawCourt() {
    display.drawRect(0, 0, 128, 64, WHITE);   
}