From 5513510ad1d3cf151f33f46de2365b27e09fc40e Mon Sep 17 00:00:00 2001
From: Gergely Polonkai <gergely@polonkai.eu>
Date: Wed, 18 May 2022 05:23:44 +0200
Subject: [PATCH] Add markers with the solar noon and nadir (solar midnight)

---
 src/main.rs | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 2 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 83c993b..c6b8572 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@ extern crate smithay_client_toolkit as sctk;
 use std::time::SystemTime;
 
 use chrono::prelude::Local;
+use chrono::TimeZone;
 use chrono::Timelike;
 use sctk::reexports::client::protocol::{wl_shm, wl_surface};
 use sctk::shm::AutoMemPool;
@@ -101,11 +102,14 @@ fn get_moon_path(image_width: u32, radius: f32, moon_phase: f64) -> Path {
 }
 
 fn gen_svg() -> Document {
-    // These should be calculated
     let local_timestamp = Local::now();
     let utc_offset = local_timestamp.offset().local_minus_utc();
     let local_time = local_timestamp.time().num_seconds_from_midnight() as i32;
 
+    // TODO: Make these configurable
+    let lat = 47.655235;
+    let long = 19.2868815;
+
     // TODO: These should be calculated instead of hardcoded
     let image_width = 700u32;
 
@@ -115,11 +119,23 @@ fn gen_svg() -> Document {
     let moon_radius = image_width as f32 * 0.071428571;
     let moon_phase = moon_illumination.phase * 28.0;
 
+    let sun_times = suncalc::get_times(unixtime, lat, long, None);
+    let noon = Local
+        .timestamp_millis(sun_times.solar_noon.0)
+        .time()
+        .num_seconds_from_midnight() as i32;
+    let midnight = Local
+        .timestamp_millis(sun_times.nadir.0)
+        .time()
+        .num_seconds_from_midnight() as i32;
+
     let local_hour_font_size = 16.5;
-    let utc_hour_font_size = image_width as f32 * 0.021462;
     let hour_name_font_size = 13.37699;
+    let utc_hour_font_size = image_width as f32 * 0.021462;
     let outer_r = (image_width as f32) / 2.0 - 3.0 * hour_name_font_size;
     let ring_width = hour_name_font_size * 3.0;
+    let sun_radius = image_width as f32 * 0.0142871;
+    let marker_radius = outer_r - ring_width - 2.0 * utc_hour_font_size;
     let border = Rectangle::new()
         .set("x", 0i32)
         .set("y", 0i32)
@@ -133,6 +149,7 @@ fn gen_svg() -> Document {
         .local-hour {stroke: none; fill: rgb(238, 187, 85);}
         .moon-background {stroke: rgb(170, 170, 170); stroke-width: 2px; fill: rgb(19, 17, 30);}
         .moon {stroke: none; fill: rgb(170, 170, 170);}
+        .mid-marker {stroke: red;}
         .dial {stroke-width: 2px; stroke: rgb(238, 187, 85);}",
     );
     let mut local_clock = Group::new().set("id", "local-clock");
@@ -190,6 +207,42 @@ fn gen_svg() -> Document {
         .add(moon_circle)
         .add(get_moon_path(image_width, moon_radius, moon_phase));
 
+    let noon_marker = Line::new()
+        .set("class", "mid-marker")
+        .set(
+            "transform",
+            format!(
+                "rotate({}, {}, {})",
+                time_to_degrees(noon),
+                image_width / 2,
+                image_width / 2
+            ),
+        )
+        .set("x1", image_width / 2)
+        .set(
+            "y1",
+            image_width as f32 / 2.0 + marker_radius - sun_radius as f32,
+        )
+        .set("x2", image_width / 2)
+        .set("y2", image_width as f32 / 2.0 + marker_radius);
+    let midnight_marker = Line::new()
+        .set("class", "mid-marker")
+        .set(
+            "transform",
+            format!(
+                "rotate({}, {}, {})",
+                time_to_degrees(midnight),
+                image_width / 2,
+                image_width / 2
+            ),
+        )
+        .set("x1", image_width / 2)
+        .set(
+            "y1",
+            image_width as f32 / 2.0 + marker_radius - sun_radius as f32,
+        )
+        .set("x2", image_width / 2)
+        .set("y2", image_width as f32 / 2.0 + marker_radius);
     let dial = Line::new()
         .set("id", "dial")
         .set("class", "dial")
@@ -220,6 +273,8 @@ fn gen_svg() -> Document {
         .add(local_clock)
         .add(seasonal_clock)
         .add(moon_group)
+        .add(noon_marker)
+        .add(midnight_marker)
         .add(dial)
 }