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

GilWright
Working through the steps (checking that the Info,plist matches exactly), run the demo game and what appears is grey but does not fill th...
New
yulkin
your book suggests to use Image.toByteData() to convert image to bytes, however I get the following error: "the getter ‘toByteData’ isn’t...
New
jamis
The following is cross-posted from the original Ray Tracer Challenge forum, from a post by garfieldnate. I’m cross-posting it so that the...
New
lirux
Hi Jamis, I think there’s an issue with a test on chapter 6. I own the ebook, version P1.0 Feb. 2019. This test doesn’t pass for me: ...
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
New
rainforest
Hi, I’ve got a question about the implementation of PubSub when using a Phoenix.Socket.Transport behaviour rather than channels. Before ...
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
gorkaio
root_layout: {PentoWeb.LayoutView, :root}, This results in the following following error: no “root” html template defined for PentoWeb...
New
dachristenson
I just bought this book to learn about Android development, and I’m already running into a major issue in Ch. 1, p. 20: “Update activity...
New

Other popular topics Top

New
PragmaticBookshelf
Learn from the award-winning programming series that inspired the Elixir language, and go on a step-by-step journey through the most impo...
New
AstonJ
Curious to know which languages and frameworks you’re all thinking about learning next :upside_down_face: Perhaps if there’s enough peop...
New
New
mafinar
This is going to be a long an frequently posted thread. While talking to a friend of mine who has taken data structure and algorithm cou...
New
New
PragmaticBookshelf
Author Spotlight Jamis Buck @jamis This month, we have the pleasure of spotlighting author Jamis Buck, who has written Mazes for Prog...
New
hilfordjames
There appears to have been an update that has changed the terminology for what has previously been known as the Taskbar Overflow - this h...
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
PragmaticBookshelf
A concise guide to MySQL 9 database administration, covering fundamental concepts, techniques, and best practices. Neil Smyth MySQL...
New

Sub Categories: