Gifu/Source/CGSizeExtension.swift

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Swift
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extension CGSize {
/// Calculates the aspect ratio of the size.
///
/// - returns: aspectRatio The aspect ratio of the size.
var aspectRatio: CGFloat {
if height == 0 { return 1 }
return width / height
}
/// Finds a new size constrained by a size keeping the aspect ratio.
///
/// - parameter size: The contraining size.
/// - returns: size A new size that fits inside the contraining size with the same aspect ratio.
func constrained(by size: CGSize) -> CGSize {
let aspectWidth = round(aspectRatio * size.height)
let aspectHeight = round(size.width / aspectRatio)
if aspectWidth > size.width {
return CGSize(width: size.width, height: aspectHeight)
} else {
return CGSize(width: aspectWidth, height: size.height)
}
}
/// Finds a new size filling the given size while keeping the aspect ratio.
///
/// - parameter size: The contraining size.
/// - returns: size A new size that fills the contraining size keeping the same aspect ratio.
func filling(size: CGSize) -> CGSize {
let aspectWidth = round(aspectRatio * size.height)
let aspectHeight = round(size.width / aspectRatio)
if aspectWidth > size.width {
return CGSize(width: aspectWidth, height: size.height)
} else {
return CGSize(width: size.width, height: aspectHeight)
}
}
}