nd_vector 0.1.0

[WIP] Lengthen! Shrink! Iterate! Scale! Twist and turn to your imagination along any dimension on a vector!
Documentation 
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use std::ops::Range;


use crate::usage_types::coordinates::Coordinate;

use crate::VectorGrid;

pub struct IterVectorGridChunk<'a, ItemType> {
    source: &'a VectorGrid<ItemType>,
    ended: bool,
    // Todo: Location can be a single index number.
    location: Coordinate,
    shape: Vec<Range<usize>>
}

impl<ItemType> IterVectorGridChunk<'_, ItemType> {
    fn increment_position(&mut self, i: usize) {
        if i >= self.shape.len() {
            self.ended = true;
            return;
        }
        *self.location.index_mut(i) += 1;
        if *self.location.index_mut(i) >= self.shape[i].end as isize {
            *self.location.index_mut(i) = self.shape[i].start as isize;
            self.increment_position(i + 1);
        }
    }
}

impl<'a, ItemType> Iterator for IterVectorGridChunk<'a, ItemType> {
    type Item =  &'a ItemType;
    
    fn next(&mut self) -> Option<Self::Item> {
        if self.ended {
            return None;
        }
        let result = Some(&self.source[&self.location]);
        self.increment_position(0);
        result
    }
}

impl<ItemType> VectorGrid<ItemType> {

    pub fn iter_chunk<'a>(&'a self, shape: Vec<Range<usize>>) -> IterVectorGridChunk<'a, ItemType> {
        IterVectorGridChunk { source: self, ended: false, location: shape.iter().map(|size| {size.start as isize}).collect(), shape }
    }
}