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use crate::{rgb::Rgb, Color};
/// Linear color gradient between two color stops
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Gradient {
/// Start Color of Gradient
pub start: Rgb,
/// End Color of Gradient
pub end: Rgb,
}
impl Gradient {
/// Creates a new [Gradient] with two [Rgb] colors, `start` and `end`
#[inline]
pub const fn new(start: Rgb, end: Rgb) -> Self {
Self { start, end }
}
pub const fn from_color_rgb(start: Color, end: Color) -> Self {
let start_grad = match start {
Color::Rgb(r, g, b) => Rgb { r, g, b },
_ => Rgb { r: 0, g: 0, b: 0 },
};
let end_grad = match end {
Color::Rgb(r, g, b) => Rgb { r, g, b },
_ => Rgb { r: 0, g: 0, b: 0 },
};
Self {
start: start_grad,
end: end_grad,
}
}
/// Computes the [Rgb] color between `start` and `end` for `t`
pub fn at(&self, t: f32) -> Rgb {
self.start.lerp(self.end, t)
}
/// Returns the reverse of `self`
#[inline]
pub const fn reverse(&self) -> Self {
Self::new(self.end, self.start)
}
#[allow(dead_code)]
pub fn build(&self, text: &str, target: TargetGround) -> String {
let delta = 1.0 / text.len() as f32;
let mut result = text.char_indices().fold(String::new(), |mut acc, (i, c)| {
let temp = format!(
"\x1B[{}m{}",
self.at(i as f32 * delta).ansi_color_code(target),
c
);
acc.push_str(&temp);
acc
});
result.push_str("\x1B[0m");
result
}
}
#[allow(dead_code)]
pub fn build_all_gradient_text(text: &str, foreground: Gradient, background: Gradient) -> String {
let delta = 1.0 / text.len() as f32;
let mut result = text.char_indices().fold(String::new(), |mut acc, (i, c)| {
let step = i as f32 * delta;
let temp = format!(
"\x1B[{};{}m{}",
foreground
.at(step)
.ansi_color_code(TargetGround::Foreground),
background
.at(step)
.ansi_color_code(TargetGround::Background),
c
);
acc.push_str(&temp);
acc
});
result.push_str("\x1B[0m");
result
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TargetGround {
Foreground,
Background,
}
impl TargetGround {
#[inline]
pub const fn code(&self) -> u8 {
match self {
Self::Foreground => 30,
Self::Background => 40,
}
}
}
pub trait ANSIColorCode {
fn ansi_color_code(&self, target: TargetGround) -> String;
}
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