#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "bitmap.h"

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define BITMAP_WIDTH  25
#define BITMAP_HEIGHT 13

int MAXX = SCREEN_WIDTH - BITMAP_WIDTH;
int MAXY = SCREEN_HEIGHT - BITMAP_HEIGHT;

int xMov = 2;
int yMov = 2;
int x = random(SCREEN_WIDTH);
int y = random(SCREEN_HEIGHT);

Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(9600);
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {  // 0x3c = 128x64?
    Serial.println(F("SSD1306 allocation failed"));
    while (true) {};
  }
}

void loop() {
  bounce();
}

void bounce() {
  if (x <= 0 || x >= MAXX) // x boundries
    xMov = -xMov;

  if (y <= 0 || y >= MAXY) // y boundries
    yMov = -yMov;

  x += xMov;
  y += yMov;

  oled.clearDisplay();
  oled.drawBitmap(x, y, myBitmap, BITMAP_WIDTH, BITMAP_HEIGHT, WHITE);
  oled.display();
}