Initial work on rollback and refactor

src/stage/debug.rs

@@ -0,0 +1,16 @@
+use bevy::{color::palettes::css::RED, prelude::*};
+
+use crate::stage::StageLine;
+
+pub fn debug_draw_scene(mut gizmos: Gizmos, planes: Query<&StageLine>) {
+    for plane in planes {
+        let from = plane.segment.point1();
+        let to = plane.segment.point2();
+        let from_3d = Vec3::new(from.x, from.y, 0.0);
+        let end_3d = Vec3::new(to.x, to.y, 0.0);
+        let normal_3d = Vec3::new(plane.normal.x, plane.normal.y, 0.0);
+        gizmos.line(from_3d, end_3d, RED);
+        let midpoint = (from_3d + end_3d) * 0.5;
+        gizmos.arrow(midpoint, midpoint + normal_3d, RED);
+    }
+}