add mustache sample

sample/mustache/Rakefile

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+$:.unshift('../../lib')
+require 'motion/project'
+
+#ENV['debug'] ||= '0' # Because the REPL cannot be loaded with CoreImage yet.
+
+Motion::Project::App.setup do |app|
+  # Use `rake config' to see complete project settings.
+  app.name = 'Mustache'
+  app.frameworks += ['QuartzCore', 'CoreImage']
+end

sample/mustache/app/app_delegate.rb

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+class AppDelegate
+  def application(application, didFinishLaunchingWithOptions:launchOptions)
+    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
+    @window.rootViewController = MustacheViewController.alloc.init
+    @window.rootViewController.wantsFullScreenLayout = true
+    @window.makeKeyAndVisible
+    return true
+  end
+end

sample/mustache/app/mustache_view_controller.rb

@@ -0,0 +1,57 @@
+class MustacheViewController < UIViewController
+  def loadView
+    self.view = UIImageView.alloc.init
+    @debug_face = false # Set to true to debug face features.
+  end
+
+  def viewDidLoad
+    view.image = UIImage.imageNamed('matz.jpg')
+    view.contentMode = UIViewContentModeScaleAspectFit
+  end
+
+  def viewDidAppear(animated)
+    # CoreImage used a coordinate system which is flipped on the Y axis
+    # compared to UIKit. Also, a UIImageView can return an image larger than
+    # itself. To properly translate points, we use an affine transform.
+    transform = CGAffineTransformMakeScale(view.bounds.size.width / view.image.size.width, -1 * (view.bounds.size.height / view.image.size.height))
+    transform = CGAffineTransformTranslate(transform, 0, -view.image.size.height)
+
+    @detector ||= CIDetector.detectorOfType CIDetectorTypeFace, context:nil, options: { CIDetectorAccuracy: CIDetectorAccuracyHigh }
+    image = CIImage.imageWithCGImage(view.image.CGImage)
+    @detector.featuresInImage(image).each do |feature|
+      next unless feature.hasMouthPosition and feature.hasLeftEyePosition and feature.hasRightEyePosition
+
+      if @debug_face
+        [feature.leftEyePosition,feature.rightEyePosition,feature.mouthPosition].each do |pt|
+          v = UIView.alloc.initWithFrame CGRectMake(0, 0, 20, 20)
+          v.backgroundColor = UIColor.greenColor.colorWithAlphaComponent(0.2)
+          pt = CGPointApplyAffineTransform(pt, transform)
+          v.center = pt
+          view.addSubview(v)
+        end
+      end
+
+      mustacheView = UIImageView.alloc.init
+      mustacheView.image = UIImage.imageNamed('mustache')
+      mustacheView.contentMode = UIViewContentModeScaleAspectFit
+
+      w = feature.bounds.size.width
+      h = feature.bounds.size.height / 5
+      x = (feature.mouthPosition.x + (feature.leftEyePosition.x + feature.rightEyePosition.x) / 2) / 2 - w / 2
+      y = feature.mouthPosition.y
+
+      mustacheView.frame = CGRectApplyAffineTransform([[x, y], [w, h]], transform)
+
+      mustacheAngle = Math.atan2(feature.leftEyePosition.x - feature.rightEyePosition.x, feature.leftEyePosition.y - feature.rightEyePosition.y) + Math::PI/2
+      mustacheView.transform = CGAffineTransformMakeRotation(mustacheAngle) 
+ 
+      view.addSubview(mustacheView)
+    end
+  end
+
+  def shouldAutorotateToInterfaceOrientation(*)
+    view.subviews.each { |v| v.removeFromSuperview }
+    viewDidAppear(true)
+    true
+  end
+end