ioss 0.0.3

Io celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Crater {
    pub name: &'static str,
    pub diameter_km: f64,
    pub depth_km: f64,
    pub age_gyr: f64,
}

impl Crater {
    pub fn depth_to_diameter_ratio(&self) -> f64 {
        self.depth_km / self.diameter_km
    }
}

pub fn unnamed_crater_a() -> Crater {
    Crater {
        name: "Unnamed A",
        diameter_km: 10.0,
        depth_km: 0.3,
        age_gyr: 0.001,
    }
}

pub fn unnamed_crater_b() -> Crater {
    Crater {
        name: "Unnamed B",
        diameter_km: 5.0,
        depth_km: 0.1,
        age_gyr: 0.0005,
    }
}

pub fn crater_class(diameter_km: f64) -> &'static str {
    if diameter_km < 15.0 {
        "simple"
    } else if diameter_km < 300.0 {
        "complex"
    } else {
        "multi-ring"
    }
}