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mod lerp;
mod poly;
use lerp::Lerp;
use poly::Poly;
pub struct Bezier {
pub degree: usize,
pub vx: Vec<f32>,
pub vy: Vec<f32>,
pub px: Poly,
pub py: Poly,
pub dpx: Poly,
pub dpy: Poly,
}
impl Bezier {
pub fn new() -> Bezier {
Bezier {
vx: Vec::<f32>::new(),
vy: Vec::<f32>::new(),
px: Poly::new(vec![]),
py: Poly::new(vec![]),
dpy: Poly::new(vec![]),
dpx: Poly::new(vec![]),
degree: 0,
}
}
pub fn push(&mut self, x: i32, y: i32) {
self.vx.push(x as f32);
self.vy.push(y as f32);
self.px = Lerp::new(&self.vx).to_poly();
self.py = Lerp::new(&self.vy).to_poly();
self.dpx = self.px.deriv();
self.dpy = self.py.deriv();
self.degree += 1;
}
pub fn remove(&mut self, index: usize) {
self.vx.remove(index);
self.vy.remove(index);
self.px = Lerp::new(&self.vx).to_poly();
self.py = Lerp::new(&self.vy).to_poly();
self.dpx = self.px.deriv();
self.dpy = self.py.deriv();
self.degree -= 1;
}
pub fn show_x(&self) -> String {
let mut s = String::new();
for i in 0..self.degree {
s.push_str(&self.vx[i].to_string());
if i < self.degree - 1 {
s.push_str(", ");
}
}
s
}
pub fn show_y(&self) -> String {
let mut s = String::new();
for i in 0..self.degree {
s.push_str(&self.vy[i].to_string());
if i < self.degree - 1 {
s.push_str(", ");
}
}
s
}
}
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