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use std::{
iter::{StepBy, Take},
ops::{Bound, Index, IndexMut, RangeBounds},
slice::{ChunksMut, Iter, IterMut},
};
use glam::{IVec2, Vec2};
use itertools::Itertools;
use crate::point::{Pivot, Point2d, Size2d};
#[derive(Default, Debug, Clone)]
pub struct Grid<T: Clone> {
data: Vec<T>,
size: IVec2,
}
impl<T: Clone> Grid<T> {
pub fn new(value: T, size: impl Size2d) -> Self {
let size = size.xy();
let len = (size.x * size.y) as usize;
Self {
data: vec![value; len],
size,
}
}
pub fn default(size: impl Size2d) -> Self
where
T: Default,
{
Grid::new(T::default(), size)
}
#[inline]
pub fn iter(&self) -> Iter<T> {
self.data.iter()
}
#[inline]
pub fn iter_mut(&mut self) -> IterMut<T> {
self.data.iter_mut()
}
#[inline]
pub fn row_iter(&self, y: usize) -> Iter<T> {
let w = self.width() as usize;
let i = y * w;
self.data[i..i + w].iter()
}
#[inline]
pub fn row_iter_mut(&mut self, y: usize) -> impl Iterator<Item = &mut T> {
let w = self.width() as usize;
let i = y * w;
self.data[i..i + w].iter_mut()
}
pub fn insert_row(&mut self, y: usize, row: impl Iterator<Item = T>) {
self.insert_row_at([0, y as i32], row);
}
pub fn insert_row_at(&mut self, xy: impl Point2d, row: impl Iterator<Item = T>) {
let [x, y] = xy.to_array();
let iter = self.row_iter_mut(y as usize).skip(x as usize);
for (v, input) in iter.zip(row) {
*v = input;
}
}
pub fn insert_column(&mut self, x: usize, column: impl IntoIterator<Item = T>) {
self.insert_column_at([x as i32, 0], column);
}
pub fn insert_column_at(&mut self, xy: impl Point2d, column: impl IntoIterator<Item = T>) {
let [x, y] = xy.to_array();
let iter = self.column_iter_mut(x as usize).skip(y as usize);
for (v, input) in iter.zip(column) {
*v = input;
}
}
#[inline]
pub fn column_iter(&self, x: usize) -> StepBy<Iter<T>> {
let w = self.width() as usize;
return self.data[x..].iter().step_by(w);
}
#[inline]
pub fn column_iter_mut(&mut self, x: usize) -> StepBy<IterMut<T>> {
let w = self.width() as usize;
return self.data[x..].iter_mut().step_by(w);
}
pub fn width(&self) -> usize {
self.size.x as usize
}
pub fn height(&self) -> usize {
self.size.y as usize
}
pub fn size(&self) -> IVec2 {
self.size
}
#[allow(clippy::len_without_is_empty)]
pub fn len(&self) -> usize {
self.data.len()
}
#[inline(always)]
pub fn pos_to_index(&self, pos: impl Point2d) -> usize {
let [x, y] = pos.to_array();
y as usize * self.width() + x as usize
}
#[inline(always)]
pub fn index_to_pos(&self, index: usize) -> IVec2 {
let index = index as i32;
let w = self.width() as i32;
let x = index % w;
let y = index / w;
IVec2::new(x, y)
}
pub fn pivot_position(&self, pivot: Pivot) -> IVec2 {
let size = self.size().as_vec2() - Vec2::ONE;
let pivot = Vec2::from(pivot);
(size * pivot).floor().as_ivec2()
}
#[inline]
pub fn in_bounds(&self, pos: IVec2) -> bool {
pos.cmpge(IVec2::ZERO).all() && pos.cmplt(self.size()).all()
}
pub fn side_index(&self, side: Side) -> usize {
match side {
Side::Left => 0,
Side::Top => self.height() - 1,
Side::Right => self.width() - 1,
Side::Bottom => 0,
}
}
pub fn rect_iter<RANGE: RangeBounds<[i32; 2]>>(
&self,
range: RANGE,
) -> impl Iterator<Item = (IVec2, &T)> {
let (min, max) = ranges_to_min_max(range, self.size());
(min.y..=max.y)
.cartesian_product(min.x..=max.x)
.map(|(y, x)| ((IVec2::new(x, y)), &self[[x, y]]))
}
pub fn iter_2d(&self) -> impl Iterator<Item = (IVec2, &T)> {
(0..self.height())
.cartesian_product(0..self.width())
.map(|(y, x)| IVec2::new(x as i32, y as i32))
.zip(self.data.iter())
}
pub fn iter_2d_mut(&mut self) -> impl Iterator<Item = (IVec2, &mut T)> {
(0..self.height())
.cartesian_product(0..self.width())
.map(|(y, x)| IVec2::new(x as i32, y as i32))
