Sequence overview |
Sequence overview is the topmost widget of Sequence view and is designed to provide a flexible tools for navigation in large annotated sequence regions.
Th most of the Sequence overview space is used to visualize annotations for the sequence.
The annotations are organized in rows by their names. If two annotations with the same name overlaps extra row is created.
For every row the name and the total number of annotations in the row are shown with a light grey text
at the right part of the widget.
Below the annotation rows there is a ruler to show coordinates in the sequence.
You can create any number of additinal ruler you need by clicking "Ruler->Create new ruler" item from context menu
The new ruler will be shown right above the default one:
Another important feature of Sequence overview is an ability to synchronize and lock visual ranges for different sequences shown in Sequence view.
This feature is available when there are two or more sequences opened in the same Sequence view
In the picture below we have 2 different parts of chromosome-Y shown in 2 separate Sequence overview widgets. The topmost sequence "NT_011903" is focused. You can check the focus by the sequence name and the icon: all sequences that are not in focus have the sequence name and icon disabled.
If we click the "Lock scales" button the second sequence scale will be adjusted to be the same as the focused sequence scale
and is locked. Now if we move a scrollbar or use zoom buttons for any of the sequence visual ranges for the rest sequences
will also be adjusted.
To unlock the scales click the same button again.
You may use "Adjust scales" button to synchronize scales without locking them.
Note: that if you have a selected sequence region or a selected annotation the scales will be synchronized by the start
position of the region or of the annotation. If there are no active selection the regions are synchronized by the
first visible sequence position on the screen.