Scene Navigation Zoom Tracking

In my last post I began working on a 2D scene manipulation system for an upcoming project. One of the design goals was to have a "smart zoom" feature which would track to where the mouse was. This is one of my favorite scene navigation tools as all I had to do to focus on a particular area was put my mouse in the center of that area and zoom in. I could also "pan" around the view by zooming out/in while moving my mouse around. Two applications that I know have this feature off the top of my head are SolidWorks and Eagle, though I really wish this feature was in all applications which require any type of scene navigation. I didn't have this feature implemented last time because I wasn't quite sure how to do it. However, I have since figured out how this feature can be implemented.

A Better 2D Scene Manipulation Widget for Qt

Introduction

I'm currently working on a project which requires a good 2D scene manipulation system. The application is being built with the Qt C++ framework. Initially I investigated using the base QGraphicsView class, but it really doesn't have the functionality I want so I'll have to roll my own solution somehow (either extend it or start from scratch).

For those curious as to what I want the ultimate look and feel to resemble, my inspiration for this design is based loosely off of other interfaces I've been highly impressed with. The two best similar type of interfaces I've used are the Blender and SolidWorks user interfaces. These programs are designed to work predominantly with 3D viewports, but my application only requires a 2D viewport. More details on the actual project will hopefully come later, depending on how committed I am to this project.