diff --git a/src/engine.rs b/src/engine.rs
index c29f59b..b102913 100644
--- a/src/engine.rs
+++ b/src/engine.rs
@@ -1,10 +1,13 @@
-use self::objs::{obj_traits::MovingObject, World};
+const GAME_SIZE: (u32, u32) = (1200, 800);
 use std::{
+    collections::HashMap,
     num::NonZeroU32,
     process,
     rc::Rc,
     time::{Duration, Instant},
 };
+
+use softbuffer::Buffer;
 use winit::{
     dpi::PhysicalSize,
     event::{Event, KeyEvent, StartCause, WindowEvent},
@@ -14,16 +17,9 @@ use winit::{
     window::WindowBuilder,
 };
 
-pub mod objs;
-mod render;
-mod timer;
+use self::objs::{MovingObject, World};
 
-const GAME_SIZE: (u32, u32) = (1200, 800);
-const BORDER_WIDTH: u32 = 10;
-const FG: u32 = 0xebdbb2;
-const BG: u32 = 0x282828;
-
-type RenderFn = fn(&mut render::RenderCtx<'_, '_>, &mut World, &timer::GameTimer);
+type RenderFn = fn(&mut render::RenderCtx<'_, '_>, &mut World, &GameTimer);
 // core game engine struct
 pub struct Engine {
     event_loop: EventLoop<()>,
@@ -71,7 +67,7 @@ impl Engine {
         let mut surface =
             softbuffer::Surface::new(&context, window.window_handle().unwrap()).unwrap();
 
-        let mut timer = timer::GameTimer::new();
+        let mut timer = GameTimer::new();
 
         event_loop
             .run(|event, elwt| {
@@ -85,44 +81,6 @@ impl Engine {
                     Event::NewEvents(StartCause::ResumeTimeReached { .. }) => {
                         window.request_redraw();
                     }
-                    Event::WindowEvent {
-                        window_id,
-                        event: WindowEvent::Resized(PhysicalSize { width, height }),
-                    } => {
-                        if window_id == window.id() {
-                            if let (Some(width), Some(height)) =
-                                (NonZeroU32::new(width), NonZeroU32::new(height))
-                            {
-                                surface.resize(width, height).unwrap();
-                                let mut buffer = surface.buffer_mut().unwrap();
-                                buffer.fill(BG);
-
-                                let mut ctx =
-                                    render::RenderCtx::new(buffer, (width, height), GAME_SIZE);
-
-                                // top
-                                ctx.rect(0, 0, GAME_SIZE.0, BORDER_WIDTH, FG);
-                                // left
-                                ctx.rect(
-                                    0,
-                                    BORDER_WIDTH,
-                                    BORDER_WIDTH,
-                                    GAME_SIZE.1 - BORDER_WIDTH * 2,
-                                    FG,
-                                );
-                                // right
-                                ctx.rect(
-                                    GAME_SIZE.0 - BORDER_WIDTH,
-                                    BORDER_WIDTH,
-                                    BORDER_WIDTH,
-                                    GAME_SIZE.1 - BORDER_WIDTH * 2,
-                                    FG,
-                                );
-                                // bottom
-                                ctx.rect(0, GAME_SIZE.1 - BORDER_WIDTH, GAME_SIZE.0, 10, FG);
-                            }
-                        }
-                    }
                     Event::WindowEvent {
                         window_id,
                         event: WindowEvent::RedrawRequested,
@@ -133,7 +91,7 @@ impl Engine {
                                 (NonZeroU32::new(size.width), NonZeroU32::new(size.height))
                             } {
                                 surface.resize(width, height).unwrap();
-                                let buffer = surface.buffer_mut().unwrap();
+                                let mut buffer = surface.buffer_mut().unwrap();
 
