Added zooming

- Added a starting scale var to keep track of the scale when the zooming starts - Added a new pinch gesture recognizer for the zoom - Added the method handlePinch for the zoom logic
scihant · May 12, 2018 · 9080505 · 9080505
1 parent c600c72
commit 9080505
Showing 1 changed file with 27 additions and 3 deletions.
diff --git a/Source/CTPanoramaView.swift b/Source/CTPanoramaView.swift
@@ -87,6 +87,8 @@ import ImageIO
         return tan(self.yFov/2 * .pi / 180.0) * 2 * self.radius
     }()
 
+    private var startScale = 0.0
+
     private var xFov: CGFloat {
         return yFov * self.bounds.width / self.bounds.height
     }
@@ -145,7 +147,7 @@ import ImageIO
         add(view: sceneView)
 
         scene.rootNode.addChildNode(cameraNode)
-        yFov = 70
+        yFov = 80
 
         sceneView.scene = scene
         sceneView.backgroundColor = UIColor.black
@@ -199,8 +201,11 @@ import ImageIO
         sceneView.gestureRecognizers?.removeAll()
 
         if method == .touch {
-                let panGestureRec = UIPanGestureRecognizer(target: self, action: #selector(handlePan(panRec:)))
-                sceneView.addGestureRecognizer(panGestureRec)
+            let panGestureRec = UIPanGestureRecognizer(target: self, action: #selector(handlePan(panRec:)))
+            sceneView.addGestureRecognizer(panGestureRec)
+
+            let pinchRec = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(pinchRec:)))
+            sceneView.addGestureRecognizer(pinchRec)
 
             if motionManager.isDeviceMotionActive {
                 motionManager.stopDeviceMotionUpdates()
@@ -277,6 +282,25 @@ import ImageIO
             reportMovement(CGFloat(-cameraNode.eulerAngles.y), xFov.toRadians())
         }
     }
+
+    @objc func handlePinch(pinchRec: UIPinchGestureRecognizer) {
+        if pinchRec.numberOfTouches != 2 {
+            return
+        }
+
+        let zoom = Double(pinchRec.scale)
+        switch pinchRec.state {
+        case .began:
+            startScale = cameraNode.camera!.yFov
+        case .changed:
+            let fov = startScale / zoom
+            if fov > 20 && fov < 80 {
+                cameraNode.camera!.yFov = fov
+            }
+        default:
+            break
+        }
+    }
 
     public override func layoutSubviews() {
         super.layoutSubviews()