cocos2d for iPhone

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

1. 

   javy
   Member

   I was toying with the idea of how to make a screen shake. At first I thought of having a special class that would take a reference to a scene and then move the position of a whole scene with each tick of its selector.

   Then I was reading about the camera - even though I haven't used it yet.

   In a single-screen app, the camera sounds about right. A 'Shake' class would move the camera via it's scheduled calls until the shake was complete. Custom patterns could be made in simple CGPoint arrays for speed of processing.

   But before I write all this code, is there a screen shake style functionality built-in already? I'd hate to re-invent the wheel. A solid search of the forums turned up nothing.

   If it doesn't exist, does my initial design of the class seem good?

   Any constructive feedback welcomed!

   Posted 2 years ago #
2. 

   DetectiveCakes
   Member

   Check out the EffectsTest in the cocos2d-iphone project, there is already a shake effect that is probably pretty close to what you're looking for.

   Posted 2 years ago #
3. 

   javy
   Member

   Thank you Detective. However, the implementation of the grid3d, etc - all appears kind of...well...excessive for a simple screen shake. I may just be missing the importance of the effects code that is already included. On the other hand, I just want to move all of the existing graphics for each tick of a scheduled event. I don't have a need for special lenses or waves (although the effects are VERY nice).

   Any further suggestions?

   Posted 2 years ago #
4. 

   javy
   Member

   Well, I went ahead with making a sub-class of CocosNode that can take a pointer to any other Cocosnode and 'shake' it.

   The NodeShaker class is instantiated by any Scene or Layer (or actually any CocosNode object) and is added as a child so it's scheduler can be called. I didn't want to add it as a child, but that's the only way the scheduler in it was able to be called.

   In its test, I passed it a reference to the entire scene (acquired from the director) and the shake works great. No worries about setting positions of sprites, managers or even layers and having conflicts. So far, anyways.

   Posted 2 years ago #
5. 

   Olmeister
   Member

   Hmm, I just implemented my own solution.
   Inside some arbritrary tick method define the x & y coordinates with arc4random,
   then shake the desired layer (self)...
   if (isShaking){
   float randx = (arc4random() %1) - 0.5;
   float randy = (arc4random() %1) - 0.5;

   [self position].x = randx;
   [self position].y = randy;
   }
   else {
   //Return camera//CCFollow to target
   }

   Posted 9 months ago #
6. 

   jd
   Member

   I did the same thing. Works well.

   Posted 9 months ago #

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