An ON_PolyCurve is an ON_Curve represented by a sequence of contiguous ON_Curve segments. A valid polycurve is represented by an array m_segment of Count()>=1 curve objects and a strictly increasing array m_t of Count()+1 parameter values. The i-th curve segment, when considered as part of the polycurve, is affinely reparamaterized from m_t[i] to m_t[i+1], i.e., m_segment[i].Domain()[0] is mapped to m_t[i] and m_segment[i].Domain()[1] is mapped to m_t[i+1]. More...

#include <opennurbs_polycurve.h>

Inheritance diagram for ON_PolyCurve:

Public Member Functions
	ON_PolyCurve () ON_NOEXCEPT

	ON_PolyCurve (const ON_PolyCurve &)

	ON_PolyCurve (int)

virtual	~ON_PolyCurve ()

bool	Append (ON_Curve *)

bool	AppendAndMatch (ON_Curve *)

bool	ChangeClosedCurveSeam (double t) override
	If this curve is closed, then modify it so that the start/end point is at curve parameter t. More...

bool	ChangeDimension (int desired_dimension) override
	Change the dimension of a curve. More...

bool	CloseGap (int gap_index, int segments_to_modify)
	Modify the one or both locations at the end of segment[gap_index-1] and the start of segment[gap_index] so they are coindicent. More...

int	CloseGaps ()
	Searches for and closes all gaps that can be found. More...

int	Count () const
	Interface. More...

ON__UINT32	DataCRC (ON__UINT32 current_remainder) const override
	virtual ON_Object::DataCRC override More...

int	Degree () const override
	Returns maximum algebraic degree of any span or a good estimate if curve spans are not algebraic. More...

void	Destroy ()

void	DestroyRuntimeCache (bool bDelete=true) override
	virtual ON_Object::DestroyRuntimeCache override More...

int	Dimension () const override
	ON_Geometry overrides. More...

ON_Interval	Domain () const override

void	Dump (ON_TextLog &) const override
	Creates a text dump of the object. More...

ON_Curve *	DuplicateCurve () const override
	ON_Curve overrides. More...

void	EmergencyDestroy ()

bool	Evaluate (double, int, int, double , int=0, int =0) const override
	This evaluator actually does all the work. The other ON_Curve evaluation tools call this virtual function. More...

bool	EvaluatePoint (const class ON_ObjRef &objref, ON_3dPoint &P) const override
	virtual ON_Geometry override More...

bool	Extend (const ON_Interval &domain) override
	Where possible, analytically extends curve to include domain. More...

int	FindNextGap (int segment_index0) const
	Search the curve for gaps between the sub curve segments. More...

ON_Curve *	FirstSegmentCurve () const

bool	GetBBox (double boxmin, double boxmax, bool bGrowBox=false) const override
	virtual ON_Geometry GetBBox override More...

bool	GetCurveParameterFromNurbFormParameter (double, double *) const override
	virtual ON_Curve::GetCurveParameterFromNurbFormParameter override More...

bool	GetNextDiscontinuity (ON::continuity c, double t0, double t1, double t, int hint=nullptr, int *dtype=nullptr, double cos_angle_tolerance=ON_DEFAULT_ANGLE_TOLERANCE_COSINE, double curvature_tolerance=ON_SQRT_EPSILON) const override
	Search for a derivatitive, tangent, or curvature discontinuity. More...

int	GetNurbForm (ON_NurbsCurve &, double=0.0, const ON_Interval *=nullptr) const override
	Get a NURBS curve representation of this curve. More...

bool	GetNurbFormParameterFromCurveParameter (double, double *) const override
	virtual ON_Curve::GetNurbFormParameterFromCurveParameter override More...

bool	GetSpanVector (double *) const override
	Get number of parameters of "knots". More...

bool	GetTightBoundingBox (class ON_BoundingBox &tight_bbox, bool bGrowBox=false, const class ON_Xform *xform=nullptr) const override
	virtual ON_Geometry GetTightBoundingBox override More...

ON_Curve *	HarvestSegment (int)

bool	HasGapAt (int segment_index) const
	Determine if there is a gap between the end of segment[segment_index] and the start of segment[segment_index+1]. More...

int	HasNurbForm () const override
	Does a NURBS curve representation of this curve. More...

bool	HasSynchronizedSegmentDomains () const

bool	Insert (int, ON_Curve *)

bool	IsArc (const ON_Plane =nullptr, ON_Arc =nullptr, double=ON_ZERO_TOLERANCE) const override
	Test a curve to see if the locus if its points is an arc or circle. More...

bool	IsClosed (void) const override
	Test a curve to see if it is closed. More...

bool	IsContinuous (ON::continuity c, double t, int *hint=nullptr, double point_tolerance=ON_ZERO_TOLERANCE, double d1_tolerance=ON_ZERO_TOLERANCE, double d2_tolerance=ON_ZERO_TOLERANCE, double cos_angle_tolerance=ON_DEFAULT_ANGLE_TOLERANCE_COSINE, double curvature_tolerance=ON_SQRT_EPSILON) const override
	Test continuity at a curve parameter value. More...

bool	IsDeformable () const override
	virtual ON_Geometry::IsDeformable() override More...

bool	IsInPlane (const ON_Plane &, double=ON_ZERO_TOLERANCE) const override
	Test a curve to see if it lies in a specific plane. More...

bool	IsLinear (double=ON_ZERO_TOLERANCE) const override
	Test a curve to see if the locus if its points is a line segment. More...

bool	IsNested () const

bool	IsPeriodic (void) const override
	Test a curve to see if it is periodic. More...

bool	IsPlanar (ON_Plane *=nullptr, double=ON_ZERO_TOLERANCE) const override
	Test a curve to see if it is planar. More...

int	IsPolyline (ON_SimpleArray< ON_3dPoint > pline_points=nullptr, ON_SimpleArray< double > pline_t=nullptr) const override
	Several types of ON_Curve can have the form of a polyline including a degree 1 ON_NurbsCurve, an ON_PolylineCurve, and an ON_PolyCurve all of whose segments are some form of polyline. IsPolyline tests a curve to see if it can be represented as a polyline. More...

bool	IsValid (class ON_TextLog *text_log=nullptr) const override
	Tests an object to see if its data members are correctly initialized. More...

bool	IsValid (bool bAllowGaps, ON_TextLog *text_log) const
	Tests an object to see if its data members are correctly initialized. More...

ON_Curve *	LastSegmentCurve () const

bool	MakeDeformable () override
	virtual ON_Geometry::MakeDeformable() override More...

