fixed type error that originated from pygame.Surface() #117
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when running "abr_control/examples/PyGame/avoid_obstacles.py" a type error is raised caused by 'pygame.Surface()'. It is fixed by casting the input param to int.
Error:
Traceback (most recent call last):
File "/home/steffen/workspace_common/abr_control/examples/PyGame/avoid_obstacles.py", line 37, in
interface = PyGame(robot_config, arm_sim, on_click=on_click)
File "/home/steffen/workspace_common/abr_control/abr_control/interfaces/pygame.py", line 86, in init
self.lines_base.append(pygame.Surface((L, line_width), pygame.SRCALPHA, 32))
ValueError: size needs to be (number width, number height)