Whether the entire view port is limited.
Cleanup the camera rig.
Pan By a certain amount. (delta is in the viewport coordinate system)
Pan to a certain point. (target is in the world coordinate system)
Rotate by a certain amount.
Rotate to a certain angle.
Setup the camera rig.
Zoom by a certain amount with respect to the center of the viewport.
Zoom by a certain amount at a certain point. The point is in the viewport coordinate system.
Zoom by a certain amount with respect to a point in the world coordinate system.
Zoom to a certain zoom level with respect to the center of the viewport.
Zoom to a certain zoom level at a certain point. The point is in the viewport coordinate system.
Zoom to a certain zoom level with respect to a point in the world coordinate system.
The camera rig.
This is a consolidated handler function for pan, zoom and rotation. Essentially, it is a controller that controls the camera, so you don't have to figure out some of the math that is involved in panning, zooming and rotating the camera.