fittingpath.swift

/// Takes an absolute path and fits it inside the proposed rectangle.
struct FittingShape: Shape {
    var absolutePath: Path
    
    func path(in rect: CGRect) -> Path {
        let p = absolutePath
        let boundingRect = p.boundingRect
        let scale = min(rect.width/boundingRect.width, rect.height/boundingRect.height)
        let scaled = p.applying(.init(scaleX: scale, y: scale))
        let scaledBoundingRect = scaled.boundingRect
        let offsetX = scaledBoundingRect.midX - rect.midX
        let offsetY = scaledBoundingRect.midY - rect.midY
        return scaled.offsetBy(dx: -offsetX, dy: -offsetY)
    }
}