From 55f0c6c607d77ace2952d6c25db4b257970bd012 Mon Sep 17 00:00:00 2001
From: hut <hut@hut.pm>
Date: Mon, 8 Apr 2024 01:13:31 +0200
Subject: [PATCH] correct sun distance display

---
 src/nature.rs |  1 +
 src/world.rs  | 24 +++++++++++++++---------
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/src/nature.rs b/src/nature.rs
index e4af0f5..f8abec7 100644
--- a/src/nature.rs
+++ b/src/nature.rs
@@ -8,6 +8,7 @@ pub const OXY_M: f32 = OXYGEN_USE_KG_PER_S * 60.0;
 pub const OXY_H: f32 = OXYGEN_USE_KG_PER_S * 60.0 * 60.0;
 pub const OXY_D: f32 = OXYGEN_USE_KG_PER_S * 60.0 * 60.0 * 24.0;
 pub const PARSEC2METER: f64 = 3.0857e16;
+pub const DIST_JUPTER_SUN: f64 = 778479.0e6;
 
 pub fn star_color_index_to_rgb(color_index: f32) -> (f32, f32, f32) {
     let temperature = 4600.0 * ((1.0 / (0.92 * color_index + 1.7)) + (1.0 / (0.92 * color_index + 0.62)));
diff --git a/src/world.rs b/src/world.rs
index 5136637..8e61c1a 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -125,19 +125,20 @@ pub fn setup(
     let mut starcount = 0;
     for star in stars::STARS {
         let mag = star.3;
+        let is_sun = mag < -20.0;
         if mag > STARS_MAX_MAGNITUDE {
             continue;
         }
         let scale_color = {|color: f32|
-            if mag < -20.0 {
-                color * 13.0f32 // Sun
+            if is_sun {
+                color * 13.0f32
             } else {
                 color * (0.0659663 * mag * mag - 1.09862 * mag + 4.3)
             }
         };
         let scale_size = {|mag: f32|
-            if mag < -20.0 {
-                40000.0f32 // Sun
+            if is_sun {
+                40000.0f32
             } else {
                 1000.0 * (0.230299 * mag * mag - 3.09013 * mag + 15.1782)
             } * 100.0
@@ -148,7 +149,12 @@ pub fn setup(
             unlit: true,
             ..default()
         });
-        let dist = 1e9;
+        let mesh_distance = 1e9;
+        let starchart_distance = if is_sun {
+            nature::DIST_JUPTER_SUN
+        } else {
+            nature::PARSEC2METER * star.5 as f64
+        };
         let name = if star.6.is_empty() {
             "Uncharted Star".to_string()
         } else {
@@ -158,15 +164,15 @@ pub fn setup(
             Star,
             hud::IsClickable {
                 name: Some(name),
-                distance: Some(nature::PARSEC2METER * star.5 as f64),
+                distance: Some(starchart_distance),
             },
             PbrBundle {
                 mesh: sphere_handle.clone(),
                 material: star_color_handle,
                 transform: Transform::from_xyz(
-                        dist * star.0,
-                        dist * star.1,
-                        dist * star.2,
+                        mesh_distance * star.0,
+                        mesh_distance * star.1,
+                        mesh_distance * star.2,
                     )
                     .with_scale(Vec3::splat(scale_size(mag))),
                 ..default()