Swift: create CGPath from attributed string

gistfile1.txt

	
	func appendToPath(path: CGMutablePath)
	{
		let textPath = CGPathCreateMutable()

		let attributedString = NSAttributedString(string: string)
		let line = CTLineCreateWithAttributedString(attributedString)
		
		// direct cast to typed array fails for some reason
		let runs = (CTLineGetGlyphRuns(line) as [AnyObject]) as! [CTRun]

		for run in runs
		{
			let attributes: NSDictionary = CTRunGetAttributes(run)
			let font = attributes[kCTFontAttributeName as String] as! CTFont
			
			let count = CTRunGetGlyphCount(run)
			
			for index in 0..<count
			{
				let range = CFRangeMake(index, 1)
				
				var glyph = CGGlyph()
				CTRunGetGlyphs(run, range, &glyph)
				
				var position = CGPoint()
				CTRunGetPositions(run, range, &position)
				
				let letterPath = CTFontCreatePathForGlyph(font, glyph, nil)
				var transform = CGAffineTransformMake(1, 0, 0, -1, position.x, position.y)
				
				CGPathAddPath(textPath, &transform, letterPath)
			}
		}
		
		var transform = CGAffineTransformMakeTranslation(location.x, location.y)
		CGPathAddPath(path, &transform, textPath)
	}

What's location.x and location.y ?