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When I create an object, I want to automaticlly get an object that is symmetrical to the created one about the Y-axis. But I get caught in an endless loop when using js script as below.
How to listen Add event only once. Please help, thanks.
function ggbOnInit() {
ggbApplet.registerAddListener("AutoSym")
}
function AutoSym(obj) {
ggbApplet.evalCommand("Reflect("+obj+", yAxis)")
}
The same question 
Problem 1
All (?) processes in GGB run asynchronous/parallel. That means: if a new object is created in an AddListener function, this happens immediately and parallel to the actual running AddListener function with an additional concurrent AddListener function (instance)
Solution: unregister the add listener before creating the new object.
.
Problem 2
If only one object is created, then the AddListener can be registered again immediately after the creation of the (mirrored) new object. But if more objects are created (e.g. sides of a polygon) then the re-activation of the listener must be delayed. To my knowledge there is no synchronization command for this. As a workaround I would create a timeout.
.
Problem 3
Not all objects can be mirrored. The corresponding object types are not allowed to be handled in the AddListener function.
Problem 1
All (?) processes in GGB run asynchronous/parallel. That means: if a new object is created in an AddListener function, this happens immediately and parallel to the actual running AddListener function with an additional concurrent AddListener function (instance)
Solution: unregister the add listener before creating the new object.
.
Problem 2
If only one object is created, then the AddListener can be registered again immediately after the creation of the (mirrored) new object. But if more objects are created (e.g. sides of a polygon) then the re-activation of the listener must be delayed. To my knowledge there is no synchronization command for this. As a workaround I would create a timeout.
.
Problem 3
Not all objects can be mirrored. The corresponding object types are not allowed to be handled in the AddListener function.
Problem 4
Double, or more the one, addlistners makes no sense in my eyes?
Problem 5
all new created objects become reflected, is this really intended?
perhaps selection by ggbApplet.getObjectType(o)
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