cirnogodot/Scripts/Components/BulletSpawner.cs

using System;
using System.Collections.Generic;
using Cirno.Scripts.Resources;
using Godot;
using Godot.Collections;

namespace Cirno.Scripts.Components;

public partial class BulletSpawner : Node2D
{
    [Export] public PackedScene BulletScene;
    private GameManager _gameManager;
    
    public override void _Ready()
    {
        _gameManager = GetNode<GameManager>("/root/GameScene");
    }

    public void SpawnBullet(BulletInfo bulletInfo)
    {
        for (int i = 0; i < bulletInfo.BulletCount; i++)
        {
            var bullet = this.CreateChildOf<Bullet>(_gameManager.BulletsContainer, bulletInfo.BulletScene ?? BulletScene, bulletInfo.Position);
            
            bullet.Initialize(bulletInfo);
            
            //var bullet = BulletScene.Instantiate<Bullet>();
            //bullet.Position = bulletInfo.Position;
            //bullet.Owner = bulletInfo.Owner;
            //bullet.Speed = speed;
            
            float modifiedSpeed = bulletInfo.Modifier?.ModifySpeed(bulletInfo.Speed, i, bulletInfo.BulletCount) ?? bulletInfo.Speed;
            bullet.Speed = modifiedSpeed;

            Vector2 baseDirection = bulletInfo.Direction == Vector2.Zero ? Vector2.Right : bulletInfo.Direction.Normalized();
            float baseAngle = Mathf.Atan2(baseDirection.Y, baseDirection.X);
            //float angle = angleOffset + (360 / count) * i;
            float angle = baseAngle + Mathf.DegToRad(bulletInfo.RotationOffset + (bulletInfo.Spread / bulletInfo.BulletCount) * i);
            Vector2 bulletDirection = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle));
            //Vector2 bulletDirection = new Vector2(Mathf.Cos(Mathf.DegToRad(angle)), Mathf.Sin(Mathf.DegToRad(angle)));

            bullet.SetDirection(bulletDirection);
            //GetParent().AddChild(bullet);
        }
    }
    
    public void SpawnBullet(Vector2 position, Vector2 direction, float speed, BulletOwner owner, int count = 1, float angleOffset = 0, float spread = 0, PackedScene bulletScene = null, IBulletModifier modifier = null)
    {
        for (int i = 0; i < count; i++)
        {
            var bullet = this.CreateChildOf<Bullet>(_gameManager.BulletsContainer, bulletScene ?? BulletScene, position);
            
            //var bullet = BulletScene.Instantiate<Bullet>();
            bullet.Position = position;
            bullet.Owner = owner;
            //bullet.Speed = speed;
            
            float modifiedSpeed = modifier?.ModifySpeed(speed, i, count) ?? speed;
            bullet.Speed = modifiedSpeed;

            Vector2 baseDirection = direction == Vector2.Zero ? Vector2.Right : direction.Normalized();
            float baseAngle = Mathf.Atan2(baseDirection.Y, baseDirection.X);
            //float angle = angleOffset + (360 / count) * i;
            float angle = baseAngle + Mathf.DegToRad(angleOffset + (spread / count) * i);
            Vector2 bulletDirection = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle));
            //Vector2 bulletDirection = new Vector2(Mathf.Cos(Mathf.DegToRad(angle)), Mathf.Sin(Mathf.DegToRad(angle)));

            bullet.SetDirection(bulletDirection);
            //GetParent().AddChild(bullet);
        }
    }
    
    public void SpawnTargetedBullet(Vector2 position, Vector2 target, float speed, BulletOwner owner, PackedScene bulletScene = null, int burstCount = 1, float spread = 0, IBulletModifier modifier = null)
    {
        Vector2 direction = (target - position).Normalized();
        SpawnBullet(position, direction, speed, owner, burstCount, spread: spread, bulletScene: bulletScene, modifier: modifier);
    }
    
    [Obsolete]
    public void SpawnSpiralPattern(Vector2 position, float speed, BulletOwner owner, int bulletCount, float rotationSpeed, double time, float spread, PackedScene bulletScene = null)
    {
        float angleOffset = (float)(rotationSpeed * time);
        SpawnBullet(position, Vector2.Right, speed, owner, bulletCount, angleOffset, spread, bulletScene: bulletScene);
    }
}

public class BulletInfo
{
    public Vector2 Position { get; set; }
    public Vector2 Direction { get; set; }
    public float Speed { get; set; }
    public float LifeTime { get; set; }
    public BulletOwner Owner { get; set; }
    public int BulletCount { get; set; }
    public float RotationSpeed { get; set; }
    public float RotationOffset { get; set; }
    //public double Time { get; set; }
    public float Spread { get; set; }
    public PackedScene BulletScene { get; set; }
    public IBulletModifier Modifier { get; set; }
    public List<TimeModifier> TimeModifiers { get; set; } = new List<TimeModifier>();
}