O2OA/o2ios/O2Platform/Extension/UIImage+Extension.swift

//
//  UIImage+Extension.swift
//  O2Platform
//
//  Created by FancyLou on 2018/11/21.
//  Copyright © 2018 zoneland. All rights reserved.
//

import UIKit

extension UIImage {
    
    /// EZSE: scales image
    public class func scaleTo(image: UIImage, w: CGFloat, h: CGFloat) -> UIImage {
        let newSize = CGSize(width: w, height: h)
        UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0)
        image.draw(in: CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))
        let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()
        return newImage
    }

    func o2_aspectFitRectForSize(_ size: CGSize) -> CGRect {
        let targetAspect: CGFloat = size.width / size.height
        let sourceAspect: CGFloat = self.size.width / self.size.height
        var rect: CGRect = CGRect.zero
        
        if targetAspect > sourceAspect {
            rect.size.height = size.height
            rect.size.width = ceil(rect.size.height * sourceAspect)
            rect.origin.x = ceil((size.width - rect.size.width) * 0.5)
        } else {
            rect.size.width = size.width
            rect.size.height = ceil(rect.size.width / sourceAspect)
            rect.origin.y = ceil((size.height - rect.size.height) * 0.5)
        }
        
        return rect
    }
}