space-ios/iOSClient/Library/WeScan/Extensions/CIRectangleFeature+Utils.swift

//
//  CIRectangleFeature+Utils.swift
//  WeScan
//
//  Created by Boris Emorine on 2/8/18.
//  Copyright © 2018 WeTransfer. All rights reserved.
//

import Foundation
import AVFoundation

extension CIRectangleFeature {
    
    /// The perimeter of the quadrilateral.
    func perimeter() -> CGFloat {
        return (topRight.x - topLeft.x) + (topRight.y - bottomRight.y) + (bottomRight.x - bottomLeft.x) + (topLeft.y - bottomLeft.y)
    }
    
    /// Checks whether the quadrilateral is withing a given distance of another quadrilateral.
    ///
    /// - Parameters:
    ///   - distance: The distance (threshold) to use for the condition to be met.
    ///   - rectangleFeature: The other rectangle to compare this instance with.
    /// - Returns: True if the given rectangle is within the given distance of this rectangle instance.
    func isWithin(_ distance: CGFloat, ofRectangleFeature rectangleFeature: CIRectangleFeature) -> Bool {
        
        let topLeftRect = topLeft.surroundingSquare(withSize: distance)
        if !topLeftRect.contains(rectangleFeature.topLeft) {
            return false
        }
        
        let topRightRect = topRight.surroundingSquare(withSize: distance)
        if !topRightRect.contains(rectangleFeature.topRight) {
            return false
        }
        
        let bottomRightRect = bottomRight.surroundingSquare(withSize: distance)
        if !bottomRightRect.contains(rectangleFeature.bottomRight) {
            return false
        }

        let bottomLeftRect = bottomLeft.surroundingSquare(withSize: distance)
        if !bottomLeftRect.contains(rectangleFeature.bottomLeft) {
            return false
        }
        
        return true
    }
    
    override open var description: String {
        return "topLeft: \(topLeft), topRight: \(topRight), bottomRight: \(bottomRight), bottomLeft: \(bottomLeft)"
    }
    
}