53 lines
2.1 KiB
Swift
53 lines
2.1 KiB
Swift
//
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// Copyright (c) 2020 Touch Instinct
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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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// 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 UIPanGestureRecognizer {
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func projectedLocation(decelerationRate: UIScrollView.DecelerationRate) -> CGPoint {
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let velocityOffset = velocity(in: view).projectedOffset(decelerationRate: .normal)
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let projectedLocation = location(in: view) + velocityOffset
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return projectedLocation
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}
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}
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extension CGPoint {
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func projectedOffset(decelerationRate: UIScrollView.DecelerationRate) -> CGPoint {
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return CGPoint(x: x.projectedOffset(decelerationRate: decelerationRate),
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y: y.projectedOffset(decelerationRate: decelerationRate))
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}
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}
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extension CGFloat {
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func projectedOffset(decelerationRate: UIScrollView.DecelerationRate) -> CGFloat {
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let multiplier = 1 / (1 - decelerationRate.rawValue) / 1000
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return self * multiplier
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}
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}
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extension CGPoint {
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static func +(left: CGPoint, right: CGPoint) -> CGPoint {
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return CGPoint(x: left.x + right.x,
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y: left.y + right.y)
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}
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}
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