Improve _coordinates internal function by caching it's result in the event object #376
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While digging in the touch event handling of your script, I saw that you heavily using the _coordinates function which works everytime.
In order to improve it a little bit, I just cached the result of it in a new coords property of the event.
I tested it quickly and it seems to work correctly, but you may test it more on your behalf to be sure it doesn't have other impacts.
Hope it helps.