RhinoCommon API

## ArcCurve Class |

Represent arcs and circles.

ArcCurve.IsCircle returns true if the curve is a complete circle.

Inheritance Hierarchy

SystemObject

Rhino.RuntimeCommonObject

Rhino.GeometryGeometryBase

Rhino.GeometryCurve

Rhino.GeometryArcCurve

Rhino.RuntimeCommonObject

Rhino.GeometryGeometryBase

Rhino.GeometryCurve

Rhino.GeometryArcCurve

Syntax

The ArcCurve type exposes the following members.

Constructors

Name | Description | |
---|---|---|

ArcCurve |
Initializes a new ArcCurve instance.
Radius is set to 1, position to Origin and Domain to full span (circle). | |

ArcCurve(Arc) |
Initializes a new ArcCurve instance,
copying values from another Arc.
| |

ArcCurve(ArcCurve) |
Initializes a new ArcCurve instance,
copying values from another ArcCurve.
| |

ArcCurve(Circle) |
Initializes a new ArcCurve instance,
copying the shape of a Circle.
Parameterization will be [0;circle.Circumference] | |

ArcCurve(SerializationInfo, StreamingContext) |
Protected constructor used in serialization.
| |

ArcCurve(Arc, Double, Double) |
Initializes a new ArcCurve instance,
copying values from another Arc and specifying the
needed parametrization of the arc.
Arc will not be cut again at these parameterizations. | |

ArcCurve(Circle, Double, Double) |
Initializes a new ArcCurve instance,
copying values from a Circle and specifying the
needed parametrization of the arc.
Circle will not be newly cut at these parameterizations. |

Properties

Name | Description | |
---|---|---|

AngleDegrees |
Gets the angles of this arc in degrees.
| |

AngleRadians |
Gets the angles of this arc in radians.
| |

Arc |
Gets the arc that is contained within this ArcCurve.
| |

Degree |
Gets the maximum algebraic degree of any span
or a good estimate if curve spans are not algebraic.
(Inherited from Curve.) | |

Dimension |
Gets the dimension of the object.
(Inherited from Curve.)The dimension is typically three. For parameter space trimming curves the dimension is two. In rare cases the dimension can be one or greater than three. | |

Disposed |
Indicates if this object has been disposed or the
document it originally belonged to has been disposed.
(Inherited from CommonObject.) | |

Domain |
Gets or sets the domain of the curve.
(Inherited from Curve.) | |

HasBrepForm |
Returns true if the Brep.TryConvertBrep function will be successful for this object
(Inherited from GeometryBase.) | |

HasUserData |
Gets true if this class has any custom information attached to it through UserData.
(Inherited from CommonObject.) | |

IsClosed |
Gets a value indicating whether or not this curve is a closed curve.
(Inherited from Curve.) | |

IsCompleteCircle |
Gets a value indicating whether or not this curve can be represented by a complete circle.
| |

IsDeformable |
true if object can be accurately modified with "squishy" transformations like
projections, shears, and non-uniform scaling.
(Inherited from GeometryBase.) | |

IsDocumentControlled |
If true this object may not be modified. Any properties or functions that attempt
to modify this object when it is set to "IsReadOnly" will throw a NotSupportedException.
(Inherited from GeometryBase.) | |

IsPeriodic |
Gets a value indicating whether or not this curve is considered to be Periodic.
(Inherited from Curve.) | |

IsSubDFriendly |
Returns true if the curve is a cubic, non-rational, uniform NURBS curve that is either periodic or has natural end conditions.
Othewise, false is returned.
(Inherited from Curve.) | |

IsValid | Tests an object to see if it is valid. (Inherited from CommonObject.) | |

ObjectType |
Useful for switch statements that need to differentiate between
basic object types like points, curves, surfaces, and so on.
(Inherited from GeometryBase.) | |

PointAtEnd |
Evaluates point at the end of the curve.
(Inherited from Curve.) | |

PointAtStart |
Evaluates point at the start of the curve.
(Inherited from Curve.) | |

Radius |
Gets the radius of this ArcCurve.
| |

SpanCount |
Gets the number of non-empty smooth (c-infinity) spans in the curve.
(Inherited from Curve.) | |

TangentAtEnd | Evaluate unit tangent vector at the end of the curve. (Inherited from Curve.) | |

TangentAtStart | Evaluates the unit tangent vector at the start of the curve. (Inherited from Curve.) | |

