plotlib 0.3.0

Plotting data structures and tools
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

/*!

Plot arbitrary functions

# Examples

```
# use plotlib::function::Function;
# use plotlib::view::View;
// y=x^2 between 0 and 10
let f = Function::new(|x| x*x, 0., 10.);
let v = View::new().add(&f);
```
*/

use std::f64;

use svg;

use axis;
use representation::Representation;
use svg_render;
use style;

#[derive(Debug, Default)]
pub struct Style {
    colour: Option<String>,
    width: Option<f32>,
}

impl Style {
    pub fn new() -> Self {
        Style {
            colour: None,
            width: None,
        }
    }

    pub fn overlay(&mut self, other: &Self) {
        if let Some(ref v) = other.colour {
            self.colour = Some(v.clone())
        }

        if let Some(ref v) = other.width {
            self.width = Some(v.clone())
        }
    }
}

impl style::Line for Style {
    fn colour<T>(&mut self, value: T) -> &mut Self
    where
        T: Into<String>,
    {
        self.colour = Some(value.into());
        self
    }

    fn get_colour(&self) -> &Option<String> {
        &self.colour
    }

    fn width<T>(&mut self, value: T) -> &mut Self
    where
        T: Into<f32>,
    {
        self.width = Some(value.into());
        self
    }

    fn get_width(&self) -> &Option<f32> {
        &self.width
    }
}

pub struct Function {
    pub data: Vec<(f64, f64)>,
    style: Style,
}

impl Function {
    pub fn new<F>(f: F, lower: f64, upper: f64) -> Self
    where
        F: Fn(f64) -> f64,
    {
        let sampling = (upper - lower) / 200.;
        let samples = (0..)
            .map(|x| lower + (x as f64 * sampling))
            .take_while(|&x| x <= upper);
        let values = samples.map(|s| (s, f(s))).collect();
        Function {
            data: values,
            style: Style::new(),
        }
    }

    pub fn style(mut self, style: &Style) -> Self {
        self.style.overlay(style);
        self
    }

    pub fn get_style(&self) -> &Style {
        &self.style
    }

    fn x_range(&self) -> (f64, f64) {
        let mut min = f64::INFINITY;
        let mut max = f64::NEG_INFINITY;
        for &(x, _) in &self.data {
            min = min.min(x);
            max = max.max(x);
        }
        (min, max)
    }

    fn y_range(&self) -> (f64, f64) {
        let mut min = f64::INFINITY;
        let mut max = f64::NEG_INFINITY;
        for &(_, y) in &self.data {
            min = min.min(y);
            max = max.max(y);
        }
        (min, max)
    }
}

impl Representation for Function {
    fn range(&self, dim: u32) -> (f64, f64) {
        match dim {
            0 => self.x_range(),
            1 => self.y_range(),
            _ => panic!("Axis out of range"),
        }
    }

    fn to_svg(
        &self,
        x_axis: &axis::Axis,
        y_axis: &axis::Axis,
        face_width: f64,
        face_height: f64,
    ) -> svg::node::element::Group {
        svg_render::draw_face_line(self, x_axis, y_axis, face_width, face_height, &self.style)
    }

    fn to_text(
        &self,
        x_axis: &axis::Axis,
        y_axis: &axis::Axis,
        face_width: u32,
        face_height: u32,
    ) -> String {
        "".into()
    }
}