How to edit the length of the transition (for a widening) ?

[joantopo]

Hi.

In the OffsetAlignmentInfo class, we can add widenings. (automatic or user).

A widening is composite by 1 Region and 2 Transitions (input and output).

However, when we create a widening, we can´t specify the length of each transition.

We can´t edit the length of the transition if we get the transition object:

AlignmentTransition members:

Methods

	Name	Description
	Slim	This method sets the TransitionType to TransitionType.Linear and sets the length of the transition to 0.

Properties

	Name	Description
	NextRegion	Returns the AlignmentRegion object where the transition ends.
	PreviousRegion	Returns the AlignmentRegion object from which the transition starts.
	TransitionDescription	Returns a data structure containing parametrical information to describe the transition depending on the TransitionType.
	TransitionType	Sets or gets the type of the transition.

AlignmentRegion members:

Methods

	Name	Description
	Split	Split an AlignmentRegion in half creating a widening region with the second AlignmentRegion.

Properties

	Name	Description
	EndStation	Gets or sets the end station of the region.
	EntryTransition	Gets the AlignmentTransition object located at the beginning of the AlignmentRegion.
	ExitTransition	Gets the AlignmentTransition object located at the end of the AlignmentRegion.
	IncreasedWidth	Gets or sets increased width from the standard.
	Length	Gets or sets the length of the region.
	Offset	Gets or sets the offset of the region.
	OffsetDist	Obsolete. Gets or sets the distance of offset.
	RegionType	Gets or sets the type of the region.
	StartStation	Gets or sets the start station of the region.
	WideningCriteria	Gets the widening criteria on the current AlignmentRegion.

So, Can´t I edit the length for the transitions?

Thanks in advance.

[joantopo]

I have read this property:

AutoWideningInfo.TransitionLength

But it´s for automatic widening.

Can I create automatic widening without selecting an XML file? I don´t think we can.

[joantopo]

It seems that there are 5 methods to add widenings:

	AddAutoWidenings(AutoWideningCriteriaInfo, AlignmentSubEntityArc[])	Adds automatic widenings using criteria on the specified specified curve groups of parent Alignment.
	AddAutoWidenings(AutoWideningCriteriaInfo, SweptCurveLocation)	Adds automatic widenings using criteria on the specified specified location of Offset Alignment.
	AddAutoWidenings(AutoWideningInfo, AlignmentSubEntityArc[])	Adds automatic widenings using manual windening properties on the specified curve groups of the parent Alignment.
	AddAutoWidenings(AutoWideningInfo, SweptCurveLocation)	Adds automatic widenings using manual windening properties on the specified location of the Offset Alignment.
	AddWidening	Adds a widening with two 0-length linear transitions to the Offset Alignment.

The first two need a XML file.

The last (AddWidening), the length of each transition(input and output) is 0, and I can´t modify this later.

I can use the third or the fourth type,  (automatic widenings using manual windering properties).

In this case, I can put the length for the transition, but the length is the same for the input and output transition. Then, I can change the transition´s type ( from automatic to user).

[joantopo · Accepted solution]

Ok, I think I have found it:

OffsetAlignmentInfo.Transitions---------------------> (get our Transition in the Transitions collection)---------------->AlignmentTransition.TransitionDescription

TransitionDescriptionBase Members

TransitionDescriptionBase Class Properties See Also Send Feedback

The TransitionDescriptionBase type exposes the following members.

Properties

	Name	Description
	EndStation	Sets or gets the end station for the transition.
	Length	Sets or gets the length for the transition.
	StartStation	Sets or gets the start station for the transition.

We can edit the length of the selected transition.

[Anonymous]

Hola Joantopo, 

Quería consultarte respecto a la modificación de las longitudes de transición en un widening. Con la clase TransitionDescriptionBase se puede modificar la longitud, abscisa de inicio y fin tanto de la transición de entrada como de salida, pero como puedo cambiar el tipo de transición, es decir si es lineal, linea-curva-linea, etc., y como cambiar los parámetros dependiendo de esta, taper, radios, etc. Revisando la API he encontrado las siguientes clases:

LinearTransitionDescription

CurveLineCurveTransitionDescription

CurveReverseCurveTransitionDescription

CurveCurveReverseCurveTransitionDescription

Pero no he logrado conseguir modificar los parámetros dependiendo del tipo de transición.

