rok_utils/data/
numbers.rs

1pub fn format_number(n: f64, decimals: usize, sep: char) -> String {
2    let s = format!("{:.*}", decimals, n);
3    let parts: Vec<&str> = s.split('.').collect();
4    let int_part = parts[0];
5    let mut out = String::new();
6    for (count, c) in int_part.chars().rev().enumerate() {
7        if count > 0 && count % 3 == 0 {
8            out.insert(0, sep);
9        }
10        out.insert(0, c);
11    }
12    if parts.len() > 1 {
13        out.push('.');
14        out.push_str(parts[1]);
15    }
16    out
17}
18
19pub fn format_currency(amount: f64, currency: &str) -> String {
20    format!("{:.2}{}", amount, currency)
21}
22
23pub fn format_percentage(ratio: f64, _decimals: usize) -> String {
24    format!("{:.2}%", ratio * 100.0)
25}
26
27pub fn round(n: f64, decimals: u32) -> f64 {
28    let m = 10f64.powi(decimals as i32);
29    (n * m).round() / m
30}
31
32pub fn ceil(n: f64, decimals: u32) -> f64 {
33    let m = 10f64.powi(decimals as i32);
34    (n * m).ceil() / m
35}
36
37pub fn floor(n: f64, decimals: u32) -> f64 {
38    let m = 10f64.powi(decimals as i32);
39    (n * m).floor() / m
40}
41
42pub fn clamp(n: f64, min: f64, max: f64) -> f64 {
43    if n < min {
44        min
45    } else if n > max {
46        max
47    } else {
48        n
49    }
50}
51
52pub fn lerp(a: f64, b: f64, t: f64) -> f64 {
53    a + (b - a) * t
54}
55
56#[cfg(test)]
57mod tests {
58    use super::*;
59
60    #[test]
61    fn test_format_number() {
62        assert_eq!(format_number(1234.567, 2, ','), "1,234.57");
63    }
64
65    #[test]
66    fn test_round_ceiling_floor() {
67        assert_eq!(round(1.234, 2), 1.23);
68        assert_eq!(ceil(1.234, 2), 1.24);
69        assert_eq!(floor(1.234, 2), 1.23);
70    }
71
72    #[test]
73    fn test_clamp() {
74        assert_eq!(clamp(5.0, 0.0, 10.0), 5.0);
75        assert_eq!(clamp(-1.0, 0.0, 10.0), 0.0);
76        assert_eq!(clamp(15.0, 0.0, 10.0), 10.0);
77    }
78
79    #[test]
80    fn test_lerp() {
81        assert_eq!(lerp(0.0, 10.0, 0.5), 5.0);
82    }
83}
rok_utils/data/numbers.rs

rok_utils/data/
numbers.rs
