getting_started/first_2d_game/06.heads_up_display #69
giscus[bot]
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Replies: 43 comments 74 replies
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In the last part about "removing old creeps" the newest version of Godot now supports global and scene groups. |
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Thank you |
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I don't understand 😕 is this option important? when i need to use it? |
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C# users must change the connections under the Node tab to C# nomenclature, not the default it provides you. Change these: _on_start_button_pressed to: OnStartButtonPressed or, if you've already created the script as guided, you can select the Pick button to the right of the text field when editing the connection, and then select the appropriate method. |
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why am i not able to connect start_game signal of HUD node to new_game() function of Main node? |
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Make sure you have a signal start_game in your HUD script. The connect the start button pressed node to you script to create the func _on_start_button_pressed(): function. And in the function you need the start_game.emit() to send the signal. |
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The main scene from which the game starts can be set under: |
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when i am trying to connect start_game signal of HUD node to new_game() function of Main node , I can't find the function new_game() in the options in the pop? |
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Did you write signal start_game in top of hud.gd script ? |
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Make sure you're in the HUD node under Main, not accidentally looking at your HUD scene. |
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I was having this problem too, I had neglected to save my hud.tscn again after creating the signal, so the instance of hud.tscn under the main scene did not have it. I saved it and it worked fine, and I spent far too long figuring that out. |
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When I create a new group named "mobs" and use the code to clear all mobs, the Player and the HUD are also cleared. I assume the problem is that they are being included the in mobs group, but I have no idea how this group is supposed to know what is inside it anyway. How do I make sure the "mobs" group only contains instances of Mob? |
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I have now looked up groups in the Godot documentation and found commands for adding Nodes to a group. By adding the line: mob.add_to_group("mobs") to the end _on_mob_timer_timeout() function, I can be sure all mobs that are created are added to the "mobs" group. I then unselected the "mobs" group in Main node so that Main was not in the "mobs" group any more. This fixed my problem. |
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After reading some of the comments, what it worked for me was :
I don't think that you need to do call |
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I had a related issue. Mobs were not being removed from the scene even though I had created the scene group and called "queue_free" on the group. It turns out I had the VisibleOnScreenNotice2D node in the mob scene selected when I created the mob scene group, so the notification nodes were getting added to the group but NOT the root mob node. Checking the mobs scene group in the root mob node and unchecking it in the children resolved the issue. Just in case anyone else ends up here with a related issue again. :) |
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Something breaking down between my _on_start_button_pressed and new_game, not sure what I'm missing. Tried disconnecting and reconnecting, but no change. new_game triggers fine if I have _ready call it. I'm seeing the debug print I added for the start button press. Best I can tell is the signal isn't being emitted. Anyone have an idea what's breaking down? Here's my _on_start_button_pressed: func _on_start_button_pressed():
print("Debug: Start Button pressed")
$StartButton.hide()
start_game.emitHere's my new_game: func new_game():
print("Debug: new_game called")
score = 0
$Player.start($StartPosition.position)
$StartTimer.start()
$HUD.update_score(score)
$HUD.show_message("Get Ready") |
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Have you connected the start_game() signal from your HUD node to the new_game() function in main.gd? You can check if they are connected by selecting the HUD node in your main scene and looking at its signals in the right hand panel (in this panel, select "Node" from "Inspector"/"Node"/"History", and then make sure you are on "Signals" not "Groups"). At the top of the list of signals you should see the hud.gd category, and underneath it start_game(). In my scene, there is a green arrow underneath start_game() that points to new_game(). If this connection isn't there, here is the line from the tutorial above that explains how to make the connection: If the connection is there and is spelled correctly, I don't know what is going wrong. |
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Unfortunately I have; that's why I'm confused. Looks like it's time to join the Discord! |
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I was just missing the () after emit. Whoops! |
