rimworld-animation-studio/Assets/Scripts/Managers/CameraController.cs

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

namespace RimWorldAnimationStudio
{
    public class CameraController : MonoBehaviour
    {
        private Camera cam;

        [Header("Scroll controls")]
        public float scrollSpeed = 100f;

        [Header("Zoom controls")]
        public float zoom = -5f;
        public float minZoom = -3f;
        public float maxZoom = -15f;

        [Header("Max bounds")]
        public float maxBoundsXAxis = 30;
        public float maxBoundsYAxis = 30;

        private float x;
        private float y;

        private float curZoom;
        private bool mouseDragActive = false;
        private Vector3 mouseDragOrigin;

        private void Start()
        {
            x = transform.position.x;
            y = transform.position.y;

            curZoom = zoom;

            transform.position = new Vector3(transform.position.x, transform.position.y, -10);
            cam = this.GetComponent<Camera>();
        }

        private void Update()
        {
            if (Input.GetMouseButton(2))
            { StartMouseDrag(); }

            else if (Input.GetMouseButtonUp(2))
            { ResetMouseDrag(); }

            curZoom += Input.GetAxis("Mouse ScrollWheel") * scrollSpeed * 0.1f;
            curZoom = Mathf.Clamp(curZoom, maxZoom, minZoom);

            Vector3 cameraPosition = Vector3.Lerp(transform.position, new Vector3(x, y, -10), 0.2f);
            transform.position = cameraPosition;
            cam.orthographicSize = Mathf.Abs(curZoom);
        }

        public void SetPosition(Vector3 position)
        {
            x = position.x;
            y = position.y;

            transform.position = position;
        }

        public void SetZoom(float zoom)
        {
            this.zoom = Mathf.Clamp(zoom, maxZoom, minZoom);
        }

        public void StartMouseDrag()
        {
            Vector3 delta = cam.ScreenToWorldPoint(Input.mousePosition) - cam.transform.position;

            if (mouseDragActive == false)
            {
                mouseDragActive = true;
                mouseDragOrigin = cam.ScreenToWorldPoint(Input.mousePosition);
            }

            cam.transform.position = mouseDragOrigin - delta;
        }

        public void ResetMouseDrag()
        {
            mouseDragActive = false;
        }

        public void ResetCamera()
        {
            cam.transform.position = new Vector3(0, 0, -10);
            curZoom = zoom;

            mouseDragActive = false;
        }
    }
}