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|
pub mod orbit;
pub mod ship;
use serde::{Deserialize};
use crate::known_stars::*;
use crate::solar_system::orbit::*;
use crate::solar_system::ship::*;
use crate::timeman::Second;
use std::error::Error;
const GRAVITATIONAL_CONSTANT: f64 = 6.67408e-20;
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 CSVOrbitalBody
{
name: String,
orbits: Option<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
{
name: String,
mass: Kilograms,
radius: Kilometers,
sgp: f64,
orbit: Option<StaticOrbit>,
position: Option<cgmath::Vector3<Kilometers>>
}
pub struct SolarSystem
{
id: SystemId,
name: String,
bodies: Vec<OrbitalBody>,
ships: Vec<Ship>
}
impl SolarSystem
{
pub fn new_from_csv(
id: SystemId,
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 mut record: CSVOrbitalBody = result?;
match record.orbits {
Some(orbits) => {
if record.sgp == 0.0 {
record.sgp = (bodies[orbits].mass + record.mass) * GRAVITATIONAL_CONSTANT;
}
}
None => {}
}
if record.radius == 0.0 { continue; }
println!("New body: {:?}", record);
bodies.push(OrbitalBody {
name: record.name,
mass: record.mass,
radius: record.radius,
sgp: record.sgp,
orbit: Some(StaticOrbit {
parent: record.orbits,
eccentricity: record.eccentricity,
inclination: record.inclination,
long_asc_node: record.long_asc_node,
long_periapsis: record.long_periapsis,
mean_long: record.mean_long,
semi_major_axis: record.semi_major_axis
}),
position: None
});
}
Ok(Self {
id: id,
name: bodies[0].name().clone(),
bodies: bodies,
ships: vec![]
})
}
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(id, star_csv)
}
pub fn id(&self) -> SystemId { self.id }
pub fn name(&self) -> &String { &self.name }
pub fn bodies(&self)
-> &[OrbitalBody]
{
self.bodies.as_slice()
}
pub fn body_position(
&self,
body: &OrbitalBody)
-> cgmath::Vector3<Kilometers>
{
match &body.orbit {
Some(orbit) => {
match orbit.parent {
Some(parent) => {
let this_pos = body.position();
let parent_pos = self.bodies[parent].position();
this_pos + parent_pos
},
None => body.position()
}
},
None => body.position()
}
}
pub fn update(
&mut self,
time: Second)
{
self.bodies.iter_mut().for_each(|body| {
body.position = Some(body.calculate_orbit_at(time));
});
}
}
impl OrbitalBody
{
pub fn name(&self) -> &String { &self.name }
pub fn radius(&self) -> f32 { self.radius as f32 }
pub fn position(&self) -> cgmath::Vector3<f64> { self.position.unwrap() }
pub fn does_orbit(&self) -> bool {
match &self.orbit {
Some(orbit) => orbit.parent.is_some(),
None => false
}
}
pub fn get_orbits(&self) -> Option<BodyId> {
match &self.orbit {
Some(orbit) => orbit.parent(),
None => None
}
}
pub fn orbital_period(&self) -> Second
{
match &self.orbit {
Some(v) => v.period(self),
None => return 0
}
}
pub fn calculate_orbit_at(
&self,
time: Second)
-> cgmath::Vector3<Kilometers>
{
match &self.orbit {
Some(orbit) => orbit.calculate_position_at(self, time),
None => cgmath::vec3(0.0, 0.0, 0.0)
}
}
}
|
