use crate::GridPoint;
use glam::IVec2;
pub struct Canvas {
size: IVec2,
string: String,
}
impl Canvas {
pub fn new(size: impl GridPoint) -> Canvas {
let string = str::repeat(" ", size.len());
Canvas {
size: size.as_ivec2(),
string,
}
}
pub fn put(&mut self, pos: impl GridPoint, glyph: char) {
let i = self.to_index(pos);
self.string
.replace_range(i..i + 1, std::str::from_utf8(&[glyph as u8]).unwrap());
}
fn to_index(&self, point: impl GridPoint) -> usize {
let p = point.as_ivec2() + self.size / 2;
let [x, y] = p.to_array();
y as usize * self.size.x as usize + x as usize
}
pub fn print(&self) {
let chars: Vec<_> = self.string.replace(' ', ".").chars().collect();
for line in chars.chunks(self.size.x as usize).rev() {
println!("{}", String::from_iter(line.iter()));
}
}
}
#[cfg(test)]
mod tests {
use super::Canvas;
#[test]
fn odd() {
let mut canvas = Canvas::new([5, 5]);
canvas.put([-2, -2], '*');
canvas.put([-1, -1], '*');
canvas.put([0, 0], '*');
canvas.put([1, 1], '*');
canvas.put([2, 2], '*');
canvas.print();
}
#[test]
fn even() {
let mut canvas = Canvas::new([6, 6]);
canvas.put([-3, -3], '*');
canvas.put([-2, -2], '*');
canvas.put([-1, -1], '*');
canvas.put([0, 0], '*');
canvas.put([1, 1], '*');
canvas.put([2, 2], '*');
canvas.print();
}
}