Used a fixed time step for Simulator

lib/pages/simulator.rb

@@ -10,7 +10,6 @@ module TAC
             save_source
 
             begin
-              @simulation_start_time = Gosu.milliseconds
               @simulation = TAC::Simulator::Simulation.new(source_code: @source_code.value, field_container: @field_container)
               @simulation.start
             rescue SyntaxError, NameError, NoMethodError, TypeError, ArgumentError => e
@@ -78,7 +77,7 @@ robot.forward 100"
         @simulation.update
 
         unless @simulation.robots.all? { |robot| robot.queue.empty? } # Only update clock if simulation is running
-          @simulation_status.value = "Time: #{((Gosu.milliseconds - @simulation_start_time) / 1000.0).round(1)} seconds" if @simulation_start_time
+          @simulation_status.value = "Time: #{(@simulation.simulation_time).round(1)} seconds"
         end
       end
     end

lib/simulator/simulation.rb

@@ -1,7 +1,8 @@
 module TAC
   class Simulator
     class Simulation
-      attr_reader :robots, :show_paths
+      attr_reader :robots, :show_paths, :simulation_time
+
       def initialize(source_code:, field_container:)
         @source_code = source_code
         @field_container = field_container
@@ -11,6 +12,9 @@ module TAC
         @show_paths = false
 
         @last_milliseconds = Gosu.milliseconds
+        @simulation_step = 1.0 / 60.0
+        @accumulator = 0.0
+        @simulation_time = 0.0
       end
 
       def start
@@ -23,8 +27,15 @@ module TAC
       end
 
       def update
-        @field.update
-        @robots.each { |robot| robot.update((Gosu.milliseconds - @last_milliseconds) / 1000.0) }
+        @accumulator += (Gosu.milliseconds - @last_milliseconds) / 1000.0
+
+        while(@accumulator > @simulation_step)
+          @field.update
+          @robots.each { |robot| robot.update(@simulation_step) }
+
+          @accumulator -= @simulation_step
+          @simulation_time += @simulation_step
+        end
 
         @last_milliseconds = Gosu.milliseconds
       end