Implement own simple dot export for OpticScenery

examples/opticscenery.rs

@@ -4,7 +4,8 @@ use std::io::Write;
 
 fn main() {
     println!("opticscenery example");
-    let scenery = OpticScenery::default();
+    let mut scenery = OpticScenery::default();
+    scenery.set_description("OpticScenery demo".into());
     println!("default opticscenery: {:?}", scenery);
     println!("export to `dot` format: {}", scenery.to_dot());
     let path = "graph.dot";

src/optic_scenery.rs

 use crate::optic_node::OpticNode;
-use petgraph::dot::Dot;
 use petgraph::prelude::{DiGraph, NodeIndex};
 
 /// Opticscenery represents the overall optical model and additional metatdata. All optical elements (OpticNodes) have to be added to this
@@ -24,7 +23,10 @@ impl OpticScenery {
     }
     /// Export the optic graph into the `dot` format to be used in combination with the [`graphviz`](https://graphviz.org/) software.
     pub fn to_dot(&self) -> String {
-        format!("{:?}", Dot::new(&self.g))
+        let mut dot_string="digraph {\n".to_owned();
+        dot_string.push_str(&format!("  label=\"{}\"\n", self.description));
+        dot_string+="}";
+        dot_string
     }
     /// Analyze this [`OpticScenery`] using a given OpticAnalyzer.
     pub fn analyze(&self) {