.zip(self.data.iter_mut())
}
pub fn slice<R: RangeBounds<usize>>(&self, slice: R) -> &[T] {
let (min, max) = ranges_to_min_max_usize(slice, self.len());
&self.data[min..max]
}
pub fn slice_mut<R: RangeBounds<usize>>(&mut self, slice: R) -> &mut [T] {
let (min, max) = ranges_to_min_max_usize(slice, self.len());
&mut self.data[min..max]
}
pub fn rows_iter(&self, range: impl RangeBounds<usize>) -> impl Iterator<Item = &[T]> {
let [start, end] = self.range_to_start_end(range, 1);
let width = self.width() as usize;
let x = start * width;
let count = end.saturating_sub(start) + 1;
let chunks = self.data[x..].chunks(width);
chunks.take(count)
}
pub fn rows_iter_mut(&mut self, range: impl RangeBounds<usize>) -> Take<ChunksMut<T>> {
let [start, end] = self.range_to_start_end(range, 1);
let width = self.width() as usize;
let x = start * width;
let count = end - start + 1;
let chunks = self.data[x..].chunks_mut(width);
chunks.take(count)
}
pub fn axis_index(&self, axis: usize) -> usize {
match axis {
0 => self.side_index(Side::Right),
1 => self.side_index(Side::Top),
_ => panic!("Invalid grid axis {}", axis),
}
}
pub fn axis_size(&self, axis: usize) -> usize {
match axis {
0 => self.width() as usize,
1 => self.height() as usize,
_ => panic!("Invalid grid axis {}", axis),
}
}
fn range_to_start_end(&self, range: impl RangeBounds<usize>, axis: usize) -> [usize; 2] {
let start = match range.start_bound() {
Bound::Included(start) => *start,
Bound::Excluded(start) => *start,
Bound::Unbounded => 0,
};
let end = match range.end_bound() {
Bound::Included(end) => *end,
Bound::Excluded(end) => *end - 1,
Bound::Unbounded => self.axis_size(axis),
};
[start, end]
}
}
fn ranges_to_min_max_usize<RANGE: RangeBounds<usize>>(range: RANGE, max: usize) -> (usize, usize) {
let range_min = match range.start_bound() {
std::ops::Bound::Included(v) => *v,
std::ops::Bound::Excluded(v) => *v,
std::ops::Bound::Unbounded => 0,
};
let range_max = match range.end_bound() {
std::ops::Bound::Included(v) => *v,
std::ops::Bound::Excluded(v) => v.saturating_sub(1),
std::ops::Bound::Unbounded => max,
};
debug_assert!(range_min < range_max);
debug_assert!(range_max <= max);
(range_min, range_max)
}
fn ranges_to_min_max<RANGE: RangeBounds<[i32; 2]>>(range: RANGE, max: IVec2) -> (IVec2, IVec2) {
let min = match range.start_bound() {
std::ops::Bound::Included([x, y]) => IVec2::new(*x, *y),
std::ops::Bound::Excluded([x, y]) => IVec2::new(*x, *y),
std::ops::Bound::Unbounded => IVec2::ZERO,
};
let max = match range.end_bound() {
std::ops::Bound::Included([x, y]) => IVec2::new(*x, *y),
std::ops::Bound::Excluded([x, y]) => IVec2::new(x - 1, y - 1),
std::ops::Bound::Unbounded => max,
};
debug_assert!(min.cmpge(IVec2::ZERO).all() && min.cmplt(max).all());
debug_assert!(max.cmple(max).all());
(min, max)
}
impl<T: Clone, P: Point2d> Index<P> for Grid<T> {
type Output = T;
fn index(&self, p: P) -> &Self::Output {
let i = self.pos_to_index(p);
&self.data[i]
}
}
impl<T: Clone, P: Point2d> IndexMut<P> for Grid<T>
where
T: Default,
{
fn index_mut(&mut self, index: P) -> &mut T {
let xy = index.xy();
let i = self.pos_to_index(xy);
&mut self.data[i]
}
}
impl<T: Clone> Index<usize> for Grid<T> {
type Output = T;
fn index(&self, i: usize) -> &Self::Output {
&self.data[i]
}
}
impl<T: Clone> IndexMut<usize> for Grid<T>
where
T: Default,
{
fn index_mut(&mut self, index: usize) -> &mut T {
&mut self.data[index]
}
}
pub enum Side {
Left,
Top,
Right,
Bottom,
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn range_convert() {
let grid = Grid::new(0, [5, 11]);
let [start, end] = grid.range_to_start_end(.., 0);
assert_eq!([start, end], [0, 5]);
let [start, count] = grid.range_to_start_end(5..=10, 0);
