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use serde::{Deserialize};
use crate::{known_stars::{KNOWN_STARS, StarNotFoundError}, timeman::Second};
use std::error::Error;
const GRAVITATIONAL_CONSTANT: f64 = 6.67408e-11;
pub type Kilograms = f64;
pub type Kilometers = f64;
pub type Percentage = f64;
pub type Angle = f64;
pub type BodyId = usize;
pub type SystemId = usize;
#[derive(Debug, Deserialize)]
pub struct SerialOrbitalBody
{
name: String,
orbits: BodyId,
mass: Kilograms,
radius: Kilometers,
eccentricity: Percentage,
inclination: Angle,
long_asc_node: Angle,
long_periapsis: Angle,
sgp: f64,
mean_long: Angle,
semi_major_axis: Kilometers,
}
pub struct OrbitalBody
{
body: SerialOrbitalBody,
position: Option<(Second, cgmath::Point3<Kilometers>)>
}
pub struct SolarSystem
{
name: String,
bodies: Vec<OrbitalBody>,
}
impl SolarSystem
{
pub fn new_from_csv(
data: &'static str)
-> Result<Self, Box<dyn Error>> {
let data_reader = stringreader::StringReader::new(data);
let mut body_reader = csv::Reader::from_reader(data_reader);
let mut bodies = Vec::<OrbitalBody>::new();
for result in body_reader.deserialize() {
let record: SerialOrbitalBody = result?;
println!("New body: {:?}", record);
bodies.push(OrbitalBody { body: record, position: None });
}
Ok(Self {
name: bodies[0].name().clone(),
bodies: bodies,
})
}
pub fn new_from_known_star(
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)
}
pub fn name(&self) -> &String { &self.name }
pub fn bodies(&self)
-> &[OrbitalBody]
{
self.bodies.as_slice()
}
}
impl OrbitalBody
{
pub fn name(&self) -> &String { &self.body.name }
pub fn radius(&self) -> f32 { self.body.radius as f32 }
pub fn position(&self, time: Second)
-> Option<cgmath::Point3<Kilometers>>
{
match self.position {
Some((cache_time, pos)) => {
if time == cache_time {
return Some(pos);
}
return None;
},
None => None
}
}
fn calculate_orbit(
&self,
time: i64)
-> cgmath::Point3<Kilometers> {
cgmath::Point3 { x: 0.0, y: 0.0, z: 0.0 }
/*let arg_periapsis = self.long_periapsis - self.long_asc_node;
let mean_angular_motion: f64 = (
self.sgp as f64 / (self.semi_major_axis as f64).powf(3.0)
).sqrt();
let mean_anomaly = (self.mean_long - self.long_periapsis) + (mean_angular_motion * time as f64) as f32;
let mut eccentric_anomaly = mean_anomaly + self.eccentricity * mean_anomaly.sin();
for _ in 0..100 {
let new_eccentric = eccentric_anomaly +
(mean_anomaly - eccentric_anomaly + self.eccentricity * eccentric_anomaly.sin()) /
(1.0 - self.eccentricity * eccentric_anomaly.cos());
if (new_eccentric - eccentric_anomaly).abs() < 1e-6 {
eccentric_anomaly = new_eccentric;
break;
}
eccentric_anomaly = new_eccentric;
}
let beta = self.eccentricity / 1.0 + (1.0 - self.eccentricity * self.eccentricity).sqrt();
let true_anomaly = eccentric_anomaly + 2.0 *
((beta * eccentric_anomaly.sin()) / (1.0 - beta * eccentric_anomaly.cos())).atan();
let radius: f64 = self.semi_major_axis * (1.0 - self.eccentricity * eccentric_anomaly.cos()) as f64;
let ohm_sin = self.long_asc_node.sin();
let ohm_cos = self.long_asc_node.cos();
let inc_sin = self.inclination.sin();
let inc_cos = self.inclination.cos();
let per_anom_sin = (arg_periapsis + true_anomaly).sin();
let per_anom_cos = (arg_periapsis + true_anomaly).cos();
let x: f32 = (radius as f32) * (
(ohm_cos * per_anom_cos) -
(ohm_sin * per_anom_sin * inc_cos));
let y: f32 = (radius as f32) * (
(ohm_sin * per_anom_cos) +
(ohm_cos * per_anom_sin * inc_cos));
let z: f32 = (radius as f32) * (inc_sin * per_anom_sin);
OrbitState {
position: cgmath::Vector3::new(x, y, z)
}*/
}
}
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