cleaned up the simple_examlpe_N files

added reset() function to rendertools

examples/simple_example_1.py

@@ -20,6 +20,5 @@ env.reset()
 
 env_renderer = RenderTool(env)
 env_renderer.render_env(show=True)
-env_renderer.render_env(show=True)
 
 input("Press Enter to continue...")

examples/simple_example_2.py

@@ -34,6 +34,5 @@ env.reset()
 
 env_renderer = RenderTool(env, gl="PIL")
 env_renderer.render_env(show=True)
-env_renderer.render_env(show=True)
 
 input("Press Enter to continue...")

examples/simple_example_3.py

@@ -23,7 +23,6 @@ for i in range(env.get_num_agents()):
 
 env_renderer = RenderTool(env)
 env_renderer.render_env(show=True, frames=True)
-env_renderer.render_env(show=True, frames=True)
 
 print("Manual control: s=perform step, q=quit, [agent id] [1-2-3 action] \
        (turnleft+move, move to front, turnright+move)")

flatland/utils/rendertools.py

@@ -57,6 +57,17 @@ class RenderTool(object):
         self.new_rail = True
         self.update_background()
 
+    def reset(self):
+        """
+        Resets the environment
+        :return:
+        """
+        self.set_new_rail()
+        self.frame_nr = 0
+        self.start_time = time.time()
+        self.times_list = deque()
+        return
+
     def update_background(self):
         # create background map
         targets = {}