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use crate::matrix::Matrix;
use crate::vector::Vec3;
#[derive(Debug)]
pub struct Camera
{
position: Vec3<f32>,
target: Vec3<f32>,
}
impl Camera
{
pub fn set_position(&mut self, position: Vec3<f32>)
{
self.position = position;
}
#[must_use]
pub fn position(&self) -> &Vec3<f32>
{
&self.position
}
#[must_use]
pub fn position_mut(&mut self) -> &mut Vec3<f32>
{
&mut self.position
}
pub fn set_target(&mut self, target: Vec3<f32>)
{
self.target = target;
}
#[must_use]
pub fn target(&self) -> &Vec3<f32>
{
&self.target
}
/// Returns the normalized direction to the current target.
#[must_use]
pub fn target_direction(&self) -> Vec3<f32>
{
-(&self.position - &self.target).normalize()
}
/// Returns the right direction (normalized) relative from where the camera is
/// currently looking.
#[must_use]
pub fn right(&self) -> Vec3<f32>
{
let rev_target_direction = (&self.position - &self.target).normalize();
Vec3::UP.cross(&rev_target_direction).normalize()
}
/// Returns the left direction (normalized) relative from where the camera is
/// currently looking.
#[must_use]
pub fn left(&self) -> Vec3<f32>
{
-self.right()
}
/// Returns the up direction (normalized) relative from where the camera is currently
/// looking.
#[must_use]
pub fn up(&self) -> Vec3<f32>
{
let rev_target_direction = (&self.position - &self.target).normalize();
rev_target_direction.cross(&self.right())
}
/// Returns the down direction (normalized) relative from where the camera is
/// currently looking.
#[must_use]
pub fn down(&self) -> Vec3<f32>
{
-self.up()
}
pub(crate) fn new() -> Self
{
let position = Vec3 { x: 0.0, y: 0.0, z: 3.0 };
Self { position, target: Vec3::default() }
}
pub(crate) fn as_matrix(&self) -> Matrix<f32, 4, 4>
{
let mut matrix = Matrix::new();
matrix.look_at(&self.position, &self.target, &Vec3::UP);
matrix
}
}
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