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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178

use std::f64;

use svg;

use crate::axis;
use crate::representation::ContinuousRepresentation;
use crate::style;
use crate::svg_render;
use crate::text_render;

/// `Style` follows the 'optional builder' pattern
/// Each field is a `Option` which start as `None`
/// Each can be set with setter methods and instances
/// of `Style` can be overlaid to set many at once.
/// Settings will be cloned in and out of it.
#[derive(Debug, Default)]
pub struct Style {
    marker: Option<style::Marker>,
    colour: Option<String>,
    size: Option<f32>,
}

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

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

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

        if let Some(v) = other.size {
            self.size = Some(v)
        }
    }
}

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

    fn get_marker(&self) -> &Option<style::Marker> {
        &self.marker
    }

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

    fn get_size(&self) -> &Option<f32> {
        &self.size
    }
}

/// The scatter *representation*.
/// It knows its data as well how to style itself
#[derive(Debug)]
pub struct Scatter {
    pub data: Vec<(f64, f64)>,
    style: Style,
}

impl Scatter {
    pub fn from_slice(v: &[(f64, f64)]) -> Self {
        let mut data: Vec<(f64, f64)> = vec![];
        for &(x, y) in v {
            data.push((x, y));
        }

        Scatter {
            data,
            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 ContinuousRepresentation for Scatter {
    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::ContinuousAxis,
        y_axis: &axis::ContinuousAxis,
        face_width: f64,
        face_height: f64,
    ) -> svg::node::element::Group {
        svg_render::draw_face_points(
            &self.data,
            x_axis,
            y_axis,
            face_width,
            face_height,
            &self.style,
        )
    }

    fn to_text(
        &self,
        x_axis: &axis::ContinuousAxis,
        y_axis: &axis::ContinuousAxis,
        face_width: u32,
        face_height: u32,
    ) -> String {
        text_render::render_face_points(
            &self.data,
            x_axis,
            y_axis,
            face_width,
            face_height,
            &self.style,
        )
    }
}