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|
use super::palette::Palette;
use super::ShapeStyle;
use plotters_backend::{BackendColor, BackendStyle};
use std::marker::PhantomData;
/// Any color representation
pub trait Color {
/// Normalize this color representation to the backend color
fn to_backend_color(&self) -> BackendColor;
/// Convert the RGB representation to the standard RGB tuple
#[inline(always)]
fn rgb(&self) -> (u8, u8, u8) {
self.to_backend_color().rgb
}
/// Get the alpha channel of the color
#[inline(always)]
fn alpha(&self) -> f64 {
self.to_backend_color().alpha
}
/// Mix the color with given opacity
fn mix(&self, value: f64) -> RGBAColor {
let (r, g, b) = self.rgb();
let a = self.alpha() * value;
RGBAColor(r, g, b, a)
}
/// Convert the color into the RGBA color which is internally used by Plotters
fn to_rgba(&self) -> RGBAColor {
let (r, g, b) = self.rgb();
let a = self.alpha();
RGBAColor(r, g, b, a)
}
/// Make a filled style form the color
fn filled(&self) -> ShapeStyle
where
Self: Sized,
{
Into::<ShapeStyle>::into(self).filled()
}
/// Make a shape style with stroke width from a color
fn stroke_width(&self, width: u32) -> ShapeStyle
where
Self: Sized,
{
Into::<ShapeStyle>::into(self).stroke_width(width)
}
}
impl<T: Color> Color for &'_ T {
fn to_backend_color(&self) -> BackendColor {
<T as Color>::to_backend_color(*self)
}
}
/// The RGBA representation of the color, Plotters use RGBA as the internal representation
/// of color
#[derive(Copy, Clone, PartialEq, Debug, Default)]
pub struct RGBAColor(pub(crate) u8, pub(crate) u8, pub(crate) u8, pub(crate) f64);
impl Color for RGBAColor {
#[inline(always)]
fn to_backend_color(&self) -> BackendColor {
BackendColor {
rgb: (self.0, self.1, self.2),
alpha: self.3,
}
}
}
/// A color in the given palette
pub struct PaletteColor<P: Palette>(usize, PhantomData<P>);
impl<P: Palette> PaletteColor<P> {
/// Pick a color from the palette
pub fn pick(idx: usize) -> PaletteColor<P> {
PaletteColor(idx % P::COLORS.len(), PhantomData)
}
}
impl<P: Palette> Color for PaletteColor<P> {
#[inline(always)]
fn to_backend_color(&self) -> BackendColor {
BackendColor {
rgb: P::COLORS[self.0],
alpha: 1.0,
}
}
}
/// The color described by its RGB value
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug, Default)]
pub struct RGBColor(pub u8, pub u8, pub u8);
impl BackendStyle for RGBAColor {
fn color(&self) -> BackendColor {
self.to_backend_color()
}
}
impl Color for RGBColor {
#[inline(always)]
fn to_backend_color(&self) -> BackendColor {
BackendColor {
rgb: (self.0, self.1, self.2),
alpha: 1.0,
}
}
}
impl BackendStyle for RGBColor {
fn color(&self) -> BackendColor {
self.to_backend_color()
}
}
/// The color described by HSL color space
pub struct HSLColor(pub f64, pub f64, pub f64);
impl Color for HSLColor {
#[inline(always)]
#[allow(clippy::many_single_char_names)]
fn to_backend_color(&self) -> BackendColor {
let (h, s, l) = (
self.0.min(1.0).max(0.0),
self.1.min(1.0).max(0.0),
self.2.min(1.0).max(0.0),
);
if s == 0.0 {
let value = (l * 255.0).round() as u8;
return BackendColor {
rgb: (value, value, value),
alpha: 1.0,
};
}
let q = if l < 0.5 {
l * (1.0 + s)
} else {
l + s - l * s
};
let p = 2.0 * l - q;
let cvt = |mut t| {
if t < 0.0 {
t += 1.0;
}
if t > 1.0 {
t -= 1.0;
}
let value = if t < 1.0 / 6.0 {
p + (q - p) * 6.0 * t
} else if t < 1.0 / 2.0 {
q
} else if t < 2.0 / 3.0 {
p + (q - p) * (2.0 / 3.0 - t) * 6.0
} else {
p
};
(value * 255.0).round() as u8
};
BackendColor {
rgb: (cvt(h + 1.0 / 3.0), cvt(h), cvt(h - 1.0 / 3.0)),
alpha: 1.0,
}
}
}
|
