From b72a5965592cd034671b0a1db338a7cc960a608c Mon Sep 17 00:00:00 2001
From: hut <hut@hut.pm>
Date: Mon, 8 Apr 2024 03:00:48 +0200
Subject: [PATCH] fix distance display, and autoconvert large numbers to other
 units

---
 src/hud.rs    | 15 ++++++++-------
 src/nature.rs | 21 +++++++++++++++++++++
 src/world.rs  |  8 +++++---
 3 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/src/hud.rs b/src/hud.rs
index 7ceccd2..c7b6ace 100644
--- a/src/hud.rs
+++ b/src/hud.rs
@@ -522,17 +522,14 @@ fn update_hud(
                 text.sections[17].value = format!("{integrity:.0}%");
                 let speed = cam_v.length();
                 let kmh = speed * 60.0 * 60.0 / 1000.0;
-                text.sections[19].value = format!("{speed:.0}m/s | {kmh:.0}km/h");
+                let speed_readable = nature::readable_distance(speed);
+                text.sections[19].value = format!("{speed_readable}/s | {kmh:.0}km/h");
 
                 // Target display
                 let (x, y, z, dist_scalar) : (f64, f64, f64, f64);
                 if let Ok((_, IsClickable { distance: Some(dist), .. })) = q_target.get_single() {
-                    if *dist >= 100000.0 {
-                        dist_scalar = f64::NAN;
-                    } else {
-                        dist_scalar = *dist;
-                    }
                     (x, y, z) = (0.0, 0.0, 0.0);
+                    dist_scalar = *dist;
                 }
                 else {
                     let target: Option<DVec3>;
@@ -560,7 +557,11 @@ fn update_hud(
                     text.sections[7].value = format!("distance: UNKNOWN");
                 }
                 else if dist_scalar != 0.0 {
-                    text.sections[7].value = format!("{x:.0}m / {z:.0}m / {y:.0}m / distance: {dist_scalar:.0}m");
+                    let x_readable = nature::readable_distance(x);
+                    let y_readable = nature::readable_distance(y);
+                    let z_readable = nature::readable_distance(z);
+                    let distance_readable = nature::readable_distance(dist_scalar);
+                    text.sections[7].value = format!("{x_readable} / {z_readable} / {y_readable} / distance: {distance_readable}");
                 }
                 else {
                     text.sections[7].value = format!("TARGET ERROR");
diff --git a/src/nature.rs b/src/nature.rs
index 66a02ef..6d16b69 100644
--- a/src/nature.rs
+++ b/src/nature.rs
@@ -7,6 +7,7 @@ pub const OXY_S: f32 = OXYGEN_USE_KG_PER_S;
 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 LIGHTYEAR2METER: f64 = 9_460_730_472_580_800.0;
 pub const PARSEC2METER: f64 = 3.0857e16;
 pub const DIST_JUPTER_SUN: f64 = 778479.0e6;
 pub const EARTH_GRAVITY: f32 = 9.81;
@@ -81,3 +82,23 @@ pub fn ring_density(radius: f32) -> f32 {
 
     return density;
 }
+
+pub fn readable_distance(distance: f64) -> String {
+    if distance > LIGHTYEAR2METER * 0.001 {
+        let lightyears = distance / LIGHTYEAR2METER;
+        return format!("{lightyears:.3}ly");
+    }
+    if distance >= 1.0e10 {
+        let gigameters = distance * 1.0e-9;
+        return format!("{gigameters:.1}Gm");
+    }
+    if distance >= 1.0e7 {
+        let megameters = distance * 1.0e-6;
+        return format!("{megameters:.1}Mm");
+    }
+    if distance >= 1.0e4 {
+        let kilometers = distance * 1.0e-3;
+        return format!("{kilometers:.1}km");
+    }
+    return format!("{distance:.1}m");
+}
diff --git a/src/world.rs b/src/world.rs
index d47486b..5f8013e 100644
--- a/src/world.rs
+++ b/src/world.rs
@@ -151,9 +151,11 @@ pub fn setup(
         });
         let mesh_distance = 1e9;
         let starchart_distance = if is_sun {
-            nature::DIST_JUPTER_SUN
+            Some(nature::DIST_JUPTER_SUN)
+        } else if star.5 >= 100000.0 {
+            None
         } else {
-            nature::PARSEC2METER * star.5 as f64
+            Some(nature::PARSEC2METER * star.5 as f64)
         };
         let name = if star.6.is_empty() {
             "Uncharted Star".to_string()
@@ -164,7 +166,7 @@ pub fn setup(
             Star,
             hud::IsClickable {
                 name: Some(name),
-                distance: Some(starchart_distance),
+                distance: starchart_distance,
             },
             PbrBundle {
                 mesh: sphere_handle.clone(),