source.py

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#!/usr/bin/env python
# Software License Agreement (BSD License)
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# Copyright (c) 2008, Willow Garage, Inc.
# Copyright (c) 2016, Tal Regev.
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import sys
import time
import math
import rospy
import numpy
import cv2

import sensor_msgs.msg
from cv_bridge import CvBridge


# Send black pic with a circle as regular and compressed ros msgs.
class Source:

    def __init__(self):
        self.pub            = rospy.Publisher("/opencv_tests/images", sensor_msgs.msg.Image)
        self.pub_compressed = rospy.Publisher("/opencv_tests/images/compressed", sensor_msgs.msg.CompressedImage)

    def spin(self):
        time.sleep(1.0)
        started = time.time()
        counter = 0
        cvim = numpy.zeros((480, 640, 1), numpy.uint8)
        ball_xv = 10
        ball_yv = 10
        ball_x = 100
        ball_y = 100

        cvb = CvBridge()

        while not rospy.core.is_shutdown():

            cvim.fill(0)
            cv2.circle(cvim, (ball_x, ball_y), 10, 255, -1)

            ball_x += ball_xv
            ball_y += ball_yv
            if ball_x in [10, 630]:
                ball_xv = -ball_xv
            if ball_y in [10, 470]:
                ball_yv = -ball_yv

            self.pub.publish(cvb.cv2_to_imgmsg(cvim))
            self.pub_compressed.publish(cvb.cv2_to_compressed_imgmsg(cvim))
            time.sleep(0.03)


def main(args):
    s = Source()
    rospy.init_node('Source')
    try:
        s.spin()
        rospy.spin()
        outcome = 'test completed'
    except KeyboardInterrupt:
        print "shutting down"
        outcome = 'keyboard interrupt'
    rospy.core.signal_shutdown(outcome)

if __name__ == '__main__':
    main(sys.argv)