text: # Copyright 2018 Flight Lab authors.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  """Library for lighting components."""
  
  from components import base
  from utils import light
  
  
  class DMXLightComponent(base.Component):
    """Component to control DMX lighting."""
  
    _CHANNELS = [1, 17, 33, 49]
  
    def __init__(self, proto, *args, **kwargs):
      """Creates DMXLightComponent instance.
  
      Args:
        proto: flightlab.DMXLight protobuf.
      """
      super(DMXLightComponent, self).__init__(proto, *args, **kwargs)
      self._dmx = light.Dmx(port=self.settings.com)
      self._effects = [
          light.SimLightEffect(dmx=self._dmx, channel=ch) for ch in self._CHANNELS
      ]
      for effect in self._effects:
        effect.start()
  
    def close(self):
      """Stops effects and turns off lights."""
      for effect in self._effects:
        effect.stop()
      self._effects = []
      if self._dmx:
        self._dmx.close()
        self._dmx = None
      super(DMXLightComponent, self).close()
  
    def _start(self):
      for effect in self._effects:
        effect.on()
  
    def _stop(self):
      for effect in self._effects:
        effect.off()
  