ON_CurveKinkDefinition Class Reference

A "kink" in a curve is a unit tangent discontinuity or a vector curvature discontinuity. This class is used to determine which types and magnitudes of unit tangent discontinuities and vector curvature discontinuities should are a "kink." It also provides functions for determining if there is a kink at a specific curve parameter. More...

#include <opennurbs_curve.h>

Public Member Functions
	ON_CurveKinkDefinition ()=default
	ON_CurveKinkDefinition (const ON_CurveKinkDefinition &)=default
	ON_CurveKinkDefinition (double kink_angle_degrees, double curvature_kink_radius_ratio, bool bKinkAtTangentChange, bool bKinkAtCurvatureChange)
	Create a ON_CurveKinkDefinition with specified settings. More...
	~ON_CurveKinkDefinition ()=default
void	Clear ()
	Clear() disables finding kinks. The current values of TangentKinkAngleDegrees(true), TangentKinkAngleDegrees(false), CurvatureKinkAngleDegrees() and CurvatureKinkRadiusRatio() are not changed. More...
void	ClearCurvatureKinkRadiusRatio ()
	Clears any customized the curature kink radius ratio. More...
void	ClearKinkAngle ()
	Clears any customized kink angle. More...
void	ClearKinkAtCurvatureChange ()
	ClearKinkAtCurvatureChange() disables finding kinks at curvature discontinuities. The current values of CurvatureKinkAngleDegrees() and CurvatureKinkRadiusRatio() are not changed. More...
void	ClearKinkAtTangentChange ()
	ClearKinkAtTangentChange() disables finding kinks at tangent discontinuities. The current value of KinkAngleDegrees() is not changed. More...
bool	ComputeCurvatureRadiusRatio (const ON_3dVector &k0, const ON_3dVector &k1, double &curvatureRadiusRatio, double &angleDegrees) const
	Calculates the curvature radius ratio and the angle between the two curvature vectors, as used by IsCurvatureKink(). More...
double	CurvatureKinkRadiusRatio () const
	If the ratio (minimum radius of curvature)/(maximum radius of curvature) at a curvature discontinuity is < CurvatureKinkRadiusRatio(), then that curvature discontinuity is treated as a kink. In particular, if CurvatureKinkRadiusRatio() = 0, then curvature radius discontinuity checks are disabled. More...
double	CurvatureKinkZeroTolerance () const
	If the curvature <= CurvatureKinkZeroTolerance(), then it is treated as flat: its value is treated as CurvatureKinkZeroTolerance() and the direction of the curvature vector is ignored. Put another way, every radius of curvature >= 1/CurvatureKinkZeroTolerance() is treated as 1/CurvatureKinkZeroTolerance(). If CurvatureKinkZeroTolerance() > 0, then the curvature kink test is scale dependent. If CurvatureKinkZeroTolerance() = 0, then the curvature kink test is independent of scale. More...
const ON_SHA1_Hash	Hash () const
	Returns a hash of the settings used to determine if a discontinuity is a kink. This hash is useful for detecting changes in kink settings. If the hashes are equal, then the same kinks will be found. If the hashes are not equal, then curves exist where the different values of ON_CurveKinkDefinition will find different sets of kinks in the same curve. More...
bool	IsCurvatureKink (const ON_Curve &curve, double t) const
bool	IsCurvatureKink (ON_3dVector curvature_from_below, ON_3dVector curvature_from_above) const
	True if the ratio min/max <= CurvatureKinkRadiusRatio(), where min and max are the minimum and maximum lengths of curvature_from_below and curvature_from_above, or if the angle between curvature_from_below and curvature_from_above is > KinkAngleDegrees(). If a curvature vector has length <= CurvatureKinkZeroTolerance(), it is treated as flat: its length is treated as CurvatureKinkZeroTolerance() in the ratio and its direction is ignored, so the angle test is only done when both lengths are > CurvatureKinkZeroTolerance(). Two flat curvatures are never a kink. When CurvatureKinkZeroTolerance() = 0, both tests are scale independent. When CurvatureKinkZeroTolerance() > 0, the test is scale dependent. More...
bool	IsCurvatureZero (const ON_3dVector &K) const
	Returns true if the curvature vector is considered to be zero given the ON_CurveKinkDefinition::CurvatureKinkZeroTolerance More...
bool	IsCurvatureZero (double kappa) const
	Returns true if the curvature value is considerd to be zero given the ON_CurveKinkDefinition::CurvatureKinkZeroTolerance More...
bool	IsKink (const ON_Curve &curve, double t) const
bool	IsSet () const
bool	IsTangentKink (const ON_Curve &curve, double t) const
bool	IsTangentKink (ON_3dVector tangent_from_below, ON_3dVector tangent_from_above) const
bool	IsUnset () const
double	KinkAngleDegrees () const
	The angle, in degrees, used to determine if when an abrupt change in tangent or curvature vector direction is a kink. More...
double	KinkAngleRadians () const
	The angle, in radians, used to determine if when an abrupt change in tangent or curvature vector direction is a kink. More...
bool	KinkAtCurvatureChange () const
bool	KinkAtTangentChange () const
ON_CurveKinkDefinition &	operator= (const ON_CurveKinkDefinition &)=default
bool	Read (class ON_BinaryArchive &)
	Read the settings from a binary More...
void	SetCurvatureKinkRadiusRatio (double curvature_kink_radius_ratio)
void	SetCurvatureKinkZeroTolerance (double curvature_kink_zero_tolerance)
	When CurvatureKinkZeroTolerance() is > 0, IsCurvatureKink() is scale dependent. Otherwise all the tests performed by ON_CurveKinkDefinition are independent of scale. The default value ON_CurveKinkDefinition::DefaultCurvatureKinkZeroTolerance is 0. If you know of a finite radius R that should be considered flat, then calling SetCurvatureKinkZeroTolerance(1.0/R) is a reasonable thing to consider. If you want a "mathematically perfect" scale independent test, then call SetCurvatureKinkZeroTolerance(0) to disable this test that is useful in many typical modeling situations. More...
void	SetKinkAngleDegrees (double kink_angle_degrees)
	The angle, in degrees, used to determine if when an abrupt change in tangent or curvature vector direction is a kink. More...
void	SetKinkAngleRadians (double kink_angle_radians)
	The angle, in radians, used to determine if when an abrupt change in tangent or curvature vector direction is a kink. More...
void	SetKinkAtCurvatureChange (bool bKinkAtCurvatureChange)
void	SetKinkAtTangentChange (bool bKinkAtTangentChange)
const ON_wString	ToString () const
bool	Write (class ON_BinaryArchive &) const
	Save the settings in a binary archive. More...

