The command to open the Rotate/Zoom dialog can be found in the or invoked with Ctrl + Shift + Z.
The toolset allows a free rotation of a layer or selection about the three axes (X, Y, and Z).
In addition, there are panning, zooming and tiling options.
Roll / Rotate
The Roll/Rotate control allows rotations about the Z axis by dragging the outer ring.
Holding Shift while dragging the outer ring confines rotation angle to 15 degree increments.
In all cases, the rotation will be about the center point of the layer or selection.
The Center of the Roll/Rotate control (the "globe") allows rotations about the X and Y axes.
The outer ring and globe are linked. Rotating the outer ring also rotates the globe.
Panning is the action of sliding the image or selection in the same plane as the rest of the layer.
Click and drag the control or use the sliders to move the layer or selection around the canvas.
This control expands or contracts the layer or selection. Higher zoom settings increase the size of the contents of the layer or selection.
Smaller values shrink the contents of the layer or selection.
If the ☑ Tiling checkbox is checked, any portion of the layer not filled by a region under transformation will be filled with a repeating pattern of the transformed region.
If the ☐Tiling checkbox is not checked, any portion of the layer not filled by a region under transformation will be transparent.
If the ☑ Preserve Background checkbox is checked, regions of the layer not filled by the area under transformation will contain the original layer contents.
The original pixels will show through if Tiling allows.
Using the Rotate/Zoom controls allows an image to be apparently tilted and transformed as if it were at an angle to the viewer.
It is relatively easy to create the illusion of depth or perspective using these tools.