BloodAndGore/Assets/Scripts/CameraFX.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Saltosion.OneWeapon {
    [RequireComponent(typeof(Camera))]
    public class CameraFX : MonoBehaviour {
        public Transform Player;
        public Transform ShakeHandle;

        public bool DebugShake = false;
        public bool DebugSlowDown = false;

        private Camera Camera;
        private Vector3 Offset;

        private float ScreenShakeTime = 0.0f;
        private float ScreenShakeIntensity = 0.0f;
        private float TimeStopCooldown = 0.0f;

        private void Start() {
            Camera = GetComponent<Camera>();
            Offset = transform.position;
        }

        private void Update() {
            if (DebugShake) {
                DebugShake = false;
                ScreenShake(10f);
            }
            if (DebugSlowDown) {
                DebugSlowDown = false;
                StopFor(10f);
            }

            if (TimeStopCooldown > 0) {
                TimeStopCooldown -= Time.deltaTime / Time.timeScale;
                if (TimeStopCooldown <= 0) {
                    Time.timeScale = 1.0f;
                }
            }

            Vector2 TargetPosition = (Player.position + Camera.ScreenToWorldPoint(Input.mousePosition)) / 2.0f;
            transform.position = Vector3.Lerp(transform.position, TargetPosition, 5f * Time.deltaTime / Time.timeScale) + Offset;

            if (ScreenShakeTime > 0) {
                ScreenShakeTime -= Time.deltaTime;
                ShakeHandle.localPosition = new Vector2(Random.value, Random.value) *
                    Mathf.Pow(ScreenShakeTime, 2f) * ScreenShakeIntensity * Random.value;
            }
        }

        public void StopFor(float seconds) {
            Time.timeScale = 0.05f;
            TimeStopCooldown = seconds;
        }

        public void ScreenShake(float intensity) {
            ScreenShakeIntensity = intensity;
            ScreenShakeTime = 0.2f;
        }
    }
}