Dijkstra on real map data with raylib(github.com)
github.com
Dijkstra on real map data with raylib
https://github.com/uysalibov/gezgin
10 comments
If you're interested in the A* algorithm to implement yourself, here is a solid base as reference [1]
[1] https://www.redblobgames.com/pathfinding/a-star/introduction...
[1] https://www.redblobgames.com/pathfinding/a-star/introduction...
Yeah, I saw that video too. But it's created with Python and Blender.
I'm curious what your results would be if you switched to A*. The heuristic could be as simple as geographic distance, which would still allow for optimal paths but might reduce the amount of searching you do in the opposite direction of your destination.
What heuristic distance function is being used? If it were using Euclidean distance, wouldn’t it be a lot more efficient and not pursue paths that are going in literally the opposite direction as the destination?
I use Squared Euclidean distance. Yes, dijkstra algorithm like that way. But if you want to pursue to destination i need to implement A* too.
Yeah, Dijkstra is more for graph search where maybe you have weights but not actual vectors. But this does give a nice visualisation of how far you can get from a single point in a given time.
At my university, one of the homework exercises was implementing A* on real map data. Really gave a perspective on the speed of computers, from what I remember, it was megabytes of map data of the UK, but calculating the best path from London to Edinburgh was within tens of milliseconds.
Very much cute :D
And I gotta agree, raylib is cute lil' library. And I love the fact that it has bindings to so many languages, and e.g makes making games in Common Lisp a joy. Or any language, that one would want to use.. well not all, but a lot.
And I gotta agree, raylib is cute lil' library. And I love the fact that it has bindings to so many languages, and e.g makes making games in Common Lisp a joy. Or any language, that one would want to use.. well not all, but a lot.
Raylib is amazing.
Thank you. I really like raylib. It's so powerfull.
This is very cool! I compiled it on m2 with no problems.
Istambul is an excellent choice. I enjoyed watching the algorithm take for ever to find a route from the most northern part of the river to the other side :)
Istambul is an excellent choice. I enjoyed watching the algorithm take for ever to find a route from the most northern part of the river to the other side :)
Raylib is the best visual library for C! You can do whatever you'd like, as long as you can program it, which is always the most interesting part of the day.
Great work but I cant relate to it because I am not from Istanbul?
How do I add it for other cities. Specifically, for San Francisco Bay area or for Hyderabad, India.
How do I add it for other cities. Specifically, for San Francisco Bay area or for Hyderabad, India.
What would be the best way to generate custom maps for use with an algorithm like Dijstra's or A*? I have seen some methods using various game level editors to output to a grid, but is there an easy way to draw custom maps, such as indoors locations, and create your node map with additional JSON data visually?
The files under Maps/*.json seem to be generated via https://wiki.openstreetmap.org/wiki/Overpass_API
You can generate your own and rebuild
You can generate your own and rebuild
Thx. Any instructions on how to "generate your own" would be appreciated.
You can try one of the Quickstart guides on that page. Just type in "San Francisco" in the search bar on the map on this page: https://overpass-turbo.eu/ and then run your search query (drinking fountains by default). The bounding box should be whatever is in view of the map on the right. Then you can click the Data tab to see exported XML.
Looks like the file loading for the map data is hard coded into the initialization.
Yes, I do like that. My istanbul data hard coded. But i want to add data import menu. It's on my todo list.
FYI the build steps should be simplified to
cmake -B build -S .
cmake --build build
Bravo! Thank you for sharing -- glad to learn about raylib and the overpass API.
Unfortunately I don't think the Redditor shared their code.