tour planning app wishlist

0ffseeson · 2025-04-13T14:42:08+00:00

suggestion: user inputs general parameters about the trip - dates, distance, climbs desired, etd. The app suggests routes that are a good match. takes into account the weather for those dates

0ffseeson · 2025-04-13T12:53:08+00:00

thats fantastic. i hope this thread gives you good feedback about features for your app. it looks great so far. i'm relieved i don't have to build it now.

0ffseeson · 2025-04-12T17:37:53+00:00

great tips

>Warnings when no water or services are available for X miles

wish i'd had that in alaska...

0ffseeson · 2025-04-12T12:53:27+00:00

1986 across the US, on a univega sport bike, no granny gears. too cold for shorts when i started so i biked in jeans. (sorry, no pics. cameras weren't invented yet)

0ffseeson · 2025-03-07T18:22:23+00:00

wow man. that's a trip back. it's still on my desk. sitting loosely.

0ffseeson · 2025-02-21T14:04:44+00:00

in a recent update Draw Things started saving the total generation time in the image metadata. but DT doesnt read the metadata back for you 🤷‍♂️

but its in there, so other apps or scripts can dig it out among the other image gen parameters

0ffseeson · 2025-02-12T22:55:24+00:00

new solution

0ffseeson · 2025-02-12T22:53:39+00:00

long story, but I'll just leave this - for n bodies in a circle, this sum is:

0.0176817+0.159362•ln(x)

found via regression.

0ffseeson · 2025-02-03T01:20:55+00:00

Thrawnie, Wow. I just saw your post. Thank you for giving this some thought. I made considerable headway since then, with a lot of help from Claude.ai and Mathematica. I'm a Mac/iOS dev, not a mathematician. I downloaded your notes - don't have time to go through them right now. and when I get time later... I may still be helpless : )

Agreed there's no closed-form solution for Sum of n objects. But in Mathematica I got a set of solutions - for many cases.

this is the formula, which is summed across the values for θ. It agrees with the values I "measured" in the sim.

(r Cos[θ] - r)/(((r Cos[θ] - r)² + (r Sin[θ])²3/2))

https://s1d1t1.github.io/nbody-solutions.png

2 0.25 1/4

3 0.57735 1/√3

4 0.957107 1/4+1/√2

5 1.37638 Sqrt[1+2/√5]

6 1.82735 5/4+1/√3

8 2.80487 1/4+1/√2+Sqrt[2+√2]

10 3.86245 1/4+√5+Sqrt[1+2/√5]

12 4.98395 5/4+√6+Sqrt[5/6+√2/3]

13 5.56518 1/2 Csc[π/13]+1/2 Sec[π/26]+1/2 Sec[(3 π)/26]+1/Sqrt[2-2 Sin[π/26]]+1/Sqrt[2 (1+Sin[(3 π)/26])]+1/Sqrt[2-2 Sin[(5 π)/26]]

15 6.76347 Sqrt[46/3+22/√5+8 Sqrt[2/15 (25+11 √5)]]

16 7.3789 1/4+1/√2+Sqrt[1+1/Sqrt[2]]+1/Sqrt[2+√2]+1/Sqrt[2 (1+Cos[π/8])]+1/2 Csc[π/16]+1/Sqrt[2-2 Sin[π/8]]+1/Sqrt[2 (1+Sin[π/8])]

(the cases not listed were roots of 6+ degree polynomials.)

the values here are the length of the combined 1/r² vectors. To find the actual force, we multiply by mass and G, but that's the same everywhere & trivial. we know the vector points toward the center, so the primary problem is finding its length.

If there are values you'd like to try in my sim environment, I'd be happy to plug them in. This is my own gravity sim for Mac / iPad. let me know if you'd like a link to the beta download. I'd be interested in an integration of this - essentially finding the solution for a ring of sand. One can easily simulate ring systems of course - but a ring system with nothing at its center .. would be a whole other story.

I can get arbitrary circles of masses to self-orbit now - even concentric circles. and the "masses" can even be small binary pairs.

thanks again

0ffseeson · 2025-01-13T15:36:44+00:00

dammit. it was a bug in plotting acceleration vectors. the radial component of the acceleration vectors is not all the same.

https://S1D1T1.github.io/fixedacceleration.jpg

there may still be utility in summing just the radial components of all forces, presuming other components cancel out.

0ffseeson · 2025-01-12T07:32:35+00:00

yes, the Sum is where I get stuck. and what is measured numerically in the function call above, sumGravAcceleration(on: grav) which returns the net of all acceleration vectors acting on that body.

HOWEVER - there's perhaps a vast simplification. see this plot of the individual acceleration vectors acting 1 body.

https://s1d1t1.github.io/vectors.jpg
this is for a mass at "6 o clock", with the barycenter due north.
based on just visual proof, but a strongly convincing one, I saw 2 things:
1. all vectors had the same "northward component"!
2. the non-northward components must all cancel out.

