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RebarConstraint Class

Rebar Constraint Class

A class representing a constraint on a handle of a rebar element.
Inheritance Hierarchy
System Object
Autodesk.Revit.DB.Structure RebarConstraint

Namespace: Autodesk.Revit.DB.Structure
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.0.4.0 (26.0.4.0)
Syntax 
public class RebarConstraint : IDisposable

The RebarConstraint type exposes the following members.

Properties
Name Description
Public property IsValidObject Specifies whether the .NET object represents a valid Revit entity.
Public property NumberOfTargets Identifies the number of references associated to the rebar handle.
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Methods
Name Description
Public method ConstrainsRebarEnds Returns true if this constraint constrains two rebar ends.
Public method Static member Create
Public method Static member CreateConstraintToSurface

This method creates a constraint of 'To Surface' type for a given RebarConstrainedHandle.

The RebarConstrainedHandle should belong to a shape driven rebar, otherwise it will throw exception.

Public method Dispose Releases all resources used by the RebarConstraint
Public method Equals Determines whether the specified object is equal to the current object.
(Inherited from Object )
Public method FlipHandleOverTarget Flips the RebarConstrainedHandle to the other side of the target bar handle, maintaining the distance in absolute value.
Public method FlipSideForClearBarSpacingZeroDistanceConstraint Flips the side on which a RebarConstrainedHandle constrained using clear bar distance with zero offset connects to another Rebar target handle.
Public method GetConstraintType Returns the RebarConstraintType of a RebarConstraint.
Public method GetCustomHandleTag Returns the handle tag of the RebarConstrainedHandle. This is valid only for Free Form Rebar.
Public method GetDistanceToTargetCover Returns the distance from the RebarConstrainedHandle to the target Host Cover Element surface. The RebarConstraintType of the RebarConstraint must be 'ToCover'.
Public method GetDistanceToTargetHostFace Returns the distance from the RebarConstrainedHandle to the target Host Element surface. The RebarConstraintType of the RebarConstraint must be 'FixedDistanceToHostFace'.
Public method GetDistanceToTargetRebar Gets the distance from the RebarConstrainedHandle to the target Rebar handle surface. The RebarConstraintType of the RebarConstraint must be 'ToOtherRebar'.
Public method GetHashCode Serves as the default hash function.
(Inherited from Object )
Public method GetPositiveOffsetDirectionForToOtherRebarConstraint Returns the positive offset direction vector.
Public method GetRebarConstrainedHandle Gets the RebarConstrainedHandle for which this constraint is.
Public method GetRebarConstraintTargetHostFaceType Returns the RebarConstraintTargetHostFaceType of the host Element face to which the RebarConstraint is attached. The RebarConstraintType of the RebarConstraint must be 'FixedDistanceToHostFace' or 'ToCover'. Will throw exception if it's a multi target constraint.
Public method GetRebarConstraintTargetHostFaceType(Int32) Returns the RebarConstraintTargetHostFaceType of the host Element face to which the RebarConstraint is attached. The RebarConstraintType of the RebarConstraint must be 'FixedDistanceToHostFace' or 'ToCover'.
Public method GetSurfaceForConstraintToSurface This method retrieves the surface for a constraint of 'To Surface' type.
Public method GetTargetCoverType Returns the RebarCoverType for the face specified by targetIndex. Returns null if no RebarHostData is present for target element.
Public method GetTargetElement Gets the Element object (either Host or Rebar) which provides the constraint. Will throw exception if it's a multi target constraint.
Public method GetTargetElement(Int32) Gets the Element object (either Host or Rebar) which provides the constraint. Will return the Element which contains the face at targetIndex.
Public method GetTargetHostFaceAndTransform Returns the face to which the RebarConstraint is attached associated to the given target index. The RebarConstraintType of the RebarConstraint must be 'FixedDistanceToHostFace' or 'ToCover'.
Public method GetTargetHostFaceReference Returns a reference to the host Element face to which the RebarConstraint is attached. The RebarConstraintType of the RebarConstraint must be 'FixedDistanceToHostFace' or 'ToCover'. Will throw exception if it's a multi target constraint.
Public method GetTargetHostFaceReference(Int32) Returns a reference that corresponds to the face to which the RebarConstraint is attached specified by the targetIndex. The RebarConstraintType of the RebarConstraint must be 'FixedDistanceToHostFace' or 'ToCover'.
Public method GetTargetRebarAngleOnBarOrHookBend Returns the angular increment along a bar or hook bend to which the RebarConstraint is attached.
Public method GetTargetRebarBendNumber Returns the number of the bend on the other Rebar Element to which this RebarConstraint is attached. The RebarConstraint must be of RebarConstraintType 'ToOtherRebar,' and the TargetRebarConstraintType must be 'BarBend'. Rebar must be Shape Driven Rebar element.
Public method GetTargetRebarConstraintType Returns the TargetRebarConstraintType of the handle on the other Rebar Element to which this RebarConstraint is attached. The RebarConstraintType of the RebarConstraint must be 'ToOtherRebar'. Rebar must be Shape Driven Rebar element.
Public method GetTargetRebarEdgeNumber Returns the number of the edge on the other Rebar Element to which this RebarConstraint is attached. The RebarConstraint must be of RebarConstraintType 'ToOtherRebar,' and the TargetRebarConstraintType must be 'Edge'. Rebar must be Shape Driven Rebar element.
Public method GetTargetRebarHandleBehavior Gets the RebarHandleBehavior of the handle of the other Rebar Element to which this RebarConstraint is attached. The RebarConstraintType of the RebarConstraint must be 'ToOtherRebar'.
Public method GetTargetRebarHookBarEnd Returns 0 or 1 to indicate which end hook on the other Rebar Element to which this RebarConstraint is attached. The RebarConstraint must be of RebarConstraintType 'ToOtherRebar,' and the TargetRebarConstraintType must be 'HookBend'. Rebar must be Shape Driven Rebar element.
Public method GetType Gets the Type of the current instance.
(Inherited from Object )
Public method HasAnEdgeNumber Checks if the getTargetRebarEdgeNumber method can be called for the RebarConstraint.
Public method IsBindingHandleWithTarget Gets the relationship between two RebarConstrainedHandles.
Public method IsEqual Checks if the specified RebarConstraint is the same as 'this'. The method can be used to determine which of the RebarConstraint candidates offered by the RebarConstraintsManager is currently active.
Public method IsFixedDistanceToHostFace Checks if the RebarConstraintType of the RebarConstraint is 'FixedDistanceToHostFace'.
Public method IsReferenceValidForConstraint Checks if the reference provided can be used in creating Rebar constraints
Public method IsToCover Checks if the RebarConstraintType of the RebarConstraint is 'ToCover'. Returns true if the RebarConstraintType of the RebarConstraint is 'ToCover', false otherwise.
Public method IsToHostFaceOrCover Returns true if the RebarConstraintType of the RebarConstraint is either 'FixedDistanceToHostFace' or 'ToCover'.
Public method IsToOtherRebar Checks if the RebarConstraintType of the RebarConstraint is 'ToOtherRebar'.
Public method IsToSurface Checks if the RebarConstraintType of the RebarConstraint is 'ToSurface'.
Public method IsUsingClearBarSpacing Returns true if the RebarConstrainedHandle to target offset is the clear bar distance, false if the offset is measured between bar centers.
Public method IsValid Checks that the RebarConstraint still has access to valid Rebar constraint data and that its RebarConstraintsManager is still valid.
Public method Static member IsValidSurfaceToConstraintHandleTo Checks if the surface can be used to create a constraint to it for the input handle.
Public method ReplaceReferenceTargets
Public method SetDistanceToTargetCover Sets the distance from the RebarConstrainedHandle to the target Host Cover Element surface. The RebarConstraintType of the RebarConstraint must be 'ToCover'.
Public method SetDistanceToTargetHostFace Sets the distance from the RebarConstrainedHandle to the target Host Element surface. The RebarConstraintType of the RebarConstraint must be 'FixedDistanceToHostFace'.
Public method SetDistanceToTargetRebar Sets the offset distance between the constrained RebarConstrainedHandle and its target Rebar handle surface.
Public method SetToBindHandleWithTarget Sets the relationship between two RebarConstrainedHandles.
Public method SetToUseClearBarSpacing Sets whether the RebarConstrainedHandle to target offset is the clear bar distance, or is measured between bar centers.
Public method TargetIsBarBend Returns true if the RebarTargetConstraintType of the RebarConstraint is 'BarBend'.
Public method TargetIsHookBend Returns true if the RebarTargetConstraintType of the RebarConstraint is 'HookBend'.
Public method TargetRebarConstraintTypeIsEdge Returns true if the RebarConstraintType of the RebarConstraint is 'ToOtherRebar,' and the RebarConstraint is attached to an edge of the other Rebar Element.
Public method ToString Returns a string that represents the current object.
(Inherited from Object )
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Remarks