Te agradezco si me puedes ayudar.

Saludos cordiales.

Mauro Vega

AutoCAD Civil 3D 2018.2

Intel Core i7-6700HQ CPU 2.6 GHZ

32 GB RAM 2133 MHz

NVIDIA Quadro M3000M

Windows 10 Pro 64 Bits

[joantopo]

Supongo que tendrás que poner:

AlignmentTransition.TransitionType.  (después del punto, poner la que quieres.. En Visual Studio, ya te ofrecerá las que hay)

En AlignmentTransition, obviamente debe ser el nombre de la instancia que le has puesto.

Mira lo que pone:

Remarks

The transition's TransitionType will be changed to TransitionType.Linear automatically when it fails to autofit with the input type according to the transition's length and other constraints.

Los constraints (radios, etc..) no sé si se pueden cambiar, no siempre está todo disponible desde la API.

[Anonymous]

Hola Joantopo,

Muchas gracias por la información. 

Creo que para los constraints se emplean los miembros de las clases 

LinearTransitionDescription

http://docs.autodesk.com/CIV3D/2018/ENU/API_Reference_Guide/html/dc373630-6327-7ab1-92d3-be9104b326a...

CurveLineCurveTransitionDescription

http://docs.autodesk.com/CIV3D/2018/ENU/API_Reference_Guide/html/da7d7983-8ff7-12b3-fafd-6dfa9185603...

CurveReverseCurveTransitionDescription

http://docs.autodesk.com/CIV3D/2018/ENU/API_Reference_Guide/html/26fd642d-e289-4216-1ca6-611054beebf...

CurveCurveReverseCurveTransitionDescription

http://docs.autodesk.com/CIV3D/2018/ENU/API_Reference_Guide/html/c325022a-ce7c-1e23-090c-4877f9e1c7c...

Pero no he logrado implementarlo dentro de Visual Studio.

Te agradezco si me puedes ayudar.

Saludos cordiales.

Mauro Vega

[Anonymous]

Para definir el tipo de transición y los parámetros (constraints) de la misma, primero es necesario necesario identificar a que región se va a agregar el sobreancho (widening),  recorriendo la colección AlignmentRegionCollection. Una vez identificada la región se define la transición de entrada y de salida según sea el interés mediante el metodo AlignmentRegion.EntryTransition o ExitTransition. Posteriormente, se define el tipo de transición mediante AlignmentTransition.TrasitionType = TransitionType.Linear o TransitionType.CurveLineCurve, etc, y finalmente empleando el método TransitionDescription se definen los parámetros. A continuación un ejemplo.

Dim rc As AlignmentRegionCollection
Dim ra As AlignmentRegion
Dim tent As AlignmentTransition
Dim tsal As AlignmentTransition
Dim lita As LinearTransitionDescription
Dim lclt As LinearTransitionDescription
Dim stain As Double
Dim staen As Double
Dim station As Double

rc = alignment.OffsetAlignmentInfo.Regions
stain = 100
staen = 200
station = (stain + staen) / 2

For Each ra In rc
                    If station > ra.StartStation And station < ra.EndStation Then
                        MsgBox("Inicio:" + ra.StartStation.ToString + "- Fin:" + ra.EndStation.ToString)
                        tent = ra.EntryTransition
                        tsal = ra.ExitTransition
                        tent.TransitionType = Autodesk.Civil.TransitionType.Linear
                        tsal.TransitionType = Autodesk.Civil.TransitionType.Linear
                        lita = tent.TransitionDescription
                        lita.StartStation = stain
                        lita.Length = 5
                        lita.StartStation = stain
                        lclt = tsal.TransitionDescription
                        lclt.EndStation = staen + 5
                        lclt.Length = 5
                        Exit For
                    End If
Next

Saludos!