UserData |
List of custom information that is attached to this class.
(Inherited from CommonObject.) | |

UserDictionary |
Dictionary of custom information attached to this class. The dictionary is actually user
data provided as an easy to use sharable set of information.
(Inherited from CommonObject.) | |

UserStringCount |
Gets the amount of user strings.
(Inherited from GeometryBase.) |

Methods

Name | Description | |
---|---|---|

ChangeClosedCurveSeam |
If this curve is closed, then modify it so that the start/end point is at curve parameter t.
(Inherited from Curve.) | |

ChangeDimension |
Changes the dimension of a curve.
(Inherited from Curve.) | |

ClosedCurveOrientation |
Determines the orientation (counterclockwise or clockwise) of a closed, planar curve in the world XY plane.
Only works with simple (no self intersections) closed, planar curves.
(Inherited from Curve.) | |

ClosedCurveOrientation(Plane) |
Determines the orientation (counterclockwise or clockwise) of a closed, planar curve in a given plane.
Only works with simple (no self intersections) closed, planar curves.
(Inherited from Curve.) | |

ClosedCurveOrientation(Transform) |
Determines the orientation (counterclockwise or clockwise) of a closed, planar curve.
Only works with simple (no self intersections) closed, planar curves.
(Inherited from Curve.) | |

ClosedCurveOrientation(Vector3d) |
Determines the orientation (counterclockwise or clockwise) of a closed, planar curve in a given plane.
Only works with simple (no self intersections) closed, planar curves.
(Inherited from Curve.) | |

ClosestPoint(Point3d, Double) |
Finds parameter of the point on a curve that is closest to testPoint.
If the maximumDistance parameter is > 0, then only points whose distance
to the given point is <= maximumDistance will be returned. Using a
positive value of maximumDistance can substantially speed up the search.
(Inherited from Curve.) | |

ClosestPoint(Point3d, Double, Double) |
Finds the parameter of the point on a curve that is closest to testPoint.
If the maximumDistance parameter is > 0, then only points whose distance
to the given point is <= maximumDistance will be returned. Using a
positive value of maximumDistance can substantially speed up the search.
(Inherited from Curve.) | |

ClosestPoints(Curve, Point3d, Point3d) |
Gets closest points between this and another curves.
(Inherited from Curve.) | |

ClosestPoints(IEnumerableGeometryBase, Point3d, Point3d, Int32) |
Finds the object (and the closest point in that object) that is closest to
this curve. (Inherited from Curve.)Breps, surfaces, curves and point clouds are examples of objects that can be passed to this function. | |

ClosestPoints(IEnumerableGeometryBase, Point3d, Point3d, Int32, Double) |
Finds the object (and the closest point in that object) that is closest to
this curve. (Inherited from Curve.)Breps, surfaces, curves and point clouds are examples of objects that can be passed to this function. | |

CombineShortSegments |
Looks for segments that are shorter than tolerance that can be combined.
For NURBS of degree greater than 1, spans are combined by removing
knots. Similarly for NURBS segments of polycurves. Otherwise,
RemoveShortSegments() is called. Does not change the domain, but it will
change the relative parameterization.
(Inherited from Curve.) | |

ComponentIndex |
If this piece of geometry is a component in something larger, like a BrepEdge
in a Brep, then this function returns the component index.
(Inherited from GeometryBase.) | |

ConstructConstObject |
Assigns a parent object and a sub-object index to this.
(Inherited from CommonObject.) | |

Contains(Point3d) | Obsolete.
Computes the relationship between a point and a closed curve region.
This curve must be closed or the return value will be Unset.
Both curve and point are projected to the World XY plane.
(Inherited from Curve.) | |

Contains(Point3d, Plane) | Obsolete.
Computes the relationship between a point and a closed curve region.
This curve must be closed or the return value will be Unset.
(Inherited from Curve.) | |

Contains(Point3d, Plane, Double) |
Computes the relationship between a point and a closed curve region.
This curve must be closed or the return value will be Unset.
(Inherited from Curve.) | |

CurvatureAt | Evaluate the curvature vector at a curve parameter. (Inherited from Curve.) | |

DerivativeAt(Double, Int32) |
Evaluate the derivatives at the specified curve parameter.
(Inherited from Curve.) | |

DerivativeAt(Double, Int32, CurveEvaluationSide) |
Evaluate the derivatives at the specified curve parameter.
(Inherited from Curve.) | |

Dispose |
Actively reclaims unmanaged resources that this instance uses.
(Inherited from CommonObject.) | |

