Two types of zooming are available in all iTools: Canvas Zoom, which increases or decreases the magnification of the entire display canvas by a specified percentage, and View Zoom, which zooms in or out on a specific portion of the display area.
Canvas Zoom increases or decreases magnification of the entire iTool window without moving the observer's "eye."
To zoom in or out with Canvas Zoom:
View Zoom increases or decreases magnification at a specific point in the iTool window. This is similar to moving the observer's "eye" closer to or farther away from the object. The two ways to view zoom are using the view zoom button or by using the view zoom pull-down menu.
To use the view zoom button:
The view zoom combobox is located just to the right of the view zoom manipulator button on the toolbar and always reports the zoom factor of the currently selected view. You can also use this combobox to set a requested zoom factor for the currently selected view by simply using the pull-down menu to select a value.