tcolour/
lib.rs

1pub mod colour;
2pub mod gradient;
3
4pub use colour::*;
5pub use gradient::*;
6
7#[cfg(test)]
8mod tests {
9
10    #[cfg(feature = "image-tests")]
11    use color_eyre::eyre::Result;
12
13    #[cfg(feature = "image-tests")]
14    #[test]
15    pub fn with_noise_test() -> Result<()> {
16        use crate::{BlendMode, Colour, Gradient};
17        use fastnoise_lite::{FastNoiseLite, FractalType, NoiseType};
18        use image::{ImageFormat, Rgba, RgbaImage};
19
20        let mut galaxy_noise = FastNoiseLite::with_seed(0xbeefddd);
21        galaxy_noise.noise_type = NoiseType::OpenSimplex2S;
22        galaxy_noise.fractal_type = FractalType::FBm;
23        galaxy_noise.octaves = 6;
24        galaxy_noise.gain = 0.7f32;
25        galaxy_noise.lacunarity = 2f32;
26        galaxy_noise.frequency = 0.7f32;
27
28        let galaxy_gradient = Gradient(vec![
29            (-1f64, Colour::solid(0f64, 0f64, 0.02f64)), // black
30            (-0.1f64, Colour::solid(0.04f64, 0.04f64, 0.08f64)), // Near-black blue
31            (0.3f64, Colour::solid(0.1f64, 0.08f64, 0.24f64)), // Deep indigo
32            (0.6f64, Colour::solid(0.20f64, 0.08f64, 0.45f64)), // Dark purple-blue
33            (0.75f64, Colour::solid(0.40f64, 0.12f64, 0.55f64)), // Soft electric purple
34            (0.7f64, Colour::solid(0.55f64, 0.20f64, 0.65f64)), // Muted magenta-blue
35            (0.9f64, Colour::solid(0.65f64, 0.30f64, 0.75f64)), // Soft pinkish-purple
36            (1f64, Colour::solid(0.65f64, 0.40f64, 0.80f64)), // Dim glowing violet
37        ]);
38
39        let mut star_noise = FastNoiseLite::with_seed(0xbeefaaa);
40        star_noise.noise_type = NoiseType::ValueCubic;
41        star_noise.fractal_type = FractalType::FBm;
42        star_noise.octaves = 4;
43        star_noise.gain = 1.0f32;
44        star_noise.lacunarity = 4f32;
45        star_noise.frequency = 2f32;
46
47        let star_gradient = Gradient(vec![
48            (0.95f64, Colour::transparent()),
49            // (0.95f64, Colour::solid(0.0f64, 0.0f64, 0.0f64)), // Below 0.8: no star (dark)
50            (0.975f64, Colour::solid(0.9f64, 0.9f64, 1.0f64)), // Brighter bluish-white
51            (0.9875f64, Colour::solid(1.0f64, 0.95f64, 0.9f64)), // Slight warm tint (subtle yellowish)
52            (1.0f64, Colour::solid(1.0f64, 1.0f64, 1.0f64)),     // Full white highlight
53        ]);
54
55        let mut image = RgbaImage::new(512, 512);
56        for y in 0..image.height() {
57            for x in 0..image.width() {
58                image.put_pixel(
59                    x,
60                    y,
61                    Rgba(
62                        galaxy_gradient
63                            .sample(
64                                galaxy_noise.get_noise_2d(x as f32 / 512f32, y as f32 / 512f32)
65                                    as f64,
66                            )
67                            .blend(
68                                star_gradient.sample(
69                                    star_noise.get_noise_2d(x as f32 / 512f32, y as f32 / 512f32)
70                                        as f64,
71                                ),
72                                BlendMode::HardLight,
73                            )
74                            .into(),
75                    ),
76                );
77            }
78        }
79        image.save_with_format("test/noise.png", ImageFormat::Png)?;
80        Ok(())
81    }
82}
tcolour/lib.rs

tcolour/
lib.rs
