Better format, add debug mode

Author: Cesar Vargas Casaseca

Sample/Sample/ViewController.swift

@@ -59,6 +59,16 @@ class ViewController: UIViewController {
     facialExpressionDetectorViewController.didMove(toParent: self)
   }
 
+  private func changeFacialExpressionMinimumValidCoefficient() {
+    let changingAnalyzer = FacialExpressionAnalyzer(facialExpression: FacialExpression.mouthSmileLeft, blendShapeLocation: .mouthSmileLeft, minimumValidCoefficient: 0.2)
+
+    guard let index = facialExpressionDetectorViewController.analyzers.firstIndex(where: { $0.facialExpression == FacialExpression.mouthSmileLeft }) else {
+      return
+    }
+
+    facialExpressionDetectorViewController.analyzers[index] = changingAnalyzer
+  }
+
   private func addMoreFacialExpressionsToBeDetected() {
     facialExpressionDetectorViewController.analyzers.append(FacialExpressionAnalyzer(facialExpression: FacialExpression.eyeWideLeft, blendShapeLocation: .eyeWideLeft, minimumValidCoefficient: 0.6))
   }

Sources/Wink/FacialExpression.swift

@@ -31,8 +31,8 @@ extension FacialExpression {
   static let test = FacialExpression(rawValue: "")
 }
 
-public struct FacialExpressionAnalyzer {
-  let facialExpression: FacialExpression
+public struct FacialExpressionAnalyzer: Equatable {
+  public let facialExpression: FacialExpression
   let blendShapeLocation: ARFaceAnchor.BlendShapeLocation
   let minimumValidCoefficient: Decimal
 

Sources/Wink/FacialExpressionDetectorViewController.swift

@@ -10,12 +10,16 @@ import UIKit
 import ARKit
 import Combine
 
-public class FacialExpressionDetectorViewController: UIViewController, ARSCNViewDelegate {
+public class FacialExpressionDetectorViewController: UIViewController {
   var sceneView: ARSCNView!
 
+  /// Array of `FacialExpressionAnalyzer` responsible of detecting the new expressions
   public var analyzers = DefaultFacialExpressionAnalyzersProvider().defaultFacialExpressionAnalyzers()
-
+  /// When enabled, debug elements are shown in the camera view such as node lines and statistics. Default is `false`
+  public var debugMode = false
+  /// This publisher is updated with a new array of `FacialExpression` each time they are retrived
   lazy public var facialExpressionPublisher: AnyPublisher<[FacialExpression], Never> = facialExpressionSubject.eraseToAnyPublisher()
+  
   private let facialExpressionSubject: PassthroughSubject<[FacialExpression], Never> = PassthroughSubject<[FacialExpression], Never>()
 
   public override func viewDidLoad() {
@@ -29,7 +33,10 @@ public class FacialExpressionDetectorViewController: UIViewController, ARSCNView
     adjustSceneViewConstraints()
 
     sceneView.delegate = self
-    sceneView.showsStatistics = true
+
+    if debugMode {
+      sceneView.showsStatistics = true
+    }
   }
 
   private func checkFaceTrackingSupport() {
@@ -59,19 +66,7 @@ public class FacialExpressionDetectorViewController: UIViewController, ARSCNView
     sceneView.session.pause()
   }
 
-  public func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
-        let faceMesh = ARSCNFaceGeometry(device: sceneView.device!)
-        let node = SCNNode(geometry: faceMesh)
-        node.geometry?.firstMaterial?.fillMode = .lines
-        return node
-    }
 
-  public func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
-    if let faceAnchor = anchor as? ARFaceAnchor, let faceGeometry = node.geometry as? ARSCNFaceGeometry {
-      faceGeometry.update(from: faceAnchor.geometry)
-      detectFacialExpression(from: faceAnchor)
-    }
-  }
 
   func detectFacialExpression(from anchor: ARFaceAnchor) {
     let facialExpressions: [FacialExpression] = analyzers.compactMap {
@@ -83,3 +78,24 @@ public class FacialExpressionDetectorViewController: UIViewController, ARSCNView
     facialExpressionSubject.send(facialExpressions)
   }
 }
+
+extension FacialExpressionDetectorViewController: ARSCNViewDelegate {
+  public func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
+    let faceMesh = ARSCNFaceGeometry(device: sceneView.device!)
+    let node = SCNNode(geometry: faceMesh)
+
+    if debugMode {
+      node.geometry?.firstMaterial?.fillMode = .lines
+
+    }
+
+    return node
+  }
+
+  public func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
+    if let faceAnchor = anchor as? ARFaceAnchor, let faceGeometry = node.geometry as? ARSCNFaceGeometry {
+      faceGeometry.update(from: faceAnchor.geometry)
+      detectFacialExpression(from: faceAnchor)
+    }
+  }
+}