mastodon-ios/Mastodon/Vender/TransitioningMath.swift

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/*
Copyright (C) 2016 Apple Inc. All Rights Reserved.
See LICENSE.txt for this samples licensing information
Abstract:
Convenience math operators
*/
import QuartzCore
func clip<T : Comparable>(_ x0: T, _ x1: T, _ v: T) -> T {
return max(x0, min(x1, v))
}
func lerp<T : FloatingPoint>(_ v0: T, _ v1: T, _ t: T) -> T {
return v0 + (v1 - v0) * t
}
func -(lhs: CGPoint, rhs: CGPoint) -> CGVector {
return CGVector(dx: lhs.x - rhs.x, dy: lhs.y - rhs.y)
}
func -(lhs: CGPoint, rhs: CGVector) -> CGPoint {
return CGPoint(x: lhs.x - rhs.dx, y: lhs.y - rhs.dy)
}
func -(lhs: CGVector, rhs: CGVector) -> CGVector {
return CGVector(dx: lhs.dx - rhs.dx, dy: lhs.dy - rhs.dy)
}
func +(lhs: CGPoint, rhs: CGPoint) -> CGVector {
return CGVector(dx: lhs.x + rhs.x, dy: lhs.y + rhs.y)
}
func +(lhs: CGPoint, rhs: CGVector) -> CGPoint {
return CGPoint(x: lhs.x + rhs.dx, y: lhs.y + rhs.dy)
}
func +(lhs: CGVector, rhs: CGVector) -> CGVector {
return CGVector(dx: lhs.dx + rhs.dx, dy: lhs.dy + rhs.dy)
}
func *(left: CGVector, right:CGFloat) -> CGVector {
return CGVector(dx: left.dx * right, dy: left.dy * right)
}
extension CGPoint {
var vector: CGVector {
return CGVector(dx: x, dy: y)
}
}
extension CGVector {
var magnitude: CGFloat {
return sqrt(dx*dx + dy*dy)
}
var point: CGPoint {
return CGPoint(x: dx, y: dy)
}
func apply(transform t: CGAffineTransform) -> CGVector {
return point.applying(t).vector
}
}