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141 lines
3.4 KiB
141 lines
3.4 KiB
use std::env::args;
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use std::io::stdout;
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use std::io::Write;
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use std::iter::repeat;
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use std::thread::sleep;
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use std::time::Duration;
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#[derive(Clone, Copy, Debug)]
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struct Color(u8, u8, u8);
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impl Color {
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fn black() -> Color {
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Color(0, 0, 0)
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}
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fn white() -> Color {
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Color(255, 255, 255)
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}
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fn gray50() -> Color {
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Color(128, 128, 128)
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}
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fn red() -> Color {
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Color(255, 0, 0)
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}
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fn green() -> Color {
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Color(0, 255, 0)
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}
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fn blue() -> Color {
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Color(0, 0, 255)
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}
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fn yellow() -> Color {
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Color(255, 255, 0)
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}
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fn cyan() -> Color {
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Color(0, 255, 255)
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}
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fn magenta() -> Color {
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Color(255, 0, 255)
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}
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fn complement(&self) -> Color {
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Color(255 - self.0, 255 - self.1, 255 - self.2)
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}
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}
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fn interpolate_u8(b0: u8, b1: u8, a: f64) -> u8 {
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let b0 = b0 as f64;
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let b1 = b1 as f64;
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((1.0 - a) * b0 + a * b1) as u8
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}
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fn interpolate(c0: Color, c1: Color, a: f64) -> Color {
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Color(
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interpolate_u8(c0.0, c1.0, a),
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interpolate_u8(c0.1, c1.1, a),
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interpolate_u8(c0.2, c1.2, a),
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)
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}
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type Frame = Vec<Vec<Color>>;
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fn send<T: Write>(w: &mut T, f: &Frame) -> std::io::Result<()> {
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for l in f {
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for c in l {
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let Color(r, g, b) = c;
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let buf = &[*r, *g, *b];
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w.write_all(buf)?;
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}
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}
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w.flush()
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}
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const DEFAULT_LOOP_TIME: usize = 120;
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fn main() -> std::io::Result<()> {
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let args = args().collect::<Vec<_>>();
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eprintln!("executing {}", args[0]);
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let x_size = args[1].parse::<usize>().unwrap();
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let y_size = args[2].parse::<usize>().unwrap();
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let loop_time = args[3].parse::<usize>().unwrap_or(DEFAULT_LOOP_TIME);
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eprintln!(
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"screen size {}x{}, loop time {:?}s",
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x_size, y_size, loop_time
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);
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let mut border = 0;
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while (x_size - 2 * border) * (y_size - 2 * border) > x_size * y_size / 2 {
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border += 1;
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}
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let t_frame = 0.040; // s
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let delay = Duration::new(0, (1_000_000_000.0 * t_frame) as u32);
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let mut previous_color = Color::blue();
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let colors = vec![
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Color::red(),
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Color::yellow(),
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Color::green(),
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Color::cyan(),
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Color::blue(),
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Color::magenta(),
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];
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let mut color_index = 0;
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let mut next_color = colors[color_index];
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// time to interpolate from one color to the next
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let t_interpolate = (loop_time as f64) / (colors.len() as f64); // s
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let delta_a = t_frame / t_interpolate;
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let mut a = 0.0;
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eprint!("delta_a {}", delta_a);
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loop {
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let c0 = interpolate(previous_color, next_color, a);
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let c1 = c0.complement();
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let mut frame = repeat(repeat(c0).take(x_size).collect::<Vec<_>>())
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.take(y_size)
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.collect::<Vec<_>>();
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for x in border..(x_size - border) {
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for y in border..(y_size - border) {
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frame[y][x] = c1
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}
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}
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a += delta_a;
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if a >= 1.0 {
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a = 0.0;
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color_index += 1;
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if color_index >= colors.len() {
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color_index = 0;
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}
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previous_color = next_color;
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next_color = colors[color_index];
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}
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let mut buf = Vec::with_capacity(x_size * y_size * 3);
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send(&mut buf, &frame)?;
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stdout().write_all(&buf)?;
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stdout().flush()?;
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sleep(delay);
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}
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}
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