Fixed coordinate system and finally got zoom working (#1)

Reviewed-on: nathan/number_factory#1
Co-authored-by: bionickatana <nathan@hintonclan.org>
Co-committed-by: bionickatana <nathan@hintonclan.org>

producer.rb

@@ -2,22 +2,26 @@
 ## A number producer that will create numbers when an extractor is placed on it.
 
 PRODUCER_DEBUG = false
+BORDER = 2
 
 class Producer
-  attr_reader :x, :y
+  attr_reader :draw_x, :draw_y
   # Create producer at a position with the number and rate specified
   # @param x [Integer] X position to start at
   # @param y [Integer] Y position to start at
   # @param number [Integer] The number to produce
   # @param rate [Integer] The speed in numbers per second to produce
-  def initialize(x, y, number, rate)
+  def initialize(x, y, number, rate, box_size, screen_width, screen_height)
     @x = x
     @y = y
     @number = [number, 1].max
     @rate = (30/rate).to_i
-    @image = Gosu.render(30, 30) {
+    @box_size = box_size
+    @screen_width = screen_width
+    @screen_height = screen_height
+    @image = Gosu.render(@box_size - (2 * BORDER), @box_size - (2 * BORDER)) {
       # Render the item
-      Gosu.draw_rect(0, 0, 30, 30, Gosu::Color::RED, 0)
+      Gosu.draw_rect(0, 0, @box_size - (2 * BORDER), @box_size - (2 * BORDER), Gosu::Color::RED, 0)
       Gosu::Image.from_text("#{@number}", 20).draw(5, 5, 1)
     }
 
@@ -27,18 +31,21 @@ class Producer
   # game is 30 fps so we use that for a counter
   
   # @param delta_mult [Float] The delta multiplier for any actions
-  def update(delta_mult)
+  # @param camera_x [Integer] The camera X position
+  # @param camera_y [Integer] The camera Y position
+  # @param camera_zoom [Float] The camera zoom
+  def update(delta_mult, camera_x, camera_y, camera_zoom)
+    @draw_x = (((((@screen_width / @box_size.to_f) / 2.0) + (@x - camera_x) * camera_zoom) * @box_size) + BORDER * camera_zoom)
+    @draw_y = (((((@screen_height / @box_size.to_f) / 2.0) + (@y - camera_y) * camera_zoom) * @box_size) + BORDER * camera_zoom)
+    @camera_zoom = camera_zoom
     
   end
 
   # Draw the producer. Uses the camera x and y to shift where it should draw
-  # @param camera_x [Integer] The camera X position
-  # @param camera_y [Integer] The camera Y position
-  # @param camera_zoom [Float] The camera zoom
-  def draw(camera_x, camera_y, camera_zoom)
+  def draw()
     if PRODUCER_DEBUG
       puts "Drawing at #{@x - camera_x}, #{@y - camera_y}"
     end
-    @image.draw(camera_zoom * (@x - camera_x), camera_zoom * (@y - camera_y), 0, camera_zoom, camera_zoom)
+    @image.draw(@draw_x, @draw_y, 0, @camera_zoom, @camera_zoom)
   end
 end