#include <opennurbs_curveproxy.h>

Inheritance diagram for ON_CurveProxy:

Public Member Functions
	ON_CurveProxy () ON_NOEXCEPT

	ON_CurveProxy (const ON_CurveProxy &)

	ON_CurveProxy (const ON_Curve *)

	ON_CurveProxy (const ON_Curve *, ON_Interval)

virtual	~ON_CurveProxy ()

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

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

ON_Interval	Domain () const override
	ON_Curve overrides. More...

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

ON_Curve *	DuplicateCurve () const override
	Get a duplicate of the curve. More...

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	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	GetParameterTolerance (double, double , double ) const override
	(optional - override if curve is piecewise smooth) More...

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

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

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	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	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
	virtual override of ON_Curve::IsPolyline More...

bool	IsValid (class ON_TextLog *text_log=nullptr) const override
	ON_Object overrides. More...

ON_CurveProxy &	operator= (const ON_CurveProxy &)

const ON_Curve *	ProxyCurve () const

ON_Interval	ProxyCurveDomain () const

bool	ProxyCurveIsReversed () const

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

double	RealCurveParameter (double t) const

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

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

bool	SetDomain (ON_Interval domain)

void	SetProxyCurve (const ON_Curve *real_curve)
	Sets the curve geometry that "this" is a proxy for. Sets proxy domain to proxy_curve->Domain(). More...

void	SetProxyCurve (const ON_Curve *real_curve, ON_Interval real_curve_subdomain)
	Sets the curve geometry that "this" is a proxy for. Sets proxy domain to proxy_curve->Domain(). More...

bool	SetProxyCurveDomain (ON_Interval proxy_curve_subdomain)
	Sets portion of the "real" curve that this proxy represents. Does NOT change the domain of "this" curve. More...

unsigned int	SizeOf () const override
	virtual ON_Object::SizeOf override 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
	override of virtual ON_Curve::Split More...

double	ThisCurveParameter (double real_curve_parameter) const

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
	override of virtual ON_Curve::Trim 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 ()

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

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

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

virtual bool	Extend (const ON_Interval &domain)
	Pure virtual function. Default returns false. Where possible, analytically extends curve to include domain. 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	GetSpanVectorIndex (double t, int side, int span_vector_index, ON_Interval span_domain) const

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

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...

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

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

virtual bool	IsDeformable () const

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

virtual bool	MakeDeformable ()
	If possible, converts the object into a form that can be accuratly modified with "squishy" transformations like projections, shears, an non-uniform scaling. 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...

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

Protected Member Functions
void	SetProxyCurveIsReversed (bool bReversed)

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...

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

Constructor & Destructor Documentation

◆ ON_CurveProxy() [1/4]

ON_CurveProxy::ON_CurveProxy ( )

◆ ~ON_CurveProxy()

virtual ON_CurveProxy::~ON_CurveProxy ( )

virtual

◆ ON_CurveProxy() [2/4]

ON_CurveProxy::ON_CurveProxy ( const ON_CurveProxy & )

◆ ON_CurveProxy() [3/4]

ON_CurveProxy::ON_CurveProxy ( const ON_Curve * )

◆ ON_CurveProxy() [4/4]

ON_CurveProxy::ON_CurveProxy	(	const ON_Curve *	,
		ON_Interval
	)

Member Function Documentation

◆ DataCRC()

ON__UINT32 ON_CurveProxy::DataCRC ( ON__UINT32 current_remainder ) const

overridevirtual

virtual ON_Object::DataCRC override

Reimplemented from ON_Object.

◆ Degree()

int ON_CurveProxy::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.

◆ DestroyRuntimeCache()

void ON_CurveProxy::DestroyRuntimeCache ( bool bDelete = true )

overridevirtual

virtual ON_Object::DestroyRuntimeCache override

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeSegment.

◆ Dimension()

int ON_CurveProxy::Dimension ( ) const

overridevirtual

ON_Geometry overrides.

Reimplemented from ON_Geometry.

◆ Domain()

ON_Interval ON_CurveProxy::Domain ( ) const

overridevirtual

ON_Curve overrides.

