colormap 0.0.2

Color gradient and color interpolation
Documentation 
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use crate::interpolation::Interpolator;
use color_core::{HSVA32, RGBA32, RGBA8};
use image::GenericImageView;
use std::{collections::BTreeMap, ops::Range};
mod builtin;

#[derive(Clone, Debug)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct HsvGradient {
    hue: Interpolator,
    saturation: Interpolator,
    brightness: Interpolator,
    alpha: Interpolator,
    range: Range<f32>,
}

impl HsvGradient {
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn new(min: f32, max: f32) -> Self {
        debug_assert!(max > min, "max must be greater than min");
        Self {
            hue: Interpolator::new(0.0, 360.0),
            saturation: Interpolator::new(100.0, 100.0),
            brightness: Interpolator::new(100.0, 100.0),
            alpha: Interpolator::new(100.0, 100.0),
            range: Range { start: min, end: max },
        }
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn rescale(&mut self, min: f32, max: f32) {
        debug_assert!(max > min, "max must be greater than min");
        self.range = Range { start: min, end: max };
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn insert_color<HSV>(&mut self, key: f32, color: HSV)
    where
        HSV: Into<HSVA32>,
    {
        let hsva = color.into();
        let ratio = self.get_ratio(key);
        self.hue.insert(ratio, hsva.h);
        self.saturation.insert(ratio, hsva.s);
        self.brightness.insert(ratio, hsva.v);
        self.alpha.insert(ratio, hsva.a);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn remove_color(&mut self, key: f32) {
        let ratio = self.get_ratio(key);
        self.hue.remove(ratio);
        self.saturation.remove(ratio);
        self.brightness.remove(ratio);
        self.alpha.remove(ratio);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn insert_hue(&mut self, key: f32, value: f32) {
        let ratio = self.get_ratio(key);
        self.hue.insert(ratio, value);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn remove_hue(&mut self, key: f32) {
        let ratio = self.get_ratio(key);
        self.hue.remove(ratio);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn insert_saturation(&mut self, key: f32, value: f32) {
        let ratio = self.get_ratio(key);
        self.saturation.insert(ratio, value);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn remove_saturation(&mut self, key: f32) {
        let ratio = self.get_ratio(key);
        self.saturation.remove(ratio);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn insert_brightness(&mut self, key: f32, value: f32) {
        let ratio = self.get_ratio(key);
        self.brightness.insert(ratio, value);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn remove_brightness(&mut self, key: f32) {
        let ratio = self.get_ratio(key);
        self.brightness.remove(ratio);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn insert_alpha(&mut self, key: f32, value: f32) {
        let ratio = self.get_ratio(key);
        self.alpha.insert(ratio, value);
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn remove_alpha(&mut self, key: f32) {
        let ratio = self.get_ratio(key);
        self.alpha.remove(ratio);
    }
    pub fn clear_alpha(&mut self) {
        self.alpha.clear();
    }
}

impl HsvGradient {
    fn get_ratio(&self, value: f32) -> u16 {
        if value <= self.range.start {
            0
        }
        else if value >= self.range.end {
            65535
        }
        else {
            let ratio = (value - self.range.start) / (self.range.end - self.range.start);
            (ratio * 65535.0) as u16
        }
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn get_step(&self, value: f32) -> HSVA32 {
        let ratio = self.get_ratio(value);
        HSVA32 {
            h: self.hue.get_step(ratio),
            s: self.saturation.get_step(ratio),
            v: self.brightness.get_step(ratio),
            a: self.alpha.get_step(ratio),
        }
    }
    /// Creates a new HSVGradient with the given min and max values.
    ///
    /// # Arguments
    ///
    /// * `min`:
    /// * `max`:
    ///
    /// returns: HSVGradient
    ///
    /// # Examples
    ///
    /// ```
    /// # use color_gradient;
    /// ```
    pub fn get_linear(&self, value: f32) -> HSVA32 {
        let ratio = self.get_ratio(value);
        HSVA32 {
            h: self.hue.get_linear(ratio),
            s: self.saturation.get_linear(ratio),
            v: self.brightness.get_linear(ratio),
            a: self.alpha.get_linear(ratio),
        }
    }
}