How to make enemy follow path without entering solid objects?

[ArchAngel]

How to make enemy follow path without entering solid objects?

Im new to Gamemaker.
And im trying to make a little pacman game.

I want my ghost(enemy) to follow a certain path and that it dont overlap/enter solid blocks.

I googled and didnt find an answer, would someone, please, clarify?


I made a video showing the problem and how i set up the script. It's just 30 seconds long, full HD.

Any tip/help is appreciated.

~~
I know i can add an event to when the ghost collides with a wall, but what am i supposed to do? How can i tell it to avoid the wall? Or how can i make the path perfectly ?
I believe the event should be :

If Hit wall { reverse }

But follow path.
And the path waypoints should be perfect and not cause this.

What am i doing wrong?

~~
I tried decreasing snap to 16 but it didnt help.
Does the sprite follow the path but on origin (0,0) of the sprite?

 

[Genetix]

You might want to read up on mp_path finding - should be exactly what you need. I'll share some code later when I'm home if it helps.