changes

src/world.rs

@@ -6,11 +6,18 @@ use crate::materials::EMPTY;
 
 const WIDTH: usize = 800;
 const HEIGHT: usize = 600;
+pub struct Change {
+    x_from: usize,
+    x_to: usize,
+    y_from: usize,
+    y_to: usize,
+}
 
 pub struct World {
     pub width: usize,
     pub height: usize,
     pub cells: Vec<Cell>,
+    changes: Vec<Change>,
 }
 impl World {
     pub fn new() -> Self {
@@ -25,6 +32,7 @@ impl World {
                 };
                 WIDTH * HEIGHT
             ],
+            changes: vec![],
         }
     }
 }
@@ -47,6 +55,20 @@ impl World {
     pub fn set_xy(&mut self, x: usize, y: usize, cell: Cell) {
         self.cells[xy_to_i(x, y)] = cell
     }
+
+    // Collect all the changes to the world and push them into a changes vec
+    pub fn move_cell(&mut self, x: usize, y: usize, xto: usize, yto: usize) {
+        let change = Change {
+            x_from: x,
+            x_to: xto,
+            y_from: y,
+            y_to: yto,
+        };
+
+        self.changes.push(change);
+    }
+    // Takes the changes to the world and applies them.
+    pub fn commit_cells() {}
 }
 
 pub fn in_bounds(x: usize, y: usize) -> bool {