Dispose(Boolean) |
For derived class implementers.
(Inherited from Curve.)This method is called with argument true when class user calls Dispose(), while with argument false when the Garbage Collector invokes the finalizer, or Finalize() method. You must reclaim all used unmanaged resources in both cases, and can use this chance to call Dispose on disposable fields if the argument is true. Also, you must call the base virtual method within your overriding method. | |

DivideAsContour |
Divides this curve at fixed steps along a defined contour line.
(Inherited from Curve.) | |

DivideByCount(Int32, Boolean) |
Divide the curve into a number of equal-length segments.
(Inherited from Curve.) | |

DivideByCount(Int32, Boolean, Point3d) |
Divide the curve into a number of equal-length segments.
(Inherited from Curve.) | |

DivideByLength(Double, Boolean) |
Divide the curve into specific length segments.
(Inherited from Curve.) | |

DivideByLength(Double, Boolean, Point3d) |
Divide the curve into specific length segments.
(Inherited from Curve.) | |

DivideByLength(Double, Boolean, Boolean) |
Divide the curve into specific length segments.
(Inherited from Curve.) | |

DivideByLength(Double, Boolean, Boolean, Point3d) |
Divide the curve into specific length segments.
(Inherited from Curve.) | |

DivideEquidistant |
Calculates 3d points on a curve where the linear distance between the points is equal.
(Inherited from Curve.) | |

Duplicate |
Constructs an exact duplicate of this Curve.
(Inherited from Curve.) | |

DuplicateCurve |
Constructs an exact duplicate of this curve.
(Inherited from Curve.) | |

DuplicateSegments |
Duplicates curve segments.
Explodes polylines, polycurves and G1 discontinuous NURBS curves.
Single segment curves, such as lines, arcs, unkinked NURBS curves, are duplicated.
(Inherited from Curve.) | |

DuplicateShallow |
Constructs a light copy of this object. By "light", it is meant that the same
underlying data is used until something is done to attempt to change it. For example,
you could have a shallow copy of a very heavy mesh object and the same underlying
data will be used when doing things like inspecting the number of faces on the mesh.
If you modify the location of one of the mesh vertices, the shallow copy will create
a full duplicate of the underlying mesh data and the shallow copy will become a
deep copy.
(Inherited from GeometryBase.) | |

EnsurePrivateCopy |
If you want to keep a copy of this class around by holding onto it in a variable after a command
completes, call EnsurePrivateCopy to make sure that this class is not tied to the document. You can
call this function as many times as you want.
(Inherited from CommonObject.) | |

Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) | |

Extend(Interval) |
Where possible, analytically extends curve to include the given domain.
This will not work on closed curves. The original curve will be identical to the
restriction of the resulting curve to the original curve domain.
(Inherited from Curve.) | |

Extend(Double, Double) |
Where possible, analytically extends curve to include the given domain.
This will not work on closed curves. The original curve will be identical to the
restriction of the resulting curve to the original curve domain.
(Inherited from Curve.) | |

Extend(CurveEnd, CurveExtensionStyle, Point3d) |
Extends a curve to a point.
(Inherited from Curve.) | |

Extend(CurveEnd, CurveExtensionStyle, IEnumerableGeometryBase) |
Extends a curve until it intersects a collection of objects.
(Inherited from Curve.) | |

Extend(CurveEnd, Double, CurveExtensionStyle) |
Extends a curve by a specific length.
(Inherited from Curve.) | |

ExtendByArc |
Extends a curve by an Arc until it intersects a collection of objects.
(Inherited from Curve.) | |

ExtendByLine |
Extends a curve by a line until it intersects a collection of objects.
(Inherited from Curve.) | |

ExtendOnSurface(CurveEnd, BrepFace) |
Extends a curve on a surface.
(Inherited from Curve.) | |

ExtendOnSurface(CurveEnd, Surface) |
Extends a curve on a surface.
(Inherited from Curve.) | |

ExtremeParameters |
Returns the parameter values of all local extrema.
Parameter values are in increasing order so consecutive extrema
define an interval on which each component of the curve is monotone.
Note, non-periodic curves always return the end points.
(Inherited from Curve.) | |

Fair |
Fairs a curve object. Fair works best on degree 3 (cubic) curves. Attempts to
remove large curvature variations while limiting the geometry changes to be no
more than the specified tolerance.
(Inherited from Curve.) | |

