/*
 Copyright 2016-present The Material Motion Authors. All Rights Reserved.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

import Foundation

extension ExtendableMotionObservable where T == CGFloat {

  /** Emits the incoming value + amount. */
  public func offset(by amount: CGFloat) -> MotionObservable<CGFloat> { return _map { $0 + amount } }

  /** Emits the incoming value * amount. */
  public func scaled(by amount: CGFloat) -> MotionObservable<CGFloat> { return _map { $0 * amount } }

  /** Emits the incoming value / amount. */
  public func normalized(by amount: CGFloat) -> MotionObservable<CGFloat> { return _map { $0 / amount } }

  /** Subtract the incoming value from the provided value. */
  public func subtracted(from value: CGFloat) -> MotionObservable<CGFloat> { return _map { value - $0 } }
}

/*
 Copyright 2016-present The Material Motion Authors. All Rights Reserved.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

import Foundation

extension ExtendableMotionObservable where T == CGFloat {

  /** Emits the incoming value + amount. */
  public func offset(by amount: CGFloat) -> MotionObservable<CGFloat> { return _map { $0 + amount } }

  /** Emits the incoming value * amount. */
  public func scaled(by amount: CGFloat) -> MotionObservable<CGFloat> { return _map { $0 * amount } }

  /** Emits the incoming value / amount. */
  public func normalized(by amount: CGFloat) -> MotionObservable<CGFloat> { return _map { $0 / amount } }

  /** Subtract the incoming value from the provided value. */
  public func subtracted(from value: CGFloat) -> MotionObservable<CGFloat> { return _map { value - $0 } }
}

extension ExtendableMotionObservable where T == CGPoint {

  /** Emits the incoming value / amount. */
  public func normalized(by amount: CGSize) -> MotionObservable<CGPoint> {
    return _map {
      return CGPoint(x: $0.x / amount.width,
                     y: $0.y / amount.height)
    }
  }
}

Add normalized operator for point/size.
Add normalized operator for point/size.

Summary: This operator is useful for calculating anchor point position within a view.

Reviewers: O2 Material Motion, #material_motion, O4 Material Apple platform reviewers, chuga

Reviewed By: O4 Material Apple platform reviewers, chuga

Subscribers: chuga

Tags: #material_motion

Differential Revision: http://codereview.cc/D2463
