Camera dragging with mouse

I have 2D mesh in the XY plane. I have the following script which moves the camera across the plane, the camera starts at (0,0,-10).

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. public class DragMap : MonoBehaviour {
5.     private float dist;
6.     private Vector3 MouseStart;
7.     private Vector3 derp;
8.     void Start () {
9.         dist = transform.position.z;  // Distance camera is above map
10.     }
11.     void Update () {
12.         if (Input.GetMouseButtonDown (2)) {
13.             MouseStart = new Vector3(Input.mousePosition.x, Input.mousePosition.y, dist);
14.             MouseStart = Camera.main.ScreenToWorldPoint (MouseStart);
15.             MouseStart.z = transform.position.z;
16.         }
17.         else if (Input.GetMouseButton (2)) {
18.             var MouseMove = new Vector3(Input.mousePosition.x, Input.mousePosition.y, dist);
19.             MouseMove = Camera.main.ScreenToWorldPoint (MouseMove);
20.             MouseMove.z = transform.position.z;
21.             transform.position = transform.position - (MouseMove - MouseStart);
22.         }
23.     }
24. }

But I cannot for the life of me figure out what to change so that if I drag my mouse to the right, the camera goes to the left and vice versa. Similarly if I drag my mouse up I want to move the camera down and vice versa. Help!

Thank you for any replies.

-DrOmega.

 

When you use '(MouseMove - MouseStart)' you create a delta vector that shows the difference between where you started and where the mouse is now. You can simply negate the contents of the x and y components to reverse how the camera moves. If you want to negate both you could change it to '(MouseStart - MouseMove)' instead.