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use super::{Image, ImageHistogram, Histogram, ImageSkew, ImageSize, ImageSymmetry};
#[allow(dead_code)]
pub struct DiagonalHistogram {
reverse_x: bool,
image_size: ImageSize,
histogram_vec: Vec<Histogram>,
}
impl DiagonalHistogram {
/// The `diagonal A` is going from `top-left` to `bottom-right`
#[allow(dead_code)]
pub fn diagonal_a(image: &Image) -> anyhow::Result<DiagonalHistogram> {
let flipped: Image = image.flip_x()?;
Self::create(&flipped, true, image.size())
}
/// The `diagonal B` is going from `top-right` to `bottom-left`
#[allow(dead_code)]
pub fn diagonal_b(image: &Image) -> anyhow::Result<DiagonalHistogram> {
Self::create(image, false, image.size())
}
fn create(image: &Image, reverse_x: bool, image_size: ImageSize) -> anyhow::Result<DiagonalHistogram> {
if image.is_empty() {
return Ok(DiagonalHistogram {
reverse_x,
image_size,
histogram_vec: vec!(),
});
}
let magic_color: u8 = 255;
let image_skewed: Image = image.skew_x(magic_color, false)?;
let mut histogram_vec: Vec<Histogram> = image_skewed.histogram_columns();
for histogram in histogram_vec.iter_mut() {
histogram.set_counter_to_zero(magic_color);
}
Ok(DiagonalHistogram {
reverse_x,
image_size,
histogram_vec
})
}
#[allow(dead_code)]
pub fn max_number_of_unique_colors(&self) -> u16 {
let mut found_value: u16 = 0;
for histogram in &self.histogram_vec {
let count: u16 = histogram.number_of_counters_greater_than_zero();
if count > found_value {
found_value = count;
}
}
found_value
}
#[allow(dead_code)]
pub fn min_number_of_unique_colors(&self) -> u16 {
let mut found_value: u16 = u16::MAX;
for histogram in &self.histogram_vec {
let count: u16 = histogram.number_of_counters_greater_than_zero();
if found_value > count {
found_value = count;
}
}
found_value
}
#[allow(dead_code)]
pub fn get(&self, x: i32, y: i32) -> Option<&Histogram> {
let x: i32 = if self.reverse_x {
(self.image_size.width as i32) - 1 - x
} else {
x
};
if x < 0 || y < 0 {
return None;
}
if x >= (self.image_size.width as i32) || y >= (self.image_size.height as i32) {
return None;
}
let column_index: usize = (x as usize) + (y as usize);
self.histogram_vec.get(column_index)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::arc::ImageTryCreate;
#[test]
fn test_10000_diagonal_a() {
// Arrange
let pixels: Vec<u8> = vec![
1, 0, 0, 0,
0, 1, 0, 0,
2, 0, 1, 0,
0, 9, 0, 1,
0, 0, 2, 0,
3, 0, 0, 2,
];
let input: Image = Image::try_create(4, 6, pixels).expect("image");
// Act
let dh: DiagonalHistogram = DiagonalHistogram::diagonal_a(&input).expect("ok");
// Assert
{
let histogram: &Histogram = dh.get(0, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(1), 4);
}
{
let histogram: &Histogram = dh.get(3, 3).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(1), 4);
}
{
let histogram: &Histogram = dh.get(1, 3).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 2);
assert_eq!(histogram.get(2), 3);
assert_eq!(histogram.get(9), 1);
}
{
let histogram: &Histogram = dh.get(0, 5).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(3), 1);
}
}
#[test]
fn test_10001_diagonal_a() {
// Arrange
let pixels: Vec<u8> = vec![
1, 0, 3, 0, 0, 8,
0, 1, 0, 3, 0, 0,
0, 0, 1, 0, 7, 0,
9, 0, 0, 1, 0, 3,
];
let input: Image = Image::try_create(6, 4, pixels).expect("image");
// Act
let dh: DiagonalHistogram = DiagonalHistogram::diagonal_a(&input).expect("ok");
// Assert
{
let histogram: &Histogram = dh.get(0, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(1), 4);
}
{
let histogram: &Histogram = dh.get(2, 2).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(1), 4);
}
{
let histogram: &Histogram = dh.get(2, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 2);
assert_eq!(histogram.get(3), 3);
assert_eq!(histogram.get(7), 1);
}
{
let histogram: &Histogram = dh.get(4, 2).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 2);
assert_eq!(histogram.get(3), 3);
assert_eq!(histogram.get(7), 1);
}
{
let histogram: &Histogram = dh.get(5, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(8), 1);
}
}
#[test]
fn test_20000_diagonal_b() {
// Arrange
let pixels: Vec<u8> = vec![
0, 0, 0, 1,
0, 0, 1, 0,
0, 1, 0, 2,
1, 0, 9, 0,
0, 2, 0, 0,
2, 0, 0, 3,
];
let input: Image = Image::try_create(4, 6, pixels).expect("image");
// Act
let dh: DiagonalHistogram = DiagonalHistogram::diagonal_b(&input).expect("ok");
// Assert
{
let histogram: &Histogram = dh.get(3, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(1), 4);
}
{
let histogram: &Histogram = dh.get(1, 2).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(1), 4);
}
{
let histogram: &Histogram = dh.get(2, 3).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 2);
assert_eq!(histogram.get(2), 3);
assert_eq!(histogram.get(9), 1);
}
{
let histogram: &Histogram = dh.get(3, 5).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(3), 1);
}
}
#[test]
fn test_20001_diagonal_b() {
// Arrange
let pixels: Vec<u8> = vec![
8, 0, 0, 1, 0, 9,
0, 0, 1, 0, 9, 0,
0, 1, 0, 2, 0, 0,
1, 0, 9, 0, 0, 5,
];
let input: Image = Image::try_create(6, 4, pixels).expect("image");
// Act
let dh: DiagonalHistogram = DiagonalHistogram::diagonal_b(&input).expect("ok");
// Assert
{
let histogram: &Histogram = dh.get(0, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(8), 1);
}
{
let histogram: &Histogram = dh.get(3, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(1), 4);
}
{
let histogram: &Histogram = dh.get(5, 0).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 2);
assert_eq!(histogram.get(2), 1);
assert_eq!(histogram.get(9), 3);
}
{
let histogram: &Histogram = dh.get(5, 3).expect("some");
assert_eq!(histogram.number_of_counters_greater_than_zero(), 1);
assert_eq!(histogram.get(5), 1);
}
}
}
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