Returns: domain of the curve.

If m_bReverse is true, this returns the reverse of m_domain.

Implements ON_Curve.

◆ Dump()

void ON_CurveProxy::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_CurveProxy::DuplicateCurve ( ) const

overridevirtual

Get a duplicate of the curve.

Returns: A duplicate of the curve.

The caller must delete the returned curve. For non-ON_CurveProxy objects, this simply duplicates the curve using ON_Object::Duplicate. For ON_CurveProxy objects, this duplicates the actual proxy curve geometry and, if necessary, trims and reverse the result to that the returned curve's parameterization and locus match the proxy curve's.

Reimplemented from ON_Curve.

Reimplemented in ON_PolyEdgeSegment.

◆ Evaluate()

bool ON_CurveProxy::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.

◆ GetBBox()

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

overridevirtual

virtual ON_Geometry GetBBox override

Reimplemented from ON_Geometry.

◆ GetCurveParameterFromNurbFormParameter()

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

overridevirtual

virtual ON_Curve::GetCurveParameterFromNurbFormParameter override

Reimplemented from ON_Curve.

◆ GetNextDiscontinuity()

bool ON_CurveProxy::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_CurveProxy::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_CurveProxy::GetNurbFormParameterFromCurveParameter	(	double	,
		double *
	)		const

overridevirtual

virtual ON_Curve::GetNurbFormParameterFromCurveParameter override

Reimplemented from ON_Curve.

◆ GetParameterTolerance()

bool ON_CurveProxy::GetParameterTolerance	(	double	,
		double *	,
		double *
	)		const

overridevirtual

(optional - override if curve is piecewise smooth)

Reimplemented from ON_Curve.

◆ GetSpanVector()

bool ON_CurveProxy::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.

◆ HasNurbForm()

int ON_CurveProxy::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.

◆ IsArc()

bool ON_CurveProxy::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_CurveProxy::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_PolyEdgeSegment.

◆ IsContinuous()

bool ON_CurveProxy::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.

◆ IsInPlane()

bool ON_CurveProxy::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_CurveProxy::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.

◆ IsPeriodic()

bool ON_CurveProxy::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_CurveProxy::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_CurveProxy::IsPolyline	(	ON_SimpleArray< ON_3dPoint > *	pline_points = `nullptr`,
		ON_SimpleArray< double > *	pline_t = `nullptr`
	)		const

overridevirtual

virtual override of ON_Curve::IsPolyline

Reimplemented from ON_Curve.

◆ IsValid()

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

overridevirtual

ON_Object overrides.

Reimplemented from ON_Object.

◆ operator=()

ON_CurveProxy& ON_CurveProxy::operator= ( const ON_CurveProxy & )

◆ ProxyCurve()

const ON_Curve* ON_CurveProxy::ProxyCurve ( ) const

Returns: "Real" curve geometry that "this" is a proxy for.

◆ ProxyCurveDomain()

ON_Interval ON_CurveProxy::ProxyCurveDomain ( ) const

Returns: Sub interval of the "real" curve's domain that "this" uses. This interval is not necessarily the same as "this" curve's domain.

This function is poorly named. It does NOT get the proxy curve's domain. It does get the evaluation interval of the "real" curve for which "this" is a proxy.

◆ ProxyCurveIsReversed()

bool ON_CurveProxy::ProxyCurveIsReversed ( ) const

Returns: True if "this" as a curve is reversed from the "real" curve geometry.

◆ Read()

bool ON_CurveProxy::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.

Reimplemented in ON_PolyEdgeSegment.

◆ RealCurveParameter()

double ON_CurveProxy::RealCurveParameter ( double t ) const

Parameters

t	[in] parameter for "this" curve

Returns: Corresponding parameter in m_real_curve's domain.

◆ Reverse()

bool ON_CurveProxy::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.

◆ SetDomain() [1/2]

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

overridevirtual

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.

◆ SetDomain() [2/2]

bool ON_CurveProxy::SetDomain ( ON_Interval domain )

◆ SetProxyCurve() [1/2]

void ON_CurveProxy::SetProxyCurve ( const ON_Curve * real_curve )

Sets the curve geometry that "this" is a proxy for. Sets proxy domain to proxy_curve->Domain().

