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use crate::{geometry::Point, pixelcolor::PixelColor, Pixel};
#[derive(Debug, PartialEq)]
pub struct Translated<I> {
iter: I,
offset: Point,
}
impl<I, C> Translated<I>
where
I: Iterator<Item = Pixel<C>>,
C: PixelColor,
{
pub(super) fn new(iter: I, offset: Point) -> Self {
Self { iter, offset }
}
}
impl<I, C> Iterator for Translated<I>
where
I: Iterator<Item = Pixel<C>>,
C: PixelColor,
{
type Item = I::Item;
fn next(&mut self) -> Option<Self::Item> {
self.iter
.next()
.map(|Pixel(p, c)| Pixel(p + self.offset, c))
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{iterator::PixelIteratorExt, pixelcolor::BinaryColor};
#[test]
fn translate() {
let pixels = [
Pixel(Point::new(1, 2), BinaryColor::On),
Pixel(Point::new(3, 4), BinaryColor::On),
Pixel(Point::new(5, 6), BinaryColor::On),
];
let pixels = pixels.iter().copied();
let expected = [
Pixel(Point::new(1 + 4, 2 + 5), BinaryColor::On),
Pixel(Point::new(3 + 4, 4 + 5), BinaryColor::On),
Pixel(Point::new(5 + 4, 6 + 5), BinaryColor::On),
];
let expected = expected.iter().copied();
assert!(pixels.translated(Point::new(4, 5)).eq(expected));
}
}