// Sketch to draw an analogue clock on the screen
 // This uses anti-aliased drawing functions that are built into TFT_eSPI
 
 // Anti-aliased lines can be drawn with sub-pixel resolution and permit lines to be
 // drawn with less jaggedness.
 
 // Based on a sketch by DavyLandman:
 // https://github.com/Bodmer/TFT_eSPI/issues/905
 
 
 #define WIFI_SSID      "Your_SSID"
 #define WIFI_PASSWORD  "Your_Password"
 
 #include <Arduino.h>
 #include <TFT_eSPI.h> // Master copy here: https://github.com/Bodmer/TFT_eSPI
 #include <SPI.h>
 
 #include "NotoSansBold15.h"
 
 TFT_eSPI tft = TFT_eSPI();  // Invoke library, pins defined in User_Setup.h
 TFT_eSprite face = TFT_eSprite(&tft);
 
 #define CLOCK_X_POS 10
 #define CLOCK_Y_POS 10
 
 #define CLOCK_FG   TFT_SKYBLUE
 #define CLOCK_BG   TFT_NAVY
 #define SECCOND_FG TFT_RED
 #define LABEL_FG   TFT_GOLD
 
 #define CLOCK_R       127.0f / 2.0f // Clock face radius (float type)
 #define H_HAND_LENGTH CLOCK_R/2.0f
 #define M_HAND_LENGTH CLOCK_R/1.4f
 #define S_HAND_LENGTH CLOCK_R/1.3f
 
 #define FACE_W CLOCK_R * 2 + 1
 #define FACE_H CLOCK_R * 2 + 1
 
 // Calculate 1 second increment angles. Hours and minute hand angles
 // change every second so we see smooth sub-pixel movement
 #define SECOND_ANGLE 360.0 / 60.0
 #define MINUTE_ANGLE SECOND_ANGLE / 60.0
 #define HOUR_ANGLE   MINUTE_ANGLE / 12.0
 
 // Sprite width and height
 #define FACE_W CLOCK_R * 2 + 1
 #define FACE_H CLOCK_R * 2 + 1
 
 // Time h:m:s
 uint8_t h = 0, m = 0, s = 0;
 
 float time_secs = h * 3600 + m * 60 + s;
 
 // Load header after time_secs global variable has been created so it is in scope
 #include "NTP_Time.h" // Attached to this sketch, see that tab for library needs
 
 // Time for next tick
 uint32_t targetTime = 0;
 
 // =========================================================================
 // Setup
 // =========================================================================
 void setup() {
   Serial.begin(115200);
   Serial.println("Booting...");
 
   // Initialise the screen
   tft.init();
 
   // Ideally set orientation for good viewing angle range because
   // the anti-aliasing effectiveness varies with screen viewing angle
   // Usually this is when screen ribbon connector is at the bottom
   tft.setRotation(0);
   tft.fillScreen(TFT_BLACK);
 
   // Create the clock face sprite
   //face.setColorDepth(8); // 8 bit will work, but reduces effectiveness of anti-aliasing
   face.createSprite(FACE_W, FACE_H);
 
   // Only 1 font used in the sprite, so can remain loaded
   face.loadFont(NotoSansBold15);
 
   // Draw the whole clock - NTP time not available yet
   renderFace(time_secs);
 
   targetTime = millis() + 100;
 }
 
 // =========================================================================
 // Loop
 // =========================================================================
 void loop() {
   // Update time periodically
   if (targetTime < millis()) {
 
     // Update next tick time in 100 milliseconds for smooth movement
     targetTime = millis() + 100;
 
     // Increment time by 100 milliseconds
     time_secs += 0.100;
 
     // Midnight roll-over
     if (time_secs >= (60 * 60 * 24)) time_secs = 0;
 
     // All graphics are drawn in sprite to stop flicker
     renderFace(time_secs);
 
     // Request time from NTP server and synchronise the local clock
     // (clock may pause since this may take >100ms)
     syncTime();
   }
 }
 
 // =========================================================================
 // Draw the clock face in the sprite
 // =========================================================================
 static void renderFace(float t) {
   float h_angle = t * HOUR_ANGLE;
   float m_angle = t * MINUTE_ANGLE;
   float s_angle = t * SECOND_ANGLE;
 
   // The face is completely redrawn - this can be done quickly
   face.fillSprite(TFT_BLACK);
 
   // Draw the face circle
   face.fillSmoothCircle( CLOCK_R, CLOCK_R, CLOCK_R, CLOCK_BG );
 
   // Set text datum to middle centre and the colour
   face.setTextDatum(MC_DATUM);
 
   // The background colour will be read during the character rendering
   face.setTextColor(CLOCK_FG, CLOCK_BG);
 
   // Text offset adjustment
   constexpr uint32_t dialOffset = CLOCK_R - 10;
 
   float xp = 0.0, yp = 0.0; // Use float pixel position for smooth AA motion
 
   // Draw digits around clock perimeter
   for (uint32_t h = 1; h <= 12; h++) {
     getCoord(CLOCK_R, CLOCK_R, &xp, &yp, dialOffset, h * 360.0 / 12);
     face.drawNumber(h, xp, 2 + yp);
   }
 
   // Add text (could be digital time...)
   face.setTextColor(LABEL_FG, CLOCK_BG);
   face.drawString("TFT_eSPI", CLOCK_R, CLOCK_R * 0.75);
 
   // Draw minute hand
   getCoord(CLOCK_R, CLOCK_R, &xp, &yp, M_HAND_LENGTH, m_angle);
   face.drawWideLine(CLOCK_R, CLOCK_R, xp, yp, 6.0f, CLOCK_FG);
   face.drawWideLine(CLOCK_R, CLOCK_R, xp, yp, 2.0f, CLOCK_BG);
 
   // Draw hour hand
   getCoord(CLOCK_R, CLOCK_R, &xp, &yp, H_HAND_LENGTH, h_angle);
   face.drawWideLine(CLOCK_R, CLOCK_R, xp, yp, 6.0f, CLOCK_FG);
   face.drawWideLine(CLOCK_R, CLOCK_R, xp, yp, 2.0f, CLOCK_BG);
 
   // Draw the central pivot circle
   face.fillSmoothCircle(CLOCK_R, CLOCK_R, 4, CLOCK_FG);
 
   // Draw cecond hand
   getCoord(CLOCK_R, CLOCK_R, &xp, &yp, S_HAND_LENGTH, s_angle);
   face.drawWedgeLine(CLOCK_R, CLOCK_R, xp, yp, 2.5, 1.0, SECCOND_FG);
   face.pushSprite(5, 5, TFT_TRANSPARENT);
 }
 
 // =========================================================================
 // Get coordinates of end of a line, pivot at x,y, length r, angle a
 // =========================================================================
 // Coordinates are returned to caller via the xp and yp pointers
 #define DEG2RAD 0.0174532925
 void getCoord(int16_t x, int16_t y, float *xp, float *yp, int16_t r, float a)
 {
   float sx1 = cos( (a - 90) * DEG2RAD);
   float sy1 = sin( (a - 90) * DEG2RAD);
   *xp =  sx1 * r + x;
   *yp =  sy1 * r + y;
 }

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