	ON_DEPRECATED_MSG ("Replace calls to HasGap() with FindNextGap(0)") int HasGap() const

	ON_DEPRECATED_MSG ("Use RemoveNesting(). RemoveNestingEx() will be removed in the next release.") bool RemoveNestingEx()

ON_PolyCurve &	operator= (const ON_PolyCurve &)

ON_Curve *	operator[] (int) const
	These operator[] functions return nullptr if index is out of range. More...

bool	ParameterSearch (double t, int &index, bool bEnableSnap) const
	Lookup a parameter in the m_t array, optionally using a built in snap tolerance to snap a parameter value to an element of m_t. More...

double	PolyCurveParameter (int segment_index, double segmentcurve_parameter) const
	Converts a segment curve parameter to a polycurve parameter. More...

bool	Prepend (ON_Curve *)

bool	PrependAndMatch (ON_Curve *)

bool	Read (ON_BinaryArchive &) override
	Low level archive writing tool used by ON_BinaryArchive::ReadObject(). More...

bool	Remove ()

bool	Remove (int)

bool	RemoveNesting ()
	Removes the nested of polycurves. The result will have not have an ON_PolyCurve as a segment but will have identical locus and parameterization. More...

void	Reserve (int)

bool	Reverse () override
	Reverse the direction of the curve. More...

ON_Curve *	SegmentCurve (int segment_index) const
	Returns a pointer to a segment curve. More...

double	SegmentCurveParameter (double polycurve_parameter) const
	Converts a polycurve parameter to a segment curve parameter. More...

const ON_CurveArray &	SegmentCurves () const

ON_Interval	SegmentDomain (int segment_index) const
	Returns the polycurve subdomain assigned to a segment curve. More...

int	SegmentIndex (double polycurve_parameter) const
	Find the segment used for evaluation at polycurve_parameter. More...

int	SegmentIndex (ON_Interval sub_domain, int segment_index0, int segment_index1) const
	Find the segments with support on sub_domain. More...

const ON_SimpleArray< double > &	SegmentParameters () const

bool	SetDomain (double t0, double t1) override
	virtual ON_Curve::SetDomain override. Set the domain of the curve More...

bool	SetEndPoint (ON_3dPoint end_point) override
	Force the curve to end at a specified point. More...

bool	SetParameterization (const double *t)
	Expert user function to set the m_t[] array. More...

void	SetSegment (int index, ON_Curve *crv)

bool	SetStartPoint (ON_3dPoint start_point) override
	Force the curve to start at a specified point. More...

unsigned int	SizeOf () const override
	ON_Object overrides. More...

int	SpanCount () const override
	Get number of nonempty smooth (c-infinity) spans in curve More...

bool	Split (double t, ON_Curve &left_side, ON_Curve &right_side) const override
	virtual ON_Curve::Split override. Divide the curve at the specified parameter. The parameter must be in the interior of the curve's domain. The pointers passed to Split must either be nullptr or point to an ON_Curve object of the same of the same type. If the pointer is nullptr, then a curve will be created in Split(). You may pass "this" as one of the pointers to Split(). More...

bool	SwapCoordinates (int, int) override
	Swaps object coordinate values with indices i and j. More...

bool	SynchronizeSegmentDomains ()
	Sets the domain of the curve int the m_segment[] array to exactly match the domain defined in the m_t[] array. This is not required, but can simplify some coding situations. More...

bool	Transform (const ON_Xform &) override
	overrides virtual ON_Geometry::Transform(). ON_Curve::Transform() calls ON_Geometry::Transform(xform), which calls ON_Object::TransformUserData(xform), and then calls this->DestroyCurveTree(). More...

bool	Trim (const ON_Interval &domain) override
	virtual ON_Curve::Trim override. Removes portions of the curve outside the specified interval. More...

bool	Write (ON_BinaryArchive &) const override
	Low level archive writing tool used by ON_BinaryArchive::WriteObject(). More...

Public Member Functions inherited from ON_Curve
	ON_Curve () ON_NOEXCEPT

	ON_Curve (const ON_Curve &)

virtual	~ON_Curve ()

ON_3dVector	CurvatureAt (double t) const
	Evaluate the curvature vector at a parameter. More...

ON_3dVector	DerivativeAt (double t) const
	Evaluate first derivative at a parameter. More...

void	DestroyCurveTree ()
	Destroys the runtime curve tree used to speed closest point and intersection calcuations. More...

bool	Ev1Der (double t, ON_3dPoint &point, ON_3dVector &first_derivative, int side=0, int *hint=0) const
	Evaluate first derivative at a parameter with error checking. More...

bool	Ev2Der (double t, ON_3dPoint &point, ON_3dVector &first_derivative, ON_3dVector &second_derivative, int side=0, int *hint=0) const
	Evaluate second derivative at a parameter with error checking. More...

bool	EvCurvature (double t, ON_3dPoint &point, ON_3dVector &tangent, ON_3dVector &kappa, int side=0, int *hint=0) const
	Evaluate unit tangent and curvature at a parameter with error checking. More...

bool	EvPoint (double t, ON_3dPoint &point, int side=0, int *hint=0) const
	Evaluate point at a parameter with error checking. More...

bool	EvTangent (double t, ON_3dPoint &point, ON_3dVector &tangent, int side=0, int *hint=0) const
	Evaluate unit tangent at a parameter with error checking. More...

bool	FirstSpanIsLinear (double min_length, double tolerance) const

bool	FirstSpanIsLinear (double min_length, double tolerance, ON_Line *span_line) const

bool	FrameAt (double t, ON_Plane &plane) const
	Return a 3d frame at a parameter. More...

bool	GetDomain (double t0, double t1) const
	curve interface More...

virtual bool	GetParameterTolerance (double t, double tminus, double tplus) const
	Returns maximum algebraic degree of any span or a good estimate if curve spans are not algebraic. More...

virtual bool	GetSpanVectorIndex (double t, int side, int span_vector_index, ON_Interval span_domain) const

bool	IsArcAt (double t, const ON_Plane plane=0, ON_Arc arc=0, double tolerance=ON_ZERO_TOLERANCE, double t0=0, double t1=0) const

bool	IsClosable (double tolerance, double min_abs_size=0.0, double min_rel_size=10.0) const
	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. More...

virtual bool	IsEllipse (const ON_Plane plane=nullptr, ON_Ellipse ellipse=nullptr, double tolerance=ON_ZERO_TOLERANCE) const

bool	LastSpanIsLinear (double min_length, double tolerance) const

bool	LastSpanIsLinear (double min_length, double tolerance, ON_Line *span_line) const

ON_NurbsCurve *	NurbsCurve (ON_NurbsCurve pNurbsCurve=nullptr, double tolerance=0.0, const ON_Interval subdomain=nullptr) const
	Get a NURBS curve representation of this curve. More...

ON::object_type	ObjectType () const override
	overrides virtual ON_Object::ObjectType. More...

ON_Curve &	operator= (const ON_Curve &)

ON_3dPoint	PointAt (double t) const
	Evaluate point at a parameter. More...

ON_3dPoint	PointAtEnd () const
	Evaluate point at the end of the curve. More...

ON_3dPoint	PointAtStart () const
	Evaluate point at the start of the curve. More...

bool	SetDomain (ON_Interval domain)
	Set the domain of the curve. More...

ON_3dVector	TangentAt (double t) const
	Evaluate unit tangent vector at a parameter. More...

