cocos2d for iPhone

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

1. 

   byron
   Member

   Hello,

   I am currently attempting to update an Action I have running, i have created a simple MoveTo action which moves a sprite to my players position. The sprite is an enemy that follows the player at a set speed.

   When I move the player I'd like to update the new position so that my enemy sprite will follow. although I cannot seem to work out how.

   I have tried to cancel the previous action and update with a new one using the players new position and calculating the time from speed and distance. Then i found the endPosition variable within the MoveTo declaration.. which is read only.

   Is there a very simple way for me to do this? am i overlooking the obvious. or do i have to subclass MoveTo or IntervalAction etc.. to make the endPosition variable readonly?? An enemy following a player must be implemented in many games.. How do i do this?

   Should I forget about using actions and calculate the next point myself and simply change enemy.position?

   Any help would be greatly appreciated

   Thanks
   Byron

   Posted 1 year ago #
2. 

   hm50
   Member

   What about scratching the MoveTo action and updating the enemy position in your update method?

   Posted 1 year ago #
3. 

   eiskanda
   Member

   What I did for one of my games is have a CCRepeatForever action that calls a custom selector (CCCallFunc) every couple seconds (e.g. doAI) on the enemy class. Something like this:

   [self runAction: [CCRepeatForever actionWithAction: [CCSequence actions: [CCDelayTime actionWithDuration: 3.0F], [CCCallFunc actionWithTarget: self selector: @selector(doAI)]]]];

   The doAI selector in this example, moves the enemy towards the player (cancelling the previous action or waiting for it depending on what you are trying to do).

   hope this helps somewhat.

   Posted 1 year ago #
4. 

   lordbritishix
   Member

   here's one approach that some guy did to reorient the position of the enemy relative to the player. He basically did it by segments (e.g. recompute the end position after moving a certain amount of distance) so as not to recompute the end point every now and then:

   http://geekanddad.wordpress.com/2010/06/22/enemies-and-combat-how-to-make-a-tile-based-game-with-cocos2d-part-3/

   Cheers!

   Posted 1 year ago #

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