PunchCameraModifier.cs

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using System;
using Microsoft.Xna.Framework;
 
namespace Terraria.Graphics.CameraModifiers;
 
public class PunchCameraModifier : ICameraModifier
{
    private int _framesToLast;
 
    private Vector2 _startPosition;
 
    private Vector2 _direction;
 
    private float _distanceFalloff;
 
    private float _strength;
 
    private float _vibrationCyclesPerSecond;
 
    private int _framesLasted;
 
    public string UniqueIdentity { get; private set; }
 
    public bool Finished { get; private set; }
 
    public PunchCameraModifier(Vector2 startPosition, Vector2 direction, float strength, float vibrationCyclesPerSecond, int frames, float distanceFalloff = -1f, string uniqueIdentity = null)
    {
        _startPosition = startPosition;
        _direction = direction;
        _strength = strength;
        _vibrationCyclesPerSecond = vibrationCyclesPerSecond;
        _framesToLast = frames;
        _distanceFalloff = distanceFalloff;
        UniqueIdentity = uniqueIdentity;
    }
 
    public void Update(ref CameraInfo cameraInfo)
    {
        float num = (float)Math.Cos((float)_framesLasted / 60f * _vibrationCyclesPerSecond * ((float)Math.PI * 2f));
        float num2 = Utils.Remap(_framesLasted, 0f, _framesToLast, 1f, 0f);
        float num3 = Utils.Remap(Vector2.Distance(_startPosition, cameraInfo.OriginalCameraCenter), 0f, _distanceFalloff, 1f, 0f);
        if (_distanceFalloff == -1f)
        {
            num3 = 1f;
        }
        cameraInfo.CameraPosition += _direction * num * _strength * num2 * num3;
        _framesLasted++;
        if (_framesLasted >= _framesToLast)
        {
            Finished = true;
        }
    }
}