There is a easiest and fastest way to draw a sequence diagram in the internet which many not aware of.Nothing to install on your machine.You can avail this if you have a internet connection.

No more waste of time in using MS visio or Rational Rose ,dragging the lines,moving the text boxes etc.

All you need is to give is a very simple instruction to get the diagram ready in seconds ;-)

Go to http://www.websequencediagrams.com/

Type in a code like below :

From eMagics

And then click Draw .You will get Sequence diagram like below ready in seconds :)

From eMagics

Moreover it provides the same diagram in various formats you wish.

Rational Rose look:

From eMagics

Learn these simple instructions and save your time ;-)

Instructions and Examples :

Lifeline Activation and Destruction

Use the activate and deactivate keywords to denote object activation. While activated, the participant's lifeline will be highlighted. The activate/deactivate keywords will apply to the previous signal.

You can use the destroy keyword to destroy a participant. The participant's lifeline will end at the previous signal.

User->A: DoWork
activate A
A->B: <>
activate B
B->C: DoWork
activate C
C-->B: WorkDone
destroy C
B-->A: RequestCreated
deactivate B
A->User: Done

From eMagics

Changing the order of participants
If you want to participants to be shown in a different order than they are used, declare them first using the participant keyword. You can also rename them this way to save typing.

participant Bob
participant Alice
participant "I have a really\nlong name" as L

Alice->Bob: Authentication Request
Bob->Alice: Authentication Response
Bob->L: Log transaction

From eMagics

Grouping signals together

You can group signals together using the alt/else, opt, and loop keywords. All of them can take a text description that will be displayed in the group header. Use the end keyword to signal the end of a group. The groups may be nested to any depth.

Alice->Bob: Authentication Request
alt successful case
Bob->Alice: Authentication Accepted
else some kind of failure
Bob->Alice: Authentication Failure
opt
loop 1000 times
Alice->Bob: DNS Attack
end
end
else Another type of failure
Bob->Alice: Please repeat
end

From eMagics

Notes in the diagram

You can add notes to your diagram. Notes can be placed to the left of a participant or to the right of a participant. In addition, you can centre a note over one or more participants.

participant Alice
participant Bob

note left of Alice
This is displayed
left of Alice.
end note
note right of Alice: This is displayed right of Alice.
note over Alice: This is displayed over Alice.
note over Alice, Bob: This is displayed over Bob and Alice.

From eMagics

Source : http://www.websequencediagrams.com/examples.html
Thanks to websequencediagrams.

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