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use crate::{color::Color, Sample};
pub struct Rainbow;
impl Sample for Rainbow {
fn sample(&mut self, x: f64, _y: f64) -> Color {
static PI: f64 = 3.14;
let x = x * PI * 2.0;
return Color {
r: (x + PI / 3.0 * 0.0).sin() * 0.5 + 0.5,
g: (x + PI / 3.0 * 2.0).sin() * 0.5 + 0.5,
b: (x + PI / 3.0 * 4.0).sin() * 0.5 + 0.5,
};
}
}
pub struct Sequence(pub Vec<Color>);
impl Sample for Sequence {
fn sample(&mut self, x: f64, _y: f64) -> Color {
self.0[(x * self.0.len() as f64).floor() as usize % self.0.len()]
}
}
pub struct Gradient(pub Vec<Color>);
impl Sample for Gradient {
fn sample(&mut self, x: f64, _y: f64) -> Color {
let index = x * self.0.len() as f64;
let index_int = index.floor() as usize;
let index_error = index % 1.0;
let a = self.0[index_int % self.0.len()];
let b = self.0[(index_int + 1) % self.0.len()];
Color::mix(a, b, index_error)
}
}
pub struct Solid(pub Color);
impl Sample for Solid {
fn sample(&mut self, _x: f64, _y: f64) -> Color {
self.0
}
}
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