MattRix

using UnityEngine;
using System.Collections;
using System;

//based on the code in this post: http://martinecker.com/martincodes/unity-editor-window-zooming/
//but I changed how the API works and made it much more flexible
//usage: create an EditorZoomer instance wherever you want to use it (it tracks the pan + zoom state)
//in your OnGUI, draw your scrollable content between zoomer.Begin() and zoomer.End();
//you also must offset your content by zoomer.GetContentOffset();