some upgrades

modules/update_callback.lua

@@ -1,7 +1,8 @@
 local game = {}
-
-local function updateinit(gamex)
+local camera = {}
+local function updateinit(gamex, camerax)
     game = gamex
+    camera = camerax
 end
 
 local function update(dt)
@@ -48,8 +49,13 @@ local function update(dt)
             --revive player
             player.spritesheets["player_die"]:setFrame(1)
             player:revive(dt)
+        end
+        if key("x") then
+            print("x: \""..player.x.."\"; y: \""..player.y.."\"")
         end     
     end
+    local dx,dy = (player.x - camera.x) / 2, (player.y - camera.y) / 2
+    camera:move(dx, dy)
 end
 return {
     update = update,