assert_eq!([start, count], [5, 10]);
let [start, count] = grid.range_to_start_end(3..11, 0);
assert_eq!([start, count], [3, 10]);
}
#[test]
fn rows_iter() {
let mut grid = Grid::default([3, 10]);
grid.insert_row(3, std::iter::repeat(5));
grid.insert_row(4, std::iter::repeat(6));
let mut iter = grid.rows_iter(3..=4);
assert!(iter.next().unwrap().iter().all(|v| *v == 5));
assert!(iter.next().unwrap().iter().all(|v| *v == 6));
}
#[test]
fn rows_iter_mut() {
let mut grid = Grid::default([3, 4]);
for row in grid.rows_iter_mut(..) {
row.iter_mut().for_each(|v| *v = 5);
}
assert!(grid.iter().all(|v| *v == 5));
}
#[test]
fn row_iter() {
let mut grid = Grid::default([10, 15]);
let chars = "hello".chars();
for (elem, ch) in grid.row_iter_mut(3).take(5).zip(chars) {
*elem = ch;
}
let hello = grid.row_iter(3).take(5).collect::<String>();
assert_eq!("hello", hello);
assert_eq!(grid.row_iter(6).len(), 10);
}
#[test]
fn column_iter() {
let mut grid = Grid::default([10, 15]);
let chars = ['h', 'e', 'l', 'l', 'o'];
for (elem, ch) in grid.column_iter_mut(5).take(5).zip(chars) {
*elem = ch;
}
let hello = grid.column_iter(5).take(5).collect::<String>();
assert_eq!("hello", hello);
assert_eq!(grid.column_iter(2).len(), 15);
}
#[test]
fn iter_2d() {
let mut grid = Grid::new(0, [5, 3]);
grid[[0, 0]] = 5;
grid[[3, 1]] = 10;
grid[[4, 2]] = 20;
let vec: Vec<_> = grid.iter_2d().collect();
assert_eq!(vec.len(), 5 * 3);
assert_eq!(*vec[grid.pos_to_index([0, 0])].1, 5);
assert_eq!(*vec[grid.pos_to_index([3, 1])].1, 10);
assert_eq!(*vec[grid.pos_to_index([4, 2])].1, 20);
let mut iter = grid.iter_2d();
let (p, _) = iter.next().unwrap();
assert_eq!(0, p.x);
assert_eq!(0, p.y);
let (p, _) = iter.next().unwrap();
assert_eq!(1, p.x);
assert_eq!(0, p.y);
let (p, _) = iter.nth(3).unwrap();
assert_eq!(0, p.x);
assert_eq!(1, p.y);
}
#[test]
fn iter() {
let grid = Grid::new(5, [10, 10]);
let v: Vec<_> = grid.iter().collect();
assert_eq!(v.len(), 100);
assert_eq!(*v[0], 5);
assert_eq!(*v[99], 5);
}
#[test]
fn iter_mut() {
let mut grid = Grid::new(5, [10, 10]);
for i in grid.iter_mut() {
*i = 10;
}
assert_eq!(grid[0], 10);
}
#[test]
fn positions() {
let grid = Grid::new(0, [4, 4]);
assert_eq!(grid.pivot_position(Pivot::TopLeft), IVec2::new(0, 3));
assert_eq!(grid.pivot_position(Pivot::TopRight), IVec2::new(3, 3));
assert_eq!(grid.pivot_position(Pivot::BottomRight), IVec2::new(3, 0));
assert_eq!(grid.pivot_position(Pivot::BottomLeft), IVec2::new(0, 0));
assert_eq!(grid.pivot_position(Pivot::Center), IVec2::new(1, 1));
let grid = Grid::new(0, [5, 5]);
assert_eq!(grid.pivot_position(Pivot::TopLeft), IVec2::new(0, 4));
assert_eq!(grid.pivot_position(Pivot::TopRight), IVec2::new(4, 4));
assert_eq!(grid.pivot_position(Pivot::BottomRight), IVec2::new(4, 0));
assert_eq!(grid.pivot_position(Pivot::BottomLeft), IVec2::new(0, 0));
assert_eq!(grid.pivot_position(Pivot::Center), IVec2::new(2, 2));
}
#[test]
fn rect_iter() {
let mut grid = Grid::new(0, [11, 15]);
grid[[2, 2]] = 5_i32;
grid[[4, 4]] = 10;
let iter = grid.rect_iter([2, 2]..=[4, 4]);
let vec: Vec<_> = iter.collect();
assert_eq!(vec.len(), 9);
assert_eq!(*vec[0].1, 5);
assert_eq!(*vec[8].1, 10);
let mut iter = grid.rect_iter([2, 2]..=[4, 4]);
let (p, _) = iter.next().unwrap();
assert_eq!(p, IVec2::new(2, 2));
assert_eq!(iter.nth(7).unwrap().0, IVec2::new(4, 4));
}
#[test]
fn column_insert() {
let mut grid = Grid::default([10, 10]);
grid.insert_column(3, "Hello".chars());
let hello: String = grid.column_iter(3).take(5).collect();
assert_eq!(hello, "Hello");
}
#[test]
fn row_insert() {
let mut grid = Grid::default([10, 10]);
grid.insert_row(3, "Hello".chars());
let hello: String = grid.row_iter(3).take(5).collect();
assert_eq!(hello, "Hello");
}
}