Poseidon for UML: User Guide
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# 6.4. Overview Pane

Especially when working with large models, the Overview pane is quite helpful for keeping track of the big picture of the model.

## 6.4.1. Birdview Tab

Screen space is limited, and it is often impractical to view an entire diagram at one time. Scrolling around or zooming in and out repeatedly is time-consuming, inefficient, and generally annoying. The Birdview tab resolves these issues by maintaining a snapshot of the entire diagram that can be quickly referenced while working on a diagram.

### 6.4.1.1. Redisplay a Section of a Diagram

The portion of the diagram visible in the Diagram pane is highlighted in the Birdview tab. You can change the display by dragging the highlighted portion within the birdview.

### 6.4.1.2. Zoom in Birdview Only

Perhaps you would like to keep track of a smaller section of the diagram, and then later decide to view the entire diagram again. This is easily done by adjusting the zoom factor in the Birdview tab.

To change the zoom factor of the Birdview tab:

1. Uncheck the box in the lower left corner of the pane.

2. Use the slider bar to change the zoom factor.

3. The scroll bars can be used to position the view as required.

### 6.4.1.3. Zoom in a Diagram

The Birdview tab provides the means to resize the diagram in the Diagram pane as well. The view in the Birdview tab remains unchanged while the diagram itself is enlarged or reduced.

To change the zoom factor of the diagram in the Diagram pane:

1. Check the box in the lower left corner of the pane.

2. Use the slider bar to change the zoom factor.

Note that the zoom factor is set for each diagram individually. A zoom factor set for one diagram will not be applied to subsequently displayed diagrams.

### 6.4.1.4. Turn Off Birdview in Settings

The Birdview, while helpful, can slow down the performance of Poseidon. At times, it may be useful to turn off the Birdview option. This can be set in the Appearance Tab of the Settings dialog.

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