Colorous ======== [

](https://github.com/dtolnay/colorous) [

](https://crates.io/crates/colorous) [

](https://docs.rs/colorous) [

](https://github.com/dtolnay/colorous/actions?query=branch%3Amaster) This crate provides a collection of sequential, diverging and categorical color schemes ported from [d3-scale-chromatic]. Each color scheme may be sampled using either a rational index `i/n` or a continuous float `0 ≤ t ≤ 1`. - `pub fn eval_rational(&self, i: usize, n: usize) -> Color` - `pub fn eval_continuous(&self, t: f64) -> Color` [d3-scale-chromatic]: https://github.com/d3/d3-scale-chromatic viridis

## Example ```rust let gradient = colorous::VIRIDIS; for i in 0..100 { println!("{:x}", gradient.eval_rational(i, 100)); } ```
## Sequential (multi-hue) # colorous::TURBO turbo

The “turbo” color scheme by [Anton Mikhailov](https://ai.googleblog.com/2019/08/turbo-improved-rainbow-colormap-for.html). # colorous::VIRIDIS viridis

The “viridis” perceptually-uniform color scheme designed by [van der Walt, Smith and Firing](https://bids.github.io/colormap/) for matplotlib. # colorous::INFERNO inferno

The “inferno” perceptually-uniform color scheme designed by [van der Walt and Smith](https://bids.github.io/colormap/) for matplotlib. # colorous::MAGMA magma

The “magma” perceptually-uniform color scheme designed by [van der Walt and Smith](https://bids.github.io/colormap/) for matplotlib. # colorous::PLASMA plasma

The “plasma” perceptually-uniform color scheme designed by [van der Walt and Smith](https://bids.github.io/colormap/) for matplotlib. # colorous::CIVIDIS cividis

The “cividis” color vision deficiency-optimized color scheme designed by [Nuñez, Anderton, and Renslow](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0199239). # colorous::WARM warm

A 180° rotation of [Niccoli’s perceptual rainbow](https://mycarta.wordpress.com/2013/02/21/perceptual-rainbow-palette-the-method/). # colorous::COOL cool

[Niccoli’s perceptual rainbow](https://mycarta.wordpress.com/2013/02/21/perceptual-rainbow-palette-the-method/). # colorous::CUBEHELIX

[Green’s default Cubehelix](https://www.mrao.cam.ac.uk/~dag/CUBEHELIX/). # colorous::BLUE_GREEN BuGn

# colorous::BLUE_PURPLE BuPu

# colorous::GREEN_BLUE GnBu

# colorous::ORANGE_RED OrRd

# colorous::PURPLE_BLUE_GREEN PuBuGn

# colorous::PURPLE_BLUE PuBu

# colorous::PURPLE_RED PuRd

# colorous::RED_PURPLE RdPu

# colorous::YELLOW_GREEN_BLUE YlGnBu

# colorous::YELLOW_GREEN YlGn

# colorous::YELLOW_ORANGE_BROWN YlOrBr

# colorous::YELLOW_ORANGE_RED YlOrRd

## Sequential (single-hue) # colorous::BLUES Blues

# colorous::GREENS Greens

# colorous::GREYS Greys

# colorous::ORANGES Oranges

# colorous::PURPLES Purples

# colorous::REDS Reds

## Diverging # colorous::BROWN_GREEN BrBG

# colorous::PURPLE_GREEN PRGn

# colorous::PINK_GREEN PiYG

# colorous::PURPLE_ORANGE PuOr

# colorous::RED_BLUE RdBu

# colorous::RED_GREY RdGy

# colorous::RED_YELLOW_BLUE RdYlBu

# colorous::RED_YELLOW_GREEN RdYlGn

# colorous::SPECTRAL

## Cyclical # colorous::RAINBOW rainbow

The cyclical [less-angry rainbow](http://bl.ocks.org/mbostock/310c99e53880faec2434) color scheme. # colorous::SINEBOW sinebow

The “sinebow” color scheme by [Jim Bumgardner](https://krazydad.com/tutorials/makecolors.php) and [Charlie Loyd](http://basecase.org/env/on-rainbows).
## Categorical Categorical color schemes are exposed simply as an array `[Color; N]`. # colorous::CATEGORY10

# colorous::ACCENT Accent

# colorous::DARK2 Dark2

# colorous::PAIRED Paired

# colorous::PASTEL1 Pastel1

# colorous::PASTEL2 Pastel2

# colorous::SET1 Set1

# colorous::SET2 Set2

# colorous::SET3 Set3

# colorous::TABLEAU10

Ten categorical colors authored by Tableau as part of [Tableau 10](https://www.tableau.com/about/blog/2016/7/colors-upgrade-tableau-10-56782).
## License Licensed under the Apache License, Version 2.0.