#include <RTClib.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>

#define TFT_DC 9
#define TFT_CS 10
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
int s = 0, m = 0, h = 0;
RTC_DS1307 rtc;

void setup() {
  Serial.begin(9600);
  tft.begin();
  rtc.begin();
}

void loop() {
  DateTime now = rtc.now();
  int x1, x2, x3, y1, y2, y3;
  s = now.second(), m = now.minute(), h = now.hour();

  tft.drawCircle(120, 160, 110, ILI9341_WHITE);
  for (int i = 0; i < 360; i += 6) {
    double radian = (i * PI) / 180;
    int s_x = 120 + cos(radian) * (105 - !(i % 30) * 7);
    int s_y = 160 + sin(radian) * (105 - !(i % 30) * 7);
    int e_x = 120 + cos(radian) * 110;
    int e_y = 160 + sin(radian) * 110;
    tft.drawLine(s_x, s_y, e_x, e_y, ILI9341_WHITE);
  }
  double radian = ((s * 6 - 90) * PI) / 180.0;
  double x = 120 + cos(radian) * 80;
  double y = 160 + sin(radian) * 80;
  tft.drawLine(120, 160, x, y, ILI9341_RED);
  x1 = x, y1 = y;
  radian = ((m * 6 + (s * 6 / 60.0) - 90) * PI) / 180;
  x = 120 + cos(radian) * 105;
  y = 160 + sin(radian) * 105;
  tft.drawLine(120, 160, x, y, ILI9341_WHITE);
  x2 = x, y2 = y;
  radian = ((h * 30 + (m * 30 / 60.0) - 90) * PI) / 180;
  x = 120 + cos(radian) * 75;
  y = 160 + sin(radian) * 75;
  tft.drawLine(120, 160, x, y, ILI9341_WHITE);
  x3 = x, y3 = y;
  tft.fillCircle(120, 160, 3, ILI9341_WHITE);

  delay(1000);
  tft.drawLine(120, 160, x1, y1, ILI9341_BLACK);
  tft.drawLine(120, 160, x2, y2, ILI9341_BLACK);
  tft.drawLine(120, 160, x3, y3, ILI9341_BLACK);
}