CODEWITHSUNDEEP
c++xcodecocos2d-xsprite-sheet
user2692561
user2692561

Reputation:

Cocos2D-X most efficient way to select the appropriate sprite sheet

I have 3 sets of sprite sheets for my first scene. I'm using XCode to develop for iOS using Cocos2D-X.

The first sprite sheet has an extension -sd, the second sprite sheet has -hd, and the third set has 3 sprite sheets (using Multipack in Texture Packer Pro) with the extension -ipadhd. I followed a tutorial and I found a method that goes like this

CCString* file = (Utils::getArtScaleFactor() > 1) ? CCString::create("randomFile-hd.plist") : CCString::create("randomFile-sd.plist");

//The Utils::getArtScaleFactor function
float Utils::getArtScaleFactor()
{
    return artScaleFactor;
}

1- Is there a similar way to choose between 3 files instead of 2?

2- Is this the common method for choosing the appropriate file size-wise?

3- This question is somewhat off the topic I was discussing but I really need an answer to it too: I have an animation and its frames are split into 3 sprite sheets, how do I cache 3 .plist files? And if that's impossible, what are my options?

Hope I provided all the necessary information!

Regards

Upvotes: 1

Views: 385

Answers (1)

Justin Godesky
Justin Godesky

Reputation: 1019

  1. Sure, but that ternary operator should probably be switched out with another construct (like a switch) for clarity and flexibility.

    For example:

    // Always init your pointers.
CCString* file = NULL;

switch (Utils::getArtScaleFactor()) 
{
  // Scale factor shouldn't ever be 0, but we should account for it 
  // so it doesn't get picked up by the default case.
  case 0:
  case 1:
    file = CCString::create("randomFile-sd.plist");
    break;

  case 2:
    file = CCString::create("randomFile-hd.plist");
    break;

  // Scale factors 3 and above get the largest resource.
  default:
    file = CCString::create("randomFile-super-hd.plist");
    break;
}

  2. Yes, this type of logic is on the wiki, except they use if-else for three resource sizes. I've seen it on the forums and tutorials, too.

  3. According to this thread on the cocos2d-iphone forums, yes:

CCSprite can display CCSpriteFrames with different textures. So there’s no problem at all even to use animation that mixes frames from different textures (spritesheets) - Stepan Generalov

The implementations posted there are in obj-c but you can convert the cocos2d api calls to cpp easily.

Upvotes: 1

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