Create Sequence Diagrams Programmatically - MATLAB & Simulink (original) (raw)

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Create a sequence diagram programmatically to describe the scenario of a pedestrian crossing the street at an intersection with traffic lights.

To learn more about sequence diagrams, see Author Sequence Diagrams Interactively.

Open Traffic Light Example

Load the TLExample architecture model.

model = systemcomposer.openModel('TLExample');

TLExample architecture model with various components.

Create a new sequence diagram named 'InhibitCopy'.

diagram = model.addInteraction('InhibitCopy');

Add Lifelines

Add a lifeline for each component in the architecture.

sourceLifeline = diagram.addLifeline('TLExample/source'); pollerLifeline = diagram.addLifeline('TLExample/poller'); switchLifeline = diagram.addLifeline('TLExample/switch'); lampLifeline = diagram.addLifeline('TLExample/lampController'); controllerLifeline = diagram.addLifeline('TLExample/controller');

Get the root fragment and root operand of the interaction.

rootFragment = diagram.RootFragment; rootOperand = rootFragment.Operands(1);

Add Messages and Fragments

Add two messages to the root operand.

sourceToPollerMsg = rootOperand.addMessage(sourceLifeline, "switchout", pollerLifeline, "sw", "rising(sw-1){sw==1}"); pollerToSwitchMsg = rootOperand.addMessage(pollerLifeline, "switchEvent", switchLifeline, "switchEvent", "switchEvent{switchEvent==1}");

Add an alternative fragment to the root operand.

altFrag = rootOperand.addFragment('Alt');

Specify the guard expressions for each operand of the alternative fragment.

op1 = altFrag.Operands(1); op1.Guard = "switch/inhibit==0"; op2 = altFrag.addOperand("switch/inhibit==1");

Add two messages to the first operand of the alternative fragment.

switchToLampControllerMsg1 = op1.addMessage(switchLifeline, "lampColor", lampLifeline, "switchPed", "switchPed{switchPed==1}"); switchToControllerMsg = op1.addMessage(switchLifeline, "switchPush", controllerLifeline, "pedRequest", "pedRequest");

Add a message to the second operand of the alternative fragment.

switchToLampControllerMsg2 = op2.addMessage(switchLifeline, "lampColor", lampLifeline, "switchPed", "switchPed{switchPed==2}");

Add Duration Constraints

Add a duration constraint between the two messages in the first operand of the alternative fragment.

startEvent = switchToLampControllerMsg1.End; endEvent = switchToControllerMsg.End; expression = "t > 12msec"; durationConstraint = diagram.addDurationConstraint(startEvent, endEvent, expression);

Open Sequence Diagram

Open the newly created sequence diagram.

Newly created sequence diagram called 'InhibitCopy'.

See Also

systemcomposer.interaction.Interaction | systemcomposer.interaction.Lifeline

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