Finalize |
Passively reclaims unmanaged resources when the class user did not explicitly call Dispose().
(Inherited from CommonObject.) | |

Fit |
Fits a new curve through an existing curve.
(Inherited from Curve.) | |

FrameAt | Returns a 3d frame at a parameter. (Inherited from Curve.) | |

GetBoundingBox(Boolean) |
Bounding box solver. Gets the world axis aligned bounding box for the geometry.
(Inherited from GeometryBase.) | |

GetBoundingBox(Plane) |
Aligned Bounding box solver. Gets the plane aligned bounding box.
(Inherited from GeometryBase.) | |

GetBoundingBox(Transform) |
Aligned Bounding box solver. Gets the world axis aligned bounding box for the transformed geometry.
(Inherited from GeometryBase.) | |

GetBoundingBox(Plane, Box) |
Aligned Bounding box solver. Gets the plane aligned bounding box.
(Inherited from GeometryBase.) | |

GetConicSectionType |
Returns the type of conic section based on the curve's shape.
(Inherited from Curve.) | |

GetConicSectionType(Point3d, Point3d, Point3d) |
Returns the type of conic section based on the curve's shape.
(Inherited from Curve.) | |

GetCurveParameterFromNurbsFormParameter |
Convert a NURBS curve parameter to a curve parameter.
(Inherited from Curve.) | |

GetHashCode | Serves as the default hash function. (Inherited from Object.) | |

GetLength |
Gets the length of the curve with a fractional tolerance of 1.0e-8.
(Inherited from Curve.) | |

GetLength(Double) | Get the length of the curve. (Inherited from Curve.) | |

GetLength(Interval) | Get the length of a sub-section of the curve with a fractional tolerance of 1e-8. (Inherited from Curve.) | |

GetLength(Double, Interval) | Get the length of a sub-section of the curve. (Inherited from Curve.) | |

GetLocalPerpPoint(Point3d, Double, Double) |
Search for a location on the curve, near seedParmameter, that is perpendicular to a test point.
(Inherited from Curve.) | |

GetLocalPerpPoint(Point3d, Double, Interval, Double) |
Search for a location on the curve, near seedParmameter, that is perpendicular to a test point.
(Inherited from Curve.) | |

GetLocalTangentPoint(Point3d, Double, Double) |
Search for a location on the curve, near seedParmameter, that is tangent to a test point.
(Inherited from Curve.) | |

GetLocalTangentPoint(Point3d, Double, Interval, Double) |
Search for a location on the curve, near seedParmameter, that is tangent to a test point.
(Inherited from Curve.) | |

GetNextDiscontinuity(Continuity, Double, Double, Double) |
Searches for a derivative, tangent, or curvature discontinuity.
(Inherited from Curve.) | |

GetNextDiscontinuity(Continuity, Double, Double, Double, Double, Double) |
Searches for a derivative, tangent, or curvature discontinuity.
(Inherited from Curve.) | |

GetNurbsFormParameterFromCurveParameter | Convert a curve parameter to a NURBS curve parameter. (Inherited from Curve.) | |

GetObjectData |
Populates a System.Runtime.Serialization.SerializationInfo with the data needed to serialize the target object.
(Inherited from CommonObject.) | |

GetPerpendicularFrames |
Gets a collection of perpendicular frames along the curve. Perpendicular frames
are also known as 'Zero-twisting frames' and they minimize rotation from one frame to the next.
(Inherited from Curve.) | |

GetType | Gets the Type of the current instance. (Inherited from Object.) | |

GetUserString |
Gets user string from this geometry.
(Inherited from GeometryBase.) | |

GetUserStrings |
Gets a copy of all (user key string, user value string) pairs attached to this geometry.
(Inherited from GeometryBase.) | |

HasNurbsForm |
Does a NURBS curve representation of this curve exist?
(Inherited from Curve.) | |

InflectionPoints |
Returns a curve's inflection points. An inflection point is a location on
a curve at which the sign of the curvature (i.e., the concavity) changes.
The curvature at these locations is always 0.
(Inherited from Curve.) | |

IsArc |
Test a curve to see if it can be represented by an arc or circle within RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

IsArc(Double) |
Test a curve to see if it can be represented by an arc or circle within the given tolerance.
(Inherited from Curve.) | |

IsCircle |
Test a curve to see if it can be represented by a circle within RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

IsCircle(Double) |
Test a curve to see if it can be represented by a circle within the given tolerance.
(Inherited from Curve.) | |

