iOS Swift Game Development Cookbook by Jonathon Manning

Author:Jonathon Manning
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2018-09-26T16:00:00+00:00

let length = sqrt(myVector.dx * myVector.dx + myVector.dy * myVector.dy) // length = 3.60555127546399

You can use extensions to add convenience methods to types in Swift. This includes the CGVector type—so, if you wanted to be able to access a vector’s length using a property instead of having to type out the equation every time, you can add it like so:

// Add a read-only property called 'length' to all CGVectors extension CGVector { var length : Double { get { let dx = Double(self.dx) let dy = Double(self.dy) return sqrt(dx * dx + dy * dy) } } } // Use it like this: print(myVector.length)

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