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koher/CGPointVector
Makes it easy to use CGPoint as vectors in Swift
.package(url: "https://github.com/koher/CGPointVector.git", from: "0.4.1")

CGPointVector

CGPointVector CI

CGPointVector provides the extension for arithmetic operations with CGPoint in Swift, which are convenient when CGPoint values are used as vectors.

let a = CGPoint(x: 1, y: 2), b = CGPoint(x: -3, y: 5)

let sum = a + b // (-2.0, 7.0)
let distance = (b - a).length // 5.0
let direction = (b - a).unit // (-0.8, 0.6)
let rotated = a * CGAffineTransform(rotationAngle: CGFloat.pi / 2) // (-2.0, 1.0)

Usage

import CGPointVector

let a = CGPoint(x: 3.0, y: -4.0)
let b = CGPoint(x: 2.0, y: -5.0)

let sum = a + b // (5.0, -9.0)
let length = a.length // 5.0
let distance = a.distance(from: b) // 1.4142135623731
let unitVector = a.unit // (0.6, -0.8)
let dotProduct = a.dot(b) // 26.0
let angle = a.angle(from: b) // 0.26299473168091936

License

The MIT License

GitHub

link
Stars: 33
Last commit: 3 weeks ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

Release Notes

Avoid overflow and underflow of `length` and `distance`
1 year ago
  • Replace x * x + y * y with hypot(x, y) (9feb2ead44f320705c89fbb8e3a40baa7e1a1fb7)
    • This prevents overflow and underflow during calculating length and distance. It makes it possible to pass the following tests.
XCTAssertEqual(CGPoint(x: .greatestFiniteMagnitude, y: 0.0).length, .greatestFiniteMagnitude)
XCTAssertEqual(CGPoint(x: 0.0, y: .leastNonzeroMagnitude).length, .leastNonzeroMagnitude)

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