Bill Thiede
e19ec20c7b
Add debugging hit DebugHit. Move some color helpers from mandelbrot to colors mod. Implement Texture trait for [f32;3]
47 lines
1.2 KiB
Rust
47 lines
1.2 KiB
Rust
use rand::{self, Rng};
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use crate::vec3::Vec3;
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// HSV values in [0..1]
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// returns [r, g, b] values from 0 to 255
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//From https://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/
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pub fn hsv_to_rgb(h: f32, s: f32, v: f32) -> Vec3 {
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let h_i = (h * 6.) as i32;
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let f = h * 6. - h_i as f32;
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let p = v * (1. - s);
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let q = v * (1. - f * s);
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let t = v * (1. - (1. - f) * s);
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match h_i {
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0 => Vec3::new(v, t, p),
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1 => Vec3::new(q, v, p),
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2 => Vec3::new(p, v, t),
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3 => Vec3::new(p, q, v),
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4 => Vec3::new(t, p, v),
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5 => Vec3::new(v, p, q),
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_ => panic!("Unknown H value {}", h_i),
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}
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}
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pub fn generate_rainbow(num: usize) -> Vec<Vec3> {
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(0..num)
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.map(|n| {
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let h = n as f32 / num as f32;
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hsv_to_rgb(h, 0.99, 0.99)
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})
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.collect()
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}
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pub fn generate_palette(num: usize) -> Vec<Vec3> {
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let mut rng = rand::thread_rng();
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let mut random = || rng.gen();
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// use golden ratio
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let golden_ratio_conjugate = 0.618_034;
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let mut h = random();
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(0..num)
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.map(|_| {
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h += golden_ratio_conjugate;
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h %= 1.0;
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hsv_to_rgb(h, 0.99, 0.99)
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})
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.collect()
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}
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