cocos2d for iPhone

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

1. 

   Drenguin
   Member

   I am beginning to build a game where I expect lots of sprites to be on the screen as well as some particle effects. I was wondering about a couple of things, specifically about moving sprites. When I go to move my sprites around should I have it so that:
   -There is one main loop that goes through every sprite on the screen and moves them itself?
   -Each sprite has a selector inside it that moves on itself?
   -The main loop calls a "move" method on each sprite and the sprite then moves itself?

   Also, when using a lot of particle effects what is the best way to create particles? Should I use the built in cocos2d particle generators?

   Posted 6 months ago #
2. 

   h202
   Member

   -There is one main loop that goes through every sprite on the screen and moves them itself?

   In my opinion this approach is not that efficient because in the long run you don't get the flexibility and if you're schedulers etc are not timed properly. you can get a jitter which is a big turn off

   -Each sprite has a selector inside it that moves on itself?

   A much more decent approach but still way too much code

   -The main loop calls a "move" method on each sprite and the sprite then moves itself?

   I am against it like I said above

   Here's what I did in my current game. Implement a general function that takes any sprites and moves it on to the desired path.

   -(void) moveAnySprite:(CCSprite *) sprite inInterval:(CGFloat)duration withX:(CGFloat) x andY:(CGFloat) y
   {

   id action=[CCMoveTo actionWithDuration:duration position:ccp(x,y);
   id actionFinished=[CCCalFunc actionWithTarget:self selector:@selector(moveDone:)]; //

   [sprite runAction:[CCSequence actions:[action, actionFinished, nil]];
   }

   -(void) moveDone:(id) sender
   {
   NSLog(@"Move Completed");

   }

   Since we are using ccsequence the actionFinished will be called after mvoe is finished and we'll know it

   -Chris

   Posted 6 months ago #
3. 

   itlgames
   Moderator

   A main single loop has been used for decades on games, sucks is a hard word, an is probably more efficient than one loop for each sprite.

   Posted 6 months ago #
4. 

   h202
   Member

   @itlgames yes you are right "sucks" is a hard word but it is based on my experience. the whole one function to control sprites has never worked out for me. Editing that word by the way

   Posted 6 months ago #
5. 

   itlgames
   Moderator

   I didn't mean you to remove the word! What I wanted to say is that what it works for others may not be what works for you. And the other way round. One loop for each object is bad, I agree. I have in fact used both single loop and individual schedules like you suggested. They both work. It just depends of what you new to do.

   Posted 6 months ago #
6. 

   Drenguin
   Member

   Okay, I just was wondering what the most efficient way to do things was. I think that one main loop that moves everything seems like the best way to do it.

   Posted 6 months ago #
7. 

   mrdckx
   Member

   Currently I have a problem related to the one discussed here.

   The situation: Making a side scrolling game. One main loop calls a function which moves 4 layers. On the different layers there are moving sprites. When different sprites are moving in combination with the 4 moving layers, this causes the game to not move that smooth anymore.

   Things you should know:
   - I use sprite sheets
   - There are no memory leaks
   - CPU is not fully used
   - Only the sprites on the screen are displayed (what I mean is that the problem is not related to to many sprites, I think..)
   - Sometimes there is a warning about the capacity but due to some searching I found that this is normal.
   - When I move a sprite (for example the player) the sprite is used in other methods to get it's current location
   - Because of the moving layers, their x position gets small really fast

   Should the iPhone be able to run this? I think so..

   Are there any tips on optimizing this? Thanks in advance!

   Posted 5 months ago #

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