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Add simple sierpinski triangle script
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sierpinski
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sierpinski
···
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#!/usr/bin/env -S cargo eval --
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// cargo-deps: argh = "0.1"
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use argh::FromArgs;
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const TRIANGLE: char = '▲';
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#[derive(FromArgs)]
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#[argh(description = "Prints a Sierpinski triangle.")]
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struct App {
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#[argh(positional, description = "size of the Sierpinski triangle.")]
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size: Option<u8>,
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}
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fn main() {
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let App { size } = argh::from_env();
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let size = size.unwrap_or(1);
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let height = 2_usize.pow(size as u32);
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let width = (2 * height) - 1;
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let mut bounding_box = vec![vec![0_u16; width]; height];
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bounding_box[0][height - 1] = 1;
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let mut last_row = bounding_box[0].clone();
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for (i, row) in bounding_box.iter_mut().skip(1).enumerate() {
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for (j, cell) in row.iter_mut().enumerate() {
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let top_left = last_row.get(j - 1).unwrap_or(&0);
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let top_right = last_row.get(j + 1).unwrap_or(&0);
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*cell = top_left + top_right;
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}
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last_row = row.clone();
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}
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for row in bounding_box {
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for cell in row {
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if cell == 0 || cell % 2 == 0 {
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print!(" ");
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} else {
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print!("{}", TRIANGLE);
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}
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}
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println!();
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}
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}