IsClosable(Double) |
Decide if it makes sense to close off this curve by moving the endpoint
to the start based on start-end gap size and length of curve as
approximated by chord defined by 6 points.
(Inherited from Curve.) | |

IsClosable(Double, Double, Double) |
Decide if it makes sense to close off this curve by moving the endpoint
to the start based on start-end gap size and length of curve as
approximated by chord defined by 6 points.
(Inherited from Curve.) | |

IsContinuous |
Test continuity at a curve parameter value.
(Inherited from Curve.) | |

IsEllipse |
Test a curve to see if it can be represented by an ellipse within RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

IsEllipse(Double) |
Test a curve to see if it can be represented by an ellipse within a given tolerance.
(Inherited from Curve.) | |

IsInPlane(Plane) | Test a curve to see if it lies in a specific plane. (Inherited from Curve.) | |

IsInPlane(Plane, Double) | Test a curve to see if it lies in a specific plane. (Inherited from Curve.) | |

IsLinear |
Test a curve to see if it is linear to within RhinoMath.ZeroTolerance units (1e-12).
(Inherited from Curve.) | |

IsLinear(Double) |
Test a curve to see if it is linear to within the custom tolerance.
(Inherited from Curve.) | |

IsPlanar | Test a curve for planarity. (Inherited from Curve.) | |

IsPlanar(Double) | Test a curve for planarity. (Inherited from Curve.) | |

IsPolyline |
Several types of Curve can have the form of a polyline
including a degree 1 NurbsCurve, a PolylineCurve,
and a PolyCurve all of whose segments are some form of
polyline. IsPolyline tests a curve to see if it can be
represented as a polyline.
(Inherited from Curve.) | |

IsShort(Double) | Used to quickly find short curves. (Inherited from Curve.) | |

IsShort(Double, Interval) | Used to quickly find short curves. (Inherited from Curve.) | |

IsValidWithLog |
Determines if an object is valid. Also provides a report on errors if this
object happens not to be valid.
(Inherited from CommonObject.) | |

LengthParameter(Double, Double) |
Gets the parameter along the curve which coincides with a given length along the curve.
A fractional tolerance of 1e-8 is used in this version of the function.
(Inherited from Curve.) | |

LengthParameter(Double, Double, Interval) |
Gets the parameter along the curve which coincides with a given length along the curve.
A fractional tolerance of 1e-8 is used in this version of the function.
(Inherited from Curve.) | |

LengthParameter(Double, Double, Double) |
Gets the parameter along the curve which coincides with a given length along the curve.
(Inherited from Curve.) | |

LengthParameter(Double, Double, Double, Interval) |
Gets the parameter along the curve which coincides with a given length along the curve.
(Inherited from Curve.) | |

LocalClosestPoint |
Find parameter of the point on a curve that is locally closest to
the testPoint. The search for a local close point starts at
a seed parameter.
(Inherited from Curve.) | |

MakeClosed |
If IsClosed, just return true. Otherwise, decide if curve can be closed as
follows: Linear curves polylinear curves with 2 segments, NURBS with 3 or less
control points cannot be made closed. Also, if tolerance > 0 and the gap between
start and end is larger than tolerance, curve cannot be made closed.
Adjust the curve's endpoint to match its start point.
(Inherited from Curve.) | |

MakeDeformable |
If possible, converts the object into a form that can be accurately modified
with "squishy" transformations like projections, shears, an non-uniform scaling.
(Inherited from GeometryBase.) | |

MaxCurvaturePoints |
Returns a curve's maximum curvature points. The maximum curvature points identify
where the curvature starts to decrease in both directions from the points.
(Inherited from Curve.) | |

MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) | |

MemoryEstimate |
Computes an estimate of the number of bytes that this object is using in memory.
(Inherited from GeometryBase.) | |

NonConstOperation |
For derived classes implementers.
(Inherited from Curve.)Defines the necessary implementation to free the instance from being constant. | |

NormalizedLengthParameter(Double, Double) |
Input the parameter of the point on the curve that is a prescribed arc length from the start of the curve.
A fractional tolerance of 1e-8 is used in this version of the function.
(Inherited from Curve.) | |

NormalizedLengthParameter(Double, Double, Interval) |
Input the parameter of the point on the curve that is a prescribed arc length from the start of the curve.
A fractional tolerance of 1e-8 is used in this version of the function.
(Inherited from Curve.) | |

