sark_grids/util/
canvas.rs

1use crate::{GridPoint, GridShape, GridSize};
2use glam::UVec2;
3
4pub struct Canvas {
5    size: UVec2,
6    string: String,
7}
8
9impl Canvas {
10    pub fn new(size: impl GridSize) -> Canvas {
11        let string = str::repeat(".", size.tile_count());
12
13        Canvas {
14            size: size.to_uvec2(),
15            string,
16        }
17    }
18
19    pub fn put(&mut self, pos: impl GridPoint, glyph: char) {
20        let i = self.to_index(pos);
21        self.string
22            .replace_range(i..i + 1, std::str::from_utf8(&[glyph as u8]).unwrap());
23    }
24
25    pub fn put_bl(&mut self, pos: impl GridPoint, glyph: char) {
26        let i = self.to_index(pos.to_ivec2() - self.size.as_ivec2() / 2);
27        self.string
28            .replace_range(i..i + 1, std::str::from_utf8(&[glyph as u8]).unwrap());
29    }
30
31    fn to_index(&self, point: impl GridPoint) -> usize {
32        let p = point.to_ivec2() + self.size.as_ivec2() / 2;
33        p.as_index(self.size)
34    }
35
36    pub fn print(&self) {
37        let chars: Vec<_> = self.string.chars().collect();
38        for line in chars.chunks(self.size.x as usize).rev() {
39            println!("{}", String::from_iter(line.iter()));
40        }
41    }
42
43    pub fn put_shape(&mut self, shape: impl GridShape, glyph: char) {
44        for p in shape.iter() {
45            self.put(p, glyph);
46        }
47    }
48
49    pub fn clear(&mut self) {
50        self.string = str::repeat(".", self.size.tile_count());
51    }
52}
53
54#[cfg(test)]
55mod tests {
56    use super::Canvas;
57
58    #[test]
59    #[ignore]
60    fn odd() {
61        let mut canvas = Canvas::new([5, 5]);
62        canvas.put([-2, -2], '*');
63        canvas.put([-1, -1], '*');
64        canvas.put([0, 0], '*');
65        canvas.put([1, 1], '*');
66        canvas.put([2, 2], '*');
67
68        canvas.print();
69    }
70
71    #[test]
72    #[ignore]
73    fn even() {
74        let mut canvas = Canvas::new([6, 6]);
75        canvas.put([-3, -3], '*');
76        canvas.put([-2, -2], '*');
77        canvas.put([-1, -1], '*');
78        canvas.put([0, 0], '*');
79        canvas.put([1, 1], '*');
80        canvas.put([2, 2], '*');
81
82        canvas.print();
83    }
84}
sark_grids/util/canvas.rs

sark_grids/util/
canvas.rs
