Queuing actions real time or Real Time action modification

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Queuing actions real time or Real Time action modification

(7 posts) (5 voices)

Started 2 years ago by peter78
Latest reply from bradparks

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peter78
Member

I have 2 problems that are of a similar nature regarding actions.

In one case, I'm taking user input (hitting a button) to rotate an object. If the user hits the button twice very fast, then I'll get an "Action already running" error. The desired response would be that the object would rotate twice (as if actions that user tries to run while an action is running are queued). Because the user input is arbitrary I can't run a Sequence action.

In another case, I'm taking user input (hitting a button) to move an object (left or right by a fixed lengths). Simultaneously, the object moves on it's own at regular intervals (down at fixed lengths). If the user hits a button to move the object while the drop action is running, then that action will be stopped. The result is that objects that are supposed to move at expected lengths due to action interrupts.

How are you all dealing with this kind of problem? I imagine it's pretty common. Even though I've been using Cocos for a while, I didn't have this kind of issue with my last game. I've searched through the forums and having found anything.

TIA

Posted 2 years ago #
Lam
Member

I tag my actions so i can retrieve them. Stop the tagged action, do whatever's needed to the new action (like doubling the rotation rate) then rerun the action.

I've never encountered that error before though.

Are you trying to use the same action without copying it?
It's always better to instantiate a new action to run or copy a stored action than reusing.

Posted 2 years ago #
daemonk
Member

I've noticed that too. Cocos2d seems to freeze when you try to run an action on a target while its already running something else. I would do what Lam suggested and stop the action running on the target and then run the new action.

Posted 2 years ago #

bradparks
Member

Here's a couple of functions you can use to create an action sequence or spawn list at runtime from an array of actions:

+(Action *) getActionSequence: (NSArray *) actions
{
	FiniteTimeAction *seq = nil;
	for (FiniteTimeAction *anAction in actions)
	{
		if (!seq)
		{
			seq = anAction;
		}
		else
		{
			seq = [Sequence actionOne:seq two:anAction];
		}
	}
	return seq;
}

+(Action *) getActionSpawn: (NSArray *) actions
{
	FiniteTimeAction *result = nil;
	for (FiniteTimeAction *anAction in actions)
	{
		if (!result)
		{
			result = anAction;
		}
		else
		{
			result = [Spawn actionOne:result two:anAction];
		}
	}
	return result;
}

Posted 2 years ago #

peter78
Member

Awesome suggestions. I'll look into all of these. Thanks guys!

Posted 2 years ago #
shaojingkk
Member

I used bradparks's solution, my action is a sequence with a DelayTime and a CallFuncND, after run 3 actions, I got EXC_BAD_ACCESS.

Posted 2 years ago #
bradparks
Member

Usually EXC_BAD_ACCESS in this type of situation is the result of releasing something that you didn't need to release... All actions are "autoreleased", so you shouldn't need to be releasing them anywhere... So try and check your retains/releases.....

Posted 2 years ago #

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