a std_msgs/ColorRGBA message

edit

hello everyone

i am just a beginner with ROS system. i am trying to writing a publisher node, which send a colorRGBA message to the subscriber about the topic "visualization_kit".

but it's unable to display the color,here are my codes

int main(int argc, char **argv)
{

  ros::init(argc, argv, "talker");

  ros::NodeHandle n;

  ros::Publisher chatter_pub = n.advertise<std_msgs::ColorRGBA>("chatter", 1000);

  while(ros::ok())
  {
    std_msgs::ColorRGBA color;

    color.r = 255;
    color.g = 0;
    color.b = 0;
    color.a = 1;

    //draw.colors.push_back(color)

    ROS_INFO("%s","visualisation_kit");

    chatter_pub.publish(color);

    ros::spinOnce();
  }

  return 0;
}

thanks for your help.