this post was submitted on 14 Jun 2024
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31
Implementing triggered abilities (self.godot)
submitted 6 months ago by Jozzo to c/[email protected]
6 comments fedilink hide all child comments
 

For character abilities that have a certain trigger condition, eg. "OnAttack", "OnJump", "OnDamaged" etc..

Currently each of these triggers is a signal. When a signal fires, the character loops through all of its abilities and activates each one with that specific condition, so it just runs an if statement for every ability, regardless of whether it has that condition or not:

if ability.trigger_condition == Triggers.OnAttack:
  ability.activate()

My issue is that this could get a little unscalable with many characters on-screen each having many abilities of their own. A character could have 1 OnDamaged ability and 19 OnAttack abilities, but when an "OnDamaged" signal is received, it will still loop through all 19 OnAttack abilities.

Any advice on this is appreciated, thank you all.

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[–] Jozzo 2 points 5 months ago

I patched together some version of this using nested dictionaries:

var abilities: Dictionary = {
	AbilityData.Trigger.BEFORE_ATTACK : {},
	AbilityData.Trigger.ON_ATTACK : {},
	AbilityData.Trigger.ON_HIT : {},
	AbilityData.Trigger.ON_KILL : {},
	AbilityData.Trigger.ON_DEATH : {},
	AbilityData.Trigger.ON_JUMP : {},
	AbilityData.Trigger.PASSIVE : {}
}

with each value being another key:value pair of { "ability_id": <ability-node> } so I can keep a reference to the Ability node and use dictionary functions like .has() to check if a character has a specific ability:

func has_ability(ability_data: AbilityData) -> bool:
	if abilities[ability_data.trigger_type].has(ability_data.id):
		return true
	return false

Then when a trigger fires, it calls this (I omitted the return code):

// Activates all abilities with the specified trigger type. Returns an array containing each ability that was activated this way.
//trigger_type is an enum
//data is just a resource containing things like position, target, ability owner, etc
func trigger(trigger_type: AbilityData.Trigger, data: AbilityActivationData) -> Array[Ability]:
	var abilities_to_activate: Dictionary = abilities.get(trigger_type)
	
	// Loops through the list of Ability nodes.
	for ability in abilities_to_activate.values():
		ability.activate(data)
		abilities_activated.append(ability)

This seems to work, but it still gives me that tickling sensation that it could be a little cleaner.