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use super::{Image, ImageRotate90, ImageSize, ImageRepeat};
#[allow(dead_code)]
pub enum GeneratePattern {
/// Draw alternating columns with two colors.
///
/// The left-most-column is always color0.
StripedColumns { count0: u8, color0: u8, count1: u8, color1: u8 },
/// Draw alternating rows with two colors.
///
/// The left-most-row is always color0.
StripedRows { count0: u8, color0: u8, count1: u8, color1: u8 },
}
impl GeneratePattern {
/// Draws the pattern.
///
/// Returns an image with the given size.
#[allow(dead_code)]
pub fn draw(&self, size: ImageSize) -> anyhow::Result<Image> {
match self {
GeneratePattern::StripedColumns { count0, color0, count1, color1 } => {
let image: Image = Self::striped_columns(*count0, *color0, *count1, *color1, size)?;
return Ok(image);
},
GeneratePattern::StripedRows { count0, color0, count1, color1 } => {
let size_rotated = size.rotate();
let image_rotated: Image = Self::striped_columns(*count0, *color0, *count1, *color1, size_rotated)?;
let image: Image = image_rotated.rotate_cw()?;
return Ok(image);
},
}
}
/// Draw alternating columns with two colors.
///
/// Returns an image with the given size.
fn striped_columns(count0: u8, color0: u8, count1: u8, color1: u8, size: ImageSize) -> anyhow::Result<Image> {
if count0 == 0 || count1 == 0 {
return Err(anyhow::anyhow!("count0 and count1 must be non-zero"));
}
if size.is_empty() {
return Err(anyhow::anyhow!("size must be non-empty"));
}
let count_sum: u16 = count0 as u16 + count1 as u16;
let mut result_image = Image::zero(size.width, 1);
for x in 0..size.width as u16 {
let color = if x % count_sum < (count0 as u16) { color0 } else { color1 };
result_image.set(x as i32, 0, color);
}
result_image = result_image.repeat_by_count(1, size.height)?;
Ok(result_image)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::arc::ImageTryCreate;
#[test]
fn test_10000_striped_columns() {
// Arrange
let pattern = GeneratePattern::StripedColumns { count0: 1, color0: 5, count1: 1, color1: 3 };
// Act
let actual: Image = pattern.draw(ImageSize::new(5, 2)).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
5, 3, 5, 3, 5,
5, 3, 5, 3, 5,
];
let expected: Image = Image::try_create(5, 2, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_10001_striped_columns() {
// Arrange
let pattern = GeneratePattern::StripedColumns { count0: 2, color0: 5, count1: 1, color1: 3 };
// Act
let actual: Image = pattern.draw(ImageSize::new(7, 2)).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
5, 5, 3, 5, 5, 3, 5,
5, 5, 3, 5, 5, 3, 5,
];
let expected: Image = Image::try_create(7, 2, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_20000_striped_rows() {
// Arrange
let pattern = GeneratePattern::StripedRows { count0: 2, color0: 0, count1: 3, color1: 1 };
// Act
let actual: Image = pattern.draw(ImageSize::new(2, 8)).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
0, 0,
0, 0,
1, 1,
1, 1,
1, 1,
0, 0,
0, 0,
1, 1,
];
let expected: Image = Image::try_create(2, 8, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
}
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