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I was crashing with an error that it couldn't find "$HUD.update_score(score)" and I had to poke around for the solution. Mine was named #hud and not #HUD. Case matters apparently, because I fixed the case and the game works fine. Hope that makes sense and helps someone. |
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ohhh I did mine the same way as all my other Nodes Hud. I was so confused about why it was breaking, of course it was a syntax error. |
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So I worked through this over a couple of days and I was a bit confused at the end because I realized that I never added my mob scene to the Main tree. So I was left wondering "how the f is this even connected?" Of course it was a bit simple to solve by simply going backwards. But I wonder if it would be useful to show the mob scene in the tree somehow. Basically to show its being used by Mobpath. Maybe this would be good for a small game like this, and would be problematic in a complicated scene. |
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it isn't that the the mob scene uses all this happens in the
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Hi all, I have having an issue after pressing Start button. Error message: Attempt to call function 'start' in base 'null instance' on a null instance. There seems to be an issue with the message timer activation. 3 things were called onto the stack frames and the corresponding code below:
func show_message(text):
$Message.text = text
$Message.show()
$MessageTimer.start()
func new_game():
score = 0
$Player.start($StartPosition.position)
$StartTimer.start()
$HUD.update_score(score)
$HUD.show_message("Get Ready")
get_tree().call_group("mobs", "queue_free")
func _on_start_button_pressed():
$StartButton.hide()
start_game.emit()Can anyone share where I went wrong? |
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1 extra S in the $MessageTimer.start() haha |
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Did you figure out the issue? Because just1and0s is just lying? |
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They are the original poster, so I'm guessing they just edited their own post above to have the correct syntax. |
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Created by just1and0s - September 8th. Maybe the code was fixed and now you don't see the mistake that has been made in the first place? |
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The instructions say to extend HUD from CanvasLayer. But if I do I get this error: script inherits from native type ‘area2d’ so it cannot be instanced in object of type node Changing it to "extends Node" works - I found a similar question posed online too so I was surprised not to see a similar comment here. |
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which version of Godot are you using? |
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v4.3.stable.official [77dcf97d8] However, when I used the project files downloaded from the site, and fixed a couple of things because they didn't support 4.3, it works using "extends Canvas Layer". So I'm going to assume I did something wrong earlier and that is the real error. |
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strange, I used the same version and the same assets and everything in the tutorial worked fine |
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I was running into a similar problem It turned out that my Main.gd node had |
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Oops, never mind, I was looking at the wrong script and can't edit my comment. I don't know why I'm getting the issue. I'm on v4.3.stable.mono.arch_linux |
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Hello I am having some issues with my scripts breaking at the start_game.emit()portion of the code. I have added signal start_gameto the top of the HUD.gd script, under extends CanvasLayer, and linked the start game signal from later in the hud.gd script func _on_start_button_pressed():
$StartButton.hide()
start_game.emit()to the new_game() function in the main.gd script func new_game():
score = 0
$Player.start($StartPosition.position)
$StartTimer.start()
$HUD.update_score(score)
$HUD.show_message("Get Ready")
get_tree().call_group("mobs", "queue_free")Despite seemingly following the instructions, when I press the start button the game crashes, and the debugger identifies the line with start_game.emit() as the point where the code breaks. Can anyone tell me what I am doing wrong? |
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I deleted the line containing start_game.emit()and replaced it with start_game.emit()and it seems to work now, despite looking exactly the same to my eyes. I think there was some kind of hidden character messing it up or something. |
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I also had to start the $ScoreTimer.start()
$MobTimer.start() |
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Eesh, sorry, I should have previewed that before I sent it. Can't seem to edit it now. So anyway, here's my func new_game():
get_tree().call_group("mobs", "queue_free")
score = 0
$Player.start($StartPosition.position)
$HUD.update_score(score)
$HUD.show_message("Get Ready")
$StartTimer.start()
$ScoreTimer.start()
$MobTimer.start()And this is connected the the |
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did you have your from there you have to connect that timer's func _on_start_timer_timeout():
$MobTimer.start()
$ScoreTimer.start()after the set wait time passes for |
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Thanks to Calinou, |