NormalizedLengthParameter(Double, Double, Double) |
Input the parameter of the point on the curve that is a prescribed arc length from the start of the curve.
(Inherited from Curve.) | |

NormalizedLengthParameter(Double, Double, Double, Interval) |
Input the parameter of the point on the curve that is a prescribed arc length from the start of the curve.
(Inherited from Curve.) | |

NormalizedLengthParameters(Double, Double) |
Input the parameter of the point on the curve that is a prescribed arc length from the start of the curve.
A fractional tolerance of 1e-8 is used in this version of the function.
(Inherited from Curve.) | |

NormalizedLengthParameters(Double, Double, Interval) | ||

NormalizedLengthParameters(Double, Double, Double) |
Input the parameter of the point on the curve that is a prescribed arc length from the start of the curve.
(Inherited from Curve.) | |

NormalizedLengthParameters(Double, Double, Double, Interval) | ||

Offset(Plane, Double, Double, CurveOffsetCornerStyle) |
Offsets this curve. If you have a nice offset, then there will be one entry in
the array. If the original curve had kinks or the offset curve had self
intersections, you will get multiple segments in the output array.
(Inherited from Curve.) | |

Offset(Point3d, Vector3d, Double, Double, CurveOffsetCornerStyle) |
Offsets this curve. If you have a nice offset, then there will be one entry in
the array. If the original curve had kinks or the offset curve had self
intersections, you will get multiple segments in the output array.
(Inherited from Curve.) | |

Offset(Point3d, Vector3d, Double, Double, Double, Boolean, CurveOffsetCornerStyle, CurveOffsetEndStyle) |
Offsets this curve. If you have a nice offset, then there will be one entry in
the array. If the original curve had kinks or the offset curve had self
intersections, you will get multiple segments in the output array.
(Inherited from Curve.) | |

OffsetNormalToSurface |
Finds a curve by offsetting an existing curve normal to a surface.
The caller is responsible for ensuring that the curve lies on the input surface.
(Inherited from Curve.) | |

OffsetOnSurface(BrepFace, Point2d, Double) |
Offset a curve on a brep face surface. This curve must lie on the surface.
(Inherited from Curve.)This overload allows to specify a surface point at which the offset will pass. | |

OffsetOnSurface(BrepFace, Double, Double) |
Offset this curve on a brep face surface. This curve must lie on the surface.
(Inherited from Curve.) | |

OffsetOnSurface(Surface, Point2d, Double) |
Offset a curve on a surface. This curve must lie on the surface.
(Inherited from Curve.)This overload allows to specify a surface point at which the offset will pass. | |

OffsetOnSurface(Surface, Double, Double) |
Offset a curve on a surface. This curve must lie on the surface.
(Inherited from Curve.) | |

OffsetOnSurface(BrepFace, Double, Double, Double) |
Offset a curve on a brep face surface. This curve must lie on the surface.
(Inherited from Curve.)This overload allows to specify different offsets for different curve parameters. | |

OffsetOnSurface(Surface, Double, Double, Double) |
Offset this curve on a surface. This curve must lie on the surface.
(Inherited from Curve.)This overload allows to specify different offsets for different curve parameters. | |

OnSwitchToNonConst |
Is called when a non-constant operation occurs.
(Inherited from GeometryBase.) | |

PerpendicularFrameAt |
Return a 3d frame at a parameter. This is slightly different than FrameAt in
that the frame is computed in a way so there is minimal rotation from one
frame to the next.
(Inherited from Curve.) | |

PointAt | Evaluates point at a curve parameter. (Inherited from Curve.) | |

PointAtLength |
Gets a point at a certain length along the curve. The length must be
non-negative and less than or equal to the length of the curve.
Lengths will not be wrapped when the curve is closed or periodic.
(Inherited from Curve.) | |

PointAtNormalizedLength |
Gets a point at a certain normalized length along the curve. The length must be
between or including 0.0 and 1.0, where 0.0 equals the start of the curve and
1.0 equals the end of the curve.
(Inherited from Curve.) | |

PullToBrepFace(BrepFace, Double) |
Pulls this curve to a brep face and returns the result of that operation.
(Inherited from Curve.) | |

PullToMesh |
Makes a polyline approximation of the curve and gets the closest point on the mesh for each point on the curve.
Then it "connects the points" so that you have a polyline on the mesh.
(Inherited from Curve.) | |

Rebuild |
Rebuild a curve with a specific point count.
(Inherited from Curve.) | |

