When zooming the zoom rate specifies how large a unit will be after on both axes compared to before the zoom. This means that a zoom rate of 1 will make no change. A zoom rate of 2 will double the size on both axes while a zoom rate of 0.5 will half the size of both axes. MajorZoomIn and MajorZoomOut are used when zooming in and out normally, while MinorZoomIn and MinorZoomOut are used when zooming in and out when Shift is held down.

When stepping up, down or sideways, the step size indicates how much is stepped as fraction of the image size, i.e. 0.1 means that each step is 10% of the image size. MajorStepSize is used when stepping normally, while MinorStepSize is used when stepping with Shift held down.

When zooming in or out with the mouse scrolling wheel or similar, the zoom rate specifies how large a unit will be after on both axes compared to before the zoom. This means that a zoom rate of 1 will make no change. A zoom rate of 2 will double the size on both axes while a zoom rate of 0.5 will half the size of both axes.