restructuring

src/grid.rs

@@ -1,6 +1,6 @@
 use crate::{
     blur::Blur,
-    model::Agent,
+    agent::Agent,
 };
 
 use rand::{distributions::Uniform, Rng};
@@ -86,11 +86,11 @@ pub struct Grid {
     pub width: usize,
     pub height: usize,
 
-    data: Vec<f32>,
+    pub data: Vec<f32>,
 
     // Scratch space for the blur operation.
-    buf: Vec<f32>,
-    blur: Blur,
+    pub buf: Vec<f32>,
+    pub blur: Blur,
     pub agents: Vec<Agent>
 }