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use crate::image::Image;
use crate::ray::Ray;
use crate::vec3::Vec3;
#[derive(Clone)]
pub struct Camera {
pub viewport_height: f64,
pub viewport_width: f64,
pub focal_length: f64,
pub origin: Vec3,
pub horizontal: Vec3,
pub vertical: Vec3,
pub upper_left_corner: Vec3,
}
impl Camera {
pub fn new(image: &Image, viewport_height: f64, focal_length: f64) -> Camera {
let viewport_width = image.aspect_ratio * viewport_height;
let origin = Vec3::new(0.0, 0.0, 0.0);
let horizontal = Vec3::new(viewport_width, 0.0, 0.0);
let vertical = Vec3::new(0.0, viewport_height, 0.0);
Camera {
viewport_height,
viewport_width,
focal_length,
origin,
horizontal,
vertical,
upper_left_corner: origin + vertical / 2.0
- horizontal / 2.0
- Vec3::new(0.0, 0.0, focal_length),
}
}
pub fn get_ray(&self, u: f64, v: f64) -> Ray {
let upper_left_corner = self.origin + self.vertical / 2.0
- self.horizontal / 2.0
- Vec3::new(0.0, 0.0, self.focal_length);
Ray::new(
self.origin,
upper_left_corner + u * self.horizontal - v * self.vertical - self.origin,
)
}
// TODO: Add support for rotation
// TODO: Use forward facing vector
pub fn go_forward(&mut self, go: f64) {
self.origin += Vec3::new(0.0, 0.0, go);
}
// TODO: Use right facing vector
pub fn go_right(&mut self, go: f64) {
self.origin += Vec3::new(go, 0.0, 0.0);
}
}
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