                                 let mut ctx =
                                     render::RenderCtx::new(buffer, (width, height), GAME_SIZE);
@@ -176,3 +134,216 @@ impl Engine {
         process::exit(0);
     }
 }
+
+pub struct GameTimer {
+    game_start: Instant,
+    last_frame: Instant,
+    stopwatches: HashMap<String, Instant>,
+}
+
+impl GameTimer {
+    pub fn new() -> Self {
+        Self {
+            game_start: Instant::now(),
+            last_frame: Instant::now(),
+            stopwatches: HashMap::new(),
+        }
+    }
+
+    pub fn frame_update(&mut self) {
+        self.last_frame = Instant::now()
+    }
+
+    pub fn delta_t(&self) -> f32 {
+        Instant::now().duration_since(self.last_frame).as_secs_f32()
+    }
+
+    pub fn game_time_passed(&self) -> f32 {
+        Instant::now().duration_since(self.game_start).as_secs_f32()
+    }
+
+    pub fn start_stopwatch(&mut self, name: impl ToString) {
+        let _ = self.stopwatches.insert(name.to_string(), Instant::now());
+    }
+
+    pub fn get_stopwatch_time(&self, name: &str) -> Option<f32> {
+        self.stopwatches
+            .get(name)
+            .map(|start_time| Instant::now().duration_since(*start_time).as_secs_f32())
+    }
+
+    pub fn delete_stopwatch(&mut self, name: &str) {
+        let _ = self.stopwatches.remove(name);
+    }
+}
+
+mod render;
+
+pub mod objs {
+    use std::rc::Rc;
+
+    use super::render::RenderCtx;
+
+    pub struct World {
+        objects: Vec<Rc<dyn MovingObject>>,
+    }
+
+    impl World {
+        pub fn new() -> Self {
+            Self {
+                objects: Vec::new(),
+            }
+        }
+
+        pub fn insert(&mut self, obj: Rc<dyn MovingObject>) -> usize {
+            self.objects.push(obj);
+            self.objects.len() - 1
+        }
+
+        pub fn get(&self, i: usize) -> Rc<dyn MovingObject> {
+            self.objects[i].clone()
+        }
+
+        pub fn get_mut(&mut self, i: usize) -> &mut Rc<dyn MovingObject> {
+            &mut self.objects[i]
+        }
+
+        pub fn draw_all(&self, ctx: &mut RenderCtx<'_, '_>) {
+            self.objects.iter().for_each(|obj| obj.display(ctx))
+        }
+    }
+
+    #[derive(Clone, Copy, Debug, Eq, PartialEq)]
+    pub struct Rect {
+        pos: Position,
+        size: Size,
+    }
+
+    impl Rect {
+        pub fn new(x: u32, y: u32, height: u32, width: u32) -> Self {
+            Self {
+                pos: Position::new(x, y),
+                size: Size::new(width, height),
+            }
+        }
+
+        pub fn square(x: u32, y: u32, size: u32) -> Self {
+            Self {
+                pos: Position::new(x, y),
+                size: Size::new(size, size),
+            }
+        }
+    }
+
+    impl Object for Rect {
+        fn position(&self) -> Position {
+            self.pos
+        }
+
+        fn size(&self) -> Size {
+            self.size
+        }
+    }
+
+    #[derive(Clone, Copy, Debug, Eq, PartialEq)]
+    pub struct MovingRect {
+        prev_pos: Position,
+        current: Rect,
+    }
+
+    impl MovingRect {
+        pub fn new(x: u32, y: u32, height: u32, width: u32) -> Self {
+            Self {
+                prev_pos: Position::new(x, y),
+                current: Rect::new(x, y, height, width),
+            }
+        }
+
+        pub fn square(x: u32, y: u32, size: u32) -> Self {
+            Self {
+                prev_pos: Position::new(x, y),
+                current: Rect::square(x, y, size),
+            }
+        }
+    }
+
+    impl Object for MovingRect {
+        fn position(&self) -> Position {
+            self.current.position()
+        }
+
+        fn size(&self) -> Size {
+            self.current.size()
+        }
+    }
+
+    impl MovingObject for MovingRect {
+        fn previous_pos(&self) -> Position {
+            self.prev_pos
+        }
+
+        fn update_pos(&mut self, x: u32, y: u32) {
+            self.prev_pos = self.current.pos;
+            self.current.pos = Position::new(x, y);
+        }
+    }
+
+    #[derive(Clone, Copy, Debug, Eq, PartialEq)]
+    pub struct Position {
+        x: u32,
+        y: u32,
+    }
+
+    impl Position {
+        pub fn new(x: u32, y: u32) -> Self {
+            Self { x, y }
+        }
+    }
+
+    #[derive(Clone, Copy, Debug, Eq, PartialEq)]
+    pub struct Size {
+        width: u32,
+        height: u32,
+    }
+
+    impl Size {
+        pub fn new(width: u32, height: u32) -> Self {
+            Self { width, height }
+        }
+    }
+
+    pub trait Object {
+        fn position(&self) -> Position;
+        fn size(&self) -> Size;
+        fn display(&self, ctx: &mut RenderCtx<'_, '_>) {
+            let Position { x, y } = self.position();
+            let Size { width, height } = self.size();
+            ctx.rect(x, y, width, height, 0xffffff);
+        }
+    }
+
+    pub trait MovingObject: Object {
+        fn previous_pos(&self) -> Position;
+        fn update_pos(&mut self, x: u32, y: u32);
+        fn move_obj(&mut self, x: i32, y: i32) {
+            let Position { x: cur_x, y: cur_y } = self.position();
+
+            self.update_pos(
+                cur_x.saturating_add_signed(x),
+                cur_y.saturating_add_signed(y),
+            )
+        }
+
+        // TODO: damage
