How can I focus (zoom in) on a sequence region or feature?
In SnapGene 8.1 the Focus on Region button has been reinstated for sequences over 10,000 bp in length. You can still access the "Focus on Region" controls for any length sequence via menu View → Focus on Region, or using keyboard hot keys
For sequences over 10,000 bp in length, the Focus on Region button is located in the top right toolbar
Focus on a Region and See the Focus Controls
View a file greater than 10,000 bp in length and click the Focus on Region button (1). If desired, in Map view first select a sequence region or feature of interest, then click the Focus on Region button. The selection will be centered in the "focused" view.
Alternatively, for any sequence, select a region or feature in Map view, then click menu View → Focus on Region to show a "focused" view, and see the "focus" controls at the bottom of the window.
The rectangle in the right hand overview (2) shows the displayed "focus" location and range within the full sequence.
For quick access to "focused" mode use hotkeys:
- macOS: command-option = or command-option z
- Windows or Linux: CTRL-ALT = or CTRL-ALT z
View or Adjust the "Focus" Region in Sequence View
To view the "focus" region in Sequence view, click the Sequence tab. Bases in the zoom window upstream (and if possible) downstream of the selection are shown.
- To change the number of bases shown on either side of the selection, click the buttons (+ or –). Alternatively, drag the slider.
- To change the width of the "focus" region, edit either the width value or the range bounds.
- Use the "scroll wheel" to move along the sequence.
- Alternatively, to move along the sequence, drag the "focus" window boundary in the overview.
Features, Primers and Enzymes Views when in "Focused" Mode
When in "focused" mode, Features, Primers and Enzymes view will list only those annotations visible within the "focus" region.
