#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define button_1 19
#define button_2 18
#define button_3 14
#define button_4 12

int x=60;
int y=30;
int width=10;
int height=8;

Adafruit_SSD1306 display (128,64,&Wire,-1); //-1 means the reset pin is not connected

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(button_1, INPUT_PULLUP);
  pinMode(button_2, INPUT_PULLUP);
  pinMode(button_3, INPUT_PULLUP);
  pinMode(button_4, INPUT_PULLUP);
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0X3c))
  {
    Serial.println("display not found");
    while(1);
  }
  display.clearDisplay();
  display.display();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(10,10);

  delay(2000);
  display.clearDisplay();
  display.stopscroll();
  display.drawRect(x,y,width,height,WHITE);
  display.display();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  if (digitalRead(button_1)==0) {
    Serial.println("left button pressed");
    x=x-1;
  }
  if (digitalRead(button_4)==0) {
    Serial.println("right button pressed");
    x=x+1;
  }
  if (digitalRead(button_2)==0) {
    Serial.println("up button pressed");
    y=y-1;
  }
  if (digitalRead(button_3)==0) {
    Serial.println("down button pressed");
    y=y+1;
  }
  display.clearDisplay();
  display.drawRect(x,y,width,height,WHITE);
  display.display();
}