+        fn draw_move(&self, ctx: &mut RenderCtx<'_, '_>) {
+            let Position {
+                x: prev_x,
+                y: prev_y,
+            } = self.previous_pos();
+            let Size { width, height } = self.size();
+
+            ctx.rect(prev_x, prev_y, width, height, 0x000000);
+            self.display(ctx);
+        }
+    }
+}
diff --git a/src/engine/objs.rs b/src/engine/objs.rs
deleted file mode 100644
index 3199951..0000000
--- a/src/engine/objs.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-use std::rc::Rc;
-
-use self::obj_traits::MovingObject;
-
-use super::{render::RenderCtx, BG, FG};
-
-pub mod geometry;
-pub mod obj_traits;
-pub mod primitive_shapes;
-
-pub struct World {
-    objects: Vec<Rc<dyn MovingObject>>,
-}
-
-impl World {
-    pub fn new() -> Self {
-        Self {
-            objects: Vec::new(),
-        }
-    }
-
-    pub fn insert(&mut self, obj: Rc<dyn MovingObject>) -> usize {
-        self.objects.push(obj);
-        self.objects.len() - 1
-    }
-
-    pub fn get(&self, i: usize) -> Rc<dyn MovingObject> {
-        self.objects[i].clone()
-    }
-
-    pub fn get_mut(&mut self, i: usize) -> &mut Rc<dyn MovingObject> {
-        &mut self.objects[i]
-    }
-
-    pub fn draw_all(&self, ctx: &mut RenderCtx<'_, '_>) {
-        self.objects.iter().for_each(|obj| obj.display(ctx))
-    }
-}
diff --git a/src/engine/objs/geometry.rs b/src/engine/objs/geometry.rs
deleted file mode 100644
index 9766c6a..0000000
--- a/src/engine/objs/geometry.rs
+++ /dev/null
@@ -1,22 +0,0 @@
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub struct Position {
-    pub x: u32,
-    pub y: u32,
-}
-
-impl Position {
-    pub fn new(x: u32, y: u32) -> Self {
-        Self { x, y }
-    }
-}
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub struct Size {
-    pub width: u32,
-    pub height: u32,
-}
-impl Size {
-    pub fn new(width: u32, height: u32) -> Self {
-        Self { width, height }
-    }
-}
diff --git a/src/engine/objs/obj_traits.rs b/src/engine/objs/obj_traits.rs
deleted file mode 100644
index dabd454..0000000
--- a/src/engine/objs/obj_traits.rs
+++ /dev/null
@@ -1,38 +0,0 @@
-use crate::engine::{render::RenderCtx, BG, FG};
-
-use super::geometry::{Position, Size};
-
-pub trait Object {
-    fn position(&self) -> Position;
-    fn size(&self) -> Size;
-    fn display(&self, ctx: &mut RenderCtx<'_, '_>) {
-        let Position { x, y } = self.position();
-        let Size { width, height } = self.size();
-        ctx.rect(x, y, width, height, FG);
-    }
-}
-
-pub trait MovingObject: Object {
-    fn previous_pos(&self) -> Position;
-    fn update_pos(&mut self, x: u32, y: u32);
-    fn move_obj(&mut self, x: i32, y: i32) {
-        let Position { x: cur_x, y: cur_y } = self.position();
-
-        self.update_pos(
-            cur_x.saturating_add_signed(x),
-            cur_y.saturating_add_signed(y),
-        )
-    }
-
-    // TODO: damage
-    fn draw_move(&self, ctx: &mut RenderCtx<'_, '_>) {
-        let Position {
-            x: prev_x,
-            y: prev_y,
-        } = self.previous_pos();
-        let Size { width, height } = self.size();
-
-        ctx.rect(prev_x, prev_y, width, height, BG);
-        self.display(ctx);
-    }
-}
diff --git a/src/engine/objs/primitive_shapes.rs b/src/engine/objs/primitive_shapes.rs
deleted file mode 100644
index 32c1748..0000000
--- a/src/engine/objs/primitive_shapes.rs
+++ /dev/null
@@ -1,79 +0,0 @@
-use super::{
-    geometry::{Position, Size},
-    obj_traits::{MovingObject, Object},
-};
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub struct Rect {
-    pos: Position,
-    size: Size,
-}
-
-impl Rect {
-    pub fn new(x: u32, y: u32, height: u32, width: u32) -> Self {
-        Self {
-            pos: Position::new(x, y),
-            size: Size::new(width, height),
-        }
-    }
-
-    pub fn square(x: u32, y: u32, size: u32) -> Self {
-        Self {
-            pos: Position::new(x, y),
-            size: Size::new(size, size),
-        }
-    }
-}
-
-impl Object for Rect {
-    fn position(&self) -> Position {
-        self.pos
-    }
-
-    fn size(&self) -> Size {
-        self.size
-    }
-}
-
-#[derive(Clone, Copy, Debug, Eq, PartialEq)]
-pub struct MovingRect {
-    prev_pos: Position,
-    current: Rect,
-}
-
-impl MovingRect {
-    pub fn new(x: u32, y: u32, height: u32, width: u32) -> Self {
-        Self {
-            prev_pos: Position::new(x, y),
-            current: Rect::new(x, y, height, width),
-        }
-    }
-
-    pub fn square(x: u32, y: u32, size: u32) -> Self {
-        Self {
-            prev_pos: Position::new(x, y),
-            current: Rect::square(x, y, size),
-        }
-    }
-}
-
-impl Object for MovingRect {
-    fn position(&self) -> Position {
-        self.current.position()
-    }
-
-    fn size(&self) -> Size {
-        self.current.size()
-    }
-}
-
-impl MovingObject for MovingRect {
-    fn previous_pos(&self) -> Position {
-        self.prev_pos
-    }
-
-    fn update_pos(&mut self, x: u32, y: u32) {
-        self.prev_pos = self.current.pos;
-        self.current.pos = Position::new(x, y);
-    }
-}
diff --git a/src/engine/render.rs b/src/engine/render.rs
index a0b4492..2f62bf6 100644
--- a/src/engine/render.rs
+++ b/src/engine/render.rs
@@ -6,6 +6,8 @@ use winit::raw_window_handle::DisplayHandle;
 
