Cornerstone has a series of tools. The OHIF Viewer (the flagship app that Cornerstone was written for) exposes most of them in a toolbar:

but they can also be as simple as mouse gestures

Add something subset of tools to our renderer (#24). A static image is fine for a png, jpg, or tiff, but for NIfTIs, which are usually 3d, and sometimes 4d, it would be a lot more friendly if users could at least:

• stack scroll
• pan
• zoom

without having to download the dataset and switch to fsleyes or ITK Snap.