space-ios/iOSClient/Scan/WeScan/Extensions/UIImage+Utils.swift

//
//  UIImage+Utils.swift
//  WeScan
//
//  Created by Bobo on 5/25/18.
//  Copyright © 2018 WeTransfer. All rights reserved.
//

import Foundation

extension UIImage {
    
    /// Draws a new cropped and scaled (zoomed in) image.
    ///
    /// - Parameters:
    ///   - point: The center of the new image.
    ///   - scaleFactor: Factor by which the image should be zoomed in.
    ///   - size: The size of the rect the image will be displayed in.
    /// - Returns: The scaled and cropped image.
    func scaledImage(atPoint point: CGPoint, scaleFactor: CGFloat, targetSize size: CGSize) -> UIImage? {
        guard let cgImage = self.cgImage else {
            return nil
        }
        
        let scaledSize = CGSize(width: size.width / scaleFactor, height: size.height / scaleFactor)
        
        guard let croppedImage = cgImage.cropping(to: CGRect(x: point.x - scaledSize.width / 2.0, y: point.y - scaledSize.height / 2.0, width: scaledSize.width, height: scaledSize.height)) else {
            return nil
        }
        
        return UIImage(cgImage: croppedImage)
    }
    
}