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use crate::prelude::{HSV, RGB, RGBA};
use core::iter::{ExactSizeIterator, Iterator};
use std::convert::TryInto;
pub struct RgbLerp {
start: RGB,
end: RGB,
n_steps: usize,
step: usize,
}
impl RgbLerp {
#[inline]
pub fn new<T>(start: RGB, end: RGB, steps: T) -> Self
where
T: TryInto<usize>,
{
Self {
start,
end,
n_steps: steps
.try_into()
.ok()
.expect("Not a usize-convertible integer"),
step: 0,
}
}
}
impl Iterator for RgbLerp {
type Item = RGB;
#[inline]
#[allow(clippy::cast_precision_loss)]
fn next(&mut self) -> Option<RGB> {
if self.step > self.n_steps {
None
} else {
let percent = self.step as f32 / self.n_steps as f32;
self.step += 1;
Some(self.start.lerp(self.end, percent))
}
}
}
impl ExactSizeIterator for RgbLerp {
#[inline]
#[must_use]
fn len(&self) -> usize {
self.n_steps
}
}
pub struct HsvLerp {
start: HSV,
end: HSV,
n_steps: usize,
step: usize,
}
impl HsvLerp {
#[inline]
pub fn new<T>(start: HSV, end: HSV, steps: T) -> Self
where
T: TryInto<usize>,
{
Self {
start,
end,
n_steps: steps.try_into().ok().expect("Not an integer"),
step: 0,
}
}
}
impl Iterator for HsvLerp {
type Item = HSV;
#[inline]
#[allow(clippy::cast_precision_loss)]
fn next(&mut self) -> Option<HSV> {
if self.step > self.n_steps {
None
} else {
let percent = self.step as f32 / self.n_steps as f32;
self.step += 1;
Some(self.start.lerp(self.end, percent))
}
}
}
impl ExactSizeIterator for HsvLerp {
#[inline]
#[must_use]
fn len(&self) -> usize {
self.n_steps
}
}
pub struct RgbaLerp {
start: RGBA,
end: RGBA,
n_steps: usize,
step: usize,
}
impl RgbaLerp {
#[inline]
pub fn new<T>(start: RGBA, end: RGBA, steps: T) -> Self
where
T: TryInto<usize>,
{
Self {
start,
end,
n_steps: steps
.try_into()
.ok()
.expect("Not a usize-convertible integer"),
step: 0,
}
}
}
impl Iterator for RgbaLerp {
type Item = RGBA;
#[inline]
#[allow(clippy::cast_precision_loss)]
fn next(&mut self) -> Option<RGBA> {
if self.step > self.n_steps {
None
} else {
let percent = self.step as f32 / self.n_steps as f32;
self.step += 1;
Some(self.start.lerp(self.end, percent))
}
}
}
pub struct AlphaLerp {
start: RGBA,
end: RGBA,
n_steps: usize,
step: usize,
}
impl AlphaLerp {
#[inline]
pub fn new<T>(start: RGBA, end: RGBA, steps: T) -> Self
where
T: TryInto<usize>,
{
Self {
start,
end,
n_steps: steps
.try_into()
.ok()
.expect("Not a usize-convertible integer"),
step: 0,
}
}
}
impl Iterator for AlphaLerp {
type Item = RGBA;
#[inline]
#[allow(clippy::cast_precision_loss)]
fn next(&mut self) -> Option<RGBA> {
if self.step > self.n_steps {
None
} else {
let percent = self.step as f32 / self.n_steps as f32;
self.step += 1;
Some(self.start.lerp_alpha(self.end, percent))
}
}
}