cocos2d for iPhone

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

1. 

   hm50
   Member

   Hello all! I am looking for some optimization tips... I am adding dynamically several (over 200) menuItems, sprites, and labels onto a scrolling layer. Everything is loaded and works fine, however, on device, my fps drops from 60 to 18, thus making scrolling very sluggish. I have included below a code snippet, how can I optimize this to increase that frame rate..?? Is there a way to release some of these resources? Cocos releases all of the sprites,menus, labels when I leave the scene so I assume these are all in the autorelease pool. Thanks in advance for any help.
   

   for (int x = 0; x < dictionaryCount; x++){
   			xString = [NSString stringWithFormat:@"%d",x];
   			item = [dictionary objectForKey:xString];
   			CCLabel *itemLabel = [CCLabel labelWithString:NSLocalizedString(item,@"") dimensions:CGSizeMake(200, 30) alignment:UITextAlignmentLeft fontName:@"Marker Felt" fontSize:22];
   			[scrollLayer addChild:itemLabel z:0];
   			[itemLabel setColor:ccc3(250,250,5)];
   			itemLabel.position = ccp( 200, startingY);
   
   			CCMenuItemImage *FlagButton1 = [CCMenuItemImage itemFromNormalImage:@"AddFlag.png" selectedImage:@"Flag.png" target:nil selector:nil];
   			CCMenuItemImage *FlagButton2 = [CCMenuItemImage itemFromNormalImage:@"MinusFlag.png" selectedImage:@"Flag.png" target:nil selector:nil];
   			CCMenuItemToggle *toggleItem = [CCMenuItemToggle itemWithTarget:self selector:@selector(addFlag:) items:FlagButton1, FlagButton2, nil];
   			CCMenu *flagMenu = [CCMenu menuWithItems:toggleItem, nil];
   			[flagMenu setPosition:ccp(370, startingY)];
   			[scrollLayer addChild:flagMenu z:0 tag:x];
   			if ([flaggedItems containsObject: item]) {
   				[toggleItem setSelectedIndex: 1];
   			}else{
   				[toggleItem setSelectedIndex: 0];
   			}
   
   			CCSprite *line = [CCSprite spriteWithFile:@"line.png"];
   			[line setPosition:ccp( wins.width/2, startingY-25)];
   			[scrollLayer addChild:line z:0];
   
   			startingY = startingY - 50;
   
   		}

   Harv

   Posted 1 year ago #
2. 

   PhilM
   Member

   I think your stretching the word 'several' there! You can run the tests that come with cocos2d to see performance results with various amounts of sprites and other nodes on the screen. But you should be able to get much better speeds than that with some tweaks.

   I'd firstly suggest replacing your labels with bitmap fonts, or label atlases, as regular labels can be quite slow.

   Do you need all 200 sprites/labels on screen at the same time? If not, you may want to create a cache of sorts, where you could store pre-allocated sprites and bitmap fonts, use them when needed, and re-add to the cache when finished.

   I'd also re-consider using the menu to handle so many items. It may be more efficient to make them regular sprites, preferably using a spritesheet to batch up draw calls, & then handle the touch detection yourself.

   Hope that helps.

   Posted 1 year ago #

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