Demonstrates a RigidBody connected to various 'roller coaster' paths by a PathJoint.

  • Adds PathEndPoints to Circle and Hump paths, as a demonstation of PathEndPoint.

  • Demonstrates disconnecting the block from path when the block reaches a certain point on the Hump path.

  • Adds variables for distance and velocity as measured along the path, these are called 'path position' and 'path velocity' in English.

Hierarchy (view full)




resetObserver: null | GenericObserver = null

Because one of the scenarios removes the pathJoint, this Observer will add back the PathJoint when a RESET event occurs.


  • Adds the given Observer to this Subject's list of Observers, so that the Observer will be notified of changes in this Subject. An Observer may call Subject.addObserver during its observe method.


    Returns void

  • Notifies all Observers that the Parameter with the given name has changed by calling observe on each Observer.


    • name: string

      the language-independent or English name of the Parameter that has changed

    Returns void


    if there is no Parameter with the given name

  • Define short-cut name replacement rules. For example 'sim' is replaced by 'myApp.sim' when myName is 'myApp'.


    • myName: string

      the name of this object, valid in global Javascript context.

    Returns void

  • Parameters

    • script: string
    • output: boolean = true

      whether to print the result to the output text area and add the script to session history; default is true

    Returns any

    the result of evaluating the string

  • Removes the Observer from this Subject's list of Observers. An Observer may call removeObserver during its observe method.


    • observer: Observer

      the Observer to detach from list of Observers

    Returns void

  • Sets whether this Subject will broadcast events, typically used to temporarily disable broadcasting. Intended to be used in situations where a subclass overrides a method that broadcasts an event. This allows the subclass to prevent the superclass broadcasting that event, so that the subclass can broadcast the event when the method is completed.


    • value: boolean

      whether this Subject should broadcast events

    Returns boolean

    the previous value

  • Returns a minimal string representation of this object, usually giving just identity information like the class name and name of the object.

    For an object whose main purpose is to represent another Printable object, it is recommended to include the result of calling toStringShort on that other object. For example, calling toStringShort() on a DisplayShape might return something like this:


    Returns string

    a minimal string representation of this object.

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