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use super::{Image, ImagePadding, ImageExtractRowColumn, ImageStack, ImageRepeat};
pub trait ImageBorder {
/// Draw border inside an empty image.
///
/// Similar to CSS `border` with `box-sizing: border-box`.
fn border_inside(width: u8, height: u8, fill_color: u8, border_color: u8, border_size: u8) -> anyhow::Result<Image>;
/// Expand by repeating the outer-most pixel border.
fn border_grow(&self, border_size: u8, corner_color: u8) -> anyhow::Result<Image>;
}
impl ImageBorder for Image {
fn border_inside(width: u8, height: u8, fill_color: u8, border_color: u8, border_size: u8) -> anyhow::Result<Image> {
if width == 0 || height == 0 {
return Ok(Image::empty());
}
let inner_width_i32: i32 = (width as i32) - (2 * (border_size as i32));
let inner_height_i32: i32 = (height as i32) - (2 * (border_size as i32));
if inner_width_i32 <= 0 || inner_height_i32 <= 0 {
return Ok(Image::color(width, height, border_color));
}
let inner_width: u8 = inner_width_i32 as u8;
let inner_height: u8 = inner_height_i32 as u8;
let mut image: Image = Image::color(inner_width, inner_height, fill_color);
if border_size > 0 {
image = image.padding_with_color(border_size, border_color)?;
}
Ok(image)
}
fn border_grow(&self, border_size: u8, corner_color: u8) -> anyhow::Result<Image> {
if border_size == 0 {
return Err(anyhow::anyhow!("border_size must be 1 or greater"));
}
let corner: Image = Image::color(border_size, border_size, corner_color);
if self.is_empty() {
let result_image: Image = corner.repeat_by_count(2, 2)?;
return Ok(result_image);
}
let top: Image = self.top_rows(1)?.repeat_by_count(1, border_size)?;
let left: Image = self.left_columns(1)?.repeat_by_count(border_size, 1)?;
let right: Image = self.right_columns(1)?.repeat_by_count(border_size, 1)?;
let bottom: Image = self.bottom_rows(1)?.repeat_by_count(1, border_size)?;
// Glue together the 9x9 pieces into a single piece
let a: Image = corner.vjoin(left)?.vjoin(corner.clone())?;
let b: Image = top.vjoin(self.clone())?.vjoin(bottom)?;
let c: Image = corner.vjoin(right)?.vjoin(corner.clone())?;
let result_image: Image = a.hjoin(b)?.hjoin(c)?;
Ok(result_image)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::arc::ImageTryCreate;
#[test]
fn test_10000_border_inside() {
// Act
let actual: Image = Image::border_inside(6, 5, 1, 9, 3).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
];
let expected: Image = Image::try_create(6, 5, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_10001_border_inside() {
// Act
let actual: Image = Image::border_inside(6, 5, 1, 9, 2).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
9, 9, 1, 1, 9, 9,
9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
];
let expected: Image = Image::try_create(6, 5, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_10002_border_inside() {
// Act
let actual: Image = Image::border_inside(6, 5, 1, 9, 1).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
9, 9, 9, 9, 9, 9,
9, 1, 1, 1, 1, 9,
9, 1, 1, 1, 1, 9,
9, 1, 1, 1, 1, 9,
9, 9, 9, 9, 9, 9,
];
let expected: Image = Image::try_create(6, 5, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_10003_border_inside() {
// Act
let actual: Image = Image::border_inside(6, 5, 1, 9, 0).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1,
];
let expected: Image = Image::try_create(6, 5, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_20000_border_grow_3x2() {
// Arrange
let pixels: Vec<u8> = vec![
1, 2, 3,
4, 5, 6,
];
let input: Image = Image::try_create(3, 2, pixels).expect("image");
// Act
let actual: Image = input.border_grow(1, 9).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
9, 1, 2, 3, 9,
1, 1, 2, 3, 3,
4, 4, 5, 6, 6,
9, 4, 5, 6, 9,
];
let expected: Image = Image::try_create(5, 4, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_20001_border_grow_1x1() {
// Arrange
let input: Image = Image::color(1, 1, 2);
// Act
let actual: Image = input.border_grow(2, 9).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
9, 9, 2, 9, 9,
9, 9, 2, 9, 9,
2, 2, 2, 2, 2,
9, 9, 2, 9, 9,
9, 9, 2, 9, 9,
];
let expected: Image = Image::try_create(5, 5, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
#[test]
fn test_20002_border_grow_empty() {
// Act
let actual: Image = Image::empty().border_grow(2, 1).expect("image");
// Assert
let expected_pixels: Vec<u8> = vec![
1, 1, 1, 1,
1, 1, 1, 1,
1, 1, 1, 1,
1, 1, 1, 1,
];
let expected: Image = Image::try_create(4, 4, expected_pixels).expect("image");
assert_eq!(actual, expected);
}
}
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