Velocity vs Time data while drawing with mouse pointer
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Hi everyone. I will be very grateful for any opinion on my matter:
Briefly, I need to calculate velocity over time, while drawing a circle. For instance I start to draw the circle with constant velocity and subsequently slow down. I have to draw some kind of a graph attached.
It doesn't always have to be circle but the curve i draw should have continuity and non-linearity. I can write the code for polygons using the start and finish coordinates of the straight lines with tic-toc function. However for continuous curves, i unfortunately have no idea.
All help would be so appreciated.
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Walter Roberson
2015-12-10
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This does not record the time of the events, but you can ask for the current time when the event is serviced; it will be a bit inaccurate though.
You might also wish to look at http://uk.mathworks.com/matlabcentral/answers/259577-how-to-record-mouse-coordinates-in-fixed-interval-like-0-01ms
Once you have the points and the time, you can calculate point-to-point distance using Euclidean distance calculations. That will not give you velocity as you need at least one further point in order to calculate relative direction. I notice, however, that in your question you are not plotting velocity, you are plotting instantaneous speed. (Remember: velocity is a vector, a direction and magnitude pair, not just magnitude.)
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