Add image output

examples/layout.rs

@@ -1,7 +1,7 @@
 use clap::Parser;
 use factorio_blueprint::{
     common::visualize::Visualize,
-    layout::{genetic_algorithm2, GeneticAlgorithm, PathLayout},
+    layout::{genetic_algorithm2, PathLayout},
 };
 use rand::{rngs::SmallRng, SeedableRng};
 
@@ -36,6 +36,7 @@ fn main() {
         let g = genetic_algorithm2(&p, 10, 320, &mut rng);
 
         g.print_visualization();
+        g.png_visualization("test.png");
         if m.as_ref().is_none_or(|m| g.score() < m.score()) {
             m = Some(g);
         }

examples/solve_belt.rs

@@ -1,6 +1,6 @@
 use clap::{Parser, ValueEnum};
 use factorio_blueprint::belt_finding::{conflict_avoidance::ConflictAvoidance, problems, Problem};
-use std::{io, path::PathBuf};
+use std::io;
 
 #[derive(ValueEnum, Clone)]
 enum Mode {