77 lines
2.2 KiB
Rust
77 lines
2.2 KiB
Rust
// Sources:
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// https://iquilezles.org/articles/palettes/
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// http://dev.thi.ng/gradients/
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use rand::prelude::*;
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use rand::rngs::SmallRng;
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use lazy_static::lazy_static;
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#[derive(Clone, Copy, PartialEq, Debug)]
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pub struct ColorPalette {
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a: [f64; 3],
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b: [f64; 3],
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c: [f64; 3],
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d: [f64; 3],
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}
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impl ColorPalette {
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pub fn _new(a: [f64; 3], b: [f64; 3], c: [f64; 3], d: [f64; 3]) -> Self {
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ColorPalette { a, b, c, d }
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}
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pub fn get(&self, t: f64) -> [f64; 3] {
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[
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(self.a[0] + self.b[0] * f64::cos(std::f64::consts::TAU * (self.c[0] * t + self.d[0])))
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* 255.0,
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(self.a[1] + self.b[1] * f64::cos(std::f64::consts::TAU * (self.c[1] * t + self.d[1])))
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* 255.0,
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(self.a[2] + self.b[2] * f64::cos(std::f64::consts::TAU * (self.c[2] * t + self.d[2])))
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* 255.0,
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]
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}
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pub fn _get_u8(&self, t: u8) -> [f64; 3] {
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assert!(t > 0, "t must be greater than zero!");
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self.get((2f64.powi(-(t.ilog2() as i32))) * (t as f64 + 0.5f64) - 1.0f64)
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}
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pub fn get_uuid(&self, t: uuid::Uuid) -> [f64; 3] {
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// self.get(t.as_u128() as f64 / (u128::MAX) as f64)
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let mut r = SmallRng::seed_from_u64(t.as_u128() as u64);
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self.get(r.gen_range(0.0..1.0f64))
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}
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pub fn get_ordered(&self, t: uuid::Uuid, ordered_uuids: &Vec<uuid::Uuid>)
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-> [f64; 3] {
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let index = ordered_uuids.iter().position(|&x| x == t).expect("uuid must be in list of uuids");
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return self.get(Self::space_evenly(index))
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}
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fn space_evenly(x: usize) -> f64 {
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let e: usize = (x.ilog2() + 1) as usize;
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let d: usize = (2usize.pow(e as u32)) as usize;
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let n: usize = (2*x + 1) % d;
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return (n as f64) / (d as f64);
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}
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}
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#[non_exhaustive]
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pub struct Palettes;
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#[allow(dead_code)]
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impl Palettes {
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pub const RAINBOW: ColorPalette = ColorPalette {
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a: [0.500, 0.500, 0.500],
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b: [0.700, 0.700, 0.700],
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c: [0.800, 0.800, 0.800],
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d: [0.000, 0.333, 0.667],
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};
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pub const YELLOW_PINK: ColorPalette = ColorPalette {
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a: [0.500, 0.500, 0.320],
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b: [0.500, 0.500, 0.500],
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c: [0.100, 0.500, 0.360],
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d: [0.000, 0.000, 0.650],
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};
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}
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