dataviz\figure\display/
hovercartesian.rs

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
use ab_glyph::FontRef;
use image::ImageBuffer;
use imageproc::drawing::{draw_line_segment_mut, draw_text_mut, text_size};

use crate::figure::{
    canvas::pixelcanvas::PixelCanvas, figuretypes::cartesiangraph::CartesianGraph,
};

use super::hover::Hover;

impl Hover for CartesianGraph {
    fn handle_hover(&self, mouse_x: u32, mouse_y: u32, canvas: &PixelCanvas) -> Option<Vec<u32>> {
        if let Some(((x, y), value)) = self.find_closest_point(mouse_x, mouse_y, canvas) {
            let mut img =
                ImageBuffer::from_raw(canvas.width, canvas.height, canvas.buffer.clone()).unwrap();

            let font = self.get_font(self.config.font_label.as_bytes());
            let scale = ab_glyph::PxScale { x: 12.0, y: 12.0 };
            let coord_text = format!("({:.2}, {:.2}) = {:.2}", x, y, value);
            let text_size = text_size(scale, &font, &coord_text).0 as i32;

            let rect_x = mouse_x as i32 + 10;
            let rect_y = mouse_y as i32 - 30;
            let rect_width = text_size + 20;
            let rect_height = 25;

            let rect_x = rect_x.max(0).min((canvas.width as i32 - rect_width) as i32);
            let rect_y = rect_y
                .max(0)
                .min((canvas.height as i32 - rect_height) as i32);

            for y in rect_y..(rect_y + rect_height) {
                for x in rect_x..(rect_x + rect_width) {
                    if x >= 0 && y >= 0 && (x as u32) < canvas.width && (y as u32) < canvas.height {
                        img.put_pixel(x as u32, y as u32, image::Rgb([255, 255, 255]));
                    }
                }
            }

            for x in rect_x..(rect_x + rect_width) {
                if rect_y >= 0 && (x as u32) < canvas.width {
                    img.put_pixel(x as u32, rect_y as u32, image::Rgb([0, 0, 0]));
                    img.put_pixel(
                        x as u32,
                        (rect_y + rect_height - 1) as u32,
                        image::Rgb([0, 0, 0]),
                    );
                }
            }

            for y in rect_y..(rect_y + rect_height) {
                if rect_x >= 0 && (y as u32) < canvas.height {
                    img.put_pixel(rect_x as u32, y as u32, image::Rgb([0, 0, 0]));
                    img.put_pixel(
                        (rect_x + rect_width - 1) as u32,
                        y as u32,
                        image::Rgb([0, 0, 0]),
                    );
                }
            }

            draw_text_mut(
                &mut img,
                image::Rgb([0, 0, 0]),
                rect_x + 10,
                rect_y + 5,
                scale,
                &font,
                &coord_text,
            );

            let (px, py) = self.to_canvas_coordinates(x, y, canvas);
            draw_line_segment_mut(
                &mut img,
                (px as f32, py as f32),
                (mouse_x as f32, mouse_y as f32),
                image::Rgb([255, 0, 0]), // Line color
            );

            return Some(
                img.pixels()
                    .map(|pixel: &image::Rgb<u8>| {
                        let [r, g, b] = pixel.0;
                        (r as u32) << 16 | (g as u32) << 8 | b as u32
                    })
                    .collect(),
            );
        }
        None
    }

    fn find_closest_point(
        &self,
        mouse_x: u32,
        mouse_y: u32,
        canvas: &PixelCanvas,
    ) -> Option<((f64, f64), f64)> {
        let scale_x = (canvas.width - 2 * canvas.margin) as f64 / (self.x_max - self.x_min);
        let scale_y = (canvas.height - 2 * canvas.margin) as f64 / (self.y_max - self.y_min);

        self.datasets
            .iter()
            .flat_map(|dataset| {
                dataset.points.iter().map(move |&(x, y)| {
                    let px = canvas.margin as f64 + (x - self.x_min) * scale_x;
                    let py =
                        canvas.height as f64 - canvas.margin as f64 - (y - self.y_min) * scale_y;
                    let dist =
                        ((mouse_x as f64 - px).powi(2) + (mouse_y as f64 - py).powi(2)).sqrt();
                    ((x, y), dist)
                })
            })
            .min_by(|&(_, d1), &(_, d2)| d1.partial_cmp(&d2).unwrap())
            .map(|((x, y), _)| ((x, y), y))
    }

    fn to_canvas_coordinates(&self, x: f64, y: f64, canvas: &PixelCanvas) -> (u32, u32) {
        let scale_x = (canvas.width - 2 * canvas.margin) as f64 / (self.x_max - self.x_min);
        let scale_y = (canvas.height - 2 * canvas.margin) as f64 / (self.y_max - self.y_min);

        let px = ((x - self.x_min) * scale_x + canvas.margin as f64) as u32;
        let py = (canvas.height as f64 - canvas.margin as f64 - (y - self.y_min) * scale_y) as u32;

        (px, py)
    }

    fn get_font<'a>(&self, font_data: &'a [u8]) -> FontRef<'a> {
        FontRef::try_from_slice(&font_data).unwrap()
    }
}