using Godot;
 
/// <summary>
/// 高速子弹
/// </summary>
public class HighSpeedBullet : Bullet
{
    [Export] public PackedScene Hit;
    //射线检测节点
    private RayCast2D RayCast2D;
    //最大飞行距离
    private float Distance;
    private Line2D Line;
    private float ca = 1;
 
    public void InitData(float distance, Color color)
    {
        RayCast2D = GetNode<RayCast2D>("RayCast2D");
        Line = GetNode<Line2D>("Line");
        Distance = distance;
        Modulate = color;
 
        Vector2 targetPos = new Vector2(distance, 0);
 
        //
        RayCast2D.CastTo = targetPos;
        RayCast2D.ForceRaycastUpdate();
        if (RayCast2D.IsColliding()) { //碰到物体
            Vector2 collPosition = RayCast2D.GetCollisionPoint();
            Node2D hit = Hit.Instance<Node2D>();
            hit.RotationDegrees = MathUtils.RandRangeInt(0, 360);
            hit.GlobalPosition = collPosition;
            GetTree().CurrentScene.AddChild(hit);
            //划线的点坐标
            Line.SetPointPosition(1, new Vector2(Line.GlobalPosition.DistanceTo(collPosition), 0));
        }
        else
        {
            //划线的点坐标
            Line.SetPointPosition(1, targetPos);
        }
        RayCast2D.Enabled = false;
    }
 
    public override void _Process(float delta)
    {
        ca -= 12 * delta;
        if (ca <= 0) {
            QueueFree();
            return;
        }
        Color c = Modulate;
        c.a = ca;
        Modulate = c;
    }
}