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# Create a new PDF file and draw a red circle in it, using Core Graphics.

framework 'Cocoa'

url = NSURL.fileURLWithPath('circle.pdf')

prect = Pointer.new(CGRect.type)

prect[0] = [[0, 0], [617, 792]]

pdf = CGPDFContextCreateWithURL(url, prect, nil)

CGPDFContextBeginPage(pdf, nil)

CGContextSetRGBFillColor(pdf, 1.0, 0.0, 0.0, 1.0)

CGContextAddArc(pdf, 300, 300, 100, 0, 2 * Math::PI, 1)

CGContextFillPath(pdf)

CGPDFContextEndPage(pdf)

CGContextFlush(pdf)

# CGContextRef is a resourceful object, so it must be released manually.

CFRelease(pdf)