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2d Vector Arithmetics Swift 5
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| // | |
| // | |
| // CGVectorArithmetics.swift | |
| // | |
| // Created by fewlinesofcode.com on 2/6/19. | |
| // Copyright © 2019 fewlinesofcode.com All rights reserved. | |
| // | |
| import Foundation | |
| import CoreGraphics | |
| extension CGVector: AdditiveArithmetic { | |
| // Vector addition | |
| public static func + (left: CGVector, right: CGVector) -> CGVector { | |
| return CGVector(dx: left.dx + right.dx, dy: left.dy + right.dy) | |
| } | |
| // Vector subtraction | |
| public static func - (left: CGVector, right: CGVector) -> CGVector { | |
| return left + (-right) | |
| } | |
| // Vector addition assignment | |
| public static func += (left: inout CGVector, right: CGVector) { | |
| left = left + right | |
| } | |
| // Vector subtraction assignment | |
| public static func -= (left: inout CGVector, right: CGVector) { | |
| left = left - right | |
| } | |
| // Vector negation | |
| public static prefix func - (vector: CGVector) -> CGVector { | |
| return CGVector(dx: -vector.dx, dy: -vector.dy) | |
| } | |
| } | |
| infix operator * : MultiplicationPrecedence | |
| infix operator / : MultiplicationPrecedence | |
| infix operator • : MultiplicationPrecedence | |
| extension CGVector { | |
| // Scalar-vector multiplication | |
| public static func * (left: CGFloat, right: CGVector) -> CGVector { | |
| return CGVector(dx: right.dx * left, dy: right.dy * left) | |
| } | |
| public static func * (left: CGVector, right: CGFloat) -> CGVector { | |
| return CGVector(dx: left.dx * right, dy: left.dy * right) | |
| } | |
| // Vector-scalar division | |
| public static func / (left: CGVector, right: CGFloat) -> CGVector { | |
| guard right != 0 else { fatalError("Division by zero") } | |
| return CGVector(dx: left.dx / right, dy: left.dy / right) | |
| } | |
| // Vector-scalar division assignment | |
| public static func /= (left: inout CGVector, right: CGFloat) -> CGVector { | |
| guard right != 0 else { fatalError("Division by zero") } | |
| return CGVector(dx: left.dx / right, dy: left.dy / right) | |
| } | |
| // Scalar-vector multiplication assignment | |
| public static func *= (left: inout CGVector, right: CGFloat) { | |
| left = left * right | |
| } | |
| } | |
| extension CGVector { | |
| // Vector magnitude (length) | |
| public var magnitude: CGFloat { | |
| return sqrt(dx*dx + dy*dy) | |
| } | |
| // Distance between two vectors | |
| public func distance(to vector: CGVector) -> CGFloat { | |
| return (self - vector).magnitude | |
| } | |
| // Vector normalization | |
| public var normalized: CGVector { | |
| return CGVector(dx: dx / magnitude, dy: dy / magnitude) | |
| } | |
| // Dot product of two vectors | |
| public static func • (left: CGVector, right: CGVector) -> CGFloat { | |
| return left.dx * right.dx + left.dy * right.dy | |
| } | |
| // Angle between two vectors | |
| // θ = acos(AB) | |
| public func angle(to vector: CGVector) -> CGFloat { | |
| return acos(self.normalized • vector.normalized) | |
| } | |
| } |
Alt + 8 in US layout. You can also replace the operator with anything you want.
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… On 10. Mar 2020, at 13:38, Phung Tien Minh ***@***.***> wrote:
How can I type this symbol • ? I can't find any keys containing it on my Mac keyboard.
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How can I type this symbol • ? I can't find any keys containing it on my Mac keyboard.