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use std::sync::Arc;
use crate::{hittable::{HitRecord, Hittable, AABB}, ray::Ray, util::degrees_to_radians, vec3::{Point3, Vec3}};
pub struct RotateZ {
hittable: Arc<dyn Hittable>,
sin_theta: f64,
cos_theta: f64,
aabb: Option<AABB>,
}
impl RotateZ {
pub fn new(hittable: Arc<dyn Hittable>, angle: f64) -> Self {
let radians = degrees_to_radians(angle);
let sin_theta = radians.sin();
let cos_theta = radians.cos();
match hittable.bounding_box(0.0, 1.0) { // TODO: passing in 0.0 and 1.0 for time seems suspicious.
None => Self { hittable, sin_theta, cos_theta, aabb: None },
Some(aabb) => {
let mut min = Point3 { x: f64::INFINITY, y: f64::INFINITY, z: f64::INFINITY };
let mut max = Point3 { x: -f64::INFINITY, y: -f64::INFINITY, z: -f64::INFINITY };
for i in 0..2 {
for j in 0..2 {
for k in 0..2 {
let x = i as f64 * aabb.maximum.x + (1.0 - i as f64) * aabb.minimum.x;
let y = j as f64 * aabb.maximum.y + (1.0 - j as f64) * aabb.minimum.y;
let z = k as f64 * aabb.maximum.z + (1.0 - k as f64) * aabb.minimum.z;
let new_x = cos_theta * x + sin_theta * y;
let new_y = -sin_theta * x + cos_theta * y;
let tester = Vec3 { x: new_x, z, y: new_y };
for c in 0..3 {
*min.get_mut(c).unwrap() = min.get(c).unwrap().min(*tester.get(c).unwrap());
*max.get_mut(c).unwrap() = max.get(c).unwrap().max(*tester.get(c).unwrap());
}
}
}
}
let aabb = AABB { minimum: min, maximum: max };
Self {
hittable,
sin_theta,
cos_theta,
aabb: Some(aabb),
}
}
}
}
}
impl Hittable for RotateZ {
fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord> {
let mut origin = ray.origin.clone();
let mut direction = ray.direction.clone();
origin.x = self.cos_theta * ray.origin.x - self.sin_theta * ray.origin.y;
origin.y = self.sin_theta * ray.origin.x + self.cos_theta * ray.origin.y;
direction.x = self.cos_theta * ray.direction.x - self.sin_theta * ray.direction.y;
direction.y = self.sin_theta * ray.direction.x + self.cos_theta * ray.direction.y;
let rotated_ray = Ray { origin, direction, time: ray.time };
let mut hit_record = self.hittable.hit(&rotated_ray, t_min, t_max)?;
let mut p = hit_record.p.clone();
let mut normal = hit_record.normal.clone();
p.x = self.cos_theta * hit_record.p.x + self.sin_theta * hit_record.p.y;
p.y = -self.sin_theta * hit_record.p.x + self.cos_theta * hit_record.p.y;
normal.x = self.cos_theta * hit_record.normal.x + self.sin_theta * hit_record.normal.y;
normal.y = -self.sin_theta * hit_record.normal.x + self.cos_theta * hit_record.normal.y;
hit_record.p = p;
hit_record.set_face_normal(&ray, &normal);
Some(hit_record)
}
fn bounding_box(&self, _: f64, _: f64) -> Option<AABB> {
self.aabb.clone()
}
}
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