diff --git a/src/sprite_atlas.clj b/src/sprite_atlas.clj
index 7e3102d..b466fce 100644
--- a/src/sprite_atlas.clj
+++ b/src/sprite_atlas.clj
@@ -4,26 +4,45 @@
    [engine]
    [rl :as rl]))
 
+(def screen-width 1250)
+(def screen-height 780)
+
 (defonce state (atom {}))
 
+;; (defn tile-source [game]
+;;   {:x
+;;    :y
+;;    :width
+;;    :height
+;;    :name })
+
 (defn init-sprite-atlas [config]
   (let [path (:sprite-path @state)]
-    (if (.exists (io/file path))
-      {:atlas (rl/load-texture path)}
-      {})))
+    (-> (if (.exists (io/file path))
+          {:atlas (rl/load-texture path)}
+          {})
+        (assoc :zoom 1))))
+
+(defn- auto-tile [game cell-size cell-count]
+  (assoc game :auto-tile-info {:cell-size 16 :cell-count 11}))
 
 (defn handle-sprite-atlas-input [_ game]
-  (cond-> game
-    (rl/mouse-button-pressed? rl/mouse-button-left)
-    (assoc :drag-start (rl/get-mouse-position))
+  (let [game (cond-> game
+               (rl/mouse-button-pressed? rl/mouse-button-left)
+               (assoc :drag-start (rl/get-mouse-position))
 
-    (rl/mouse-button-released? rl/mouse-button-left)
-    (assoc :event-drag-ended true)
+               (rl/mouse-button-released? rl/mouse-button-left)
+               (assoc :event-drag-ended true)
 
-    :always
-    (as-> g (cond-> g
-              (contains? g :drag-start)
-              (assoc :current-mouse-pos (rl/get-mouse-position))))))
+               :always
+               (as-> g (cond-> g
+                         (contains? g :drag-start)
+                         (assoc :current-mouse-pos (rl/get-mouse-position)))))
+        move (rl/get-mouse-wheel-move)
+        game (cond-> game
+               (not (zero? move))
+               (update :zoom #(+ % move)))]
+    game))
 
 (defn- get-selection-rect [{ax :x ay :y} {bx :x by :y}]
   (let [start-x (min ax bx)
@@ -38,23 +57,33 @@
     (-> (assoc :selected-sprite (get-selection-rect (:drag-start game) (:current-mouse-pos game)))
         (dissoc :event-drag-ended :drag-start :current-mouse-pos))))
 
-(defn draw-sprite-atlas [_ {:keys [atlas drag-start current-mouse-pos selected-sprite]}]
+(defn draw-sprite-atlas [_ {:keys [atlas zoom drag-start current-mouse-pos selected-sprite auto-tile-info]}]
   (rl/clear-background!* rl/black)
-  (when atlas
-    (rl/draw-texture!* (:seg atlas) 0 0 rl/white)
-    (when drag-start
-      (let [start-x (:x drag-start)
-            start-y (:y drag-start)
-            end-x (:x current-mouse-pos)
-            end-y (:y current-mouse-pos)]
-        (rl/draw-rectangle-lines!* start-x start-y (- end-x start-x) (- end-y start-y) rl/white)))
-    (when selected-sprite
-      (let [{:keys [x y w h]} selected-sprite]
-        (rl/draw-texture-rec!* (:seg atlas) (rl/rect-seg x y w h) (rl/vec2-seg 30 30) rl/white)))
-    (rl/draw-fps 10 10)))
+  (let [current-scale (* (/ screen-height (:height atlas)) (max 0.1 (* zoom 0.1)))]
+    (when atlas
+      (rl/draw-texture-ex!* (:seg atlas) (rl/vec2-seg 0 0) 0.0 current-scale rl/white)
+      (when drag-start
+        (let [start-x (:x drag-start)
+              start-y (:y drag-start)
+              end-x (:x current-mouse-pos)
+              end-y (:y current-mouse-pos)]
+          (rl/draw-rectangle-lines!* start-x start-y (- end-x start-x) (- end-y start-y) rl/white)))
+      #_(when selected-sprite
+        (let [{:keys [x y w h]} selected-sprite]
+          (rl/draw-texture-rec!* (:seg atlas) (rl/rect-seg x y w h) (rl/vec2-seg 30 30) rl/white)))
+      (let [cell-size 16
+            rows 11
+            cols 12]
+        (doseq [row (range rows)
+                col (range cols)]
+          (rl/draw-rectangle-lines!* (* col cell-size current-scale)
+                                     (* row cell-size current-scale)
+                                     (* cell-size current-scale)
+                                     (* cell-size current-scale)
+                                     rl/gray))))))
 
 (defn watch-sprite-atlas [config game]
-  {})
+  {:zoom (:zoom game)})
 
 (defn unload-sprite-atlas [game]
   (rl/unload-texture! (:atlas game)))
@@ -63,8 +92,8 @@
   (swap! state assoc :sprite-path (first sprite-path))
   (engine/run-game!
    {:title       "Sprite Atlas"
-    :width       1280
-    :height      900
+    :width       screen-width
+    :height      screen-height
     :init        #'init-sprite-atlas
     :input       #'handle-sprite-atlas-input
     :update      #'update-sprite-atlas
@@ -73,5 +102,5 @@
     :watch-fn    #'watch-sprite-atlas}))
 
 (comment
-  (future (-main "./source-assets/thai_village.png"))
+  (future (-main "source-assets/Sprout Lands - Sprites - premium pack/Sprout Lands - Sprites - premium pack/Tilesets/ground tiles/New tiles/Grass_tiles_v2.png"))
   :-)