//
//  UIImageWithAlpha.swift
//  Befund
//
//  Created by Artur Savitskiy on 12.09.22.
//  Copyright © 2022 MVZ Dr. Stein und Kollegen. All rights reserved.
//

import Foundation
extension UIImage {
    func image(alpha: CGFloat, targetSize: CGSize) -> UIImage? {
        let size = size
        
        let widthRatio  = targetSize.width  / size.width
        let heightRatio = targetSize.height / size.height
        
        // Figure out what our orientation is, and use that to form the rectangle
        var newSize: CGSize
        if(widthRatio > heightRatio) {
            newSize = CGSize(width: size.width * heightRatio, height: size.height * heightRatio)
        } else {
            newSize = CGSize(width: size.width * widthRatio, height: size.height * widthRatio)
        }
        let rect = CGRect(origin: .zero, size: newSize)
        UIGraphicsBeginImageContextWithOptions(newSize, false, scale)
        draw(in: rect, blendMode: .normal, alpha: alpha)
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return newImage
    }
}