cirnogodot/Scripts/Resources/SimpleMovementPattern.cs

using Cirno.Scripts.Actors;
using Cirno.Scripts.AttackPatterns;
using Godot;

namespace Cirno.Scripts.Resources;

[GlobalClass]
public partial class SimpleMovementPattern : AttackPattern
{
    [Export] private Vector2 relativeTargetPosition;
    [Export] private float moveDuration = 2f;
    [Export] private Tween.TransitionType transitionType = Tween.TransitionType.Linear;
    [Export] private Tween.EaseType easeType = Tween.EaseType.InOut;

    private Tween tween;
    private bool isComplete = false;

    protected IScriptHost Boss;
    
    public override void Start(Node2D parent)
    {
        Parent = parent;
        if (parent is not IScriptHost boss)
            return;
        
        Boss = boss;
        tween = Parent.CreateTween();
        isComplete = false;

        Vector2 targetPosition = (Boss?.HomePosition ?? Parent.GlobalPosition) + relativeTargetPosition;
        
        boss.ChangeSpriteDirection(-(Parent.GlobalPosition - targetPosition));
        tween.TweenProperty(Parent, "global_position", targetPosition, moveDuration)
            .SetTrans(transitionType)
            .SetEase(easeType)
            .Finished += () =>
        {
            isComplete = true;
            boss.ChangeSpriteDirection(Vector2.Zero);
        };
    }

    public override void UpdatePattern(double delta) { }

    public override bool IsComplete()
    {
        return isComplete;
    }
}