51 lines
1.3 KiB
Rust
51 lines
1.3 KiB
Rust
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// Sources:
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// https://iquilezles.org/articles/palettes/
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// http://dev.thi.ng/gradients/
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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(6.28318*(self.c[0]*t+self.d[0])))*255.0,
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(self.a[1] + self.b[1]*f64::cos(6.28318*(self.c[1]*t+self.d[1])))*255.0,
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(self.a[2] + self.b[2]*f64::cos(6.28318*(self.c[2]*t+self.d[2])))*255.0,
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]
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}
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pub fn get_u8(&self, t: u8, n: u8) -> [f64; 3] {
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assert!(t>0, "t must be greater than zero!");
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assert!(n>0, "There cannot be zero points!");
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self.get((t-1) as f64 / (n-1) 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: [0.500,0.500,0.500],
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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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