ggplot_rs/geom/
tile.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/// Tile geometry — rectangle centered at (x, y) with given width/height.
16pub struct GeomTile {
17    pub fill: (u8, u8, u8),
18    pub color: (u8, u8, u8),
19    pub alpha: f64,
20    pub width: f64,
21    pub height: f64,
22    pub line_width: f64,
23}
24
25impl Default for GeomTile {
26    fn default() -> Self {
27        GeomTile {
28            fill: (97, 156, 255),
29            color: (50, 50, 50),
30            alpha: 1.0,
31            width: 1.0,
32            height: 1.0,
33            line_width: 0.5,
34        }
35    }
36}
37
38impl Geom for GeomTile {
39    fn draw(
40        &self,
41        data: &DataFrame,
42        coord: &dyn Coord,
43        scales: &ScaleSet,
44        _theme: &Theme,
45        backend: &mut dyn DrawBackend,
46    ) -> Result<(), RenderError> {
47        let x_col = data
48            .column("x")
49            .ok_or(RenderError::MissingAesthetic("x".into()))?;
50        let y_col = data
51            .column("y")
52            .ok_or(RenderError::MissingAesthetic("y".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        let half_w = self.width / 2.0;
60        let half_h = self.height / 2.0;
61
62        for i in 0..data.nrows() {
63            let cx = x_col[i].as_f64().unwrap_or(0.0);
64            let cy = y_col[i].as_f64().unwrap_or(0.0);
65
66            let nxmin = x_scale
67                .map(|s| s.map(&crate::data::Value::Float(cx - half_w)))
68                .unwrap_or(0.0);
69            let nxmax = x_scale
70                .map(|s| s.map(&crate::data::Value::Float(cx + half_w)))
71                .unwrap_or(0.0);
72            let nymin = y_scale
73                .map(|s| s.map(&crate::data::Value::Float(cy - half_h)))
74                .unwrap_or(0.0);
75            let nymax = y_scale
76                .map(|s| s.map(&crate::data::Value::Float(cy + half_h)))
77                .unwrap_or(0.0);
78
79            let (left, top) = coord.transform((nxmin, nymax), &plot_area);
80            let (right, bottom) = coord.transform((nxmax, nymin), &plot_area);
81
82            let fill_color = fill_col
83                .and_then(|fc| scales.map_color(&Aesthetic::Fill, &fc[i]))
84                .unwrap_or(self.fill);
85
86            backend.draw_rect(
87                (left, top.min(bottom)),
88                (right, top.max(bottom)),
89                &RectStyle {
90                    fill: Some(fill_color),
91                    stroke: Some(self.color),
92                    stroke_width: self.line_width,
93                    alpha: self.alpha,
94                    clip: true,
95                },
96            )?;
97        }
98
99        Ok(())
100    }
101
102    fn required_aes(&self) -> Vec<Aesthetic> {
103        vec![Aesthetic::X, Aesthetic::Y]
104    }
105
106    fn default_stat(&self) -> Box<dyn Stat> {
107        Box::new(StatIdentity)
108    }
109
110    fn default_position(&self) -> Box<dyn Position> {
111        Box::new(PositionIdentity)
112    }
113
114    fn default_params(&self) -> GeomParams {
115        GeomParams::default()
116    }
117
118    fn name(&self) -> &str {
119        "tile"
120    }
121
122    fn set_series_color(&mut self, color: (u8, u8, u8)) {
123        self.fill = color;
124    }
125}
ggplot_rs/geom/tile.rs

ggplot_rs/geom/
tile.rs
