pudgyturtle

pudgyturtle

Hands-on Rust dungeon crawler bug I can't figure out (Amulet of Yala)

@herbert

Hoping someone can point me in the right direction here: I’m working through the book Hands-On Rust and have just written the code required to spawn the Amulet of Yala in the map at the most accessibly distant tile from where the player spawns. It’s supposed to be added in the corner of some random faraway room, like this:

That image is from the book on pg 180. My code, however, has the amulet spawning not in a room but in one of the four corners of the entire map screen. i.e. completely unreachable:

I combed through every line of code and compared it to what’s in the author’s official repo (HandsOnRust/WinningAndLosing/winning at main · thebracket/HandsOnRust · GitHub) but can’t see what my mistake is. I finally just copied the code from all the files I touched for this Amulet of Yala task to ensure it’s identical, but the amulet is still spawning in a screen corner out of reach. The only files I edited for this are winning/src/components.rs winning/src/spawner.rs winning/src/map_builder.rs winning/src/main.rs winning/src/turn_state.rs and 'winning/src/end_turn.rs. I’m pretty sure the error involves map_builder.rs because it’s the Dijkstra map code that is determining the distance/placement of the amulet in relation to the player:

Anyway, I created a Github repository of all my code in case someone is willing, able, and kind enough to have a look. GitHub - pudgyturtle/dungeoncrawl I’m reluctant to suggest it’s a bug or error with the book because so far every error I’ve had has been my own typo or oversight, but this one has me super stumped. I’d appreciate any suggestions or help!

First Post!

malachid

malachid

@herbert

I’ll start by saying that I compared your code to my older commit and I didn’t see anything wrong with your code. I verified that mine was working and yours wasn’t. I did some debugging and found that yours is always positioned in one of the 4 corners. Specifically in:
idx [ dist ] point
0 [62]: Point { x: 0, y: 0 }
79 [97]: Point { x: 79, y: 0 }
3920 [31]: Point { x: 0, y: 49 }
3999 [66]: Point { x: 79, y: 49 }

I also verified that all 4 corners are always walls, as they should be since all four edges are walls.

As a test, I added this to the mb.amulet_start function:

                .filter(|(idx, dist)| {
                    match mb.map.tiles[*idx] {
                        TileType::Floor => {
                            true
                        },
                        TileType::Wall => {
                            false
                        },
                    }
                })

This resulted in the amulet being reachable.

That being said, I don’t have that code snippet in mine - but maybe that will help you track it down.

Where Next?

Popular Pragmatic Bookshelf topics Top

edruder
I thought that there might be interest in using the book with Rails 6.1 and Ruby 2.7.2. I’ll note what I needed to do differently here. ...
New
herminiotorres
Hi! I know not the intentions behind this narrative when called, on page XI: mount() |> handle_event() |> render() but the correc...
New
New
patoncrispy
I’m new to Rust and am using this book to learn more as well as to feed my interest in game dev. I’ve just finished the flappy dragon exa...
New
adamwoolhether
I’m not quite sure what’s going on here, but I’m unable to have to containers successfully complete the Readiness/Liveness checks. I’m im...
New
taguniversalmachine
It seems the second code snippet is missing the code to set the current_user: current_user: Accounts.get_user_by_session_token(session["...
New
s2k
Hi all, currently I wonder how the Tailwind colours work (or don’t work). For example, in app/views/layouts/application.html.erb I have...
New
tkhobbes
After some hassle, I was able to finally run bin/setup, now I have started the rails server but I get this error message right when I vis...
New
a.zampa
@mfazio23 I’m following the indications of the book and arriver ad chapter 10, but the app cannot be compiled due to an error in the Bas...
New
roadbike
From page 13: On Python 3.7, you can install the libraries with pip by running these commands inside a Python venv using Visual Studio ...
New

Other popular topics Top

PragmaticBookshelf
Andy and Dave wrote this influential, classic book to help their clients create better software and rediscover the joy of coding. Almost ...
New
PragmaticBookshelf
Write Elixir tests that you can be proud of. Dive into Elixir’s test philosophy and gain mastery over the terminology and concepts that u...
New
PragmaticBookshelf
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
New
DevotionGeo
I know that -t flag is used along with -i flag for getting an interactive shell. But I cannot digest what the man page for docker run com...
New
foxtrottwist
A few weeks ago I started using Warp a terminal written in rust. Though in it’s current state of development there are a few caveats (tab...
New
AstonJ
Was just curious to see if any were around, found this one: I got 51/100: Not sure if it was meant to buy I am sure at times the b...
New
PragmaticBookshelf
Programming Ruby is the most complete book on Ruby, covering both the language itself and the standard library as well as commonly used t...
New
PragmaticBookshelf
Get the comprehensive, insider information you need for Rails 8 with the new edition of this award-winning classic. Sam Ruby @rubys ...
New
NewsBot
Node.js v22.14.0 has been released. Link: Release 2025-02-11, Version 22.14.0 'Jod' (LTS), @aduh95 · nodejs/node · GitHub
New
mindriot
Ok, well here are some thoughts and opinions on some of the ergonomic keyboards I have, I guess like mini review of each that I use enoug...
New

Sub Categories: