Circles and spirals in mind

Cargo.lock

@@ -2,6 +2,147 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "cfg-if"
+version = "1.0.4"
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+
 [[package]]
 name = "fapprox"
 version = "0.1.0"
+dependencies = [
+ "rand",
+]
+
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+name = "getrandom"
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+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasip2",
+]
+
+[[package]]
+name = "libc"
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+
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+ "zerocopy",
+]
+
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+]
+
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+ "rand_core",
+]
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+]
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+ "wit-bindgen",
+]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]

Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+rand = "0.9.2"

src/node/graph_modifier.rs

@@ -1,12 +0,0 @@
-use crate::node::Node;
-
-pub struct GraphModifier<'a> {
-    root: &'a Node,
-}
-
-impl<'a> GraphModifier<'a> {
-    pub fn new(root: &Node) -> GraphModifier {
-        GraphModifier { root }
-    }
-    
-}

src/node/mod.rs

@@ -1,6 +1,6 @@
-use crate::node::graph_modifier::GraphModifier;
+use crate::node::node_modifier::NodeModifier;
 
-mod graph_modifier;
+mod node_modifier;
 
 pub struct Node {
     children: Vec<Node>,
@@ -31,7 +31,7 @@ impl Node {
 
         return (self.function)(inputs);
     }
-    pub fn modify_tree(&self) -> GraphModifier {
+    pub fn modify_tree<'a>(&'a mut self) -> NodeModifier<'a> {
-        GraphModifier::new(self)
+        NodeModifier::from_random(self)
     }
 }

src/node/node_modifier.rs

@@ -0,0 +1,24 @@
+use crate::node::Node;
+use rand::random_range;
+
+const PICK_STOP_PROBABILITY: u8 = 2;
+
+pub struct NodeModifier<'a> {
+    picked_node: &'a mut Node,
+}
+
+impl<'a> NodeModifier<'a> {
+    pub fn from_random(root: &'a mut Node) -> NodeModifier<'a> {
+        let mut selected = root;
+        while random_range(0..PICK_STOP_PROBABILITY) == PICK_STOP_PROBABILITY - 1 {
+            let len = selected.children.len();
+            selected = &mut selected.children[random_range(0..len)];
+        }
+        NodeModifier {
+            picked_node: selected,
+        }
+    }
+    pub fn from_node(node: &'a mut Node) -> NodeModifier<'a> {
+        NodeModifier { picked_node: node }
+    }
+}