Public Member Functions inherited from ON_Geometry
	ON_Geometry ()=default

	ON_Geometry (const ON_Geometry &)=default

	~ON_Geometry ()=default

ON_BoundingBox	BoundingBox () const
	Get object's 3d axis aligned bounding box. More...

virtual class ON_Brep *	BrepForm (class ON_Brep *brep=nullptr) const
	If possible, BrepForm() creates a brep form of the ON_Geometry. More...

virtual void	ClearBoundingBox ()
	Some objects cache bounding box information. If you modify an object, then call ClearBoundingBox() to inform the object that any cached bounding boxes are invalid. More...

virtual ON_COMPONENT_INDEX	ComponentIndex () const
	If this piece of geometry is a component in something larger, like an ON_BrepEdge in an ON_Brep, then this function returns the component index. More...

bool	GetBoundingBox (ON_BoundingBox &bbox, bool bGrowBox=false) const
	Get object's 3d axis aligned bounding box or the union of the input box with the object's bounding box. More...

bool	GetBoundingBox (ON_3dPoint &bbox_min, ON_3dPoint &bbox_max, bool bGrowBox=false) const
	Get corners of object's 3d axis aligned bounding box or the union of the input box with the object's bounding box. More...

virtual bool	HasBrepForm () const
	Query an object to see if it has an ON_Brep form. Result: Returns true if the virtual ON_Geometry::BrepForm can compute an ON_Brep representation of this object. More...

ON_Geometry &	operator= (const ON_Geometry &)=default

bool	Rotate (double sin_angle, double cos_angle, const ON_3dVector &rotation_axis, const ON_3dPoint &rotation_center)
	Rotates the object about the specified axis. A positive rotation angle results in a counter-clockwise rotation about the axis (right hand rule). More...

bool	Rotate (double rotation_angle, const ON_3dVector &rotation_axis, const ON_3dPoint &rotation_center)
	Rotates the object about the specified axis. A positive rotation angle results in a counter-clockwise rotation about the axis (right hand rule). More...

bool	Scale (double scale_factor)
	Scales the object by the specified facotor. The scale is centered at the origin. More...

bool	Translate (const ON_3dVector &translation_vector)
	Translates the object along the specified vector. More...

Public Member Functions inherited from ON_Object
	ON_Object () ON_NOEXCEPT

	ON_Object (const ON_Object &)

virtual	~ON_Object ()

virtual ON_AggregateComponentStatus	AggregateComponentStatus () const
	Call whenever a component status setting is modifed by directly changing it on a component in a way that will result in any saved information about the parent object's aggretate component status becoming invalid. More...

bool	AttachUserData (class ON_UserData *pUserData)
	Attach user data to an object. More...

unsigned int	ClearAllComponentStates () const
	Set all active level component states to ON_ComponentStatus::NoneSet. More...

virtual unsigned int	ClearComponentStates (ON_ComponentStatus states_to_clear) const
	Clear the specified states on every component. More...

virtual unsigned int	ClearComponentStates (ON_COMPONENT_INDEX component_index, ON_ComponentStatus states_to_clear) const
	Clear states on an individual component. More...

unsigned int	CopyUserData (const ON_Object &source_object, ON_UUID source_userdata_item_id, ON_Object::UserDataConflictResolution userdata_conflict_resolution)
	Expert user tool that copies user data items with positive values of ON_UserData.m_userdata_copycount from source_object to "this. More...

void	CopyUserData (const ON_Object &source_object)
	Calls CopyUserData(source_object,ON_Object::UserDataConflictResolution::source_object). More...

virtual bool	DeleteComponents (const ON_COMPONENT_INDEX *ci_list, size_t ci_count)
	Delete the portions of the object identified in ci_list[]. More...

bool	DetachUserData (class ON_UserData *pUserData)
	Remove user data from an object. More...

void	EmergencyDestroy ()
	Sets m_user_data_list = 0. More...

class ON_UserData *	FirstUserData () const
	User data is stored as a linked list of ON_UserData classes. FirstUserData gets the first item in the linked list. This is the most recent item attached using AttachUserData(). Remark: To iterate through all the user data on an object, call FirstUserData() and then use ON_UserData::Next() to traverse the list. More...

virtual unsigned int	GetComponentsWithSetStates (ON_ComponentStatus states_filter, bool bAllEqualStates, ON_SimpleArray< ON_COMPONENT_INDEX > &components) const

class ON_UserData *	GetUserData (const ON_UUID &userdata_uuid) const
	Get a pointer to user data. More...

bool	GetUserString (const wchar_t *key, ON_wString &string_value) const
	Get user string from the object. More...

int	GetUserStringKeys (ON_ClassArray< ON_wString > &user_string_keys) const
	Get a list of all user string keys on the object. More...

int	GetUserStrings (ON_ClassArray< ON_UserString > &user_strings) const
	Get a list of all user strings on the object. More...

bool	IsKindOf (const ON_ClassId *pClassId) const
	Low level tool to test if an object is derived from a specified class. More...

virtual void	MarkAggregateComponentStatusAsNotCurrent () const
	Call whenever a component status setting is modifed by directly changing it on a component in a way that will result in any saved information about the parent object's aggretate component status becoming invalid. More...

virtual void	MemoryRelocate ()
	The MemoryRelocate() function is called when an object's location in memory is changed. For example, if an object resides in a chunk of memory that is grown by calling a realloc that has to allocate a new chunk and copy the contents of the old chunk to the new chunk, then the location of the object's memory changes. In practice this happens when classes derived from ON_Object are stored in dynamic arrays, like the default implementation of ON_ObjectArray<>'s that use realloc to grow the dynamic array. More...

virtual ON_UUID	ModelObjectId () const
	All objects in an opennurbs model have an id ( ON_Layer.m_layer_id, ON_Font.m_font_id, ON_Material.m_material_id, ON_3dmObjectAttributes.m_uuid ). More...

unsigned int	MoveUserData (ON_Object &source_object, ON_UUID source_userdata_item_id, ON_Object::UserDataConflictResolution userdata_conflict_resolution, bool bDeleteAllSourceItems)
	Expert user tool that moves user data items from source_object to "this. More...

void	MoveUserData (ON_Object &source_object)
	Calls MoveUserData(source_object,ON_Object::UserDataConflictResolution::source_object,true). More...

ON_Object &	operator= (const ON_Object &)

void	PurgeUserData ()
	PurgeUserData() removes all user data from object. More...

virtual unsigned int	SetComponentStates (ON_COMPONENT_INDEX component_index, ON_ComponentStatus states_to_set) const
	Set states on an individual component. More...

virtual unsigned int	SetComponentStatus (ON_COMPONENT_INDEX component_index, ON_ComponentStatus status_to_copy) const
	Copy status settings to an individual component. More...

bool	SetUserString (const wchar_t key, const wchar_t string_value)
	Attach a user string to the object. This information will perisist through copy construction, operator=, and file IO. More...

int	SetUserStrings (int count, const ON_UserString *user_strings, bool bReplace)
	Append entries to the user string list More...

void	TransformUserData (const class ON_Xform &xform)
	Objects derived from ON_Geometry must call TransformUserData() in their Transform() member function. More...

virtual bool	UpdateReferencedComponents (const class ON_ComponentManifest &source_manifest, const class ON_ComponentManifest &destination_manifest, const class ON_ManifestMap &manifest_map)
	Uses the destination_manifest to update references to other components. This is typically done when a component's references came from a "source" context and are being updated to the "destination" context. For example, inserting one model into another when index, id, and name conflicts need to be resolved at the time of insertion. More...

int	UserStringCount () const

Additional Inherited Members
Public Types inherited from ON_Object
enum	UserDataConflictResolution : unsigned char { UserDataConflictResolution::destination_object = 0, UserDataConflictResolution::source_object = 1, UserDataConflictResolution::source_copycount_gt = 2, UserDataConflictResolution::source_copycount_ge = 3, UserDataConflictResolution::destination_copycount_gt = 4, UserDataConflictResolution::destination_copycount_ge = 5, UserDataConflictResolution::delete_item = 6 }
	When a userdata item is copied or moved from a source object to a destination object, the ON_Object::UserDataConflictResolution enum values specify how conficts are resolved. Remark: A userdata item "conflict" occurs when both the destination and source object have a user data item with the same value of ON_UserData::m_userdata_uuid. More...

