Accessing point32 under geometry_msgs/PolygonStamped

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my callback function looks like void Callback(const PolygonStampedConstPtr& poly). Inside callback I am doing float u = poly->polygon.points.x; float v = poly->polygon.points.y;. But according to your answer what should my i be?

i depends on the vector. You have multiple elements, so it should be within the range of the number of polygons. You could also iterate over the full vector...

It solved my problem. Thanks mig. I also want the time difference between consecutive calls to callback function. Can you tell how it would be done? I was thinking of difference b/w ros::time::now, but don't know how to use it!

please post a new question..

Yaa got it!