From 961f8c6d405c9c6fcf9aaf4fb6f199b0e5c60d88 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Thu, 30 Apr 2026 10:06:32 -0400
Subject: add orbit rendering for bodies

---
 src/solar_system.rs | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

(limited to 'src/solar_system.rs')

diff --git a/src/solar_system.rs b/src/solar_system.rs
index c98a0e8..cf6a36a 100644
--- a/src/solar_system.rs
+++ b/src/solar_system.rs
@@ -1,6 +1,6 @@
 use serde::{Deserialize};
 use crate::{GameState, known_stars::{KNOWN_STARS, StarNotFoundError}, timeman::{Second, TimeMan}};
-use std::{cell::RefCell, error::Error};
+use std::{cell::RefCell, error::Error, f64::consts::PI};
 
 const GRAVITATIONAL_CONSTANT: f64 = 6.67408e-20;
 
@@ -33,11 +33,13 @@ pub struct SerialOrbitalBody
 pub struct OrbitalBody
 {
     body: SerialOrbitalBody,
+    id: BodyId,
     position: Option<cgmath::Vector3<Kilometers>>
 }
 
 pub struct SolarSystem
 {
+    id: SystemId,
     name: String,
     bodies: Vec<OrbitalBody>,
     time: Option<Second>
@@ -46,6 +48,7 @@ pub struct SolarSystem
 impl SolarSystem
 {
     pub fn new_from_csv(
+        id: SystemId,
         data: &'static str)
     -> Result<Self, Box<dyn Error>> {
         let data_reader = stringreader::StringReader::new(data);
@@ -68,11 +71,13 @@ impl SolarSystem
 
             bodies.push(OrbitalBody { 
                 body: record, 
+                id: bodies.len(),
                 position: None
             });
         }
 
         Ok(Self {
+            id: id,
             name: bodies[0].name().clone(),
             bodies: bodies,
             time: None
@@ -80,15 +85,18 @@ impl SolarSystem
     }
 
     pub fn new_from_known_star(
+        id: SystemId,
         star: &'static str)
     -> Result<Self, Box<dyn Error>> {
         let star_csv = match KNOWN_STARS.get(star).copied() {
             Some(csv) => csv,
             None => return Err(Box::new(StarNotFoundError { star: star }))
         };
-        SolarSystem::new_from_csv(star_csv)
+        SolarSystem::new_from_csv(id, star_csv)
     }
 
+    pub fn id(&self) -> SystemId { self.id }
+
     pub fn name(&self) -> &String { &self.name }
 
     pub fn bodies(&self)
@@ -140,18 +148,24 @@ impl SolarSystem
 
 impl OrbitalBody
 {
+    pub fn id(&self) -> BodyId { self.id }
     pub fn name(&self) -> &String { &self.body.name }
     pub fn radius(&self) -> f32 { self.body.radius as f32 }
     pub fn position(&self) -> cgmath::Vector3<f64> { self.position.unwrap() }
+    pub fn does_orbit(&self) -> bool { self.body.orbits.is_some() }
+    pub fn get_orbits(&self) -> Option<BodyId> { self.body.orbits }
 
-    fn calculate_orbit_at(
+    pub fn orbital_period(&self) -> Second
+    { ((self.body.semi_major_axis.powf(3.0) / self.body.sgp).sqrt() * std::f64::consts::TAU) as u64 }
+    
+    pub fn calculate_orbit_at(
         &self,
         time: Second)
     -> cgmath::Vector3<f64>
     {
         if self.body.orbits.is_none() {
             return cgmath::Vector3::<f64>::new(0.0, 0.0, 0.0);
-        }
+}
 
         let eccentricity = self.body.eccentricity;
 
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