plotters/data/
data_range.rs

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1use std::cmp::{Ordering, PartialOrd};
2use std::iter::IntoIterator;
3use std::ops::Range;
4
5use num_traits::{One, Zero};
6
7/// Build a range that fits the data
8///
9/// - `iter`: the iterator over the data
10/// - **returns** The resulting range
11///
12/// ```rust
13/// use plotters::data::fitting_range;
14///
15/// let data = [4, 14, -2, 2, 5];
16/// let range = fitting_range(&data);
17/// assert_eq!(range, std::ops::Range { start: -2, end: 14 });
18/// ```
19pub fn fitting_range<'a, T: 'a, I: IntoIterator<Item = &'a T>>(iter: I) -> Range<T>
20where
21    T: Zero + One + PartialOrd + Clone,
22{
23    let (mut lb, mut ub) = (None, None);
24
25    for value in iter.into_iter() {
26        if let Some(Ordering::Greater) = lb
27            .as_ref()
28            .map_or(Some(Ordering::Greater), |lbv: &T| lbv.partial_cmp(value))
29        {
30            lb = Some(value.clone());
31        }
32
33        if let Some(Ordering::Less) = ub
34            .as_ref()
35            .map_or(Some(Ordering::Less), |ubv: &T| ubv.partial_cmp(value))
36        {
37            ub = Some(value.clone());
38        }
39    }
40
41    lb.unwrap_or_else(Zero::zero)..ub.unwrap_or_else(One::one)
42}
plotters/data/data_range.rs

plotters/data/
data_range.rs
