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  • UML state diagrams with draw.io

    https://about.draw.io/uml-state-diagrams-with-draw-io/

    State diagrams have been used in programming to describe the various possible states that a system can be in for decades. They also quickly show which states lead to each other, and what triggers a change of state.

    Of course, you can use these diagrams for anything system or process that has various states – library books, a publishing process, even punishment and reward states for your kids. They are very similar to flow diagrams, but UML has a notation specifically for state diagrams, which they also call state machines or statecharts.

    Components of  UML state diagram

    UML state diagrams use a notation that you may have already seen in our UML activity diagrams.

    • Start state: A solid circle.
    • End state: A solid circle with a ring around it.
    • State: A rectangle with rounded corners, with the name of the action.
    • Transition: Connector arrows with a label to indicate the trigger for that transition, if there is one.
    • State with internal activities: A state with a horizontal line, and the actions listed in the bottom half.
    • Composite state: A state with a horizontal line, and a nested state diagram (or link to another draw.io page) in the bottom half.
    • Guards or conditions: A diamond.
    • Fork: A thicker line with one transition incoming and two or more outgoing.   一个输入,多个输出
    • Join: A thicker line with more than one transition incoming and only one outgoing.  多个输入,一个输出

    Tip: UML 2 state diagrams use the clear black/white shapes, and UML 1 has yellow shapes with a red outline. I personally find UML 2 easier to read.

     

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  • 原文地址:https://www.cnblogs.com/chucklu/p/12165013.html
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