ggplot_rs/geom/
col.rs

1use crate::aes::Aesthetic;
2use crate::coord::Coord;
3use crate::data::DataFrame;
4use crate::position::identity::PositionIdentity;
5use crate::position::Position;
6use crate::render::backend::{DrawBackend, RectStyle};
7use crate::render::RenderError;
8use crate::scale::ScaleSet;
9use crate::stat::identity::StatIdentity;
10use crate::stat::Stat;
11use crate::theme::Theme;
12
13use super::{Geom, GeomParams};
14
15/// Column geometry — like GeomBar but with pre-computed heights (uses StatIdentity).
16pub struct GeomCol {
17    pub fill: (u8, u8, u8),
18    pub color: (u8, u8, u8),
19    pub alpha: f64,
20    pub width: f64,
21}
22
23impl Default for GeomCol {
24    fn default() -> Self {
25        GeomCol {
26            fill: (97, 156, 255),
27            color: (50, 50, 50),
28            alpha: 1.0,
29            width: 0.9,
30        }
31    }
32}
33
34impl Geom for GeomCol {
35    fn draw(
36        &self,
37        data: &DataFrame,
38        coord: &dyn Coord,
39        scales: &ScaleSet,
40        _theme: &Theme,
41        backend: &mut dyn DrawBackend,
42    ) -> Result<(), RenderError> {
43        let x_col = data
44            .column("x")
45            .ok_or(RenderError::MissingAesthetic("x".into()))?;
46        let y_col = data
47            .column("y")
48            .ok_or(RenderError::MissingAesthetic("y".into()))?;
49        let fill_col = data.column("fill");
50
51        let plot_area = backend.plot_area();
52        let x_scale = scales.get(&Aesthetic::X);
53        let y_scale = scales.get(&Aesthetic::Y);
54        let x_is_discrete = x_scale.map(|s| s.is_discrete()).unwrap_or(false);
55
56        for i in 0..data.nrows() {
57            let nx = x_scale.map(|s| s.map(&x_col[i])).unwrap_or(0.0);
58            let ny = y_scale.map(|s| s.map(&y_col[i])).unwrap_or(0.0);
59            let ny_base = y_scale
60                .map(|s| s.map(&crate::data::Value::Float(0.0)))
61                .unwrap_or(0.0);
62
63            let half_width = if x_is_discrete {
64                let n_breaks = x_scale.map(|s| s.breaks().len()).unwrap_or(1);
65                let bar_frac = self.width / (n_breaks.max(1) as f64 * 1.1);
66                bar_frac / 2.0
67            } else {
68                0.02
69            };
70
71            let (left_px, top_px) = coord.transform((nx - half_width, ny), &plot_area);
72            let (right_px, bottom_px) = coord.transform((nx + half_width, ny_base), &plot_area);
73
74            let (fr, fg, fb) = if let Some(fc) = fill_col {
75                scales
76                    .map_color(&Aesthetic::Fill, &fc[i])
77                    .unwrap_or(self.fill)
78            } else {
79                self.fill
80            };
81
82            backend.draw_rect(
83                (left_px, top_px.min(bottom_px)),
84                (right_px, top_px.max(bottom_px)),
85                &RectStyle {
86                    fill: Some((fr, fg, fb)),
87                    stroke: Some(self.color),
88                    stroke_width: 0.5,
89                    alpha: self.alpha,
90                    clip: true,
91                },
92            )?;
93        }
94
95        Ok(())
96    }
97
98    fn required_aes(&self) -> Vec<Aesthetic> {
99        vec![Aesthetic::X, Aesthetic::Y]
100    }
101
102    fn default_stat(&self) -> Box<dyn Stat> {
103        Box::new(StatIdentity)
104    }
105
106    fn default_position(&self) -> Box<dyn Position> {
107        Box::new(PositionIdentity)
108    }
109
110    fn default_params(&self) -> GeomParams {
111        GeomParams::default()
112    }
113
114    fn name(&self) -> &str {
115        "col"
116    }
117
118    fn set_series_color(&mut self, color: (u8, u8, u8)) {
119        self.fill = color;
120    }
121}
ggplot_rs/geom/col.rs

ggplot_rs/geom/
col.rs
