Arduino RealTimeClock as circle on 0.96" OLED display

#include <Wire.h>
#include <TimeLib.h>
#include <DS1307RTC.h>
//#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire);

void setup()
{
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
}

void loop()
{
  tmElements_t tm;
  display.clearDisplay();
  if (RTC.read(tm)) {
    lcdDraw(tm.Hour, 20, 25, 10, 8, 3, 5);
    lcdDraw(tm.Minute, 11, 5, 33, 5, 2, 10);
    lcdDraw(tm.Second, 11, 5, 55, 5, 2, 10);
    display.display();
  }
  delay(1000);
}

void lcdDraw(byte timeis, byte x1, byte x2, byte y, byte d1, byte d2, byte d3) {
  byte a = timeis / d3; int b = timeis % d3;
  for (byte i = 0; i < a; i++) {
    display.drawCircle(i * x1 + x2, y, d1, SSD1306_WHITE);
  }

  for (byte i = 0; i < b; i++) {
    display.fillCircle(i * x1 + x2, y, d2, SSD1306_INVERSE);
  }
}