Hacked some more on this.
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13
README.md
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13
README.md
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@ -0,0 +1,13 @@
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# ttylia - Julia fractals on tty
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This is intended to write the output to a DIGITAL VT220 terminal.
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```
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sudo chown $USER /dev/ttyUSB0
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stty -F /dev/ttyUSB0 raw 19200
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cargo run > /dev/ttyUSB0
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```
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Note: 19200 bits per second gives about 2 frames per second (a frame
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is 40x24 chars, a char is 8 data bits + start and stop bit, so 10
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bits).
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188
src/main.rs
188
src/main.rs
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@ -1,9 +1,17 @@
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use num_complex::Complex32;
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use std::{io::{self, Write}, thread::sleep, time::{Duration, Instant}};
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const CHARS: &[u8; 33] = b"@. .,:;-~+*i=xom\\//11II77OO77MMMM";
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const CHARS: &[u8; 13] = b"\xA1\xA2\xA3\xA4\xA5\xA6\xA7\xA8\xA9\xA9\xA9\xA9\xA9";
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fn main() {
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const CSI: u8 = b'\x9b'; // Start of control sequence, equivalent to "\x1B["
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fn csi(code: &[u8]) -> Vec<u8> {
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let mut res = vec![CSI]; // or vec![0x1B, b'['] for 7-bit compat.
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res.extend(code);
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res
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}
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fn main() -> Result<(), io::Error> {
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const WIDTH: u16 = 40;
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const HEIGHT: u16 = 24;
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const SY: f32 = 3.2 / (HEIGHT as f32);
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@ -17,10 +25,22 @@ fn main() {
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let mut rotor = Complex32 { re: 1., im: frame_time.as_secs_f32() * 0.2 };
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let mut frame = 0;
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let mut out = io::stdout().lock();
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out.write_all(b"\x1B[2J").unwrap();
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out.write_all(&csi(b"2J"))?;
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out.write_all(&csi(b"?25l"))?;
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out.write_all(b"\x1B)@\x1B~")?; // Enable custom character set
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define_pixels(&mut out);
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//out.write_all(b"\r\n\x1B#6 Hello \xA0\xA1\xA2\xA3\xA4\xA5\xA6 World\r\n").unwrap();
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//return;
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loop {
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let frame_start = Instant::now();
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c *= rotor;
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/*eprintln!("{:.4} / {:+.4} {:+.4} / {:+.4}",
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c.l1_norm(),
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(c.l1_norm() - 1.),
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(rotor.l1_norm() - 1.),
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(c.l1_norm() - 1.) * (rotor.l1_norm() - 1.));*/
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if c.norm_sqr() > 2. {
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rotor *= (1. / rotor.norm_sqr()).sqrt();
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}
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@ -61,9 +81,169 @@ fn main() {
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}
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}
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fn define_pixels(out: &mut impl Write) {
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let chars = [
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chardef([
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0b1111_1110,
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0b1111_1110,
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0b1111_1110,
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0b1111_1110,
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0b1111_1110,
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0b1111_1110,
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0b1111_1110,
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0b1111_1110,
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0b1111_1110,
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0b0000_0000,
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]),
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chardef([
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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]),
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chardef([ // 1 pixel
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0001_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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]),
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chardef([ // 4 pixels
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0010_1000,
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0b0000_0000,
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0b0010_1000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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]),
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chardef([ // 5 pixels
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0b0000_0000,
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0b0000_0000,
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0b0100_0100,
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0b0000_0000,
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0b0001_0000,
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0b0000_0000,
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0b0100_0100,
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0b0000_0000,
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0b0000_0000,
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0b0000_0000,
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]),
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chardef([ // 6 pixels
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0b0000_0000,
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0b0100_1000,
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0b0000_0000,
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0b0000_0000,
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0b0100_1000,
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0b0000_0000,
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0b0000_0000,
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0b0100_1000,
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0b0000_0000,
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0b0000_0000,
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]),
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chardef([ // 9 pixels
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0b0000_0010,
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0b0001_0000,
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0b1000_0000,
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0b0000_0010,
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0b0001_0000,
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0b1000_0000,
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0b0000_0010,
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0b0001_0000,
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0b1000_0000,
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0b0000_0000,
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]),
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chardef([ // half
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0b1010_1010,
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0b0101_0100,
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0b1010_1010,
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0b0101_0100,
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0b1010_1010,
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0b0101_0100,
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0b1010_1010,
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0b0101_0100,
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0b1010_1010,
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0b0000_0000,
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]),
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chardef([
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0b1010_1010,
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0b0111_0100,
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0b1010_1010,
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0b0101_1100,
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0b1110_1010,
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0b0101_0100,
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0b1010_1010,
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0b0101_1100,
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0b1010_1010,
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0b0000_0000,
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]),
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chardef([
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0b1110_1110,
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0b0111_0110,
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0b1011_1010,
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0b0101_0100,
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0b1010_1010,
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0b0101_0100,
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0b1010_1010,
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0b0101_0100,
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0b1010_1010,
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0b0000_0000,
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]),
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];
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//eprintln!("Defining {} chars", chars.len());
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//eprintln!("Def: {chars:?}");
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out.write_all(b"\x1BP1;1;1{@").unwrap();
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if let Some((first, rest)) = chars.split_first() {
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out.write_all(first).unwrap();
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for ch in rest {
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out.write_all(b";").unwrap();
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out.write_all(ch).unwrap();
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}
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}
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out.write_all(b"\x1B\\").unwrap();
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}
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fn chardef(bits: [u8; 10]) -> [u8;17] {
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let mut result = [0;17];
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for y in 0..6 {
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for x in 0..8 {
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if bits[y] & (0b10000000 >> x) > 0 {
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result[x] |= 1 << y;
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}
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}
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}
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for y in 0..4 {
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for x in 0..8 {
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if bits[y+6] & (0b10000000 >> x) > 0 {
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result[9 + x] |= 1 << y;
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}
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}
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}
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for c in &mut result {
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*c += b'?';
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}
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result[8] = b'/';
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//eprintln!("chardef2: {}", String::from_utf8_lossy(&result));
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result
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}
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fn pixel(i: u8) -> u8 {
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CHARS[usize::from(i)]
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// u32::from_be_bytes([0xff, i * 6, i + i / 2, i.saturating_mul(8)])
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}
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fn julia(z: Complex32, c: Complex32, max_i: u8) -> u8 {
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