Topic was automatically imported from the old Question2Answer platform.
Asked By
CraftyManiac
Old Version
Published before Godot 3 was released.
Hey there. I’m super new to Godot and game dev in general. I am trying to find a way to rotate a a sprite when I click and drag in a circular motion and add a value to a var whenever it’s moved a little bit, like you would with a valve handle or a crank. Any help would be appreciated thanks!
Do you want the user having to drag by doing an arc or a straight line?
Zylann | 2016-12-09 18:14
user dragging in an arc/ circle to turn the valve/crank
I fiddled a little in the editor and this is what I came up with:
Use an Area2D with a CollisionShape2D that has the shape you want for dragging (be it a circle or a handle), make sure it is set as pickable=true, Then use a script that listens to the Area2D input_event signal so you’ll know when the mouse clicks on it:
Sprite (crank.gd)
ClickArea (Area2D)
CollisionShape2D
After that you need further input processing and a bit of math:
crank.gd
extends Sprite
var dragging = false
func _ready():
# Connect to the Area2D input signal so we know when the user clicks on it
get_node("ClickArea").connect("input_event", self, "_on_area_input_event")
set_process_input(true)
func _on_area_input_event(viewport, event, shape):
if event.type == InputEvent.MOUSE_BUTTON:
# Start dragging when the user presses the mouse button over the clickable area
dragging = event.pressed
func _input(event):
if dragging:
if event.type == InputEvent.MOUSE_MOTION:
var motion = event.relative_pos
var new_pos = get_global_mouse_pos()
var prev_pos = new_pos - motion
var center = get_global_pos()
# Calculate the angular motion of the crank based on the arc made with the mouse
var angle = (prev_pos - center).angle_to(new_pos - center)
rotate(angle)
elif event.type == InputEvent.MOUSE_BUTTON and event.pressed == false:
# Stop dragging when the user releases the mouse button
dragging = false
