map_camera2D.gd

extends Camera2D
## Source: https://gitlab.com/realrobots/rimworldripoff/-/blob/1ee8ef79c7ac03e56628dbece33f855c2e090523/CameraController.gd

@export var zoomSpeed : float = 10;

var zoomTarget :Vector2

var dragStartMousePos = Vector2.ZERO
var dragStartCameraPos = Vector2.ZERO
var isDragging : bool = false

# Called when the node enters the scene tree for the first time.
func _ready():
	zoomTarget = zoom
	#The camera's position is fixed at the top-left corner (0,0), but the map
	# image is displayed relative to that position, so the image ends up with
	# its corner starting in the middle of the screen. Set the cameras# position
	# so it is in the center of screen so the map image origin is in the 
	# tje upper left corner
	
	# Get the screen size
	var screen_size = get_viewport().size
	# Calculate the center position
	var center_position = Vector2(screen_size.x / 2, screen_size.y / 2)
	# Set the camera's position to the center
	set_position(center_position)
	

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	Zoom(delta)
	SimplePan(delta)
	ClickAndDrag()
	
func Zoom(delta):
	if Input.is_action_just_pressed("camera_zoom_in"):
		zoomTarget *= 1.1
		
	if Input.is_action_just_pressed("camera_zoom_out"):
		zoomTarget *= 0.9
		
	zoom = zoom.slerp(zoomTarget, zoomSpeed * delta)
	
	
func SimplePan(delta):
	var moveAmount = Vector2.ZERO
	if Input.is_action_pressed("camera_move_right"):
		moveAmount.x += 1
		
	if Input.is_action_pressed("camera_move_left"):
		moveAmount.x -= 1
		
	if Input.is_action_pressed("camera_move_up"):
		moveAmount.y -= 1
		
	if Input.is_action_pressed("camera_move_down"):
		moveAmount.y += 1
		
	moveAmount = moveAmount.normalized()
	position += moveAmount * delta * 1000 * (1/zoom.x)
	
func ClickAndDrag():
	if !isDragging and Input.is_action_just_pressed("camera_pan"):
		dragStartMousePos = get_viewport().get_mouse_position()
		dragStartCameraPos = position
		isDragging = true
		
	if isDragging and Input.is_action_just_released("camera_pan"):
		isDragging = false
		
	if isDragging:
		var moveVector = get_viewport().get_mouse_position() - dragStartMousePos
		position = dragStartCameraPos - moveVector * 1/zoom.x