gpui_component/chart/
line_chart.rs

1use std::rc::Rc;
2
3use gpui::{px, App, Bounds, Hsla, Pixels, SharedString, TextAlign, Window};
4use gpui_component_macros::IntoPlot;
5use num_traits::{Num, ToPrimitive};
6
7use crate::{
8    plot::{
9        scale::{Scale, ScaleLinear, ScalePoint, Sealed},
10        shape::Line,
11        AxisText, Grid, Plot, PlotAxis, StrokeStyle, AXIS_GAP,
12    },
13    ActiveTheme, PixelsExt,
14};
15
16#[derive(IntoPlot)]
17pub struct LineChart<T, X, Y>
18where
19    T: 'static,
20    X: PartialEq + Into<SharedString> + 'static,
21    Y: Copy + PartialOrd + Num + ToPrimitive + Sealed + 'static,
22{
23    data: Vec<T>,
24    x: Option<Rc<dyn Fn(&T) -> X>>,
25    y: Option<Rc<dyn Fn(&T) -> Y>>,
26    stroke: Option<Hsla>,
27    stroke_style: StrokeStyle,
28    dot: bool,
29    tick_margin: usize,
30}
31
32impl<T, X, Y> LineChart<T, X, Y>
33where
34    X: PartialEq + Into<SharedString> + 'static,
35    Y: Copy + PartialOrd + Num + ToPrimitive + Sealed + 'static,
36{
37    pub fn new<I>(data: I) -> Self
38    where
39        I: IntoIterator<Item = T>,
40    {
41        Self {
42            data: data.into_iter().collect(),
43            stroke: None,
44            stroke_style: Default::default(),
45            dot: false,
46            x: None,
47            y: None,
48            tick_margin: 1,
49        }
50    }
51
52    pub fn x(mut self, x: impl Fn(&T) -> X + 'static) -> Self {
53        self.x = Some(Rc::new(x));
54        self
55    }
56
57    pub fn y(mut self, y: impl Fn(&T) -> Y + 'static) -> Self {
58        self.y = Some(Rc::new(y));
59        self
60    }
61
62    pub fn stroke(mut self, stroke: impl Into<Hsla>) -> Self {
63        self.stroke = Some(stroke.into());
64        self
65    }
66
67    pub fn natural(mut self) -> Self {
68        self.stroke_style = StrokeStyle::Natural;
69        self
70    }
71
72    pub fn linear(mut self) -> Self {
73        self.stroke_style = StrokeStyle::Linear;
74        self
75    }
76
77    pub fn step_after(mut self) -> Self {
78        self.stroke_style = StrokeStyle::StepAfter;
79        self
80    }
81
82    pub fn dot(mut self) -> Self {
83        self.dot = true;
84        self
85    }
86
87    pub fn tick_margin(mut self, tick_margin: usize) -> Self {
88        self.tick_margin = tick_margin;
89        self
90    }
91}
92
93impl<T, X, Y> Plot for LineChart<T, X, Y>
94where
95    X: PartialEq + Into<SharedString> + 'static,
96    Y: Copy + PartialOrd + Num + ToPrimitive + Sealed + 'static,
97{
98    fn paint(&mut self, bounds: Bounds<Pixels>, window: &mut Window, cx: &mut App) {
99        let (Some(x_fn), Some(y_fn)) = (self.x.as_ref(), self.y.as_ref()) else {
100            return;
101        };
102
103        let width = bounds.size.width.as_f32();
104        let height = bounds.size.height.as_f32() - AXIS_GAP;
105
106        // X scale
107        let x = ScalePoint::new(self.data.iter().map(|v| x_fn(v)).collect(), vec![0., width]);
108
109        // Y scale, ensure start from 0.
110        let y = ScaleLinear::new(
111            self.data
112                .iter()
113                .map(|v| y_fn(v))
114                .chain(Some(Y::zero()))
115                .collect(),
116            vec![height, 10.],
117        );
118
119        // Draw X axis
120        let data_len = self.data.len();
121        let x_label = self.data.iter().enumerate().filter_map(|(i, d)| {
122            if (i + 1) % self.tick_margin == 0 {
123                x.tick(&x_fn(d)).map(|x_tick| {
124                    let align = match i {
125                        0 => {
126                            if data_len == 1 {
127                                TextAlign::Center
128                            } else {
129                                TextAlign::Left
130                            }
131                        }
132                        i if i == data_len - 1 => TextAlign::Right,
133                        _ => TextAlign::Center,
134                    };
135                    AxisText::new(x_fn(d).into(), x_tick, cx.theme().muted_foreground).align(align)
136                })
137            } else {
138                None
139            }
140        });
141
142        PlotAxis::new()
143            .x(height)
144            .x_label(x_label)
145            .stroke(cx.theme().border)
146            .paint(&bounds, window, cx);
147
148        // Draw grid
149        Grid::new()
150            .y((0..=3).map(|i| height * i as f32 / 4.0).collect())
151            .stroke(cx.theme().border)
152            .dash_array(&[px(4.), px(2.)])
153            .paint(&bounds, window);
154
155        // Draw line
156        let stroke = self.stroke.unwrap_or(cx.theme().chart_2);
157        let x_fn = x_fn.clone();
158        let y_fn = y_fn.clone();
159        let mut line = Line::new()
160            .data(&self.data)
161            .x(move |d| x.tick(&x_fn(d)))
162            .y(move |d| y.tick(&y_fn(d)))
163            .stroke(stroke)
164            .stroke_style(self.stroke_style)
165            .stroke_width(2.);
166
167        if self.dot {
168            line = line.dot().dot_size(8.).dot_fill_color(stroke);
169        }
170
171        line.paint(&bounds, window);
172    }
173}
gpui_component/chart/line_chart.rs

gpui_component/chart/
line_chart.rs