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I'm pretty sure I followed all the instructions but for some reason the score wont update. It merely stays at zero |
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I am having the same issue. |
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nvm. i got it. i was having issues with the timeout function. |
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What was the solution that you came to? I am having the same issue. All of my timers are connected to the Main node and the MobTimer and ScoreTimer are started with the StartTimer. |
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I hope yall synced with per second counter, score+=1 |
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I'm having the same problem as well. If anyone else has the same issue, or knows of a fix, I would love to hear it. |
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When trying to make a signal from hud - start_game() to Main - new_game(). In the Connect a Signal to a method window I select Main (root node), but in the Select Method window the new_game() function is not appearing even though the main.tscn file is attached to the Main node. So I cant make the signal work. I have a working Player hit signal so I don't know what the Issue is. See: https://i.imgur.com/suCspm4.jpeg Using Godot Engine v4.3.stable.official [77dcf97d8] |
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I am so stupid. I checked my attached script in main.tscn and it was using "hud.gd", not "main.gd". If you get my issue double check your main.tscn file has "main.gd" attached. Glad I figured it out though. |
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OMG this saved me. I did the exact same thing! |
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I had a rather trivial question on the function design here: In this function, the callee This approach makes sure that the usage of $MessageTimer only stays inside the |
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I'm really new to godot so perhaps it's a stupid question: |
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The "hit" signal should be connected to the game_over function in the Main node. You can confirm by selecting the Player Node and checking the "Node" tab on the right. The handler "game_over" should be under "hit()". If it's not, |
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Just a tip, when I encounter bugs (as I did on the last two sections) it helped me to compare my GDscript code to the tutorial code from the Github link they shared. For whatever reason there have been a couple of instances where I totally left out lines of code in a function for some reason, and just comparing my functions to the Github code has been a quick and easy way to tell if I just missed something or mistyped something. |
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My God I actually finished it. I have no training or coding skills but still can't shake a fascination with it. But I changed it so player turns in whatever direction they're going, also changed $HUD.show_game_over() to $HUD.show_message("Game Over"), where you can put whatever text you want there. There is one problem: none of the creeps are moving. They spawn randomly along the path, and animate correctly, but don't go anywhere. The "Game Over" works when I run into them, but they're paralyzed. Did this happen with anyone else? Does it have to do with paths? Here's the code I have for that section, I'd appreciate any help: func _on_mob_timer_timeout() -> void:
# create a new instance of the scene
var mob = mob_scene.instantiate()
# Choose a random location on Path2D.
var mob_spawn_location = $MobPath/MobSpawnLocation
mob_spawn_location.progress_ratio = randf()
# Set the mob's direction perpendicular to the path direction.
var direction = mob_spawn_location.rotation + PI / 2
# Set the mob's position to a random location
mob.position = mob_spawn_location.position
# Add some randomness to the direction.
direction += randf_range (-PI / 4, PI / 4)
mob.rotation = direction
# Choose the velocity for the mob
var velocity = Vector2(randf_range(150.0, 250.0), 0.0)
add_child(mob) |
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You have declared the value of var velocity, but seem to be missing a step to assign it to the mob after the declaration: |
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Thank you so much, you're a lifesaver. That worked. Don't know how I missed it after scrutinizing everything so acutely. |
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help me i have a problem with the player being invisible in-game and when in title screen the player is visible here is my code # player.gd
extends Area2D
signal hit
@export var speed = 400 # How fast the player will move (pix/sec)
var screen_size # Size of the game window.
func _ready():
screen_size = get_viewport_rect().size
show()
func _process(delta):
var velocity = Vector2.ZERO # The player's movement vector
if Input.is_action_pressed("move_right"):
velocity.x += 1
if Input.is_action_pressed("move_left"):
velocity.x -= 1
if Input.is_action_pressed("move_down"):
velocity.y += 1
if Input.is_action_pressed("move_up"):
velocity.y -= 1
if velocity.length() > 0:
velocity = velocity.normalized() * speed
$AnimatedSprite2D.play()
else:
$AnimatedSprite2D.stop()
position += velocity * delta
position = position.clamp(Vector2.ZERO, screen_size)
if velocity.x < 0:
$AnimatedSprite2D.flip_h = true
else:
$AnimatedSprite2D.flip_h = false
func _on_body_entered(_body: Node2D) -> void:
pass # Replace with function body.