 use softbuffer::Buffer;
 
+use super::objs::Object;
+
 // render context
 pub struct RenderCtx<'buf, 'win> {
     pub(crate) buffer: Buffer<'buf, DisplayHandle<'win>, WindowHandle<'win>>,
@@ -56,9 +58,6 @@ impl<'buf, 'win> RenderCtx<'buf, 'win> {
         }
     }
 
-    /// draw a rectangle in a context
-    ///
-    /// this method limits overflows etc
     pub fn rect(&mut self, x: u32, y: u32, width: u32, height: u32, color: u32) {
         if x >= self.context_size.0 || y >= self.context_size.1 || width == 0 || height == 0 {
         } else {
diff --git a/src/engine/timer.rs b/src/engine/timer.rs
deleted file mode 100644
index 46dbf98..0000000
--- a/src/engine/timer.rs
+++ /dev/null
@@ -1,45 +0,0 @@
-use std::collections::HashMap;
-
-use std::time::Instant;
-
-pub struct GameTimer {
-    pub(crate) game_start: Instant,
-    pub(crate) last_frame: Instant,
-    pub(crate) stopwatches: HashMap<String, Instant>,
-}
-
-impl GameTimer {
-    pub fn new() -> Self {
-        Self {
-            game_start: Instant::now(),
-            last_frame: Instant::now(),
-            stopwatches: HashMap::new(),
-        }
-    }
-
-    pub fn frame_update(&mut self) {
-        self.last_frame = Instant::now()
-    }
-
-    pub fn delta_t(&self) -> f32 {
-        Instant::now().duration_since(self.last_frame).as_secs_f32()
-    }
-
-    pub fn game_time_passed(&self) -> f32 {
-        Instant::now().duration_since(self.game_start).as_secs_f32()
-    }
-
-    pub fn start_stopwatch(&mut self, name: impl ToString) {
-        let _ = self.stopwatches.insert(name.to_string(), Instant::now());
-    }
-
-    pub fn get_stopwatch_time(&self, name: &str) -> Option<f32> {
-        self.stopwatches
-            .get(name)
-            .map(|start_time| Instant::now().duration_since(*start_time).as_secs_f32())
-    }
-
-    pub fn delete_stopwatch(&mut self, name: &str) {
-        let _ = self.stopwatches.remove(name);
-    }
-}
diff --git a/src/main.rs b/src/main.rs
index 1e11bf1..7cb82eb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,16 +1,19 @@
 use std::rc::Rc;
 
-use engine::Engine;
+use engine::{
+    objs::{MovingRect, Object, Rect},
+    Engine,
+};
 
 fn main() {
     let mut engine = Engine::new();
-    // let _ = engine.insert_into_world(Rc::new(MovingRect::new(0, 0, 50, 100)));
+    let _ = engine.insert_into_world(Rc::new(MovingRect::new(0, 0, 50, 100)));
     engine
         .set_render_fn(|ctx, world, timer| {
-            // println!("t: {}", timer.game_time_passed());
-            // let obj = Rc::get_mut(world.get_mut(0)).unwrap();
-            // obj.move_obj(1, 0);
-            // obj.draw_move(ctx)
+            println!("t: {}", timer.game_time_passed());
+            let obj = Rc::get_mut(world.get_mut(0)).unwrap();
+            obj.move_obj(1, 0);
+            obj.draw_move(ctx)
             // Rect::square((timer.game_time_passed() * 20.) as u32, 0, 200).display(ctx);
         })
         .run();