A ``scale factor'' is used to display a DVI page at a particular size.
It defines the number of paper pixels in each Macintosh screen pixel
(both horizontally and vertically) and always has an integer value
greater than or equal to 1.
Certain View menu items change the current scale factor:
- ``Full View'' sets the scale factor to its maximum value and displays
the entire page and paper edges in the middle of the view window.
- ``Actual Size'' sets the scale factor so that the new view will show the
page at roughly the right size
(it's only approximate because the scale factor is an integer value).
- ``Zoom In'' halves the current scale factor.
- ``Zoom Out'' doubles the current scale factor.
You can also change the scale factor by clicking in the view window
in a variety of ways:
- Click-and-drag within the viewing area to zoom in to the selected rectangle.
If you want to cancel the operation then make the rectangle very thin
(not small, because that might be interpreted as a simple click).
- A simple click will zoom in by halving the scale factor.
- Command-click will zoom in by decrementing the scale factor.
- Option-click will zoom out by incrementing the scale factor.
- Shift-click will zoom out by doubling the scale factor.
- Option-Command-click will temporarily magnify a small area under the cursor
until the mouse button is released. The scale factor in the magnified area is 1.
- A beep occurs if you can't zoom in or out any further.
When you zoom in or out by clicking, will try to make the
point you clicked the middle of the new view.
However, when you choose a menu item, tries to keep the top left
page location fixed.
In both cases it is possible that the view may unexpectedly shift so that it
remains within the scrolling limits set by .
Experiment with the various ways of zooming to see which methods you prefer.
The most precise display occurs when the scale factor is 1
because each screen pixel corresponds to exactly one paper pixel.
doesn't allow you to zoom in any further than this.