Static Public Attributes inherited from ON_Geometry
static const ON_Geometry	Unset

Protected Member Functions inherited from ON_Curve
bool	ParameterSearch (double t, int &index, bool bEnableSnap, const ON_SimpleArray< double > &m_t, double RelTol=ON_SQRT_EPSILON) const
	Lookup a parameter in the m_t array, optionally using a built in snap tolerance to snap a parameter value to an element of m_t. This function is used by some types derived from ON_Curve to snap parameter values More...

Detailed Description

An ON_PolyCurve is an ON_Curve represented by a sequence of contiguous ON_Curve segments. A valid polycurve is represented by an array m_segment of Count()>=1 curve objects and a strictly increasing array m_t of Count()+1 parameter values. The i-th curve segment, when considered as part of the polycurve, is affinely reparamaterized from m_t[i] to m_t[i+1], i.e., m_segment[i].Domain()[0] is mapped to m_t[i] and m_segment[i].Domain()[1] is mapped to m_t[i+1].

Constructor & Destructor Documentation

◆ ON_PolyCurve() [1/3]

ON_PolyCurve::ON_PolyCurve ( )

◆ ~ON_PolyCurve()

virtual ON_PolyCurve::~ON_PolyCurve ( )

virtual

◆ ON_PolyCurve() [2/3]

ON_PolyCurve::ON_PolyCurve ( const ON_PolyCurve & )

◆ ON_PolyCurve() [3/3]

ON_PolyCurve::ON_PolyCurve ( int )

Member Function Documentation

◆ Append()

bool ON_PolyCurve::Append ( ON_Curve * )

◆ AppendAndMatch()

bool ON_PolyCurve::AppendAndMatch ( ON_Curve * )

◆ ChangeClosedCurveSeam()

bool ON_PolyCurve::ChangeClosedCurveSeam ( double t )

overridevirtual

If this curve is closed, then modify it so that the start/end point is at curve parameter t.

Parameters

t	[in] curve parameter of new start/end point. The returned curves domain will start at t.

Returns: true if successful.

Overrides virtual ON_Curve::ChangeClosedCurveSeam

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeCurve.

◆ ChangeDimension()

bool ON_PolyCurve::ChangeDimension ( int desired_dimension )

overridevirtual

Change the dimension of a curve.

Parameters

desired_dimension [in]

Returns: true if the curve's dimension was already desired_dimension or if the curve's dimension was successfully changed to desired_dimension.

Reimplemented from ON_Curve.

◆ CloseGap()

bool ON_PolyCurve::CloseGap	(	int	gap_index,
		int	segments_to_modify
	)

Modify the one or both locations at the end of segment[gap_index-1] and the start of segment[gap_index] so they are coindicent.

Parameters

gap_index	[in] 1 <= gap_index < Count() If the locations at the end of segment[gap_index-1] and the start of segment[gap_index] are not identical, then an attempt is made to modify the segments so these locations are closer.
ends_to_modify	[in] 0: (suggested) The code will decide what segments to modify. 1: modify the end location of segment[gap_index-1] 2: modify the start location of segment[gap_index]

Returns: True if a modification was performed and HasGap(gap_index-1) returns 0 after the modification. False if no modification was preformed because there was no gap or because one could not be performed.

Note that passing the return value from FindNextGap() will close the gap found by FindNextGap().

◆ CloseGaps()

int ON_PolyCurve::CloseGaps ( )

Searches for and closes all gaps that can be found.

Returns: Number of gaps that were closed.

◆ Count()

int ON_PolyCurve::Count ( ) const

Interface.

◆ DataCRC()

ON__UINT32 ON_PolyCurve::DataCRC ( ON__UINT32 current_remainder ) const

overridevirtual

virtual ON_Object::DataCRC override

Reimplemented from ON_Object.

◆ Degree()

int ON_PolyCurve::Degree ( ) const

overridevirtual

Returns maximum algebraic degree of any span or a good estimate if curve spans are not algebraic.

Returns: degree

Implements ON_Curve.

◆ Destroy()

void ON_PolyCurve::Destroy ( )

◆ DestroyRuntimeCache()

void ON_PolyCurve::DestroyRuntimeCache ( bool bDelete = true )

overridevirtual

virtual ON_Object::DestroyRuntimeCache override

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeCurve.

◆ Dimension()

int ON_PolyCurve::Dimension ( ) const

overridevirtual

ON_Geometry overrides.

Reimplemented from ON_Geometry.

◆ Domain()

ON_Interval ON_PolyCurve::Domain ( ) const

overridevirtual

Returns: domain of the curve.

Implements ON_Curve.

◆ Dump()

void ON_PolyCurve::Dump ( ON_TextLog & ) const

overridevirtual

Creates a text dump of the object.

Dump() is intended for debugging and is not suitable for creating high quality text descriptions of an object.

The default implementations of this virtual function prints the class's name.

Reimplemented from ON_Object.

◆ DuplicateCurve()

ON_Curve* ON_PolyCurve::DuplicateCurve ( ) const

overridevirtual

ON_Curve overrides.

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeCurve.

◆ EmergencyDestroy()

void ON_PolyCurve::EmergencyDestroy ( )

◆ Evaluate()

bool ON_PolyCurve::Evaluate	(	double	t,
		int	der_count,
		int	v_stride,
		double *	v,
		int	side = `0`,
		int *	hint = `0`
	)		const

overridevirtual

This evaluator actually does all the work. The other ON_Curve evaluation tools call this virtual function.

Parameters

t	[in] evaluation parameter ( usually in Domain() ).
der_count	[in] (>=0) number of derivatives to evaluate
v_stride	[in] (>=Dimension()) stride to use for the v[] array
v	[out] array of length (der_count+1)v_stride curve(t) is returned in (v[0],...,v[m_dim-1]), curve'(t) is retuned in (v[v_stride],...,v[v_stride+m_dim-1]), curve"(t) is retuned in (v[2v_stride],...,v[2*v_stride+m_dim-1]), etc.
side	[in] optional - determines which side to evaluate from =0 default <0 to evaluate from below, >0 to evaluate from above
hint	[in/out] optional evaluation hint used to speed repeated evaluations

Returns: false if unable to evaluate.

