cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   jotajota
   Member

   Hi,

   I'm creating an action to make a wheel spin like this:
   
id oneSpin = [RotateBy actionWithDuration:3 angle: 360];
id severalSpins = [Repeat actionWithAction:oneSpin times:10];
[severalSpins setTag: kSpinAction];
[aWheel runAction:severalSpins];

   then if I want to stop it before it is scheduled, I will usually use a method that will do something like this:
   
id severalSpins = [aWheel getActionByTag:kSpinAction];
[aWheel stopAction:severalSpins];

   but, what if I want to decelerate the stopping of the wheel?

   I'm trying by first stoping "severalSpins" action and then launching ease actions with no success.

   Any ideas guys?
   Thxs.

   Posted 2 years ago #
2. 

   psionic
   Member

   My suggestions:

   You'll need to get the current rotation (maybe subclass rotateby to
   allow access to this parameter), then create a new action starting at
   the current rotation that will ease out the rotation rate to zero
   (possibly by applying a curve to the rotation rate over time, ending
   at zero), which would need to be done in a new action class.

   Chris.

   On Mon, Jun 15, 2009 at 5:40 PM, <cocos2d-iphone-discuss@gamesforfood.cl> wrote:
   > jotajota says:
   >
   > Hi,
   >
   > I'm creating an action to make a wheel spin like this:
   >
   > id oneSpin = [RotateBy actionWithDuration:3 angle: 360];
   > id severalSpins = [Repeat actionWithAction:oneSpin times:10];
   > [severalSpins setTag: kSpinAction];
   > [aWheel runAction:severalSpins];
   >
   > then if I want to stop it before it is scheduled, I will usually use a
   > method that will do something like this:
   > id severalSpins = [aWheel getActionByTag:kSpinAction];
   > [aWheel stopAction:severalSpins];
   >
   > but, what if I want to decelerate the stopping of the wheel?
   >
   > I'm trying by first stoping "severalSpins" action and then launching ease
   > actions with no success.
   >
   > Any ideas guys?
   > Thxs.
   >
   > Read the whole thread.

   Posted 2 years ago #
3. 

   jotajota
   Member

   Found a solution to my problem. Thanks psionic anyway.

   As I said before, I'm stoping the current action first. After that I'm creating the deceleration action. And for that, I'm using this:

   
id rotateAction = [RotateBy actionWithDuration:2 angle:180];
id easingAction = [EaseSineOut actionWithAction:[[rotateAction copy] autorelease]];


   This creates the nice deceleration on the wheel I was looking for.

   Hope it helps.

   Posted 2 years ago #

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