code: def _create_particle(self, point1, point2, grass):
      class Particle:
          pass
  
      p = Particle()
      p.color = WHEEL_COLOR if not grass else MUD_COLOR
      p.ttl = 1
      p.poly = [(point1[0], point1[1]), (point2[0], point2[1])]
      p.grass = grass
      self.particles.append(p)
      while len(self.particles) > 30:
          self.particles.pop(0)
      return p
  
file_path: gym/gym/envs/box2d/car_dynamics.py
imports: import math
  import Box2D
  import numpy
  from gym.error import DependencyNotInstalled
label_desc: Use image node_id 7 for calling the Car obj's underlying member method code with example usage: obj._create_particle(point1, point2, grass) and returns: p