cocos2d for iPhone

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

1. 

   conor
   Member

   I'm trying to think of the best way to have a sprite follow another moving sprite for a heatseeking missile. I was going to try to create a moveby action and constantly check to see if the target has moved past a certain threshold and then recreate the moveby but this seems like a bad way of doing it.

   Is there a good way to do this with actions or should I be trying to do this manually?

   Posted 2 years ago #
2. 

   jd
   Member

   In a schedule check position of target vs. position of missile. Normalize velocity between the points. Apply force or manually update position of missile. Actions would not be good here.

   Posted 2 years ago #
3. 

   max9xs
   Member

   If you are using cocos2d then there is no another way to do so...but if u r using chipmunk then use Joints to do so....

   Posted 2 years ago #
4. 

   Farb
   Member

   @jd: the problem I found with that solution was that the missile can "turn on a dime" which wasn't realistic.

   @conor: this post on my blog may (or may not) help: http://www.farbish.com/forums/blog.php?b=70

   Posted 2 years ago #
5. 

   conor
   Member

   @jd: I was able to get the homing effect working with you suggestion. Much appreciated.

   @Farb: Very cool, I might implemented your approach as well

   Thanks,
   Conor

   Posted 2 years ago #
6. 

   jd
   Member

   Cool. I would adjust the angle like Farb's post since it looks trivial.

   Posted 2 years ago #
7. 

   Jeston
   Member

   This may sound extremely nit picky and not particular for you situation but I wanted to mention that I try to avoid adding specific tick functionality in sub classed sprites for the sole purpose that you can't extend it to other objects. In other words: I always feel movement code should not be attached to a particular object but rather a movement type should be applied to an object.

   I recommend making extending an interval action that seeks for a given amount of time. That way you can mix and match various movement types, like extremely fast forward movement, then seek, then go fast again for an aerial combat missile feel.

   Posted 2 years ago #

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