67 lines
1.5 KiB
Swift
67 lines
1.5 KiB
Swift
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/*
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Copyright (C) 2016 Apple Inc. All Rights Reserved.
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See LICENSE.txt for this sample’s licensing information
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Abstract:
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Convenience math operators
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*/
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import QuartzCore
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func clip<T : Comparable>(_ x0: T, _ x1: T, _ v: T) -> T {
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return max(x0, min(x1, v))
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}
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func lerp<T : FloatingPoint>(_ v0: T, _ v1: T, _ t: T) -> T {
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return v0 + (v1 - v0) * t
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}
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func -(lhs: CGPoint, rhs: CGPoint) -> CGVector {
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return CGVector(dx: lhs.x - rhs.x, dy: lhs.y - rhs.y)
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}
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func -(lhs: CGPoint, rhs: CGVector) -> CGPoint {
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return CGPoint(x: lhs.x - rhs.dx, y: lhs.y - rhs.dy)
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}
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func -(lhs: CGVector, rhs: CGVector) -> CGVector {
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return CGVector(dx: lhs.dx - rhs.dx, dy: lhs.dy - rhs.dy)
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}
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func +(lhs: CGPoint, rhs: CGPoint) -> CGVector {
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return CGVector(dx: lhs.x + rhs.x, dy: lhs.y + rhs.y)
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}
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func +(lhs: CGPoint, rhs: CGVector) -> CGPoint {
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return CGPoint(x: lhs.x + rhs.dx, y: lhs.y + rhs.dy)
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}
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func +(lhs: CGVector, rhs: CGVector) -> CGVector {
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return CGVector(dx: lhs.dx + rhs.dx, dy: lhs.dy + rhs.dy)
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}
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func *(left: CGVector, right:CGFloat) -> CGVector {
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return CGVector(dx: left.dx * right, dy: left.dy * right)
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}
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extension CGPoint {
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var vector: CGVector {
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return CGVector(dx: x, dy: y)
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}
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}
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extension CGVector {
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var magnitude: CGFloat {
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return sqrt(dx*dx + dy*dy)
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}
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var point: CGPoint {
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return CGPoint(x: dx, y: dy)
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}
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func apply(transform t: CGAffineTransform) -> CGVector {
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return point.applying(t).vector
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}
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}
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