You can create a lifeline by double-clicking on a diagram or choosing how you present it from the tool palette.
You can add a base class to Lifeline by directly typing its Class name after the Lifeline name.
Or, you can create by clicking [New] button from Lifeline’s property view.
Or, you can drag a Class to Sequence diagram to create a lifeline with the class as its base class.
By dragging an Actor from the tree to diagram, you can represent lifeline in Actor on the Sequence Diagram.
After creating a Sequence diagram, you may want to adjust the length of Lifelines to clean up the diagram. Right-click on a diagram and select [Adjust Lifeline Length] and choose from these three options.
Make all the lifeline to the shortest possible.
|Align to Minimum|
Make all the lifeline to the same length as the shortest one on the diagram.
|Align to Maximum||
Make all the lifeline to the same length as the longest one on the diagram.
To clean up Sequence diagrams, you can minimize the length of Execution Specifications. Right-click on a diagram and select [Adjust ExecutionSpecification Length].
You can hide the Execution Specification box on the Lifeline.
Currently, this is available in Astah Professional and UML editions only.
1. Click anywhere on a diagram.
2. A property view for the Sequence diagram opens in the left-bottom pane. Tick off the [Execution Specification Visibility].
To create a found message, select [Synchronous Message] or [Asynchronous Message] from the tool palette and click target Lifeline.
To create a Lost message, select [Synchronous Message] or [Asynchronous Message] from the Tool palette and click Lifeline and then anywhere other than Lifeline.
To create a gate, select [Synchronous Message] or [Asynchronous Message] from the Tool palette and click on a diagram frame then Lifeline.
There are two ways to create a reply message.
1. Select [Reply Message] from a tool palette and click a lifeline.
2. Or, turn [Reply Message Mode] on a tool palette and create Messages.
You can create Operand from the CombinedFragment’s Property view or diagram’s pop-up menu.
You can enter texts and numbers from the CombinedFragment’s Property View.