64 lines
2.7 KiB
Swift
64 lines
2.7 KiB
Swift
/**
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* Copyright (c) 2019 Razeware LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
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* distribute, sublicense, create a derivative work, and/or sell copies of the
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* Software in any work that is designed, intended, or marketed for pedagogical or
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* instructional purposes related to programming, coding, application development,
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* or information technology. Permission for such use, copying, modification,
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* merger, publication, distribution, sublicensing, creation of derivative works,
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* or sale is expressly withheld.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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import UIKit
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extension ViewController {
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static var previousScale: CGFloat = 1
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func addGestureRecognizer(to view: UIView) {
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let pan = UIPanGestureRecognizer(target: self,
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action: #selector(handlePan(gesture:)))
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view.addGestureRecognizer(pan)
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let pinch = UIPinchGestureRecognizer(target: self,
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action: #selector(handlePinch(gesture:)))
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view.addGestureRecognizer(pinch)
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}
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@objc func handlePan(gesture: UIPanGestureRecognizer) {
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let translation = float2(Float(gesture.translation(in: gesture.view).x),
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Float(gesture.translation(in: gesture.view).y))
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renderer?.rotateUsing(translation: translation)
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gesture.setTranslation(.zero, in: gesture.view)
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}
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@objc func handlePinch(gesture: UIPinchGestureRecognizer) {
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let sensitivity: Float = 0.8
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renderer?.zoomUsing(delta: gesture.scale-ViewController.previousScale,
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sensitivity: sensitivity)
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ViewController.previousScale = gesture.scale
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if gesture.state == .ended {
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ViewController.previousScale = 1
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}
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}
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}
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