hide() # Player disappears after being hit
hit.emit()
# Must be deferred as we can't change physics proprierties on a physics callback.
$CollisionShape2D.set_deferred("disabled", true)
func start(pos):
position = pos
show()
$CollisionShape2D.disabled = false# main.gd
extends Node
@export var mob_scene: PackedScene
var score
func game_over():
$ScoreTimer.stop()
$MobTimer.stop()
$HUD.show_game_over()
$Music.stop()
$DeathSound.play()
func new_game():
score = 0
$Player.start($StartPosition.position)
$StartTimer.start()
$HUD.update_score(score)
$HUD.show_message("Get ready!")
$Music.play()
get_tree().call_group("mobs", "queue_free")
func _on_score_timer_timeout():
score += 1
$HUD.update_score(score)
func _on_start_timer_timeout():
$MobTimer.start()
$ScoreTimer.start()
func _on_mob_timer_timeout():
# Create a new instance of the Mob scene.
var mob = mob_scene.instantiate()
# Choose a random location on Path2D.
var mob_spawn_location = $MobPath/MobSpawnLocation
mob_spawn_location.progress_ratio = randf()
# Set the mob's direction perpendicular to the path direction.
var direction = mob_spawn_location.rotation + PI / 2
# Set the mob's position to a random location.
mob.position = mob_spawn_location.position
# Add some randomness to the direction.
direction += randf_range(-PI / 4, PI / 4)
mob.rotation = direction
# Choose the velocity for the mob.
var velocity = Vector2(randf_range(150.0, 250.0), 0.0)
mob.linear_velocity = velocity.rotated(direction)
# Spawn the mob by adding it to the Main scene.
add_child(mob) |
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I think it's because when velocity is 0 you stop animation? Maybe try playing an "idle" animation. |
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But I'm often wrong. 😆 |
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Hi I am having problem with the Start button, It does nothing when I press it. My Main: extends Node
@export var mob_scene: PackedScene
var score
func game_over():
$MobTimer.stop()
$ScoreTimer.stop()
$HUD.show_game_over()
func new_game():
get_tree().call_group("mobs", "queue_free")
score = 0
$Player.start($StartPosition.position)
$StartTimer.start()
$HUD.update_score(score)
$HUD.show_message("Get Ready")
func _on_score_timer_timeout():
score += 1
$HUD.update_score(score)
func _on_start_timer_timeout():
$MobTimer.start()
$ScoreTimer.start()
func _on_mob_timer_timeout():
# Create a new instance of the Mob scene.
var mob = mob_scene.instantiate()
# Choose a random location on Path2D.
var mob_spawn_location = $MobPath/MobSpawnLocation
mob_spawn_location.progress_ratio = randf()
# Set the mob's direction perpendicular to the path direction.
var direction = mob_spawn_location.rotation + PI / 2
# Set the mob's position to a random location.
mob.position = mob_spawn_location.position
# Add some randomness to the direction.
direction += randf_range(-PI / 4, PI / 4)
mob.rotation = direction
# Choose the velocity for the mob.
var velocity = Vector2(randf_range(150.0, 250.0), 0.0)
mob.linear_velocity = velocity.rotated(direction)
# Spawn the mob by adding it to the Main scene.
add_child(mob)my HUD: extends CanvasLayer
# Notifies `Main` node that the button has been pressed
signal start_game
func show_message(text):
$Message.text = text
$Message.show()
$MessageTimer.start()
func show_game_over():
show_message("Game Over")
# Wait until the MessageTimer has counted down.
await $MessageTimer.timeout
$Message.text = "Dodge the Creeps!"