See also: ON_Curve::EvPoint, ON_Curve::Ev1Der, ON_Curve::Ev2Der

Implements ON_Curve.

◆ EvaluatePoint()

bool ON_PolyCurve::EvaluatePoint	(	const class ON_ObjRef &	objref,
		ON_3dPoint &	P
	)		const

overridevirtual

virtual ON_Geometry override

Reimplemented from ON_Curve.

◆ Extend()

bool ON_PolyCurve::Extend ( const ON_Interval & domain )

overridevirtual

Where possible, analytically extends curve to include domain.

Parameters

domain [in] if domain is not included in curve domain, curve will be extended so that its domain includes domain. Will not work if curve is closed. Original curve is identical to the restriction of the resulting curve to the original curve domain,

Returns: true if successful.

Reimplemented from ON_Curve.

◆ FindNextGap()

int ON_PolyCurve::FindNextGap ( int segment_index0 ) const

Search the curve for gaps between the sub curve segments.

Parameters

segment_index0 [in] The search for gaps starts at with the comparing the end of segment[segment_index0] and the start of segment[segment_index0+1].

Returns: 0: No gaps were found. i > segment_index0: The end of polycuve segment[i-1] is not coincident with the start of polycurve segment[i].

◆ FirstSegmentCurve()

ON_Curve* ON_PolyCurve::FirstSegmentCurve ( ) const

◆ GetBBox()

bool ON_PolyCurve::GetBBox	(	double *	boxmin,
		double *	boxmax,
		bool	bGrowBox = `false`
	)		const

overridevirtual

virtual ON_Geometry GetBBox override

Reimplemented from ON_Geometry.

◆ GetCurveParameterFromNurbFormParameter()

bool ON_PolyCurve::GetCurveParameterFromNurbFormParameter	(	double	,
		double *
	)		const

overridevirtual

virtual ON_Curve::GetCurveParameterFromNurbFormParameter override

Reimplemented from ON_Curve.

◆ GetNextDiscontinuity()

bool ON_PolyCurve::GetNextDiscontinuity	(	ON::continuity	c,
		double	t0,
		double	t1,
		double *	t,
		int *	hint = `nullptr`,
		int *	dtype = `nullptr`,
		double	cos_angle_tolerance = `ON_DEFAULT_ANGLE_TOLERANCE_COSINE`,
		double	curvature_tolerance = `ON_SQRT_EPSILON`
	)		const

overridevirtual

Search for a derivatitive, tangent, or curvature discontinuity.

Parameters

c	[in] type of continity to test for. If ON::continuity::C1_continuous
t0	[in] search begins at t0
t1	[in] (t0 < t1) search ends at t1
t	[out] if a discontinuity is found, the *t reports the parameter at the discontinuity.
hint	[in/out] if GetNextDiscontinuity will be called repeatedly, passing a "hint" with initial value *hint=0 will increase the speed of the search.
dtype	[out] if not nullptr, dtype reports the kind of discontinuity found at t. A value of 1 means the first derivative or unit tangent was discontinuous. A value of 2 means the second derivative or curvature was discontinuous.
cos_angle_tolerance	[in] default = cos(1 degree) Used only when c is ON::continuity::G1_continuous or ON::continuity::G2_continuous. If the cosine of the angle between two tangent vectors is <= cos_angle_tolerance, then a G1 discontinuity is reported.
curvature_tolerance	[in] (default = ON_SQRT_EPSILON) Used only when c is ON::continuity::G2_continuous or ON::continuity::Gsmooth_continuous. ON::continuity::G2_continuous: If K0 and K1 are curvatures evaluated from above and below and \|K0 - K1\| > curvature_tolerance, then a curvature discontinuity is reported. ON::continuity::Gsmooth_continuous: If K0 and K1 are curvatures evaluated from above and below and the angle between K0 and K1 is at least twice angle tolerance or \|\|K0\| - \|K1\|\| > (max(\|K0\|,\|K1\|) > curvature_tolerance, then a curvature discontinuity is reported.

Returns: true if a discontinuity was found on the interior of the interval (t0,t1).

Overrides ON_Curve::GetNextDiscontinuity.

Reimplemented from ON_Curve.

◆ GetNurbForm()

int ON_PolyCurve::GetNurbForm	(	ON_NurbsCurve &	nurbs_curve,
		double	tolerance = `0.0`,
		const ON_Interval *	subdomain = `nullptr`
	)		const

overridevirtual

Get a NURBS curve representation of this curve.

Parameters

nurbs_curve	[out] NURBS representation returned here
tolerance	[in] tolerance to use when creating NURBS representation.
subdomain	[in] if not nullptr, then the NURBS representation for this portion of the curve is returned.

Returns: 0 unable to create NURBS representation with desired accuracy. 1 success - returned NURBS parameterization matches the curve's to wthe desired accuracy 2 success - returned NURBS point locus matches the curve's to the desired accuracy and the domain of the NURBS curve is correct. On However, This curve's parameterization and the NURBS curve parameterization may not match to the desired accuracy. This situation happens when getting NURBS representations of curves that have a transendental parameterization like circles

This is a low-level virtual function. If you do not need the parameterization information provided by the return code, then ON_Curve::NurbsCurve may be easier to use.

See also: ON_Curve::NurbsCurve

Reimplemented from ON_Curve.

◆ GetNurbFormParameterFromCurveParameter()

bool ON_PolyCurve::GetNurbFormParameterFromCurveParameter	(	double	,
		double *
	)		const

overridevirtual

virtual ON_Curve::GetNurbFormParameterFromCurveParameter override

Reimplemented from ON_Curve.

◆ GetSpanVector()

bool ON_PolyCurve::GetSpanVector ( double * knots ) const

overridevirtual

Get number of parameters of "knots".

Parameters

knots [out] an array of length SpanCount()+1 is filled in with the parameters where the curve is not smooth (C-infinity).

Returns: true if successful

Implements ON_Curve.

◆ GetTightBoundingBox()

bool ON_PolyCurve::GetTightBoundingBox	(	class ON_BoundingBox &	tight_bbox,
		bool	bGrowBox = `false`,
		const class ON_Xform *	xform = `nullptr`
	)		const

overridevirtual

virtual ON_Geometry GetTightBoundingBox override

Reimplemented from ON_Curve.

◆ HarvestSegment()

ON_Curve* ON_PolyCurve::HarvestSegment ( int )

◆ HasGapAt()

bool ON_PolyCurve::HasGapAt ( int segment_index ) const

Determine if there is a gap between the end of segment[segment_index] and the start of segment[segment_index+1].

Parameters

segment_index [in] >= 0

Returns: true: segment_index was valid and there is a gap between the end of segment[segment_index] and the start of segment[segment_index+1].

◆ HasNurbForm()

int ON_PolyCurve::HasNurbForm ( ) const

overridevirtual

Does a NURBS curve representation of this curve.

Returns: 0 unable to create NURBS representation with desired accuracy. 1 success - NURBS parameterization matches the curve's to wthe desired accuracy 2 success - NURBS point locus matches the curve's and the domain of the NURBS curve is correct. However, This curve's parameterization and the NURBS curve parameterization may not match. This situation happens when getting NURBS representations of curves that have a transendental parameterization like circles

This is a low-level virtual function.

