multiline BitmapFontAtlas for Cocos2D-iPhone

MultilineBitmapFontAtlas.m

/*
 * adapted from http://www.cocos2d-iphone.org/forum/topic/207
 *
 * Returns a CCNode with the string. It splits on new lines and returns the length of the final node.
 * The length parameter is there to know the final length of the node (pass nil if you don't need it).
 * 
 * 
 * call it this way:
 *
 *   int length;
 *   CCNode *credits = [self multilineNodeWithText:creditsText length:&length];
 * 
 */
- (CCNode *)multilineNodeWithText:(NSString *)text length:(int *)length {
	NSInteger lineChars = 0;
	BOOL isSpace = NO, isNewLine = NO;
	NSInteger index = 0;
	NSInteger numLines = 0;
	
	NSMutableString *line = [NSMutableString stringWithCapacity:LINE_LENGTH];
	
	CCNode *container = [CCNode node];
	while (index <= [text length]) {
		if (index == [text length]) {
			CCBitmapFontAtlas *tip = [CCBitmapFontAtlas bitmapFontAtlasWithString:[NSString stringWithString:line]
																		  fntFile:@"roll_no_one_small.fnt"];
			tip.anchorPoint = ccp(0,0);
			tip.position = ccp(0,0 - 37 * numLines); // 35 (+2 padding) is roll_no_one_small height
			[container addChild:tip];
			
			// set length output parameter if needed
			if (length) {
				*length = 37 * numLines;
			}
			return container;
		}
		
		NSString *tmp = [text substringWithRange:NSMakeRange(index, 1)];
		[line appendString:tmp];
		
		if ([tmp isEqual:@" "])
			isSpace = YES;
		else
			isSpace = NO;
		if ([tmp isEqual:@"\n"])
			isNewLine = YES;
		else
			isNewLine = NO;
		
		if ((lineChars >= LINE_LENGTH && isSpace) || isNewLine) {
			CCBitmapFontAtlas *tip = [CCBitmapFontAtlas bitmapFontAtlasWithString:[NSString stringWithString:line]
																		  fntFile:@"roll_no_one_small.fnt"];
			tip.anchorPoint = ccp(0,0);
			tip.position = ccp(0,0 - 37 * numLines);
			[container addChild:tip];
			lineChars = -1;
			[line setString:@""];
			numLines++;
		}
		lineChars++;
		index++;
	}
	// we should never reach this
	return nil;
}