Hacker News: lylejantzi3rd

New comment by lylejantzi3rd in "Ask HN: What are you working on? (June 2026)"

lylejantzi3rd — Sun, 14 Jun 2026 17:33:04 +0000

I'm working on GPS tools to help support my current contract. I've found there are no good tools for tracing a route on a map and having a mobile device think it's traveling that route. I'm not just talking GPS coordinates, but speed, direction, motion detection, precise timing between waypoints, being able to play these trips forward and backward, step by step, etc. I'm talking time-travel debugging for GPS applications.

It's still early days, but I have a demo running. Unfortunately, it requires using a drop-in replacement library for CoreLocation. That alone may make it infeasible.

New comment by lylejantzi3rd in "I automated the part of freelancing nobody talks about"

lylejantzi3rd — Sun, 14 Jun 2026 17:30:26 +0000

It looks nice. Maybe I'll give it a shot.

New comment by lylejantzi3rd in "Ask HN: What Are You Working On?"

lylejantzi3rd — Sat, 13 Jun 2026 09:34:56 +0000

A system for instrumenting GPS routes.

A user reports a location bug on their morning commute. You're 2,000 miles away. Instead of flying out to reproduce it, you replay their exact GPS trip on your simulator. Same route. Same speed. Same timing.

Record & replay real GPS routes for iOS.

Video here: https://x.com/LyleMakes/status/2064438713124270233

New comment by lylejantzi3rd in "Ask HN: What are tools you have made for yourself since the advent of AI?"

lylejantzi3rd — Mon, 08 Jun 2026 23:30:00 +0000

A MacOS desktop app and a mobile app for instrumenting GPS routes.

Screenshot here: https://x.com/LyleMakes/status/2063784301594853657/photo/1

New comment by lylejantzi3rd in "How does anybody test phone applications that do location tracking?"

lylejantzi3rd — Mon, 08 Jun 2026 01:05:46 +0000

I ran into some interesting limitations when trying to test a friend's trip tracking application.

I can record a sequence of events that includes just about anything the phone can do: lat/long changes, speed, orientation, changes in motion state (idle, walking, driving, etc), geofencing, bluetooth state changes, wifi state changes, etc. Everything timestamped.

But, how do you play this sequence back in a way that makes the app think you're taking the same trip again? I was hoping the OS (iOS and/or Android) would provide a mechanism for this. And it does, but only lat/long. Nothing else.

The missing information is very important when trying to debug what's going on in my application on any particular trip. Now, I know I can create my own version of CLLocation that will generate these events whenever I want them, but I was hoping to find a solution that didn't require changing application code to support. I would like to take my findings and create a product that can help people do this sort of testing and requiring them to switch out CLLocation everywhere it's used in their application is a difficult sell.

How does anybody test phone applications that do location tracking?

lylejantzi3rd — Mon, 08 Jun 2026 01:05:46 +0000

Article URL: https://twitter.com/LyleMakes/status/2063784301594853657

Comments URL: https://news.ycombinator.com/item?id=48440281

Points: 3

# Comments: 2

New comment by lylejantzi3rd in "Ask HN: What are you working on? (May 2026)"

lylejantzi3rd — Sun, 10 May 2026 19:43:10 +0000

It's early days. I'm not even sure it's possible.

New comment by lylejantzi3rd in "Ask HN: What Are You Working On? (April 2026)"

lylejantzi3rd — Sun, 12 Apr 2026 19:45:00 +0000

An old school WYSIWYG RAD GUI builder for native applications. Because I don't accept that native app development needs to suck as much as it does.

New comment by lylejantzi3rd in "Epic Games to cut more than 1k jobs as Fortnite usage falls"

lylejantzi3rd — Tue, 24 Mar 2026 22:18:04 +0000

Just because it's popular, doesn't mean it's financially successful. Take a look at YouTube. They lost money hand over fist for decades.

New comment by lylejantzi3rd in "Epic Games to cut more than 1k jobs as Fortnite usage falls"

lylejantzi3rd — Tue, 24 Mar 2026 22:15:21 +0000

> I don’t think this is necessarily what is happening.

This is exactly what happened with my niece, my nephew, and all of their friends.

Which isn't to say they've outgrown all of the games they played when they were younger. They still play minecraft, stardew valley, kirby, mario, etc. I don't know why, but they all bounced off of Fortnite after they hit a certain age. I wonder why.

New comment by lylejantzi3rd in "Windows native app development is a mess"

lylejantzi3rd — Sun, 22 Mar 2026 14:36:01 +0000

But, why? It's been 30 years. You'd think somebody would have figured out how to make a decent GUI toolkit or framework.

New comment by lylejantzi3rd in "Standardizing source maps"

lylejantzi3rd — Wed, 11 Mar 2026 11:12:00 +0000

Probably. The RADDBG folks recently created their own debug format (RDI) to replace PDB and DWARF. Could be worth a gander.

https://github.com/EpicGamesExt/raddebugger?tab=readme-ov-fi...

New comment by lylejantzi3rd in "Show HN: I spent 4 years building a UI design tool with only the features I use"

lylejantzi3rd — Tue, 10 Feb 2026 21:51:24 +0000

Wouldn't that be more of a RAD tool, like Lazarus[0]? Or are you suggesting you could do both in the same tool? I'm not doubting it's possible, but those are two very different (and large!) products from a functional standpoint. Combining them is going to be quite the undertaking.

[0]: https://www.lazarus-ide.org/

New comment by lylejantzi3rd in "I write games in C (yes, C) (2016)"

lylejantzi3rd — Sun, 08 Feb 2026 13:46:36 +0000

We'll have to agree to disagree on this one.

New comment by lylejantzi3rd in "I write games in C (yes, C) (2016)"

lylejantzi3rd — Sat, 07 Feb 2026 22:51:49 +0000

If you have patience, the first 30 or so episodes of Handmade Hero are pretty good.

https://guide.handmadehero.org/code/

New comment by lylejantzi3rd in "I write games in C (yes, C) (2016)"

lylejantzi3rd — Sat, 07 Feb 2026 22:42:51 +0000

Are you working on the original codebase or the OpenJK fork?

New comment by lylejantzi3rd in "Evolution of car door handles over the decades"

lylejantzi3rd — Fri, 06 Feb 2026 17:42:38 +0000

This is a great video by SuperfastMatt on the engineering behind and evolution of the Tesla door handle.

https://www.youtube.com/watch?v=Bea4FS-zDzc

New comment by lylejantzi3rd in "I turned my Anki side project into $15K raised on Kickstarter"

lylejantzi3rd — Thu, 05 Feb 2026 12:46:15 +0000

You can do the spaced repetition logic yourself with a leitner box. Details here: https://ncase.me/remember/

New comment by lylejantzi3rd in "Lessons learned shipping 500 units of my first hardware product"

lylejantzi3rd — Wed, 04 Feb 2026 10:20:05 +0000

The product in question has a cast part. How do you do that in low quantity by yourself? Sand casting?

New comment by lylejantzi3rd in "You need a kitchen slide rule"

lylejantzi3rd — Fri, 16 Jan 2026 12:11:11 +0000

> Even with messy hands

Why would you do this while you're cooking? I do all of my calculations before I start, usually in front of a computer.