RegionTest.swift

import Foundation
import UIKit

class RegionTest {
    
    var region: CGPath!
    var points = [CGPoint]()
    
    init?() {
        guard let regionCoordinates = self.loadJson(filename:"pointlist"),
            let pathCoordinates = self.loadJson(filename: "coordinates") else {
                return nil
                
        }
        
        self.points = pathCoordinates
        let path = CGMutablePath()
        for point in regionCoordinates {
            path.move(to: point)
        }
        path.closeSubpath()
        self.region = path
    }
    
    func loadJson(filename fileName: String) -> [CGPoint]? {
        if let url = Bundle.main.url(forResource: fileName, withExtension: "json") {
            do {
                let data = try Data(contentsOf: url)
                let decoder = JSONDecoder()
                let jsonData = try decoder.decode([String].self, from: data)
                var points = [CGPoint]()
                for str in jsonData {
                    let split1 = str.split(separator: ",")
                    let latStr = split1[0]
                    let lonStr = split1[1]
                    let latSplit = latStr.split(separator: ":")
                    let lat = Float(latSplit[1])!
                    let lonSplit = lonStr.split(separator: ":")
                    let lon = Float(lonSplit[1])!
                    points.append(CGPoint(x:CGFloat(lat),y:CGFloat(lon)))
                }
                return points
            } catch {
                print("error:\(error)")
            }
        }
        return nil
    }
    
    func contains() -> Bool {
        var ret = true
        for point in points {
            if !region.contains(point) {
                ret = false
            }
        }
        return ret
    }
}