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Merge pull request Khan#43 from Khan/camera-layers
Camera layers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| var cameraLayer = new CameraLayer() | ||
| cameraLayer.width = Layer.root.width * 0.5 | ||
| cameraLayer.height = Layer.root.height * 0.5 | ||
| cameraLayer.cameraPosition = CameraPosition.Front | ||
| cameraLayer.x = Layer.root.x | ||
| cameraLayer.y = Layer.root.y | ||
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| var flipButton = new TextLayer() | ||
| flipButton.fontName = "Futura" | ||
| flipButton.fontSize = 30 | ||
| flipButton.text = "Flip" | ||
| flipButton.x = Layer.root.x | ||
| flipButton.y = 100 | ||
| flipButton.animators.alpha.springBounciness = 0 | ||
| flipButton.animators.alpha.springSpeed = 20 | ||
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| Layer.root.touchBeganHandler = function() { | ||
| flipButton.animators.alpha.target = 0.5 | ||
| } | ||
| Layer.root.touchEndedHandler = function(touchSequence) { | ||
| cameraLayer.cameraPosition = (cameraLayer.cameraPosition === CameraPosition.Front) ? CameraPosition.Back : CameraPosition.Front | ||
| flipButton.animators.alpha.target = 1.0 | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // | ||
| // CameraLayer.swift | ||
| // Prototope | ||
| // | ||
| // Created by Andy Matuschak on 3/5/15. | ||
| // Copyright (c) 2015 Khan Academy. All rights reserved. | ||
| // | ||
|
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| import Foundation | ||
| import AVFoundation | ||
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| /** A layer that shows the output of one of the device's cameras. Defaults to using the back camera. */ | ||
| public class CameraLayer: Layer { | ||
| public enum CameraPosition: Printable { | ||
| /** The device's front-facing camera. */ | ||
| case Front | ||
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| /** The device's back-facing camera. */ | ||
| case Back | ||
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| private var avCaptureDevicePosition: AVCaptureDevicePosition { | ||
| switch self { | ||
| case .Front: return .Front | ||
| case .Back: return .Back | ||
| } | ||
| } | ||
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| public var description: String { | ||
| switch self { | ||
| case .Front: return "Front" | ||
| case .Back: return "Back" | ||
| } | ||
| } | ||
| } | ||
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| /** Selects which camera to use. */ | ||
| public var cameraPosition: CameraPosition { | ||
| didSet { updateSession() } | ||
| } | ||
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| private var captureSession: AVCaptureSession? | ||
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| public init(parent: Layer? = Layer.root, name: String? = nil) { | ||
| self.cameraPosition = .Back | ||
| super.init(parent: parent, name: name, viewClass: CameraView.self) | ||
| updateSession() | ||
| } | ||
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| deinit { | ||
| captureSession?.stopRunning() | ||
| } | ||
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| private func updateSession() { | ||
| // Find device matching camera setting | ||
| let devices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo) as! [AVCaptureDevice] | ||
| if let device = filter(devices, { device in return device.position == self.cameraPosition.avCaptureDevicePosition }).first { | ||
| var error: NSError? | ||
| if let input = AVCaptureDeviceInput(device: device, error: &error) { | ||
| captureSession?.stopRunning() | ||
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| captureSession = AVCaptureSession() | ||
| captureSession!.addInput(input) | ||
| captureSession!.startRunning() | ||
| cameraLayer.session = captureSession! | ||
| cameraLayer.videoGravity = AVLayerVideoGravityResizeAspectFill | ||
| } else { | ||
| Environment.currentEnvironment!.exceptionHandler("Couldn't create camera device: \(error)") | ||
| } | ||
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| } else { | ||
| Environment.currentEnvironment!.exceptionHandler("Could not find a \(cameraPosition.description.lowercaseString) camera on this device") | ||
| } | ||
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| } | ||
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| private var cameraLayer: AVCaptureVideoPreviewLayer { | ||
| return (self.view as! CameraView).layer as! AVCaptureVideoPreviewLayer | ||
| } | ||
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| /** Underlying camera view class. */ | ||
| private class CameraView: UIView { | ||
| override class func layerClass() -> AnyClass { | ||
| return AVCaptureVideoPreviewLayer.self | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // | ||
| // CameraLayerBridge.swift | ||
| // Prototope | ||
| // | ||
| // Created by Andy Matuschak on 2/15/15. | ||
| // Copyright (c) 2015 Khan Academy. All rights reserved. | ||
| // | ||
|
|
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| import Foundation | ||
| import Prototope | ||
| import JavaScriptCore | ||
|
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| @objc public protocol CameraLayerJSExport: JSExport { | ||
| var cameraPosition: JSValue { get set } | ||
| } | ||
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| @objc public class CameraLayerBridge: LayerBridge, CameraLayerJSExport, BridgeType { | ||
| var cameraLayer: CameraLayer { return layer as! CameraLayer } | ||
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| public override class func addToContext(context: JSContext) { | ||
| context.setObject(self, forKeyedSubscript: "CameraLayer") | ||
| } | ||
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| public required init?(args: NSDictionary) { | ||
| let parentLayer = (args["parent"] as! LayerBridge?)?.layer | ||
| let cameraLayer = CameraLayer(parent: parentLayer, name: (args["name"] as! String?)) | ||
| super.init(cameraLayer) | ||
| } | ||
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| public var cameraPosition: JSValue { | ||
| get { return CameraPositionBridge.encodeCameraPosition(cameraLayer.cameraPosition, inContext: JSContext.currentContext()) } | ||
| set { cameraLayer.cameraPosition = CameraPositionBridge.decodeCameraPosition(newValue) } | ||
| } | ||
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| } | ||
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| public class CameraPositionBridge: NSObject, BridgeType { | ||
| enum RawCameraPosition: Int { | ||
| case Front = 0 | ||
| case Back = 1 | ||
| } | ||
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| public class func addToContext(context: JSContext) { | ||
| let alignmentObject = JSValue(newObjectInContext: context) | ||
| alignmentObject.setObject(RawCameraPosition.Front.rawValue, forKeyedSubscript: "Front") | ||
| alignmentObject.setObject(RawCameraPosition.Back.rawValue, forKeyedSubscript: "Back") | ||
| context.setObject(alignmentObject, forKeyedSubscript: "CameraPosition") | ||
| } | ||
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| public class func encodeCameraPosition(cameraPosition: Prototope.CameraLayer.CameraPosition, inContext context: JSContext) -> JSValue { | ||
| var rawCameraPosition: RawCameraPosition | ||
| switch cameraPosition { | ||
| case .Front: rawCameraPosition = .Front | ||
| case .Back: rawCameraPosition = .Back | ||
| } | ||
| return JSValue(int32: Int32(rawCameraPosition.rawValue), inContext: context) | ||
| } | ||
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| public class func decodeCameraPosition(bridgedCameraPosition: JSValue) -> Prototope.CameraLayer.CameraPosition! { | ||
| if let rawCameraPosition = RawCameraPosition(rawValue: Int(bridgedCameraPosition.toInt32())) { | ||
| switch rawCameraPosition { | ||
| case .Front: return .Front | ||
| case .Back: return .Back | ||
| } | ||
| } else { | ||
| Environment.currentEnvironment!.exceptionHandler("Unknown camera position: \(bridgedCameraPosition)") | ||
| return nil | ||
| } | ||
| } | ||
| } | ||
|
|
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