changed TICK_DURATION from a constant to a parameter that we pass into robot

src/robotwar/robot.clj

@@ -2,9 +2,8 @@
   (:require [robotwar.brain :as brain]
             [robotwar.register :as register]))
 
-; TICK_DURATION is in seconds. MAX_ACCEL is in decimeters per second per second. 
+; MAX_ACCEL is in decimeters per second per second. 
 ; TODO: should be passed in from some higher level module, or a config module.
-(def TICK_DURATION 1)
 (def MAX_ACCEL 40)
 
 ; yay classical mechanics
@@ -73,7 +72,7 @@
   TODO: add support for collision with walls first (right now it just 
   stops when it gets there, and doesn't get damaged or bounce), 
   then support for collision with other robots." 
-  [{robot-idx :idx :as robot} world]
+  [{robot-idx :idx :as robot} world tick-duration]
   (if (>= (:damage robot) 100)
     world
     (let [new-world (brain/step-brain 

src/robotwar/world.clj

@@ -2,6 +2,12 @@
   (:use [clojure.string :only [join]])
   (:require [robotwar.robot :as robot]))
 
+
+(def TICK_DURATION 1)
+
+
+; TODO: pass in tick-duration to world from somewhere else.
+;
 (defn init-world
   "initialize all the variables for a robot world."
   [width height programs]
@@ -26,7 +32,7 @@
   each robot. Because otherwise, do we step the shells after every 
   single robot has their turn?"
   [{:keys [robots robot-idx] :as world}]
-  (assoc (robot/step-robot (robots robot-idx) world)
+  (assoc (robot/step-robot (robots robot-idx) world TICK_DURATION)
          :robot-idx
          (mod (inc robot-idx) (count robots))))