ggplot_rs/geom/
bin2d.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::bin2d::StatBin2d;
10use crate::stat::Stat;
11use crate::theme::Theme;
12
13use super::{Geom, GeomParams};
14
15/// 2D binning geometry — filled rectangles with fill color from count.
16pub struct GeomBin2d {
17    pub color: (u8, u8, u8),
18    pub alpha: f64,
19    pub line_width: f64,
20}
21
22impl Default for GeomBin2d {
23    fn default() -> Self {
24        GeomBin2d {
25            color: (50, 50, 50),
26            alpha: 1.0,
27            line_width: 0.2,
28        }
29    }
30}
31
32impl Geom for GeomBin2d {
33    fn draw(
34        &self,
35        data: &DataFrame,
36        coord: &dyn Coord,
37        scales: &ScaleSet,
38        _theme: &Theme,
39        backend: &mut dyn DrawBackend,
40    ) -> Result<(), RenderError> {
41        let xmin_col = data
42            .column("xmin")
43            .ok_or(RenderError::MissingAesthetic("xmin".into()))?;
44        let xmax_col = data
45            .column("xmax")
46            .ok_or(RenderError::MissingAesthetic("xmax".into()))?;
47        let ymin_col = data
48            .column("ymin")
49            .ok_or(RenderError::MissingAesthetic("ymin".into()))?;
50        let ymax_col = data
51            .column("ymax")
52            .ok_or(RenderError::MissingAesthetic("ymax".into()))?;
53        let fill_col = data.column("fill");
54
55        let plot_area = backend.plot_area();
56        let x_scale = scales.get(&Aesthetic::X);
57        let y_scale = scales.get(&Aesthetic::Y);
58
59        for i in 0..data.nrows() {
60            let nxmin = x_scale.map(|s| s.map(&xmin_col[i])).unwrap_or(0.0);
61            let nxmax = x_scale.map(|s| s.map(&xmax_col[i])).unwrap_or(0.0);
62            let nymin = y_scale.map(|s| s.map(&ymin_col[i])).unwrap_or(0.0);
63            let nymax = y_scale.map(|s| s.map(&ymax_col[i])).unwrap_or(0.0);
64
65            let (left, top) = coord.transform((nxmin, nymax), &plot_area);
66            let (right, bottom) = coord.transform((nxmax, nymin), &plot_area);
67
68            let fill_color = fill_col
69                .and_then(|fc| scales.map_color(&Aesthetic::Fill, &fc[i]))
70                .unwrap_or((97, 156, 255));
71
72            backend.draw_rect(
73                (left, top.min(bottom)),
74                (right, top.max(bottom)),
75                &RectStyle {
76                    fill: Some(fill_color),
77                    stroke: Some(self.color),
78                    stroke_width: self.line_width,
79                    alpha: self.alpha,
80                    clip: true,
81                },
82            )?;
83        }
84
85        Ok(())
86    }
87
88    fn required_aes(&self) -> Vec<Aesthetic> {
89        vec![Aesthetic::X, Aesthetic::Y]
90    }
91
92    fn default_stat(&self) -> Box<dyn Stat> {
93        Box::new(StatBin2d::default())
94    }
95
96    fn default_position(&self) -> Box<dyn Position> {
97        Box::new(PositionIdentity)
98    }
99
100    fn default_params(&self) -> GeomParams {
101        GeomParams::default()
102    }
103
104    fn name(&self) -> &str {
105        "bin2d"
106    }
107}
ggplot_rs/geom/bin2d.rs

ggplot_rs/geom/
bin2d.rs
