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