51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
#![feature(step_by)]
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extern crate termion;
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use termion::raw::IntoRawMode;
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use termion::input::{TermRead, Key};
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use std::io::{Write, stdout, stdin};
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fn rainbow<W: Write>(stdout: &mut W, blue: u8) {
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write!(stdout, "{}", termion::cursor::Goto(1, 1)).unwrap();
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for red in (0..255).step_by(8 as u8) {
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for green in (0..255).step_by(4) {
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write!(stdout, "{} ", termion::color::Bg(termion::color::Rgb(red, green, blue))).unwrap();
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}
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write!(stdout, "\n\r").unwrap();
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}
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writeln!(stdout, "{}b = {}", termion::style::Reset, blue).unwrap();
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}
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fn main() {
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let stdin = stdin();
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let mut stdout = stdout().into_raw_mode().unwrap();
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writeln!(stdout, "{}{}{}Use the arrow keys to change the blue in the rainbow.",
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termion::clear::All,
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termion::cursor::Goto(1, 1),
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termion::cursor::Hide).unwrap();
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let mut blue = 0u8;
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for c in stdin.keys() {
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match c.unwrap() {
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Key::Up => {
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blue = blue.saturating_add(4);
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rainbow(&mut stdout, blue);
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},
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Key::Down => {
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blue = blue.saturating_sub(4);
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rainbow(&mut stdout, blue);
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},
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Key::Char('q') => break,
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_ => {},
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}
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stdout.flush().unwrap();
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}
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write!(stdout, "{}", termion::cursor::Show).unwrap();
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}
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