RemoveShortSegments |
Looks for segments that are shorter than tolerance that can be removed.
Does not change the domain, but it will change the relative parameterization.
(Inherited from Curve.) | |

Reverse |
Reverses the direction of the curve.
(Inherited from Curve.) | |

RibbonOffset(Double, Double, Point3d, Vector3d, Double) |
Offsets a closed curve in the following way: pProject the curve to a plane with given normal.
Then, loose Offset the projection by distance + blend_radius and trim off self-intersection.
THen, Offset the remaining curve back in the opposite direction by blend_radius, filling gaps with blends.
Finally, use the elevations of the input curve to get the correct elevations of the result.
(Inherited from Curve.) | |

RibbonOffset(Double, Double, Point3d, Vector3d, Double, Curve, Surface) |
Offsets a closed curve in the following way: pProject the curve to a plane with given normal.
Then, loose Offset the projection by distance + blend_radius and trim off self-intersection.
THen, Offset the remaining curve back in the opposite direction by blend_radius, filling gaps with blends.
Finally, use the elevations of the input curve to get the correct elevations of the result.
(Inherited from Curve.) | |

RibbonOffset(Double, Double, Point3d, Vector3d, Double, Double, Double) |
Offsets a closed curve in the following way: pProject the curve to a plane with given normal.
Then, loose Offset the projection by distance + blend_radius and trim off self-intersection.
THen, Offset the remaining curve back in the opposite direction by blend_radius, filling gaps with blends.
Finally, use the elevations of the input curve to get the correct elevations of the result.
(Inherited from Curve.) | |

Rotate |
Rotates the object about the specified axis. A positive rotation
angle results in a counter-clockwise rotation about the axis (right hand rule).
(Inherited from GeometryBase.) | |

Scale |
Scales the object by the specified factor. The scale is centered at the origin.
(Inherited from GeometryBase.) | |

SetEndPoint | Forces the curve to end at a specified point.
Not all curve types support this operation. (Inherited from Curve.) | |

SetStartPoint | Forces the curve to start at a specified point.
Not all curve types support this operation. (Inherited from Curve.) | |

SetUserString |
Attach a user string (key,value combination) to this geometry.
(Inherited from GeometryBase.) | |

Simplify |
Returns a geometrically equivalent PolyCurve.
(Inherited from Curve.)The PolyCurve has the following properties 1. All the PolyCurve segments are LineCurve, PolylineCurve, ArcCurve, or NurbsCurve. 2. The NURBS Curves segments do not have fully multiple interior knots. 3. Rational NURBS curves do not have constant weights. 4. Any segment for which IsLinear() or IsArc() is true is a Line, Polyline segment, or an Arc. 5. Adjacent co-linear or co-circular segments are combined. 6. Segments that meet with G1-continuity have there ends tuned up so that they meet with G1-continuity to within machine precision. | |

SimplifyEnd |
Same as SimplifyCurve, but simplifies only the last two segments at "side" end.
(Inherited from Curve.) | |

Smooth(Double, Boolean, Boolean, Boolean, Boolean, SmoothingCoordinateSystem) |
Smooths a curve by averaging the positions of control points in a specified region.
(Inherited from Curve.) | |

Smooth(Double, Boolean, Boolean, Boolean, Boolean, SmoothingCoordinateSystem, Plane) |
Smooths a curve by averaging the positions of control points in a specified region.
(Inherited from Curve.) | |

SpanDomain |
Get the domain of the curve span with the given index.
Use the SpanCount property to test how many spans there are.
(Inherited from Curve.) | |

Split(IEnumerableDouble) |
Splits (divides) the curve at a series of specified parameters.
The parameter must be in the interior of the curve domain.
(Inherited from Curve.) | |

Split(Double) |
Splits (divides) the curve at the specified parameter.
The parameter must be in the interior of the curve's domain.
(Inherited from Curve.) | |

Split(Brep, Double) | Obsolete.
Splits a curve into pieces using a polysurface.
(Inherited from Curve.) | |

Split(Surface, Double) | Obsolete.
Splits a curve into pieces using a surface.
(Inherited from Curve.) | |

Split(Brep, Double, Double) |
Splits a curve into pieces using a polysurface.
(Inherited from Curve.) | |

Split(Surface, Double, Double) |
Splits a curve into pieces using a surface.
(Inherited from Curve.) | |

TangentAt | Evaluates the unit tangent vector at a curve parameter. (Inherited from Curve.) | |

