updated pixelThreshold range

Develop

Example/Example/Base.lproj/Main.storyboard

@@ -43,7 +43,7 @@
                                 <rect key="frame" x="20" y="93" width="374" height="32"/>
                                 <segments>
                                     <segment title="Orange"/>
-                                    <segment title="Magenta"/>
+                                    <segment title="Red"/>
                                     <segment title="Green"/>
                                     <segment title="Brown"/>
                                     <segment title="Cyan"/>

Example/Example/ViewController.swift

@@ -30,17 +30,12 @@ class ViewController: UIViewController {
   @IBOutlet weak var messageLabel: UILabel!
   var coder = RCCoder()
   var image = RCImage(message: "")
-  let colors: [[UIColor]] = [[.orange, .gray], [.orange, .magenta], [.systemGreen, .systemBlue], [.orange, .brown], [.purple, .cyan]]
+  let colors: [[UIColor]] = [[.orange, .magenta], [.systemPink, .systemTeal], [.systemTeal, .systemGreen], [.orange, .brown], [.purple, .cyan]]
   var isScanningFromLibrary = false
 }
 
 extension ViewController {
   
-  override func viewDidLoad() {
-    super.viewDidLoad()
-    image.isTransparent = true
-  }
-  
   @IBAction func scanImage(_ sender: Any) {
     isScanningFromLibrary = true
     let vc = UIImagePickerController()

RoundCode.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'RoundCode'
-  s.version          = '1.1.0'
+  s.version          = '1.1.1'
   s.summary          = 'Facebook messenger style custom barcode.'
   s.description      = <<-DESC
                      Encode and decode data into custom stylish barcode.

Sources/Internal/RCConstants.swift

@@ -28,5 +28,5 @@ struct RCConstants {
   static let dotSizeScale: CGFloat = 0.08
   static let dotPatterns: [CGFloat] = [6, 4, 2]
   static let dotPointRange = (Float(1.3)...Float(2.5))
-  static let pixelThreshold = 180
+  static let pixelThreshold = (0...180)
 }

Sources/Internal/RCError.swift

@@ -27,6 +27,7 @@ public enum RCError: String, LocalizedError {
   case longText
   case decoding
   case wrongImageSize
+  case wrongColors
 
   public var errorDescription: String? {
     switch self {
@@ -38,6 +39,8 @@ public enum RCError: String, LocalizedError {
         return "Error decoding"
       case .wrongImageSize:
         return "Error decoding. Image width and height must be a equal"
+      case .wrongColors:
+        return "The tint colors should be in a range of \(RCConstants.pixelThreshold) grayscale with 1.0 alpha"
     }
   }
 }

Sources/Internal/RCImageDecoder.swift

@@ -57,7 +57,7 @@ extension RCImageDecoder {
     let transform = calculateTransform(from: points)
     let mapper = RCPointMapper(transform: transform, size: size)
     let locations = mapper.map(points: calculateBitLocations())
-    let bits = locations.map { data[Int($0.x), Int($0.y)] > RCConstants.pixelThreshold ? RCBit.zero : RCBit.one }
+    let bits = locations.map { RCConstants.pixelThreshold.contains(Int(data[Int($0.x), Int($0.y)])) ? RCBit.one : RCBit.zero }
     return bits
   }
   
@@ -75,13 +75,13 @@ extension RCImageDecoder {
   private func scanControlPoint(for data: PixelContainer, region: (x: Int, y: Int), side: Side) throws -> CGPoint {
     
     func scan(region: (x: Int, y: Int, size: Int), data: PixelContainer, coordinate: (Int) -> (x: Int, y: Int), comparison: (PixelPattern, (x: Int, y: Int)) -> Bool) -> [PixelPattern] {
-      var lastPattern = PixelPattern(bit: data[region.x, region.y] > RCConstants.pixelThreshold ? RCBit.zero : RCBit.one, x: region.x, y: region.y, count: 0)
+      var lastPattern = PixelPattern(bit: RCConstants.pixelThreshold.contains(Int(data[region.x, region.y])) ? RCBit.one : RCBit.zero, x: region.x, y: region.y, count: 0)
       var pixelPatterns = [lastPattern]
       var count = 0
       let maxSize = region.size * region.size
       while count < maxSize {
         let coordinate = coordinate(count)
-        let bit = data[coordinate.x, coordinate.y] > RCConstants.pixelThreshold ? RCBit.zero : RCBit.one
+        let bit = RCConstants.pixelThreshold.contains(Int(data[coordinate.x, coordinate.y])) ? RCBit.one : RCBit.zero
         if comparison(lastPattern, coordinate), lastPattern.bit == bit {
           lastPattern.count += 1
           pixelPatterns[pixelPatterns.count - 1] = lastPattern

Sources/Public/RCCoder.swift

@@ -54,6 +54,16 @@ public extension RCCoder {
   func validate(_ text: String) -> Bool {
     configuration.validate(text)
   }
+  
+  func validateForBlackBackground(colors: [UIColor]) -> Bool {
+    colors.allSatisfy { color in
+      var white: CGFloat = 0
+      var alpha: CGFloat = 0
+      guard color.getWhite(&white, alpha: &alpha) else { return false }
+      guard alpha == 1.0 else { return false }
+      return RCConstants.pixelThreshold.contains(Int(white * 255))
+    }
+  }
 }
 
 extension RCCoder {

Sources/Public/RCImage.swift

@@ -28,7 +28,7 @@ public struct RCImage {
   public var size = CGFloat(300)
   public var tintColors: [UIColor] = [.orange, .magenta]
   public var attachmentImage: UIImage?
-  public var isTransparent = false
+  public var isTransparent = true
   public var gradientType = GradientType.linear(angle: CGFloat.pi / 4)
   public var contentInsets = UIEdgeInsets(top: 8, left: 8, bottom: 8, right: 8)