Deselecting units in RTS prototype

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AndriySu

Hi all! A question from newbe - I make a simplistic RTS prototype to plays with various game mechanics and learn Godot.
Currently my sandbox looks as follows:
Locations - spawn units
Units - move betwen locations
Both Locations and Units are Area2D, can be selected on a mouse click, all attached to a root Node2d.

Question I have - what will be the best way to deselect other units on click?
I currently look into the following:
1) make a 'cursor' object that once select a new Location or Unit - will emit signal to others to get deselected
2) selected Location/Unit sends a signal to Root node and the latter looks into all its Location and Unit children and makes them deselected. Appreciate your recommendation on what will be the best way to iterate thru the children nodes.

Can you please suggest what will be the best approach, what I can be missing here. What patterns are commonly used in games without map grid?

MagickPanda

imho you are making simple logic complicated, to deselect unit, you just need to deselect all upon zero/no result from camera space raycast test.

AndriySu

MagickPanda
May I ask you for more details? Or at least keywords to Google "camera space raycast". What I'm finding now doesn't look relevant.

MagickPanda

AndriySu https://github.com/Miziziziz/GodotRTS2

Take a look at cambase.gd, my game is using a script basef on this one to handle object selection.

AndriySu

thanks will try. After additional research I finally figured out that raycast from the camera is one of the ways described in Godot official docs. Need to come back and learn the basics.

Lethn

I know code has already been posted up but been working on this myself, also signals are your friend for doing lots of code without it executing every frame.


extends Spatial

onready var playerCameraGroup = get_tree().get_nodes_in_group("PlayerCamera")
onready var playerCamera = playerCameraGroup[0]

var buildingSlots

var mouseInteractionEnabled = true

var rayOrigin = Vector3()
var rayEnd = Vector3()

var previousSelection
var currentSelection

var currentPlayerArmyPosition = Vector3()
var clickPosition = Vector3()

func _physics_process(_delta):
	
	var spaceState = get_world().direct_space_state
	var mousePosition = get_viewport().get_mouse_position()
	
	rayOrigin = playerCamera.project_ray_origin(mousePosition)
	rayEnd = rayOrigin + playerCamera.project_ray_normal(mousePosition) * 10000
	var intersection = spaceState.intersect_ray(rayOrigin, rayEnd)
	
	if Input.is_action_just_pressed("RightClick"):
		if intersection.collider.is_in_group("Floor"):
			clickPosition = intersection.position
		
	if Input.is_action_just_pressed("LeftClick") and mouseInteractionEnabled == true:
		if not previousSelection == null:
			previousSelection.visible = false
		if intersection.collider.is_in_group("PlayerArmy"):
			currentSelection = intersection.collider.get_child(0)
			currentSelection.visible = true
			previousSelection = currentSelection
			print ("Player Army Selected")
			
			if not buildingSlots == null:
				buildingSlots.visible = false
			
		if intersection.collider.is_in_group("PlayerTown"):
			currentSelection = intersection.collider.get_child(0)
			currentSelection.visible = true
			previousSelection = currentSelection
			
			buildingSlots = intersection.collider.get_child(1)
			buildingSlots.visible = true
			
			print ("Player Town Selected")
		if intersection.collider.is_in_group("NeutralTown"):
			currentSelection = intersection.collider.get_child(0)
			previousSelection = currentSelection
			print ("Neutral Town Selected")
			
			if not buildingSlots == null:
				buildingSlots.visible = false
			
		if intersection.collider.is_in_group("EnemyTown"):
			currentSelection = intersection.collider.get_child(0)
			currentSelection.visible = true
			previousSelection = currentSelection
			print ("Enemy Town Selected")
			
			if not buildingSlots == null:
				buildingSlots.visible = false
			
		if intersection.collider.is_in_group("Floor"):
			if not previousSelection == null:
				previousSelection.visible = false
			if not currentSelection == null:
				currentSelection.visible = false
				print ("Floor Selected")
			if not buildingSlots == null:
				buildingSlots.visible = false
			
		if intersection.collider.is_in_group("OutOfBounds"):
			if not previousSelection == null:
				previousSelection.visible = false
			if not currentSelection == null:
				currentSelection.visible = false
			if not buildingSlots == null:
				buildingSlots.visible = false


func _on_Button_mouse_entered():
	mouseInteractionEnabled = false

func _on_Button_mouse_exited():
	mouseInteractionEnabled = true

func _on_EndTurnButton_mouse_entered():
	mouseInteractionEnabled = false

func _on_EndTurnButton_mouse_exited():

	mouseInteractionEnabled = true

Worth pointing out that this is only for clicking on single units and stuff on the map, I haven't messed about with box selection as of yet.