NumberExtensions.swift

extension Float {
    
    static func rand48() -> Float {
        return Float(Double.rand48())
    }
    
    static var tau: Float {
        return .pi * 2
    }
}

extension CGFloat {
    
    static func rand48() -> CGFloat {
        return CGFloat(Double.rand48())
    }
    
    static var tau: CGFloat {
        return .pi * 2
    }
}

extension Double {
    
    static func rand48() -> Double {
        srand48(Int(Date().timeIntervalSince1970))
        return drand48()
    }
    
    static var tau: Double {
        return .pi * 2
    }
}