The View | Zoom Realtime command zooms in and out as the mouse is dragged up and down or when the mouse wheel is moved.
To use this feature, choose the View
| Zoom Realtime command or click the 
button
to enter zoom
mode. The cursor changes to 
when in
zoom realtime mode. Left-click in the Viewer
window, hold down the left mouse button and then drag it up or down
in the Viewer window to zoom in
or out. As you drag the mouse up, the screen is zoomed in. As you drag
the mouse down, the screen is zoomed out. You can also use the mouse wheel
to zoom in or out. Move the wheel away from you to zoom in and toward
you to zoom out.
Hold down the SHIFT key and the left mouse button and then drag the mouse around to pan the view. Alternatively, use the View | Pan command to pan the Viewer window.
These mouse controls can be customized on the Mouse page of the Tools | Options dialog.
To exit the zoom realtime mode, press the ESC key on the keyboard. The trackball mode becomes active.
Changing the zoom level cannot be undone.
See Also