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Attention | Topic was automatically imported from the old Question2Answer platform. |
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Asked By | Visterface |
Hello,
I am new to the godot engine and new to game enginiering. I have done the your first game in the documentation . Based on that I wanted to program a “Flappy Bird” clone. I am now having problems connecting the signals. My scenes look like this:
This is the main-scene code:
onready var Wall = preload("res://Wall.tscn")
func _ready():
randomize()
get_tree().get_root().find_node("Wall", true, false).connect("lose_game", self , "_on_Wall_lose_game()")
func _on_Wall_lose_game():
get_tree().reload_current_scene()
func _on_WallSpawTimer_timeout():
$WallPath/WallSpawnLocation.offset = randi()
var wall = Wall.instance()
add_child(wall)
wall.position = $WallPath/WallSpawnLocation.position
As you can see, the timer spawns the wallparts every one second. This works fine.
This is the wall-scene code:
extends Node2D
var screen_size
var velocity = Vector2()
signal get_point
signal lose_game
# Called when the node enters the scene tree for the first time.
func _ready():
screen_size = get_viewport_rect().size
# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
velocity.x = -150
position += velocity*delta
if position.x < 0:
queue_free()
func _on_UpperWall_area_entered(area):
emit_signal("lose_game")
print("hit oben")
func _on_LowerWall_area_entered(area):
emit_signal("lose_game")
print("hit unten")
func _on_Score_area_exited(area):
emit_signal("get_point")
print("punkt")
The wall-scene should transmit two signals:
- “lose_game” when the upper-wall-collision or the lower-wall-collision gets triggerd. This should be connected with the main scene and restart the game.
- “get_point” when the score-collision is triggerd. This should be connected to the HUD-scene and update the label.
The print-methods works fine so I assume that the singals are sent.
At last, this is the HUD-scene code:
extends Node2D
# Declare member variables here. Examples:
var score = 0
# var b = "text"
# Called when the node enters the scene tree for the first time.
func _ready():
get_tree().get_root().find_node("Wall", true, false).connect("get_point",self, "handle_get_point")
func handle_get_point():
score += 1
$ScoreLabel.text = str(score)
print(score)
The documentation says to connect the nodes with the signals in the ready_function. I have already tested some variations (e.g. $Wall.connect(“get_point”,self, “handle_get_point”), get_Node(“Wall”).connect(…), get_tree().get_root().find_node(“Wall”, true, false).connect(…)) but nothing seems to connect the signals correctly.
When im using $Wall.connect("lose_game", self , "_on_Wall_lose_game()") this error appear:
E 0:00:00.610 get_node: (Node not found: "Wall" (relative to "/root/Main").)
<C++ Error> Condition "!node" is true. Returned: __null
<C++ Source> scene/main/node.cpp:1371 @ get_node()
<Stack Trace> Main.gd:8 @ _ready()
When using Wall.connect("lose_game", self , "_on_Wall_lose_game()") this one appear:
E 0:00:00.598 connect: In Object of type 'PackedScene': Attempt to connect nonexistent signal 'lose_game' to method 'Node2D._on_Wall_lose_game()'.
<C++ Error> Condition "!signal_is_valid" is true. Returned: ERR_INVALID_PARAMETER
<C++ Source> core/object.cpp:1500 @ connect()
<Stack Trace> Main.gd:8 @ _ready()
I guess i am missing something fundamental about the signals but i don´t know what it is. I’ve been looking for answers for the last two days and found a few similar questions but nothing that helped me. So if someone has already asked the same question I would like to apologize in advance and would be glad if someone could help me.
thank you in advance and kind regards
Visterface