Fixed zooming issue with camera and ensured producers produce at least one.

main.rb

@@ -22,10 +22,10 @@ GAME_PRODUCER_BASE_SPEED = 1
 
 # Camera settings
 CAMERA_MOVE_RANGE = 10
-CAMERA_MOVE_SPEED = 30
+CAMERA_MOVE_SPEED = 1
 CAMERA_MOVE_MAX_SPEED = (CAMERA_MOVE_RANGE * CAMERA_MOVE_SPEED / 2).to_i
-CAMERA_MIN_ZOOM = 0.3
-CAMERA_MAX_ZOOM = 20
+CAMERA_MIN_ZOOM = 0.7
+CAMERA_MAX_ZOOM = 5
 
 class NumFactory < Gosu::Window
   def initialize
@@ -104,8 +104,20 @@ class NumFactory < Gosu::Window
       close
     elsif id == Gosu::MS_WHEEL_UP
       @camera_zoom *= 1.1
+      if @camera_zoom > CAMERA_MAX_ZOOM
+        @camera_zoom = CAMERA_MAX_ZOOM
+      else
+        @camera_x *= 1.0125
+        @camera_y *= 1.0125
+      end
     elsif id == Gosu::MS_WHEEL_DOWN
       @camera_zoom *= 0.9
+      if @camera_zoom < CAMERA_MIN_ZOOM
+        @camera_zoom = CAMERA_MIN_ZOOM
+      else
+        @camera_x *= 0.985
+        @camera_y *= 0.985
+      end
     elsif id == Gosu::KB_SPACE
       @camera_zoom = 1.0
     else