Animation with physics engine « cocos2d for iPhone

Animation with physics engine

(2 posts) (2 voices)

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username_
Member
I'm working on a game that uses Box2D for defining a physics world. I can easily simulate the bodies in my world using the Box2D APIs and update the positions of sprites (in a layer, for example) that visually represent characters as they're running around the world.

What I'd like to do, is animate the characters as they're moving in the world. Ideally I would be able to create a CCAnimate sequence and have that running when the bodies are moving, and not moving when the bodies stop. Something like:
```
CCAnimation* runAnimation = [CCAnimation animationWithName:@"walking" delay:0.1f frames:walkingAnimationFrames];
  _runAction = [CCRepeatForever actionWithAction: [CCAnimate actionWithAnimation: runAnimation restoreOriginalFrame: NO]];
  [_sprite runAction: _runAction];
```
Another option would be to setup a timer (or use "update") to update sprites manually and change the speed of the animation as a function of the velocity of the character running in the physics world.

Are there other options? Any suggestions on how to do this otherwise?

Thanks!
Posted 1 year ago #
mobilebros
Moderator

I'd say your suggestion about updating the animation frame as a function of velocity sounds decent, it's actually very easy to subclass actions; they have their own update function that will get called and that way you can re-use it.

Posted 1 year ago #

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