$Message.show()
# Make a one-shot timer and wait for it to finish.
await get_tree().create_timer(1.0).timeout
$StartButton.show()
func update_score(score):
$ScoreLabel.text = str(score)
func _on_start_button_pressed():
$StartButton.hide()
start_game.emit()
func _on_message_timer_timeout():
$Message.hide()
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Did you connect the |
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yeah that was it. Thanks a lot. |
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I just wanted to state my issue and how I resolved it for anyone who may have been dealing with the same thing. When trying to get the script to delete the old creeps by using the call group function to have them cleared from queue, it was not working for me in the new game function. I remedied by adding the same line of code to the game over function and it works like a charm. |
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Mine is saying the identifier "score" is not declared on my HUD.gd script but works fine on my main. any ideas? |
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I got it. its because I had: func update_score(): Instead of: |
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I keep running into the error of A, my message will not go away after the game starts that says get ready, and B: when my player hits an enemy I get this error: Invalid call. Nonexistent function 'set_deffered' in base 'CollisionShape2D'. |
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I got rid of the line on player.gd under the function _on_body_entered() talking about the set_differed and what not and that helped. Might cause bugs though, not sure. No idea yet still on why my get ready message won't go away |
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Guys never fear, I will save you a lot of stress and time. I also had the issue connecting my start_game() signal to new_game(). I went through all these comments and used chatGPT for literally 4 or more hours or more before I finally resolved the issue. So go ahead and try all the above suggestions as they might help. But if you are emitting the signal, and you do have all your scripts correctly written than maybe you had the same problem I had. When I dragged the Hud scene into the Main Node it replaced the main nodes script with the HUD script. Anyway, there is no way to tell this without looking at the inspector. Click on your node, go to the bottom of the inspector, make sure the correct script is associated to that node. |
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You just saved me a ton of time. I followed the guide and tried all the other methods listed above, but the problem was that I didn't attach my HUD.gd script to the HUD node when I instantiated it into Main.tscn |
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C# question: Is there a way to connect a signal's emission to a method that does I have the following for the "Game Over" method in the Main scene's script, private async void GameOver()
{
GetNode<Timer>("MobTimer").Stop();
GetNode<Timer>("ScoreTimer").Stop();
await GetNode<HUD>("HUD").ShowGameOverAsync();
}The issue is if you declare it as
Here's My "Show Game Over" method in the HUD scene: public async Task ShowGameOverAsync()
{
ShowMessage("Game Over");
Timer messageTimer = GetNode<Timer>("MessageTimer");
await ToSignal(messageTimer, Timer.SignalName.Timeout);
Label message = GetNode<Label>("Message");
message.Text = _defaultMessageText;
message.Show();
await ToSignal(GetTree().CreateTimer(1.0), SceneTreeTimer.SignalName.Timeout);
GetNode<Button>("StartButton").Show();
} |
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"Get ready!" wouldn't disappear for me after pressing the start button. I got it to work by going to the HUD tab at the top (hud.tscn), clicking on MessageTimer, and connecting it to HUD with a timeout() signal. |
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If you can't get the score to increase, make sure you're using "score += 1" instead of "score =+ 1" like I did. hud.gd should look like this func update_score(score):
score += 1
$ScoreLabel.text = str(score)And main.gd should look like this func _on_score_timer_timeout():
score += 1
$HUD.update_score(score) |
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My score timer briefly pauses and then keeps going up after a game over, as if I was still playing. It does reset back to 0 when I press start again. Any advice? I can provide my code if needed. Here's my main.gd extends Node
@export var mob_scene: PackedScene #selects the mob scene we want to insance
var score
func _ready(): #can use new_game to test out the game
pass
func game_over(): #handles game over
$ScoreTimer.stop()
$MobTimer.stop()
$HUD.show_game_over()
$Music.stop()
$DeathSound.play()
func new_game(): #starts new game
score = 0
$Player.start($StartPosition.position)
$StartTimer.start()
$HUD.update_score(score)
$HUD.show_message("Get ready!")
