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use crate::utils::{error, gen_util::*};
use tui::style::{Color, Style};
const GOLDEN_RATIO: f32 = 0.618_034; // Approx, good enough for use (also Clippy gets mad if it's too long)
/// Generates random colours. Strategy found from
/// https://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/
pub fn gen_n_styles(num_to_gen: i32) -> Vec<Style> {
fn gen_hsv(h: f32) -> f32 {
let new_val = h + GOLDEN_RATIO;
if new_val > 1.0 {
new_val.fract()
} else {
new_val
}
}
/// This takes in an h, s, and v value of range [0, 1]
/// For explanation of what this does, see
/// https://en.wikipedia.org/wiki/HSL_and_HSV#HSV_to_RGB_alternative
fn hsv_to_rgb(hue: f32, saturation: f32, value: f32) -> (u8, u8, u8) {
fn hsv_helper(num: u32, hu: f32, sat: f32, val: f32) -> f32 {
let k = (num as f32 + hu * 6.0) % 6.0;
val - val * sat * float_max(float_min(k, float_min(4.1 - k, 1.1)), 0.0)
}
(
(hsv_helper(5, hue, saturation, value) * 255.0) as u8,
(hsv_helper(3, hue, saturation, value) * 255.0) as u8,
(hsv_helper(1, hue, saturation, value) * 255.0) as u8,
)
}
// Generate colours
let mut colour_vec: Vec<Style> = vec![
Style::default().fg(Color::Rgb(150, 106, 253)),
Style::default().fg(Color::LightYellow),
Style::default().fg(Color::LightMagenta),
Style::default().fg(Color::LightCyan),
Style::default().fg(Color::Green),
Style::default().fg(Color::Red),
];
let mut h: f32 = 0.4; // We don't need random colours... right?
for _i in 0..(num_to_gen - 6) {
h = gen_hsv(h);
let result = hsv_to_rgb(h, 0.5, 0.95);
colour_vec.push(Style::default().fg(Color::Rgb(result.0, result.1, result.2)));
}
colour_vec
}
pub fn convert_hex_to_color(hex: &str) -> error::Result<Color> {
fn convert_hex_to_rgb(hex: &str) -> error::Result<(u8, u8, u8)> {
if hex.len() == 7 && &hex[0..1] == "#" {
let r = u8::from_str_radix(&hex[1..3], 16)?;
let g = u8::from_str_radix(&hex[3..5], 16)?;
let b = u8::from_str_radix(&hex[5..7], 16)?;
return Ok((r, g, b));
}
Err(error::BottomError::GenericError(format!(
"Colour hex {} is not of valid length. It must be a 7 character string of the form \"#112233\".",
hex
)))
}
let rgb = convert_hex_to_rgb(hex)?;
Ok(Color::Rgb(rgb.0, rgb.1, rgb.2))
}
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