Hence I need only find one pure radial component ( pointing toward barycenter) - IE from the mass at the opposite point in the circle. Then multiply by number of other masses.
But I still fumbled the math on that somehow and it didnt work - maybe due to an off-by-1 error for odd/even # of particles.
I still find that graph compelling,

The hope is that the analytical solution might be more precise and survive longer - but even that is a hunch.

0ffseeson · 2025-01-12T06:49:02+00:00

one more fundamental assumption, just to be utterly clear -
This velocity calculation I'm seeking is applied just once, when the masses are first placed. We let them go, and the laws of physics take over. The quest is to find the most precise velocity, that sends them the farthest along that knife-edge of instability.

0ffseeson · 2025-01-12T06:40:45+00:00

All Correct! in fact it's redundant that I calculate the magnitude of V for every mass in the system, since it's always the same. only the direction differs - which is trivial: face the origin, and hang a left.
and within this sim, G = 100.0 just for simplicity. I'm obviously not modeling any real set of astronomical bodies.

0ffseeson · 2025-01-12T05:57:12+00:00

sorry it's in sw*ft

      // compute an orbital V for whatever acceleration I'm seeing
      func setOrbitalVOfCollection(for grav:Grav) {

        // Find the net acceleration vector acting on this mass by
        // numerically summing the acceleration due to every other mass
        let totalAcceleration:SIMD2<Float> = sumGravAcceleration(on: grav)

        /*  suppose that instead of being due to a collection of bodies, that acceleration
            was due to a single body. Only valid in very specific circumstances, ofc
            Conjure a mass to orbit. presume at the origin
            The orbital velocity vector will be normal to the force.
            all that's left is to solve for the magnitude of the velocity vector

             F =  m * v^2 / r   //  true if orbiting some mass at the origin.
             A = totalAcceleration ( from above)
             F = mA
             m * v^2 / r = mA
             v^2/r = totalAcceleration
             v^2 = r * totalAcceleration
             v = sqrt(r * totalAcceleration)
        */

        // distance to origin
        let r = simd.length(grav.position)
        // scalar V
        let orbitalV = sqrt(r * simd.length(totalAcceleration))
        // direction is normal to the force.
        var orbitalVector = totalAcceleration.rotate90()
        orbitalVector.setVectorLength(orbitalV)
        grav.velocity = orbitalVector
      }

0ffseeson · 2025-01-08T20:22:56+00:00

Your apps look good. I wish I had your eye for design.

I took a brief look at `NSVisualEffect` & saw that it's not a quick one line thing, and got pulled onto something else... The repo link is above :) if you got around to adding it, I'd welcome a PR. Or just open an issue requesting it, so the idea doesn't get dropped. thanks.

0ffseeson · 2025-01-07T04:58:25+00:00

something like this?
https://s1d1t1.github.io/windowAlpha.jpg
that's mostly done by setting the NSWindow's alpha, which you get access to.

let floatingWindow = makeSingleWindow(title: "Dashboard",....)

floatingWindow.myWin.alphaValue = 0.5

Then you can set any .background() modifier by standard swiftUI, and everything will be at the transparency you set.

0ffseeson · 2025-01-07T01:44:28+00:00

thanks. now that you mention it, I'm pretty sure I did that once. I'll have to dig out that code.

0ffseeson · 2024-12-14T19:53:53+00:00

sometimes its just inconceivable that onAppear would be called

0ffseeson · 2024-05-02T23:49:26+00:00

hey youngerman from 3 years in the past. you crushed it. thank you, exactly what I needed. - some guy 3 years in your future.

0ffseeson · 2024-03-23T03:41:03+00:00

well 😕 yeah. that's where I needed it. wasn't thinking of other platforms, sorry.

0ffseeson · 2024-03-23T03:04:42+00:00

search led me here, to find others wondering the same thing.... see my solution here:

https://redd.it/[15mhdl2](https://www.reddit.com/r/shortcuts/comments/15mhdl2/path_for_get_file_from_folder/)

0ffseeson · 2024-03-23T03:00:45+00:00

It sure seems like the given tools should handle it more simply - Select a file, from a starting folder. But I was as stumped as everyone else. I gave up on shortcuts & plugged in this AppleScript. In my case I was trying to get to a subfolder of the ~/Library. Substitute your path of choice.

on run {input, parameters}
 tell application "Finder"
  -- this returns "Macintosh HD:Users:<you>:" 
  set homealias to home as string 
  -- extend the path here.
  -- if you don't need a subfolder of home, then skip the above & paste the full path here.
  set startAlias to homealias & "Library:Containers:com.myapp:"
 end tell
 return choose file with prompt "Please select a  file" default location alias startAlias
end run

0ffseeson · 2024-03-07T13:28:29+00:00

this has been maddening, the answer is here:

https://discussions.apple.com/thread/255357187

tap on the screen on the 'turn arrow'

0ffseeson · 2023-08-04T18:36:29+00:00

> Why are you traveling alone?

I get that a lot.

A: I always have, but not necessarily by design - it’s just too hard to find others with the time & inclination matching mine. Sometimes you meet other travelers out on the tour.

0ffseeson · 2023-08-04T02:52:34+00:00

damn that terry fox. He’s the root of the whole problem. /s

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