make seperate struct for buffer

src/agent.rs

@@ -1,6 +1,6 @@
 use crate::{
-    grid::Grid,
     util::wrap,
+    buffer::Buf,
 };
 
 use rand::{seq::SliceRandom, Rng};
@@ -41,8 +41,9 @@ impl Agent {
         }
     }
 
+    // Tick an agent
     #[inline]
-    pub fn tick(&mut self, grid: &Grid, sensor_distance: f32, sensor_angle: f32, rotation_angle: f32, step_distance: f32, width: usize, height: usize) {
+    pub fn tick(&mut self, buf: &Buf, sensor_distance: f32, sensor_angle: f32, rotation_angle: f32, step_distance: f32, width: usize, height: usize) {
         let xc = self.x + cos(self.angle) * sensor_distance;
         let yc = self.y + sin(self.angle) * sensor_distance;
 
@@ -55,9 +56,9 @@ impl Agent {
         let yr = self.y + sin(agent_add_sens) * sensor_distance;
 
         // We sense from the buffer because this is where we previously combined data from all the grid.
-        let center = grid.get_buf(xc, yc);
-        let left = grid.get_buf(xl, yl);
-        let right = grid.get_buf(xr, yr);
+        let center = buf.get_buf(xc, yc);
+        let left = buf.get_buf(xl, yl);
+        let right = buf.get_buf(xr, yr);
 
         // Rotate and move logic
         let mut rng = rand::thread_rng();

src/buffer.rs

@@ -0,0 +1,39 @@
+#[derive(Debug)]
+pub struct Buf {
+    pub width: usize,
+    pub height: usize,
+    pub buf: Vec<f32>,
+}
+
+impl Clone for Buf {
+    fn clone(&self) -> Buf {
+        Buf {
+            width: self.width,
+            height: self.height,
+            buf: self.buf.clone(),
+        }
+    }
+}
+
+impl Buf {
+    pub fn new(width: usize, height: usize, buf: Vec<f32>) -> Self {
+        Buf {
+            width,
+            height,
+            buf,
+        }
+    }
+
+    // Truncate x and y and return a corresponding index into the data slice.
+    fn index(&self, x: f32, y: f32) -> usize {
+        // x/y can come in negative, hence we shift them by width/height.
+        let i = (x + self.width as f32) as usize & (self.width - 1);
+        let j = (y + self.height as f32) as usize & (self.height - 1);
+        j * self.width + i
+    }
+
+    // Get the buffer value at a given position. The implementation effectively treats data as periodic, hence any finite position will produce a value.
+    pub fn get_buf(&self, x: f32, y: f32) -> f32 {
+        self.buf[self.index(x, y)]
+    }
+}

src/grid.rs

@@ -1,6 +1,7 @@
 use crate::{
     blur::Blur,
     agent::Agent,
+    buffer::Buf,
 };
 
 use rand::{distributions::Uniform, Rng};
@@ -89,7 +90,8 @@ pub struct Grid {
     pub data: Vec<f32>,
 
     // Scratch space for the blur operation.
-    pub buf: Vec<f32>,
+    // pub buf: Vec<f32>,
+    pub buf: Buf,
     pub blur: Blur,
     pub agents: Vec<Agent>
 }
@@ -122,7 +124,7 @@ impl Grid {
             height,
             data,
             config: PopulationConfig::new(rng),
-            buf: vec![0.0; width * height],
+            buf: Buf::new(width, height, vec![0.0; width * height]),
             blur: Blur::new(width),
             agents,
         }
@@ -136,10 +138,12 @@ impl Grid {
         j * self.width + i
     }
 
+    /*
     // Get the buffer value at a given position. The implementation effectively treats data as periodic, hence any finite position will produce a value.
     pub fn get_buf(&self, x: f32, y: f32) -> f32 {
-        self.buf[self.index(x, y)]
+        self.buf.buf[self.index(x, y)]
     }
+    */
 
     // Add a value to the grid data at a given position.
     pub fn deposit(&mut self, x: f32, y: f32) {
@@ -151,7 +155,7 @@ impl Grid {
     pub fn diffuse(&mut self, radius: usize) {
         self.blur.run(
             &mut self.data,
-            &mut self.buf,
+            &mut self.buf.buf,
             self.width,
             self.height,
             radius as f32,
@@ -170,10 +174,10 @@ impl Grid {
             ..
         } = self.config;
 
-        let self_imut = self.clone(); // Create immutable copy of self before ticking agents (this is a very bad solution, needs to be improved)
+        let buf = self.buf.clone();
 
         self.agents.par_iter_mut().for_each(|agent| {
-            agent.tick(&self_imut, 
+            agent.tick(&buf, 
                 sensor_distance, sensor_angle, 
                 rotation_angle, step_distance,
                 width, height);
@@ -214,7 +218,7 @@ where
     T: AsRef<[f32]> + Sync,
 {
     let datas: Vec<_> = grids.iter().map(|grid| &grid.data).collect();
-    let bufs: Vec<_> = grids.iter().map(|grid| &grid.buf).collect();
+    let bufs: Vec<_> = grids.iter().map(|grid| &grid.buf.buf).collect();
 
     // We mutate grid buffers and read grid data. We use unsafe because we need shared/unique borrows on different fields of the same Grid struct.
     bufs.iter().enumerate().for_each(|(i, buf)| unsafe {

src/imgdata.rs

@@ -22,7 +22,7 @@ impl Clone for ThinGridData {
 
 impl ThinGridData {
     // Convert Grid to ThinGridData
-    pub fn from_grid(in_grid: &Grid) -> Self {
+    pub fn new_from_grid(in_grid: &Grid) -> Self {
         ThinGridData {
             width: in_grid.width,
             height: in_grid.height,
@@ -31,9 +31,9 @@ impl ThinGridData {
     }
 
     #[allow(dead_code)]
-    pub fn from_grid_vec(in_grids: Vec<Grid>) -> Vec<Self> {
+    pub fn new_from_grid_vec(in_grids: Vec<Grid>) -> Vec<Self> {
         return in_grids.iter().map(|grid|{
-            Self::from_grid(grid)
+            Self::new_from_grid(grid)
         }).collect();
     }
 

src/lib.rs

@@ -5,3 +5,4 @@ pub mod model;
 mod palette;
 mod util; // for math things
 mod agent;
+mod buffer;

src/model.rs

@@ -165,14 +165,8 @@ impl Model {
         );
     }
 
-    fn strip_grid_data(grids: Vec<Grid>) -> Vec<ThinGridData> {
-        return grids.iter().map(|grid| {
-            ThinGridData::from_grid(grid)
-        }).collect();
-    }
-
     fn save_image_data(&mut self) {
-        let grids = Self::strip_grid_data(self.grids.clone());
+        let grids = ThinGridData::new_from_grid_vec(self.grids.clone());
         let img_data = ImgData::new(grids, self.palette, self.iteration);
         self.img_data_vec.push(img_data);
         if self.grids[0].width > 1024 && self.grids[0].height > 1024 && self.img_data_vec.len() > 100 {