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#![warn(clippy::pedantic, clippy::nursery)]
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn rawwood_12() {
for i in 0..5 {
let raw_wood = wood(584, 668, 40., 12., &WOOD_1);
raw_wood.save(format!("rawwood_12_{}.png", i)).unwrap();
}
}
#[test]
fn brightwood12() {
for i in 0..5 {
let bright = wood(584, 668, 40., 12., &BRIGHT_WOOD);
bright.save(format!("brightwood_12_{}.png", i)).unwrap();
}
}
#[test]
fn rawwood_24() {
for i in 0..5 {
let raw_wood = wood(584, 668, 40., 24., &WOOD_1);
raw_wood.save(format!("rawwood_24_{}.png", i)).unwrap();
}
}
}
struct Noise {
width: usize,
height: usize,
data: Vec<Vec<f64>>,
}
use rand::distributions::{Distribution, Uniform};
impl Noise {
fn gen_noise(width: usize, height: usize) -> Self {
let between = Uniform::from(0.0..1.0);
let mut rng = rand::thread_rng();
let mut noise: Vec<Vec<f64>> = Vec::new();
for _ in 0..height {
let mut vec = Vec::new();
for _ in 0..width {
vec.push(between.sample(&mut rng));
}
noise.push(vec);
}
Self {
width,
height,
data: noise,
}
}
fn sample_smooth_noise(&self, x: f64, y: f64) -> f64 {
let fract_x = x.fract();
let fract_y = y.fract();
let width = self.width;
let height = self.height;
let x1: usize = ((x as usize) + width) % width;
let y1: usize = ((y as usize) + height) % height;
let x2: usize = (x1 + width - 1) % width;
let y2: usize = (y1 + height - 1) % height;
let mut value = 0.0;
value += fract_x * fract_y * self.data[y1][x1];
value += (1. - fract_x) * fract_y * self.data[y1][x2];
value += fract_x * (1. - fract_y) * self.data[y2][x1];
value += (1. - fract_x) * (1. - fract_y) * self.data[y2][x2];
value
}
fn turbulence(&self, x: f64, y: f64, initial_size: f64) -> f64 {
let mut value = 0.0_f64;
let mut size = initial_size;
while size >= 1. {
value += self.sample_smooth_noise(x / size, y / size) * size;
size /= 2.0;
}
128.0 * value / initial_size
}
}
pub struct WoodProfile {
brightness_adjustment: i32,
dark_color: [u8; 3],
light_color: [u8; 3],
}
pub const BRIGHT_WOOD: WoodProfile = WoodProfile {
brightness_adjustment: 20,
dark_color: [120, 70, 70],
light_color: [208, 158, 70],
};
pub const WOOD_1: WoodProfile = WoodProfile {
brightness_adjustment: 0,
dark_color: [120, 70, 70],
light_color: [208, 158, 70],
};
#[must_use]
pub fn wood(
width: u32,
height: u32,
offsetstdev: f64,
length_scale: f64,
wood_profile: &WoodProfile,
) -> image::RgbImage {
use rand::Rng;
let mut imgbuf = image::RgbImage::new(width, height);
let noise = Noise::gen_noise(width as usize, height as usize);
let turb = 14.6;
let turb_size = 32.0;
let mut rng = rand::thread_rng();
let distr = rand_distr::Normal::new(0., offsetstdev).unwrap();
let offset_x = rng.sample(distr);
let offset_y = rng.sample(distr);
let phase = rng.sample(Uniform::from(0.0..std::f64::consts::PI));
for (x, y, pixel) in imgbuf.enumerate_pixels_mut() {
let x_value_times_scale = f64::from(x) - f64::from(width) / 2. + offset_x;
let y_value_times_scale = f64::from(y) - f64::from(height) / 2. + offset_y;
let dist_value_times_scale = x_value_times_scale.hypot(y_value_times_scale)
+ turb * noise.turbulence(f64::from(x), f64::from(y), turb_size) / 256.0;
let sine_value = (dist_value_times_scale / length_scale).mul_add(std::f64::consts::PI, phase)
.sin()
.abs()
.powf(0.4);
*pixel = lerp_pixel(
image::Rgb(wood_profile.dark_color),
image::Rgb(wood_profile.light_color),
sine_value,
);
}
image::imageops::colorops::brighten(&imgbuf, wood_profile.brightness_adjustment)
}
use interpolation::Lerp;
fn lerp_pixel(a: image::Rgb<u8>, b: image::Rgb<u8>, t: f64) -> image::Rgb<u8> {
let t = t as f32;
image::Rgb([
(a.0[0]).lerp(&b.0[0], &t),
(a.0[1]).lerp(&b.0[1], &t),
(a.0[2]).lerp(&b.0[2], &t),
])
}