add SI prefixes to altitude and pressure

src/hud.rs

@@ -878,10 +878,10 @@ fn update_speedometer(
             // Atmospheric conditions
             let mut atmo = String::new();
             if let Some(val) = settings.atmo_altitude {
-                atmo += format!("Altitude: {val:.6}\n").as_str();
+                atmo += format!("Altitude: {}m\n", nature::readable_si(val as f64)).as_str();
             }
             if let Some(val) = settings.atmo_pressure {
-                atmo += format!("Pressure: {val:.6}\n").as_str();
+                atmo += format!("Pressure: {}bar\n", nature::readable_si(val as f64)).as_str();
             }
             speed_text.sections[0].value = atmo;
 
@@ -897,7 +897,8 @@ fn update_speedometer(
             };
 
             // Velocity relative to target
-            speed_text.sections[2].value = if let Ok(target_v) = q_target.get_single() { let delta_v = (target_v.0 - cam_v.0).length();
+            speed_text.sections[2].value = if let Ok(target_v) = q_target.get_single() {
+                let delta_v = (target_v.0 - cam_v.0).length();
                 if delta_v > 0.0001 {
                     format!("Δv {}\n", nature::readable_speed(delta_v))
                 } else {

src/nature.rs

@@ -155,6 +155,21 @@ pub fn readable_speed(speed: f64) -> String {
     }
 }
 
+pub fn readable_si(value: f64) -> String {
+    if value > 1e10 {
+        return format!("{:.3} G", value / 1e9);
+    } else if value > 1e7 {
+        return format!("{:.3} M", value / 1e6);
+    } else if value > 1e4 {
+        return format!("{:.3} k", value / 1e3);
+    } else if value < 1e-2 {
+        return format!("{:.3} m", value * 1e3);
+    } else if value < 1e-5 {
+        return format!("{:.3} µ", value * 1e3);
+    }
+    return format!("{:.3} ", value);
+}
+
 pub fn lorentz_factor(speed: f64) -> f64 {
     (1.0 - (speed.powf(2.0) / C.powf(2.0))).powf(-0.5)
 }