florianreinhart/geodesy

Geodesy functions in Swift 🌎

Geodesy Functions for Swift

This is a port of the excellent JavaScript geodesy module by Chris Veness to Swift.

Implementation Status

All spherical functions are implemented and tested.

geodesy's Issues

Doesn't compile with destination Apple Vision Pro

The package doesn't compile with destination Apple Vision Pro
(Apple Vision Pro(Designed for iPad) is no problem.

Coordinate.swift:

#if os(OSX) || os(iOS)
    import Darwin
#elseif os(Linux)
    import Glibc
#endif

Maybe this is enough:

#if os(OSX) || os(iOS) || os(visionOS)
    import Darwin
#elseif os(Linux)
    import Glibc
#endif

Calculation of perpendicular point of a line (p1, p2) and a point (p3) near the line

Hey @florianreinhart!

First: Thank you very much for this great collection of useful geodesy functions!

This isn't a real issue but more a question. I'm currently struggling on calculating the perpendicular point of a line (p1, p2) and a point (p3) near the line.

Background: We are using MKPolyLine to draw lines on the map. The user should be able to tap (p3) on (or near to) a line segment (p1, p2). Now I need the closest point in the line (the perpendicular point) to the touch point, to show a popup with detailed informations at this line point. It should look like this:

Now I'm asking myself if this is possible with your functions? Maybe I'm missing something, unfortunately I don't find a solution...

Question: Is this calculation possible with your library or is an entire new function needed to get the result?

Thanks in advance!