For Shape Driven Rebar Constraints:

Each handle on a rebar is defined by a plane, and can be constrained along the direction perpendicular to a surface. Rebar constraints work by locking the handle planes to targets. These targets can be: surfaces of host elements (faces or cover), the handle planes of other Rebar element or any generic surface.

A special case is for of a straight, standard style bar, running perpendicular to the plane of the stirrup bar. This bar can constrain itself to distinct locations along bends in stirrup bars - points located at 0 degrees, 45 degrees, 90 degrees, etc. around each bend. This is done by simultaneously locking both the straight bar's edge handle and its planar position handle to one or both of the stirrup edges adjacent to the bend in the stirrup.

Usually, to form a constraint, the handle plane and the reference plane must be parallel. However, bar end or segment handles can be constrained to planes at angles up to 84 degrees. Arc-shaped rebar is a special case, and can form constraints to concentric host surfaces.

For Free Form Rebar Constraints:

Each handle of the Rebar can be constrained to multiple host faces or to the face cover.

In order to create a Free Form Rebar Constraint you will need:

  1. RebarConstraintsManager which will manage the constraint.
  2. The rebar handle you want to constraint.
  3. A list of target references which must be element faces to which this handle is constrained.
  4. A Boolean value specifying that the constraint is to cover or directly to face. It will be the same value for all target references
  5. A double value that represent the offset distance from the rebar handle to target references.

RebarConstraints for Free Form Rebar should be created using the Create method and then added to the RebarConstraintsManager using the method SetPreferredConstraint.

See Also