get_tree().call_group("mobs", "queue_free") #calls mob to delete itself
$Music.play()
func _on_mob_timer_timeout():
var mob = mob_scene.instantiate() #creates new instance of mob scene
var mob_spawn_location = $MobPath/MobSpawnLocation #choose random location on Path2D
mob_spawn_location.progress_ratio = randf()
var direction = mob_spawn_location.rotation + PI / 2 #sets mob direction perpendicular to path direction
mob.position = mob_spawn_location.position #sets mob position to random location
direction += randf_range(-PI / 4, PI / 4) #Add randomness to direction
mob.rotation = direction
var velocity = Vector2(randf_range(150.0, 250.0), 0.0) #choose mob velocity
mob.linear_velocity = velocity.rotated(direction)
add_child(mob) #spawn mob by adding it to scene
func _on_score_timer_timeout(): #increases score by 1
score += 1
$HUD.update_score(score)
func _on_start_timer_timeout(): #the start timer will start the other 2 timers
$MobTimer.start()
$ScoreTimer.start() |
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Thanks for the quick, detailed response. I'll backup all my code first, then I'll try out your solutions and share what happens. |
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I created a repository (Squid-James-actual) on Github and made it public. For beginners reading this, I found a good tutorial on how to make a Github repository using Godot I edited my code to make it look like yours, but it looks like the timer keeps ticking even after game over. Here's what the debug statements looked like: Score Timer Tick: 0 I don't know if this is connected or if I'm just adding a new problem to the list, but the score timer also ticks up to 1 when "Get ready!" displays. I click the start button, the timer immediately ticks up to 1, the timer stays paused at 1 until the mob spawns in, and then the timer continues ticking once the mob spawns. Edit: The mob keeps swimming around even after you get the game over message, and continues swimming until you press the start button again. I like this effect and I think I want to keep it, but is it possible that the mob swimming around after game over is causing the score timer to keep ticking? |
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I am having the same issue. I am unsure what is going on. I am curious if someone finds a solution. |
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I figured out what was going on. You have to stop the $StartTimer in game_over() func game_over() -> void:
$StartTimer.stop() # Ensure start timer is stopped
$ScoreTimer.stop()
$MobTimer.stop()
$Music.stop()
$DeathSound.play()
$HUD.show_game_over()In the original setup, game_over() correctly stopped $ScoreTimer and $MobTimer, but $StartTimer was still running. Once it timed out, it triggered _on_start_timer_timeout(), which included: func _on_start_timer_timeout() -> void:
$MobTimer.start()
$ScoreTimer.start() # This restarted the ScoreTimer after game overThis effectively undid the stop command from game_over() |
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I think I found the source of our issue. In the previous section The main game scene it is mentioned when setting up the timers
With that change then everything works as expected and you don't need to add the extra stop I mentioned above. |
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I just spent literal hours trying to get to the bottom of this following issue, with no success. Basically, I don't understand why I'm getting this automatically attached signal (the yellow one): Due to this connection I can't disconnect, and due to using the following method, the game would end up in a stack overflow every time I pressed the "Start Game" button: Renaming the method as follows got rid of the issue: The yellow connection remains there though, no matter what. In the sample project from the GODOT github it doesn't exist. If anyone has any idea why this might be happening in my case, I'd appreciate the help! |
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I found out what my mistake was: I had connected the start_game() signal from the HUD to the on_start_button_pressed(), so it was connected in two places that would keep calling each other thus triggering an infinite loop. |
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I am throwing an error that the "Attempt to call function 'update_score' in base 'null instance' on a null instance". The error throws at the code. ChatGPT hasn't been super helpful. I noticed this first after the "Connecting HUD to Main" section of this part of the tutorial. I have gone back through and I think I instantiated the Child Scene correctly to connect HUD to Main. I am new to all this and maybe made other mistakes along the way (such as not writing this code under the function. Any advice or fixes would be super helpful! |
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getting_started/first_2d_game/06.heads_up_display
The final piece our game needs is a User Interface (UI) to display things like score, a "game over" message, and a restart button. Create a new scene, click the "Other Node" button and add a Canvas...
https://docs.godotengine.org/en/stable/getting_started/first_2d_game/06.heads_up_display.html
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