#include <U8glib.h>

    U8GLIB_ST7920_128X64 u8g(13, 11, 12, U8G_PIN_NONE);

    void setup(void) {}

    void loop(void) {
      u8g.firstPage();

      int x = 1;
      for (int i = 0; i > -1; i = i + x)
       {
          u8g.drawCircle(i , 32, 10);
          if (i == 128) x = -1;

          do
       {
           u8g.drawCircle ( i , 32 , 10);
       }

          while( u8g.nextPage() );
          delay(50);
      }
    }