You want to make RPG-style ability buttons, including a cooldown effect.
If you need art for your buttons, you can find a wide variety of well-designed buttons at Game-icons.net. We’ll be using a few from there for this recipe.
The scene for our ability button will need the following nodes:
AbilityButton: TextureButton Sweep: TextureProgress Timer Counter: MarginContainer Value: Label
Drop your chosen icon into the Texture property of the
Sweep node, choose “Full Rect” from the Layout menu. Set the Fill Mode to “Counter Clockwise”.
We also want our cooldown “radial wipe” to darken the button, so set the Modulate property to a dark gray with some transparency:
Timer node should be set to “One Shot”.
Counter is a container to hold and align the text. Set its Layout to “Bottom Wide”, and in its Custom Constants, both Margin Right and Margin Left to
Finally, on the
Value label, set Align to “Right” and Clip Text to “On”. Choose a font by adding a
DynamicFont and setting an appropriate size. Put a value like
0.0 in the Text field to check how it works. Since our icon is black and white, it also helps to add an Outline Size of
1 in the font’s settings.
Add a script to the
AbilityButton. Connect the
timeout signal and the
extends TextureButton onready var time_label = $Counter/Value export var cooldown = 1.0 func _ready(): $Timer.wait_time = cooldown time_label.hide() $Sweep.texture_progress = texture_normal $Sweep.value = 0 set_process(false)
We start by exporting a
cooldown variable for the length of our ability’s cooldown. Then, in the
_ready() method, we can set the
Timer to use that value. Then we hide the label, because we only want to display it during the countdown.
Next, we need a texture to assign to the
TextureProgress display. In this case, we’ll copy the texture from the button - you could also use a different texture if you like.
Finally, we make sure the sweep’s value is at
0, and set the node’s processing to
false. We’ll do the animation in
_process() so we don’t need it running when we’re not in cooldown mode.
func _process(delta): time_label.text = "%3.1f" % $Timer.time_left $Sweep.value = int(($Timer.time_left / cooldown) * 100)
_process() we use the
time_left on the timer to set the label’s
text and the sweep’s
func _on_AbilityButton_pressed(): disabled = true set_process(true) $Timer.start() time_label.show()
When the button is clicked, everything gets started.
func _on_Timer_timeout(): print("ability ready") $Sweep.value = 0 disabled = false time_label.hide() set_process(false)
And everything is reset when the timer runs out. Put several buttons in an
HBoxContainer and you’ve got an action bar:
Download the project file here: cooldown_button.zip