Panning
If a structure is too large to be shown all at once in the Tree Editing Area
you can pan around to see the rest of it. There are a number of ways to do this:
- Use the scroll bars
- Drag the drawing area around with the mouse (hold the left mouse button down to do this)
- Use the mouse wheel (vertical movement only)
- Use the cursor keys
Before using the mouse wheel or the cursor keys to pan, you must assign the focus to the
Tree Editing Area by clicking in it first.
Note that there are two modes of panning with the cursor keys:
- If you click on the background of a structure and then use the cursor keys,
the structure will be panned around in a way similar to using the other panning methods listed above.
- If you first click on a box in the structure to select it and then use the cursor keys,
each click will have the effect of moving the selection to the nearest box in the relevant direction,
and the structure will only be panned when the box to which the selection is moved is off the
edge of the Tree Editing Area.
Zooming
Zooming in and out can be performed using menu items from the Tree Editing
Area right-click pop-up menu, or by using
buttons on the toolbar:
Use this repeatedly
to zoom in
Use this repeatedly
to zoom out
There are also buttons for a number of preset zoom factors:
Sets the zoom
factor so that the boxes are 'large'
Sets the zoom
factor to its default value
Sets the zoom
factor so that the boxes are 'small'
Sets the
zoom factor so that the boxes are 'very small'
And finally there is:
Zooms so that the
whole structure is visible
If you zoom out so far that the box names are too small to be seen clearly, a text box appears in
the bottom-left corner of the Tree Editing Area. The name of the box currently under
the mouse is displayed in this area:
If you zoom out even further, the box names are eventually omitted from the boxes:
