rqt_plot: Plot bool fields

[DLu]

Add the capability to plot bool fields in composite messages.

[dirk-thomas]

Can you please provide a reproducible example.

[DLu]

#!/usr/bin/python

import rospy
from sensor_msgs.msg import BatteryState
import random

rospy.init_node('x')
pub = rospy.Publisher('/battery', BatteryState, queue_size=1)
r = rospy.Rate(2)
while not rospy.is_shutdown():
  b = BatteryState()
  b.header.stamp = rospy.Time.now()
  b.present = random.random() > 0.5
  b.voltage = random.random()
  pub.publish(b)
  r.sleep()

Run the above script, and then run this:
! ~/ > rqt_plot /battery/voltage /battery/present

Before the pull request, only voltage will be published. After, both signals we be published.

[dirk-thomas]

Thank you. This works well for me.

Maybe the message should be adjusted to mention that it is a boolean field rather then a numeric one. I would suggest adding topic_kind = 'boolean' if field_class == bool else 'numeric' and then use that as a placeholder for both messages.

[DLu]

Good thought. Updated.

[dirk-thomas]

Thanks.