Parameters

real_curve [in]

◆ SetProxyCurve() [2/2]

void ON_CurveProxy::SetProxyCurve	(	const ON_Curve *	real_curve,
		ON_Interval	real_curve_subdomain
	)

Sets the curve geometry that "this" is a proxy for. Sets proxy domain to proxy_curve->Domain().

Parameters

real_curve	[in]
real_curve_subdomain	[in] increasing sub interval of
real_curve	>Domain(). This interval defines the portion the "real" curve geometry that "this" proxy uses.
bReversed	[in] true if the parameterization of "this" proxy as a curve is reversed from the underlying "real" curve geometry.

◆ SetProxyCurveDomain()

bool ON_CurveProxy::SetProxyCurveDomain ( ON_Interval proxy_curve_subdomain )

Sets portion of the "real" curve that this proxy represents. Does NOT change the domain of "this" curve.

Parameters

proxy_curve_subdomain [in] increasing sub interval of ProxyCurve()->Domain(). This interval defines the portion the curve geometry that "this" proxy uses.

This function is poorly named. It does NOT set the proxy curve's domain. It does set the interval of the "real" curve for which "this" is a proxy.

◆ SetProxyCurveIsReversed()

void ON_CurveProxy::SetProxyCurveIsReversed ( bool bReversed )

protected

◆ SizeOf()

unsigned int ON_CurveProxy::SizeOf ( ) const

overridevirtual

virtual ON_Object::SizeOf override

Reimplemented from ON_Curve.

◆ SpanCount()

int ON_CurveProxy::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_CurveProxy::Split	(	double	t,
		ON_Curve *&	left_side,
		ON_Curve *&	right_side
	)		const

overridevirtual

override of virtual ON_Curve::Split

Reimplemented from ON_Curve.

◆ ThisCurveParameter()

double ON_CurveProxy::ThisCurveParameter ( double real_curve_parameter ) const

Parameters

real_curve_parameter [in] m_real_curve parameter

Returns: Corresponding parameter for "this" curve

◆ Transform()

bool ON_CurveProxy::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_CurveProxy::Trim ( const ON_Interval & domain )

overridevirtual

override of virtual ON_Curve::Trim

Reimplemented from ON_Curve.

◆ Write()

bool ON_CurveProxy::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.

Reimplemented in ON_PolyEdgeSegment.

Public Member Functions

Protected Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

◆ ON_CurveProxy() [1/4]

◆ ~ON_CurveProxy()

◆ ON_CurveProxy() [2/4]

◆ ON_CurveProxy() [3/4]

◆ ON_CurveProxy() [4/4]

Member Function Documentation

◆ DataCRC()

◆ Degree()

◆ DestroyRuntimeCache()

◆ Dimension()

◆ Domain()

◆ Dump()

◆ DuplicateCurve()

◆ Evaluate()

◆ GetBBox()

◆ GetCurveParameterFromNurbFormParameter()

◆ GetNextDiscontinuity()

◆ GetNurbForm()

◆ GetNurbFormParameterFromCurveParameter()

◆ GetParameterTolerance()

◆ GetSpanVector()

◆ HasNurbForm()

◆ IsArc()

◆ IsClosed()

◆ IsContinuous()

◆ IsInPlane()

◆ IsLinear()

◆ IsPeriodic()

◆ IsPlanar()

◆ IsPolyline()

◆ IsValid()

◆ operator=()

◆ ProxyCurve()

◆ ProxyCurveDomain()

◆ ProxyCurveIsReversed()

◆ Read()

◆ RealCurveParameter()

◆ Reverse()

◆ SetDomain() [1/2]

◆ SetDomain() [2/2]

◆ SetProxyCurve() [1/2]

◆ SetProxyCurve() [2/2]

◆ SetProxyCurveDomain()

◆ SetProxyCurveIsReversed()

◆ SizeOf()

◆ SpanCount()

◆ Split()

◆ ThisCurveParameter()

◆ Transform()

◆ Trim()

◆ Write()