See also: ON_Curve::GetNurbForm, ON_Curve::NurbsCurve

Reimplemented from ON_Curve.

◆ HasSynchronizedSegmentDomains()

bool ON_PolyCurve::HasSynchronizedSegmentDomains ( ) const

Returns: True if the domains of the curves in the m_segment[] array exactly match the domains of the segments specified in the m_t[] array. Put another way, returns true if SegmentDomain(i) = SegmentCurve(i).Domain() for every segment index.

◆ Insert()

bool ON_PolyCurve::Insert	(	int	,
		ON_Curve *
	)

◆ IsArc()

bool ON_PolyCurve::IsArc	(	const ON_Plane *	plane = `nullptr`,
		ON_Arc *	arc = `nullptr`,
		double	tolerance = `ON_ZERO_TOLERANCE`
	)		const

overridevirtual

Test a curve to see if the locus if its points is an arc or circle.

Parameters

plane	[in] if not nullptr, test is performed in this plane
arc	[out] if not nullptr and true is returned, then arc parameters are filled in
tolerance	[in] tolerance to use when checking

Returns: ON_Arc.m_angle > 0 if curve locus is an arc between specified points. If ON_Arc.m_angle is 2.0*ON_PI, then the curve is a circle.

Reimplemented from ON_Curve.

◆ IsClosed()

bool ON_PolyCurve::IsClosed ( void ) const

overridevirtual

Test a curve to see if it is closed.

Returns: true if the curve is closed.

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeCurve.

◆ IsContinuous()

bool ON_PolyCurve::IsContinuous	(	ON::continuity	c,
		double	t,
		int *	hint = `nullptr`,
		double	point_tolerance = `ON_ZERO_TOLERANCE`,
		double	d1_tolerance = `ON_ZERO_TOLERANCE`,
		double	d2_tolerance = `ON_ZERO_TOLERANCE`,
		double	cos_angle_tolerance = `ON_DEFAULT_ANGLE_TOLERANCE_COSINE`,
		double	curvature_tolerance = `ON_SQRT_EPSILON`
	)		const

overridevirtual

Test continuity at a curve parameter value.

Parameters

c	[in] continuity to test for
t	[in] parameter to test
hint	[in] evaluation hint
point_tolerance	[in] if the distance between two points is greater than point_tolerance, then the curve is not C0.
d1_tolerance	[in] if the difference between two first derivatives is greater than d1_tolerance, then the curve is not C1.
d2_tolerance	[in] if the difference between two second derivatives is greater than d2_tolerance, then the curve is not C2.
cos_angle_tolerance	[in] default = cos(1 degree) Used only when c is ON::continuity::G1_continuous or ON::continuity::G2_continuous. If the cosine of the angle between two tangent vectors is <= cos_angle_tolerance, then a G1 discontinuity is reported.
curvature_tolerance	[in] (default = ON_SQRT_EPSILON) Used only when c is ON::continuity::G2_continuous or ON::continuity::Gsmooth_continuous. ON::continuity::G2_continuous: If K0 and K1 are curvatures evaluated from above and below and \|K0 - K1\| > curvature_tolerance, then a curvature discontinuity is reported. ON::continuity::Gsmooth_continuous: If K0 and K1 are curvatures evaluated from above and below and the angle between K0 and K1 is at least twice angle tolerance or \|\|K0\| - \|K1\|\| > (max(\|K0\|,\|K1\|) > curvature_tolerance, then a curvature discontinuity is reported.

Returns: true if the curve has at least the c type continuity at the parameter t.

Overrides ON_Curve::IsContinuous.

Reimplemented from ON_Curve.

◆ IsDeformable()

bool ON_PolyCurve::IsDeformable ( ) const

overridevirtual

virtual ON_Geometry::IsDeformable() override

Reimplemented from ON_Geometry.

◆ IsInPlane()

bool ON_PolyCurve::IsInPlane	(	const ON_Plane &	test_plane,
		double	tolerance = `ON_ZERO_TOLERANCE`
	)		const

overridevirtual

Test a curve to see if it lies in a specific plane.

Parameters

test_plane	[in]
tolerance	[in] tolerance to use when checking

Returns: true if the maximum distance from the curve to the test_plane is <= tolerance.

Implements ON_Curve.

◆ IsLinear()

bool ON_PolyCurve::IsLinear ( double tolerance = ON_ZERO_TOLERANCE ) const

overridevirtual

Test a curve to see if the locus if its points is a line segment.

Parameters

tolerance [in] // tolerance to use when checking linearity

Returns: true if the ends of the curve are farther than tolerance apart and the maximum distance from any point on the curve to the line segment connecting the curve's ends is <= tolerance.

Reimplemented from ON_Curve.

◆ IsNested()

bool ON_PolyCurve::IsNested ( ) const

Returns: True if a curve in the m_segment[] array is an ON_PolyCurve.

◆ IsPeriodic()

bool ON_PolyCurve::IsPeriodic ( void ) const

overridevirtual

Test a curve to see if it is periodic.

Returns: true if the curve is closed and at least C2 at the start/end.

Reimplemented from ON_Curve.

◆ IsPlanar()

bool ON_PolyCurve::IsPlanar	(	ON_Plane *	plane = `nullptr`,
		double	tolerance = `ON_ZERO_TOLERANCE`
	)		const

overridevirtual

Test a curve to see if it is planar.

Parameters

plane	[out] if not nullptr and true is returned, the plane parameters are filled in.
tolerance	[in] tolerance to use when checking

Returns: true if there is a plane such that the maximum distance from the curve to the plane is <= tolerance.

Reimplemented from ON_Curve.

◆ IsPolyline()

int ON_PolyCurve::IsPolyline	(	ON_SimpleArray< ON_3dPoint > *	pline_points = `nullptr`,
		ON_SimpleArray< double > *	pline_t = `nullptr`
	)		const

overridevirtual

Several types of ON_Curve can have the form of a polyline including a degree 1 ON_NurbsCurve, an ON_PolylineCurve, and an ON_PolyCurve all of whose segments are some form of polyline. IsPolyline tests a curve to see if it can be represented as a polyline.

Parameters

pline_points	[out] if not nullptr and true is returned, then the points of the polyline form are returned here.
t	[out] if not nullptr and true is returned, then the parameters of the polyline points are returned here.

Returns: table 0 curve is not some form of a polyline >=2 number of points in polyline form

Reimplemented from ON_Curve.

◆ IsValid() [1/2]

bool ON_PolyCurve::IsValid ( class ON_TextLog * text_log = nullptr ) const

overridevirtual

Tests an object to see if its data members are correctly initialized.

Parameters

text_log	[in] if the object is not valid and text_log is not nullptr, then a brief englis description of the reason the object is not valid is appened to the log. The information appended to text_log is suitable for
low	level debugging purposes by programmers and is not intended to be useful as a high level user interface tool.

Returns: table true object is valid false object is invalid, uninitialized, etc.

Reimplemented from ON_Geometry.

