Add randomness to the initial conditions

src/bin/lorenz/main.rs

@@ -5,6 +5,9 @@ use std::iter::repeat;
 use std::thread::sleep;
 use std::time::Duration;
 
+use rand::thread_rng;
+use rand::Rng;
+
 use pixelfoo::color::Color;
 
 type Frame = Vec<Vec<Color>>;
@@ -28,6 +31,8 @@ fn main() -> std::io::Result<()> {
     let arg = args[3].parse::<usize>().unwrap_or(DEFAULT_ARG);
     eprintln!("screen size {}x{}, arg {}", x_size, y_size, arg);
 
+    let mut rng = thread_rng();
+
     let t_frame = 0.040; // s
     let delay = Duration::new(0, (1_000_000_000.0 * t_frame) as u32);
 
@@ -56,7 +61,7 @@ fn main() -> std::io::Result<()> {
     let b = 27.0;
     let c = 8.0 / 3.0;
 
-    let mut x = 1.0;
+    let mut x = rng.gen::<f64>() - 0.5;
     let mut y = 0.0;
     let mut z = zc;