europas 0.0.3

Europa celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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#[derive(Debug, Clone, PartialEq)]
pub struct HeightProfile {
    pub samples_m: Vec<f64>,
}

impl HeightProfile {
    pub fn new(samples_m: Vec<f64>) -> Self {
        Self { samples_m }
    }

    pub fn min_max(&self) -> (f64, f64) {
        let min = self.samples_m.iter().copied().fold(f64::INFINITY, f64::min);
        let max = self
            .samples_m
            .iter()
            .copied()
            .fold(f64::NEG_INFINITY, f64::max);
        (min, max)
    }

    pub fn roughness_index(&self) -> f64 {
        if self.samples_m.len() < 2 {
            return 0.0;
        }
        let total: f64 = self
            .samples_m
            .windows(2)
            .map(|pair| (pair[1] - pair[0]).abs())
            .sum();
        total / (self.samples_m.len() - 1) as f64
    }
}

pub fn ridge_shadow_fraction(solar_elevation_deg: f64, wall_slope_deg: f64) -> f64 {
    ((wall_slope_deg - solar_elevation_deg) / wall_slope_deg.max(1.0)).clamp(0.0, 1.0)
}