◆ IsValid() [2/2]

bool ON_PolyCurve::IsValid	(	bool	bAllowGaps,
		ON_TextLog *	text_log
	)		const

Tests an object to see if its data members are correctly initialized.

Parameters

bAllowGaps	[in] If true, gaps are allowed between polycurve segments. If false, gaps are not allowed between polycurve segments.
text_log	[in] if the object is not valid and text_log is not nullptr, then a brief englis description of the reason the object is not valid is appened to the log. The information appended to text_log is suitable for
low	level debugging purposes by programmers and is not intended to be useful as a high level user interface tool.

Returns: table true object is valid false object is invalid, uninitialized, etc.

Overrides virtual ON_Object::IsValid

◆ LastSegmentCurve()

ON_Curve* ON_PolyCurve::LastSegmentCurve ( ) const

◆ MakeDeformable()

bool ON_PolyCurve::MakeDeformable ( )

overridevirtual

virtual ON_Geometry::MakeDeformable() override

Reimplemented from ON_Geometry.

◆ ON_DEPRECATED_MSG() [1/2]

ON_PolyCurve::ON_DEPRECATED_MSG ( "Replace calls to HasGap() with FindNextGap(0)" ) const

◆ ON_DEPRECATED_MSG() [2/2]

ON_PolyCurve::ON_DEPRECATED_MSG ( "Use RemoveNesting(). RemoveNestingEx() will be removed in the next release." )

◆ operator=()

ON_PolyCurve& ON_PolyCurve::operator= ( const ON_PolyCurve & )

◆ operator[]()

ON_Curve* ON_PolyCurve::operator[] ( int ) const

These operator[] functions return nullptr if index is out of range.

◆ ParameterSearch()

bool ON_PolyCurve::ParameterSearch	(	double	t,
		int &	index,
		bool	bEnableSnap
	)		const

Lookup a parameter in the m_t array, optionally using a built in snap tolerance to snap a parameter value to an element of m_t.

Parameters

t	[in] parameter
index	[out] index into m_t such that if the function returns true then t is equal to, or is within tolerance of m_t[index]. if function returns false then the value of index is

condition value of index t<m_t[0] or m_t is empty -1 m_t[i] < t < m_t[i+1] i for 0<=i<=m_t.Count()-2 t>m_t[ m_t.Count()-1] m_t.Count()-1

Parameters

bEnableSnap [in] if true use tolerance when comparing to m_t values Returns true if the t is exactly equal to, or within tolerance of (only if bEnableSnap==true) m_t[index].

◆ PolyCurveParameter()

double ON_PolyCurve::PolyCurveParameter	(	int	segment_index,
		double	segmentcurve_parameter
	)		const

Converts a segment curve parameter to a polycurve parameter.

Parameters

segment_index	[in]
segmentcurve_parameter	[in]

Returns: Polycurve evaluation parameter or ON_UNSET_VALUE if the polycurve curve parameter cannot be computed.

See also: ON_PolyCurve::SegmentCurveParameter

◆ Prepend()

bool ON_PolyCurve::Prepend ( ON_Curve * )

◆ PrependAndMatch()

bool ON_PolyCurve::PrependAndMatch ( ON_Curve * )

◆ Read()

bool ON_PolyCurve::Read ( ON_BinaryArchive & binary_archive )

overridevirtual

Low level archive writing tool used by ON_BinaryArchive::ReadObject().

Parameters

binary_archive archive to read from

Returns: Returns true if the read is successful.

Use ON_BinaryArchive::ReadObject() to read objects. This Read() function should read the objects definition back into its data members.

The default implementation of this virtual function returns false and does nothing.

Reimplemented from ON_Object.

◆ Remove() [1/2]

bool ON_PolyCurve::Remove ( )

◆ Remove() [2/2]

bool ON_PolyCurve::Remove ( int )

◆ RemoveNesting()

bool ON_PolyCurve::RemoveNesting ( )

Removes the nested of polycurves. The result will have not have an ON_PolyCurve as a segment but will have identical locus and parameterization.

Returns: True if a nested polycurve was removed. False if no nested polycurves were found.

◆ Reserve()

void ON_PolyCurve::Reserve ( int )

◆ Reverse()

bool ON_PolyCurve::Reverse ( )

overridevirtual

Reverse the direction of the curve.

Returns: true if curve was reversed.

If reveresed, the domain changes from [a,b] to [-b,-a]

Implements ON_Curve.

◆ SegmentCurve()

ON_Curve* ON_PolyCurve::SegmentCurve ( int segment_index ) const

Returns a pointer to a segment curve.

Parameters

segment_index [in] 0 based index (0 <= segment_index < Count() )

Returns: A pointer to the segment curve. Returns nullptr if segment_index < 0 or segment_index >= Count().

◆ SegmentCurveParameter()

double ON_PolyCurve::SegmentCurveParameter ( double polycurve_parameter ) const

Converts a polycurve parameter to a segment curve parameter.

Parameters

polycurve_parameter [in]

Returns: Segment curve evaluation parameter or ON_UNSET_VALUE if the segment curve parameter cannot be computed.

See also: ON_PolyCurve::PolyCurveParameter

◆ SegmentCurves()

const ON_CurveArray& ON_PolyCurve::SegmentCurves ( ) const

Returns: Reference to m_segment.

◆ SegmentDomain()

ON_Interval ON_PolyCurve::SegmentDomain ( int segment_index ) const

Returns the polycurve subdomain assigned to a segment curve.

Parameters

segment_index [in] 0 based index (0 <= segment_index < Count() )

Returns: The polycurve subdomain assigned to a segment curve. Returns ([ON_UNSET_VALUE,ON_UNSET_VALUE) if segment_index < 0 or segment_index >= Count().

◆ SegmentIndex() [1/2]

int ON_PolyCurve::SegmentIndex ( double polycurve_parameter ) const

Find the segment used for evaluation at polycurve_parameter.

Parameters

polycurve_parameter [in]

Returns: index of the segment used for evaluation at polycurve_parameter. If polycurve_parameter < Domain.Min(), then 0 is returned. If polycurve_parameter > Domain.Max(), then Count()-1 is returned.

◆ SegmentIndex() [2/2]

int ON_PolyCurve::SegmentIndex	(	ON_Interval	sub_domain,
		int *	segment_index0,
		int *	segment_index1
	)		const

Find the segments with support on sub_domain.

Parameters

sub_domain	[in] increasing interval
segment_index0	[out]
segment_index1	[out] segments with index i where segment_index0 <= i < segment_index1 are the segments with support on the sub_domain

Returns: number of segments with support on sub_domain.

◆ SegmentParameters()

const ON_SimpleArray<double>& ON_PolyCurve::SegmentParameters ( ) const

Returns: Reference to m_t.

◆ SetDomain()

bool ON_PolyCurve::SetDomain	(	double	t0,
		double	t1
	)

overridevirtual

virtual ON_Curve::SetDomain override. Set the domain of the curve

Parameters

t0	[in]
t1	[in] new domain will be [t0,t1]

Returns: true if successful.

Reimplemented from ON_Curve.

◆ SetEndPoint()

bool ON_PolyCurve::SetEndPoint ( ON_3dPoint end_point )

overridevirtual

Force the curve to end at a specified point.

