Lorenz Attractor in Swift

gistfile1.swift

// Swift Playground example of the Lorenz Attractor
// Change platform to OS X when opening Playground.
// alt + cmd + enter to show Assistant editor and see resulting image.

import Cocoa
import XCPlayground

let width = 600.0, height = 500.0

class CustomView: NSView {
    override init(frame: NSRect) {
        super.init(frame: frame)
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder);
    }

    override func drawRect(dirtyRect: NSRect) {
        lorentzAttractor()
    }
    
    func lorentzAttractor() {
        var x = 0.1 , y = 0.0, z = 0.0, t = 0.0
        for i in 1...4242 {
            let x1 = x + 0.01 * 10 * (y - x)
            let y1 = y + 0.01 * (x * (28 - z) - y)
            let z1 = z + 0.01 * (x * y - 2.66 * z)
            x = x1
            y = y1
            z = z1
            
            let phys_x = width / 2 + 12 * x
            let phys_y = 25 + 8 * z
            
            NSRectFill(NSMakeRect(CGFloat(phys_x), CGFloat(phys_y), 1, 1))
        }
    }
}

XCPShowView("Lorenz Attractor", CustomView(frame:
    NSRect(x: 0, y: 0, width: width, height: height)))

As a Cocoa application https://github.com/jonelf/Lorenz-Attractor/tree/master