From 1a515237afb7ad09353a65f5fbc6e98a7c29ce8e Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sat, 22 Aug 2026 15:00:35 -0700
Subject: sim manager refactor

---
 src/sim/rb_manager/rb_entity.rs | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 src/sim/rb_manager/rb_entity.rs

(limited to 'src/sim/rb_manager/rb_entity.rs')

diff --git a/src/sim/rb_manager/rb_entity.rs b/src/sim/rb_manager/rb_entity.rs
new file mode 100644
index 0000000..18a6693
--- /dev/null
+++ b/src/sim/rb_manager/rb_entity.rs
@@ -0,0 +1,39 @@
+use rapier2d::prelude;
+
+use crate::sim::{
+    cell::{cell::Cell, materials::MaterialId},
+    lib::marching_squares::Marchable,
+};
+
+pub struct RbEntity {
+    pub id: u32,
+    pub width: i32,
+    pub height: i32,
+    pub cells: Vec<Cell>,
+    pub rb: prelude::RigidBodyHandle,
+    pub collider: Option<prelude::ColliderHandle>,
+}
+
+impl RbEntity {
+    #[inline]
+    pub fn get_cell_at_local_position(&self, x: u8, y: u8) -> Cell {
+        self.cells[x as usize + y as usize * self.width as usize]
+    }
+    #[inline]
+    pub fn set_cell_at_local_position(&mut self, x: u8, y: u8, cell: Cell) {
+        self.cells[x as usize + y as usize * self.width as usize] = cell;
+    }
+}
+
+impl Marchable for RbEntity {
+    fn occupied(&self, x: i32, y: i32) -> bool {
+        if x < 0 || x >= self.width || y < 0 || y >= self.height {
+            false
+        } else {
+            self.get_cell_at_local_position(x as u8, y as u8).material != MaterialId::Void
+        }
+    }
+    fn size(&self) -> (i32, i32) {
+        (self.width, self.height)
+    }
+}
-- 
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