Mouse Scrolling

gary-shaw

I'm collaborating with my nephew on an isometric RTS style game using Godot and GdScript and we're stuck on making the screen scroll as we want. He's got keyboard scrolling working fine, and i've used this so far to make it scroll with the mouse moving, but it's far from as we would like it to be.

func _process(_delta):
	if(get_viewport().get_mouse_position()):
			self.position = get_viewport().get_mouse_position()

What i'm after is that when the mouse moves to the edge of the screen, whether it be up / down / left or right, the screen scrolls in that direction, until the mouse is no longer going that way. I did get it scrolling while holding either the left or right mosue buttons down but they will be needed for building / sprite selection and placement so can't use that for the actual game.

Any ideas on how to implement the above ?

Thanks in anticipation :)

TwistedTwigleg

Welcome to the forums @"Gary Shaw"!

I got this working at some point for some project, so I know it’s totally doable, but I don’t think I have the project anymore. However, I think the code for it looked something like this:

# the size of the screen, in pixels, around all edges that
# will move the screen
const MOVEMENT_BORDER_SIZE = 48

func _process(delta):
	var mouse_position = get_viewport().get_mouse_position()
	var screen_size = get_viewport().size
	
	# horizontal movement
	if (mouse_position.x <= MOVEMENT_BORDER_SIZE):
		# move the screen left! For example:
		self.position.x -= 200 * delta
	elif (mouse_position.x >= screen_size.x - MOVEMENT_BORDER_SIZE):
		# move the screen right! For example:
		self.position.x += 200 * delta
	
	# vertical movement
	if (mouse_position.y <= MOVEMENT_BORDER_SIZE):
		# move the screen up! For example:
		self.position.y -= 200 * delta
	elif (mouse_position.y >= screen_size.y - MOVEMENT_BORDER_SIZE):
		# move the screen down! For example:
		self.position.y += 200 * delta

I’m not totally sure the script would work, but hopefully it kinda helps show it to detect if the mouse is at the edges of the screen. :smile:

gary-shaw

Thank you for the swift response and the welcome.

That works perfectly, exactly what was needed.

Cheers