Swift Perlin Noise iOS

View.swift

import UIKit
import GameKit

class View: UIView {
    let square_side = 5
    let height_pixels = 115
    let width_pixels = 80


    override func draw(_ rect: CGRect) {
        // Drawing code
        let context = UIGraphicsGetCurrentContext()!
        
        //let source: GKPerlinNoiseSource = GKPerlinNoiseSource(frequency: 10.0, octaveCount: 4, persistence: 0.5, lacunarity: 2.145, seed: 2)
        let source: GKRidgedNoiseSource = GKRidgedNoiseSource(frequency: 1.0, octaveCount: 4, lacunarity: 2.0, seed: 2)
        let noise: GKNoise = GKNoise(source)
        let map: GKNoiseMap = GKNoiseMap(noise, size: vector_double2(3.0, 3.0), origin: vector_double2(0, 0),
                                         sampleCount: vector_int2(Int32(width_pixels), Int32(height_pixels)), seamless: false)
        
        for coord_y in 0..<height_pixels {
            
            for coord_x in 0..<width_pixels {
                
                
                let vector: vector_int2 = vector_int2(Int32(coord_x), Int32(coord_y))
                let result = map.value(at: vector)

                
                var color: CGFloat = CGFloat(result * 0.5 + 0.5)

                
                if color < 0.0 { color = 0.0 }
                else if color > 1.0 { color = 1.0 }

                
                context.setFillColor(
                    red: 1.0,
                    green: 1.0,
                    blue: 1.0,
                    alpha: color);
                
                context.addRect(
                    CGRect(x: square_side * coord_x,
                           y: square_side * coord_y,
                           width: square_side,
                           height: square_side)
                )
                
                context.fillPath();
            
            }
            
        }
        

    }


}

ViewController.swift

import UIKit


class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let view : UIView = View()
        
        self.view = view;
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}