For a prototype I wanted to implement mobile swipe controls to move my player on the horizontal axis.

The first thing to make sure is to check the setting under “Project Settings -> General -> Input Devices -> Pointing”. The settings “Emulate Mouse From Touch” needs to be active.

In your node which shall be controlled by the swipe control you need the following code:

extends CharacterBody2D

var swipe_start : Vector2
var processing_swipe : bool = false

func _unhandled_input(event: InputEvent) -> void:
    if event is InputEventScreenTouch:
        if event.is_pressed():
            if not processing_swipe:
                processing_swipe = true
                swipe_start = event.position
        else:
            processing_swipe = false
    elif event is InputEventScreenDrag:
        calculate_swipe(event.position)

func calculate_swipe(position_now : Vector2) -> void:
    var diff = swipe_start - position_now
    global_position.x -= diff.x
    swipe_start = position_now

I created this code with Godot 4.6.