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use std::sync::Arc;
use crate::{hittable::{HitRecord, Hittable, AABB}, material::Material, ray::Ray, vec3::{Point3, Vec3}};
pub struct XYRect {
pub material: Arc<dyn Material>,
pub x0: f64,
pub x1: f64,
pub y0: f64,
pub y1: f64,
pub k: f64,
}
impl XYRect {
fn has_infinite_bounds(&self) -> bool {
self.x0.is_infinite() || self.x1.is_infinite() || self.y0.is_infinite() || self.y1.is_infinite()
}
}
impl Hittable for XYRect {
fn hit(&self, ray: &Ray, t_min: f64, t_max: f64) -> Option<HitRecord> {
let t = (self.k - ray.origin.z) / ray.direction.z;
if t < t_min || t > t_max {
return None;
}
let x = ray.origin.x + t * ray.direction.x;
let y = ray.origin.y + t * ray.direction.y;
if x < self.x0 || x > self.x1 || y < self.y0 || y > self.y1 {
return None;
}
let mut hit_record = HitRecord::new();
hit_record.u = (x - self.x0) / (self.x1 - self.x0);
hit_record.v = (y - self.y0) / (self.y1 - self.y0);
hit_record.t = t;
let outward_normal = Vec3 { x: 0.0, y: 0.0, z: 1.0 };
hit_record.set_face_normal(ray, &outward_normal);
hit_record.material = Some(self.material.clone());
hit_record.p = ray.at(t);
Some(hit_record)
}
fn bounding_box(&self, _: f64, _: f64) -> Option<AABB> {
match self.has_infinite_bounds() {
true => None,
false => Some(AABB { minimum: Point3 { x: self.x0, y: self.y0, z: self.k - 0.0001 }, maximum: Point3 { x: self.x1, y: self.y1, z: self.k + 0.0001 } }),
}
}
}
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