Constrain actor size to drag gesture?

jonnyDiamond · April 2011

Hi,

I have a tricky function that I cant solve. Here goes...

I want to control the size of an actor by touching it and dragging towards its center. As you touch the edge of the actor and drag towards its center - it gets smaller. As you drag outwards, away from its center - it gets bigger.

Currently I am able to track the x and y of a touch when you touch the actor but I can't figure out how to constantly measure the distance of the touch to the actors center. Also, I am not sure how to measure the distance as the touch drags away from the actor, because the touch may drag outside of the actor which means I may lose the x and y of the touch.

Am I approaching this the right way?

Any help will be greatly appreciated. Thanks

tenrdrmer · April 2011

You need to use magintude.
Its in the expression editor under functions

you'll create a real self attribute on the ball called distancetoCenter

then a rule

when touch is inside
--Constrain attribuite self.distancetocenter to magnitude(self.position.x-game.mouseposition.x,self.position.y-game.mouseposition.y)
--Constrain attribute self.width to self.distancetocenter*2

Hope that helps you out.

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jonnyDiamond · April 2011

Thanks tenrdrmer!

That worked a treat!

tenrdrmer · April 2011

Anytime. Glad it helped.

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Constrain actor size to drag gesture?

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