Move only on the X axe

[TheMyrel]

Hello!
I’m trying to create the game pong and I want to move a paddle only horizontally.
For now it’s moveing anywere I’m looking on the screen.
Can someone please give me an idea how can I achive that?

I have the code here if you want to take a look:www.dropbox.com/s/2afveqo3m2iyww8/joc.rar?dl=0

I’m working with Visual Studio 2010 and XNA 4.0

Thanks!

[Jenny [Tobii]]

Hi,

If you only want to change the X value, then only change the X value in your code.
Hard-code the Y value to the Y position you want your paddle to slide along, and update the X value according to the Gaze Point’s X value.

You should probably also do some filtering of the Gaze Point’s X value so that the paddle does not jiggle or jump back and forth.

You can filter the eye-gaze data by calculating a moving average using the last 10 Gaze Points. Here is a simple description of how to calculate a moving average:
http://www.statisticshowto.com/moving-average/
This will make all paddle movements overall slower and smoother.

A more advanced filtering would be to use an exponentially decaying filter as explained here:
http://stackoverflow.com/questions/3760506/smoothing-values-over-time-moving-average-or-something-better
This would make the paddle steady when the eye-gaze is focused on specific point, but fast when moving the eye-gaze to another part of the screen.

[TheMyrel]

Thank you a lot for the answer!
I’ll give it a try.

[Author]

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