Parameters

end_point [in]

Returns: true if successful.

Some end points cannot be moved. Be sure to check return code.

See also: ON_Curve::SetStartPoint, ON_Curve::PointAtStart, ON_Curve::PointAtEnd

virtual

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeCurve.

◆ SetParameterization()

bool ON_PolyCurve::SetParameterization ( const double * t )

Expert user function to set the m_t[] array.

Parameters

t	[in] increasing array of SegmentCount()+1 parameters. Returns True if successful.

◆ SetSegment()

void ON_PolyCurve::SetSegment	(	int	index,
		ON_Curve *	crv
	)

◆ SetStartPoint()

bool ON_PolyCurve::SetStartPoint ( ON_3dPoint start_point )

overridevirtual

Force the curve to start at a specified point.

Parameters

start_point [in]

Returns: true if successful.

Some start points cannot be moved. Be sure to check return code.

See also: ON_Curve::SetEndPoint, ON_Curve::PointAtStart, ON_Curve::PointAtEnd

virtual

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeCurve.

◆ SizeOf()

unsigned int ON_PolyCurve::SizeOf ( ) const

overridevirtual

ON_Object overrides.

virtual ON_Object::SizeOf override

Reimplemented from ON_Curve.

◆ SpanCount()

int ON_PolyCurve::SpanCount ( ) const

overridevirtual

Get number of nonempty smooth (c-infinity) spans in curve

Returns: Number of nonempty smooth (c-infinity) spans.

Implements ON_Curve.

◆ Split()

bool ON_PolyCurve::Split	(	double	t,
		ON_Curve *&	left_side,
		ON_Curve *&	right_side
	)		const

overridevirtual

virtual ON_Curve::Split override. Divide the curve at the specified parameter. The parameter must be in the interior of the curve's domain. The pointers passed to Split must either be nullptr or point to an ON_Curve object of the same of the same type. If the pointer is nullptr, then a curve will be created in Split(). You may pass "this" as one of the pointers to Split().

Parameters

t	[in] parameter in interval Domain().
left_side	[out] left portion of curve
right_side	[out] right portion of curve

For example, if crv were an ON_NurbsCurve, then
   ON_NurbsCurve right_side;
   crv.Split( crv.Domain().Mid() &crv, &right_side );
would split crv at the parametric midpoint, put the left side
in crv, and return the right side in right_side.

Reimplemented from ON_Curve.

◆ SwapCoordinates()

bool ON_PolyCurve::SwapCoordinates	(	int	i,
		int	j
	)

overridevirtual

Swaps object coordinate values with indices i and j.

Parameters

i	[in] coordinate index
j	[in] coordinate index

The default implementation uses the virtual Transform() function to calculate the result. If you are creating an object where Transform() is slow, coordinate swapping will be frequently used, and coordinate swapping can be quickly accomplished, then override this function.

@verbatim
    ON_Point point(7,8,9);
    point.SwapCoordinates(0,2);
    // point = (9,8,7)
@endverbatim

Reimplemented from ON_Geometry.

◆ SynchronizeSegmentDomains()

bool ON_PolyCurve::SynchronizeSegmentDomains ( )

Sets the domain of the curve int the m_segment[] array to exactly match the domain defined in the m_t[] array. This is not required, but can simplify some coding situations.

Returns: True if at least one segment was reparameterized. False if no changes were made.

◆ Transform()

bool ON_PolyCurve::Transform ( const ON_Xform & xform )

overridevirtual

overrides virtual ON_Geometry::Transform(). ON_Curve::Transform() calls ON_Geometry::Transform(xform), which calls ON_Object::TransformUserData(xform), and then calls this->DestroyCurveTree().

Parameters

xform [in] transformation to apply to object.

Classes derived from ON_Curve should call ON_Curve::Transform() to handle user data transformations and curve tree destruction and then transform their definition.

Reimplemented from ON_Curve.

◆ Trim()

bool ON_PolyCurve::Trim ( const ON_Interval & domain )

overridevirtual

virtual ON_Curve::Trim override. Removes portions of the curve outside the specified interval.

Parameters

domain [in] interval of the curve to keep. Portions of the curve before curve(domain[0]) and after curve(domain[1]) are removed.

Returns: true if successful.

Reimplemented from ON_Curve.

◆ Write()

bool ON_PolyCurve::Write ( ON_BinaryArchive & binary_archive ) const

overridevirtual

Low level archive writing tool used by ON_BinaryArchive::WriteObject().

Parameters

binary_archive archive to write to

Returns: Returns true if the write is successful.

Use ON_BinaryArchive::WriteObject() to write objects. This Write() function should just write the specific definition of this object. It should not write and any chunk typecode or length information.

The default implementation of this virtual function returns false and does nothing.

Reimplemented from ON_Object.

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ON_PolyCurve() [1/3]

◆ ~ON_PolyCurve()

◆ ON_PolyCurve() [2/3]

◆ ON_PolyCurve() [3/3]

Member Function Documentation

◆ Append()

◆ AppendAndMatch()

◆ ChangeClosedCurveSeam()

◆ ChangeDimension()

◆ CloseGap()

◆ CloseGaps()

◆ Count()

◆ DataCRC()

◆ Degree()

◆ Destroy()

◆ DestroyRuntimeCache()

◆ Dimension()

◆ Domain()

◆ Dump()

◆ DuplicateCurve()

◆ EmergencyDestroy()

◆ Evaluate()

◆ EvaluatePoint()

◆ Extend()

◆ FindNextGap()

◆ FirstSegmentCurve()

◆ GetBBox()

◆ GetCurveParameterFromNurbFormParameter()

◆ GetNextDiscontinuity()

◆ GetNurbForm()

◆ GetNurbFormParameterFromCurveParameter()

◆ GetSpanVector()

◆ GetTightBoundingBox()

◆ HarvestSegment()

◆ HasGapAt()

◆ HasNurbForm()

◆ HasSynchronizedSegmentDomains()

◆ Insert()

◆ IsArc()

◆ IsClosed()

◆ IsContinuous()

◆ IsDeformable()

◆ IsInPlane()

◆ IsLinear()

◆ IsNested()

◆ IsPeriodic()

◆ IsPlanar()

◆ IsPolyline()

◆ IsValid() [1/2]

◆ IsValid() [2/2]

◆ LastSegmentCurve()

◆ MakeDeformable()

◆ ON_DEPRECATED_MSG() [1/2]

◆ ON_DEPRECATED_MSG() [2/2]

◆ operator=()

◆ operator[]()

◆ ParameterSearch()

◆ PolyCurveParameter()

◆ Prepend()

◆ PrependAndMatch()

◆ Read()

◆ Remove() [1/2]

◆ Remove() [2/2]

◆ RemoveNesting()

◆ Reserve()

◆ Reverse()

◆ SegmentCurve()

◆ SegmentCurveParameter()

◆ SegmentCurves()

◆ SegmentDomain()

◆ SegmentIndex() [1/2]

◆ SegmentIndex() [2/2]

◆ SegmentParameters()

◆ SetDomain()

◆ SetEndPoint()

◆ SetParameterization()