vividry 0.2.2

A hobbyist rewrite of the `pastel` project
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

pub mod helper;
use std::str::FromStr;

#[derive(Debug, Clone)]
pub struct Color {
    pub hue: f64,
    pub saturation: f64,
    pub value: f64,
}
impl Color {

    pub fn from_rgbf(red: f64, green: f64, blue: f64) -> Result<Self, String> {

        let r = red / 255.0;
        let g = green / 255.0;
        let b = blue/ 255.0;

        // Find maximum and minimum RGB values
        let max = r.max(g).max(b);
        let min = r.min(g).min(b);
        let delta = max - min;

        // Calculate Value component (maximum RGB value)
        let v = max;

        // Calculate Saturation
        let s = if max != 0.0 {
            delta / max
        } else {
            0.0
        };

        // Calculate Hue
        let mut h = 0.0;
        if delta != 0.0 {
            if max == r {
                h = (g - b) / delta;
            } else if max == g {
                h = 2.0 + (b - r) / delta;
            } else {
                h = 4.0 + (r - g) / delta;
            }
            h *= 60.0;
            if h < 0.0 {
                h += 360.0;
            }
        }

        Ok(Color { hue:h, saturation:s, value:v })
    }
    pub fn from_rgb(red: u32, green: u32, blue: u32) -> Result<Self, String> {
        let r = red as f64 / 255.0;
        let g = green as f64 / 255.0;
        let b = blue as f64 / 255.0;

        // Find maximum and minimum RGB values
        let max = r.max(g).max(b);
        let min = r.min(g).min(b);
        let delta = max - min;

        // Calculate Value component (maximum RGB value)
        let v = max;

        // Calculate Saturation
        let s = if max != 0.0 {
            delta / max
        } else {
            0.0
        };

        // Calculate Hue
        let mut h = 0.0;
        if delta != 0.0 {
            if max == r {
                h = (g - b) / delta;
            } else if max == g {
                h = 2.0 + (b - r) / delta;
            } else {
                h = 4.0 + (r - g) / delta;
            }
            h *= 60.0;
            if h < 0.0 {
                h += 360.0;
            }
        }

        Ok(Color { hue:h, saturation:s, value:v })
    }
    pub fn from_hex(hex: &str) -> Result<Self, String> {
        let trimmed = hex
            .strip_prefix("#")
            .unwrap_or(hex)
            .chars()
            .collect::<Vec<_>>();
        let chunks = &trimmed
            .chunks(match trimmed.len() {
                3 => 1,
                6 => 2,
                _ => return Err("Improper hex length".to_owned()),
            })
            .map(|x| x.iter().collect::<String>())
            .map(|x| {
                u32::from_str_radix(x.as_str(), 16).expect("Unable to parse hexidecimal value")
            })
            .collect::<Vec<_>>();

        Ok(Color::from_rgb(chunks[0], chunks[1], chunks[2])?)
    }

    pub fn to_rgb(&self) -> [f64; 3] {
        fn is_between(value: f64, min: f64, max: f64) -> bool {
            min <= value && value < max
        }
        let c = self.value * self.saturation;
        let h = self.hue / 60.0;
        let x = c * (1.0 - ((h % 2.0) - 1.0).abs());
        let m = self.value - c;

        let (r, g, b): (f64, f64, f64) = if is_between(h, 0.0, 1.0) {
            (c, x, 0.0)
        } else if is_between(h, 1.0, 2.0) {
            (x, c, 0.0)
        } else if is_between(h, 2.0, 3.0) {
            (0.0, c, x)
        } else if is_between(h, 3.0, 4.0) {
            (0.0, x, c)
        } else if is_between(h, 4.0, 5.0) {
            (x, 0.0, c)
        } else {
            (c, 0.0, x)
        };

        [
            ((r + m) * 255.0),
            ((g + m) * 255.0),
            ((b + m) * 255.0),
        ]
    }

    pub fn to_hex(&self) -> String {
        format!(
            "{}",
            self.to_rgb()
                .iter()
                .map(|x| format!("{:02x}", x.round() as u32))
                .collect::<String>()
        )
    }
}

impl FromStr for Color {
    type Err = String;
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        Ok(Color::from_hex(s)?)
    }
}