use super::{Image, ImageTryCreate}; use num_integer::Integer; #[allow(dead_code)] pub struct Checkerboard; impl Checkerboard { #[allow(dead_code)] pub fn checkerboard(width: u8, height: u8, color0: u8, color1: u8) -> Image { if width == 0 || height == 0 { return Image::empty(); } let mut pixels = Vec::::new(); for y in 0..(height as u16) { for x in 0..(width as u16) { let color = if (x + y).is_even() { color0 } else { color1 }; pixels.push(color); } } assert_eq!(pixels.len(), (width as usize) * (height as usize)); Image::try_create(width, height, pixels).expect("image") } } #[cfg(test)] mod tests { use super::*; #[test] fn test_10000_checkerboard() { // Act let actual: Image = Checkerboard::checkerboard(5, 4, 0, 1); // Assert let expected_pixels: Vec = vec![ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, ]; let expected: Image = Image::try_create(5, 4, expected_pixels).expect("image"); assert_eq!(actual, expected); } }