Looking for suggestions to make turn in reverse animation less harsh

cocos2d for iPhone » Programming » cocos2d support (graphics engine)

Looking for suggestions to make turn in reverse animation less harsh

(4 posts) (2 voices)

Started 2 years ago by iisystems
Latest reply from shadaz

Tags:

animation turn Spawn runAction

iisystems
Member

Hi,

I wanted to throw a question out there to see if anyone has thought about this problem (and hopefully has a solution to it). I want to perform a turn animation. Imagine a character that paces back and forth over an unknown distance. Currently, I have animation and movement. I flip the sprite when the movement is to be reversed, so there is no actual turn; the character simply flips instantaneously on the Y-axis. Here's the code:

currentFrameAnimation = [RepeatForever actionWithAction:[Animate actionWithAnimation:animation]]; [self runAction:currentFrameAnimation]; // Run the frame animation
id actionOneWay = [MoveBy actionWithDuration:[self getAnimationDuration:ani] position:ccp(ani->to.x - ani->from.x, ani->to.y - ani->from.y)];
id actionScale = [ScaleBy actionWithDuration: 0.0f scaleX:-1 scaleY:1]; id animationSwim; currentMovementAnimation = [RepeatForever actionWithAction: [Sequence actions:actionOneWay, [DelayTime actionWithDuration:ani->delay], actionScale, [actionOneWay reverse], [DelayTime actionWithDuration:ani->delay], [actionScale reverse], nil]]; [self runAction:currentMovementAnimation]; // Run the movement animation

I may be answering my own question here, but my thought is to combine these two actions using Spawn and insert a new turn animation in the move sequence. Has anyone tried this? In the meantime, I'll do it now and post back the results...

Thanks!
Scott

Posted 2 years ago #
iisystems
Member

Actually, I forgot... my thought above will not work for me, so I do need suggestions. I have these actions separate for a reason. The animation action is stopped and replaced with other frames as the character gets sicker. Obviously I can't stop the movement animation and restart it from the original position, so I don't think I can combine these two actions into one.

So... thoughts and suggestions?

Thanks again!

Posted 2 years ago #
iisystems
Member

So after many hours, I have a solution which I'll post in hopes it helps someone else...

I settled on a timer which runs concurrent to the animation. When the timer fires, I kick off the turn animation and another timer. When that timer fires, I proceed with the main animation.

Posted 2 years ago #

shadaz
Member

If you are willing to modify cocos2d core code, I was able to do reverse easily. I have seen many requests for this and it is very simple so I wish they would implement reverse for animation. The concept is just to flip the index of the current frame. Anyway here is my code:

-(void)reverse
{
	isReverse = true;
}

-(void) update: (ccTime) t
{
	NSUInteger idx=0;

	ccTime slice = 1.0f / [[animation frames] count];

	if(t !=0 )
		idx = t/ slice;

	if( idx >= [[animation frames] count] ) {
		idx = [[animation frames] count] -1;
	}

	if (isReverse)
		idx = ((idx - ([[animation frames] count]-1)) *-1);

	id<CocosNodeFrames> sprite = (id<CocosNodeFrames>) target;
	if (! [sprite isFrameDisplayed: [[animation frames] objectAtIndex: idx]] ) {
		[sprite setDisplayFrame: [[animation frames] objectAtIndex:idx]];
	}
}

Posted 2 years ago #

RSS feed for this topic

Reply

You must log in to post.