ToArcsAndLines |
Converts a curve into polycurve consisting of arc segments. Sections of the input curves that are nearly straight are converted to straight-line segments.
(Inherited from Curve.) | |

ToJSON |
Create a JSON string representation of this object
(Inherited from CommonObject.) | |

ToNurbsCurve |
Constructs a NURBS curve representation of this curve.
(Inherited from Curve.) | |

ToNurbsCurve(Interval) |
Constructs a NURBS curve representation of this curve.
(Inherited from Curve.) | |

ToPolyline(Double, Double, Double, Double) |
Gets a polyline approximation of a curve.
(Inherited from Curve.) | |

ToPolyline(Int32, Int32, Double, Double, Double, Double, Double, Double, Boolean) |
Gets a polyline approximation of a curve.
(Inherited from Curve.) | |

ToPolyline(Int32, Int32, Double, Double, Double, Double, Double, Double, Boolean, Interval) |
Gets a polyline approximation of a curve.
(Inherited from Curve.) | |

TorsionAt |
Evaluate the torsion of a curve at a parmeter. Sometimes also called the "second curvature",
torsion is the rate of change of a curve's osculating plane.
(Inherited from Curve.) | |

ToString | Returns a string that represents the current object. (Inherited from Object.) | |

Transform |
Transforms the geometry. If the input Transform has a SimilarityType of
OrientationReversing, you may want to consider flipping the transformed
geometry after calling this function when it makes sense. For example,
you may want to call Flip() on a Brep after transforming it.
(Inherited from GeometryBase.) | |

Translate(Vector3d) | Translates the object along the specified vector. (Inherited from GeometryBase.) | |

Translate(Double, Double, Double) | Translates the object along the specified vector. (Inherited from GeometryBase.) | |

Trim(Interval) |
Removes portions of the curve outside the specified interval.
(Inherited from Curve.) | |

Trim(Double, Double) |
Removes portions of the curve outside the specified interval.
(Inherited from Curve.) | |

Trim(CurveEnd, Double) |
Shortens a curve by a given length
(Inherited from Curve.) | |

TryGetArc(Arc) |
Try to convert this curve into an Arc using RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

TryGetArc(Arc, Double) |
Try to convert this curve into an Arc using a custom tolerance.
(Inherited from Curve.) | |

TryGetArc(Plane, Arc) |
Try to convert this curve into an Arc using RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

TryGetArc(Plane, Arc, Double) |
Try to convert this curve into an Arc using a custom tolerance.
(Inherited from Curve.) | |

TryGetCircle(Circle) |
Try to convert this curve into a circle using RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

TryGetCircle(Circle, Double) |
Try to convert this curve into a Circle using a custom tolerance.
(Inherited from Curve.) | |

TryGetEllipse(Ellipse) |
Try to convert this curve into an Ellipse within RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

TryGetEllipse(Ellipse, Double) |
Try to convert this curve into an Ellipse using a custom tolerance.
(Inherited from Curve.) | |

TryGetEllipse(Plane, Ellipse) |
Try to convert this curve into an Ellipse within RhinoMath.ZeroTolerance.
(Inherited from Curve.) | |

TryGetEllipse(Plane, Ellipse, Double) |
Try to convert this curve into an Ellipse using a custom tolerance.
(Inherited from Curve.) | |

TryGetPlane(Plane) | Test a curve for planarity and return the plane. (Inherited from Curve.) | |

TryGetPlane(Plane, Double) | Test a curve for planarity and return the plane. (Inherited from Curve.) | |

TryGetPolyline(Polyline) |
Several types of Curve can have the form of a polyline
including a degree 1 NurbsCurve, a PolylineCurve,
and a PolyCurve all of whose segments are some form of
polyline. IsPolyline tests a curve to see if it can be
represented as a polyline.
(Inherited from Curve.) | |

TryGetPolyline(Polyline, Double) |
Several types of Curve can have the form of a polyline
including a degree 1 NurbsCurve, a PolylineCurve,
and a PolyCurve all of whose segments are some form of
polyline. IsPolyline tests a curve to see if it can be
represented as a polyline.
(Inherited from Curve.) |

Remarks

Details:

an ArcCurve is a sub-curve of a circle, with a constant speed parameterization. The parameterization is an affine linear reparameterization of the underlying arc m_arc onto the domain m_t.

A valid ArcCurve has Radius()>0 and 0<AngleRadians()<=2*PI and a strictly increasing Domain.

See Also