I'm developing a Pac-Man game and using tilemaps with SFML in C++, but I've encountered a collision issue. The collision detection only works for the first wall in my array, completely ignoring collisions for any subsequent walls. I'm curious about how helpful a debugger would be in diagnosing this issue, especially since I've never used one before. I can share my code if you're interested!
3 Answers
Debuggers are super helpful! You can step through your code to get a better sense of why the collision check isn't happening for the other walls. You can see exactly what's being processed at each step.
If the issue is reproducible, then yes, a debugger is great for tracking down such bugs. However, if it’s a timing issue, you might need to log events instead. Starting with a debugger is wise, but make sure your code is well-organized; AI tools can also review it but might struggle with concurrency issues.
I think I see what's happening. Your functions seem solid mathematically for checking collisions. The real problem arises from the position-state-machine race condition in your `PlayerCollision` function. When you loop through `map.walls.size()`, if a wall doesn’t collide, you update `player.pacman` with `player.newpos`. But if another wall does collide, it resets `player.pacman` to `player.pos`, undoing any previous movements. This results in only the first wall being processed correctly—once you hit a collision, it overwrites all previous ones.
To fix it, process all walls first to see if any collide, and only then decide how to adjust `player.pacman` accordingly! Introduce a flag to check collisions before making updates.
Thanks for breaking that down! It definitely cleared up why my code was only considering the first wall. I'm amazed how just resetting to `player.pos` can mess up collision detection. This really helps!
Good point! I've heard about conditional breakpoints too. I’m thinking of trying those if I get stuck. They should help track when my collision logic breaks!