From GdScript to C#

vowowo8

Hello! I am reading a book called godot-game-engine-projects, and i am trying to write the code in c# instead of gdscript. In code fragment github
there is a code
func _on_Player_area_entered( area ):
if area.is_in_group("coins"):
area.pickup()
emit_signal("pickup", "coin")

So the question is, what is the area, is it Area2d type for c#? and what is area.pickup()? I know pickup method should be in coin file, but if area is area2d how can i get the pickup method from there? Or maybe area is just object type, and it could be coin type, when player collide with it?

TwistedTwigleg

vowowo8 func _on_Player_area_entered( area ):
if area.is_in_group("coins"):
area.pickup()
emit_signal("pickup", "coin")

So the question is, what is the area, is it Area2d type for c#? and what is area.pickup()? I know pickup method should be in coin file, but if area is area2d how can i get the pickup method from there?

My guess is that the ‘area’ argument is the coin node.

If this is attached to an area node’s area_entered function, then Godot will call it automatically when an area overlaps the area. In GDScript, this argument (area) will be the node object you overlapped with. Because GDScript is a dynamic language, you can just call methods/functions without needing to define its type.

For C# though, it is different because it is a typed language. I’m not sure which type Godot passes to the area_entered function in C#, but what you will need to do is take this type Godot passes, cast it to the coin type (check for null, if the cast is null it is not a coin), and then call the pickup function if it casts successfully.

I think the Godot documentation for C# shows how to cast and check, and it probably also shows what type is passed to the area_entered function. 🙂

cybereality

So the documentation for C# is kind of lacking. It's not difficult, but it is not as robust as for GDScript. In general, the API is exactly the same, it is just that C# uses PascalCase and GDScript uses snake_case. So all the API functions are identical and you just have to change the capitalization and remove the underscore. There are are some differences in the language and syntax (like how you create new variables) but this is not unique to Godot, and should be familiar if you've done any C# coding before.

In terms of your question, I don't use C# much, but it may look like this:

func _on_Player_area_entered( Area2D area ):
	if area.IsInGroup("coins"):
		area.pickup()
		EmitSignal("pickup", "coin")