geom3d 0.2.0

Data structures and algorithms for 3D geometric modeling.
Documentation 
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use super::Curve;
use crate::{Float, Point3, Quat, Vec3};

#[derive(Debug)]
pub struct Circle {
    pub center: Point3,
    pub radius: Float,
    pub axis: Vec3,
    pub ref_dir: Vec3,
}

impl Curve for Circle {
    fn get_point(&self, angle: Float) -> Point3 {
        let rotation = Quat::from_axis_angle(self.axis, angle);
        self.center + rotation * self.ref_dir * self.radius
    }

    fn project(&self, point: Point3) -> Float {
        let y_axis = self.axis.cross(self.ref_dir).normalize();
        let direction = point - self.center;
        let x = direction.dot(self.ref_dir);
        let y = direction.dot(y_axis);
        let angle = y.atan2(x);
        if angle >= 0.0 {
            angle
        } else {
            angle + crate::consts::TAU
        }
    }
}