Static Public Attributes
static const ON_CurveKinkDefinition	DefaultCurvatureKink
	DefaultCurvatureKink = MediumCurvatureKink. More...
static constexpr double	DefaultCurvatureKinkRadiusRatio = 0.75
static constexpr double	DefaultCurvatureKinkZeroTolerance = 0.0
	DefaultCurvatureKinkZeroTolerance is the default value for CurvatureKinkZeroTolerance(). The default can be overridden by calling SetCurvatureKinkZeroTolerance(). If the length of a curvature vector is <= CurvatureKinkZeroTolerance(), then that curvature is treated as flat: its length is treated as CurvatureKinkZeroTolerance() and its direction is ignored. Thus, if CurvatureKinkZeroTolerance() = 0, then the setting does nothing. When CurvatureKinkZeroTolerance() > 0, this is a scale dependent test. The default setting is 0. More...
static constexpr double	DefaultKinkAngleDegrees = 1.0
static constexpr double	DefaultKinkAngleRadians = 1.0 * ON_DEGREES_TO_RADIANS
static const ON_CurveKinkDefinition	DefaultTangentKink
	DefaultTangentKink can be used to detect typical tangent discontinuties. The angles used for testing tangent discontinuities are DefaultPolylineTangentKinkAngleDegrees for polylines and DefaultTangentKinkAngleDegrees for all other curves. More...
static const ON_CurveKinkDefinition	LargeCurvatureKink
	LargeCurvatureKink is used to detect typical unit tangent discontinuties and large vector curvature discontinuties. The angle used for testing tangent discontinuities is DefaultKinkAngleDegrees. The angle used for testing curvature vector direction discontinuties is DefaultKinkAngleDegrees. The ratio used for testing curvature radius discontinuities is LargeCurvatureKinkRadiusRatio. More...
static constexpr double	LargeCurvatureKinkRadiusRatio = 0.5
static const ON_CurveKinkDefinition	MediumCurvatureKink
	MediumCurvatureKink is used to detect typical unit tangent discontinuties and medium vector curvature discontinuties. The angle used for testing tangent discontinuities is DefaultKinkAngleDegrees. The angle used for testing curvature vector direction discontinuties is DefaultKinkAngleDegrees. The ratio used for testing curvature radius discontinuities is MediumCurvatureKinkRadiusRatio. More...
static constexpr double	MediumCurvatureKinkRadiusRatio = 0.75
static const ON_CurveKinkDefinition	SmallCurvatureKink
	SmallCurvatureKink is used to detect typical unit tangent discontinuties and small vector curvature discontinuties. The angle used for testing tangent discontinuities is DefaultKinkAngleDegrees. The angle used for testing curvature vector direction discontinuties is DefaultKinkAngleDegrees. The ratio used for testing curvature radius discontinuities is SmallCurvatureKinkRadiusRatio. More...
static constexpr double	SmallCurvatureKinkRadiusRatio = 0.999
static const ON_CurveKinkDefinition	Unset

Detailed Description

A "kink" in a curve is a unit tangent discontinuity or a vector curvature discontinuity. This class is used to determine which types and magnitudes of unit tangent discontinuities and vector curvature discontinuities should are a "kink." It also provides functions for determining if there is a kink at a specific curve parameter.

Constructor & Destructor Documentation

ON_CurveKinkDefinition() [1/3]

ON_CurveKinkDefinition::ON_CurveKinkDefinition ( )

default

~ON_CurveKinkDefinition()

ON_CurveKinkDefinition::~ON_CurveKinkDefinition ( )

default

ON_CurveKinkDefinition() [2/3]

ON_CurveKinkDefinition::ON_CurveKinkDefinition ( const ON_CurveKinkDefinition &  )

default

ON_CurveKinkDefinition() [3/3]

ON_CurveKinkDefinition::ON_CurveKinkDefinition	(	double	kink_angle_degrees,
		double	curvature_kink_radius_ratio,
		bool	bKinkAtTangentChange,
		bool	bKinkAtCurvatureChange
	)

Create a ON_CurveKinkDefinition with specified settings.

Parameters

kink_angle_degrees	0 <= kink_angle_degrees <= 180. Values > 180 are treated as 180 and other values outside the [0,180] are treated as ON_CurveKinkDefinition::DefaultPolylineTangentKinkAngleDegrees. If a curve is a polyline and the angle (in degrees) between the tangents at a tangent discontinuity is > polyline_tangent_kink_angle_degrees, then that discontinuity is treated as a kink. In particular, passing 180.0 disables tangent discontinuity checks for polyline curves.
curvature_kink_radius_ratio	0 <= curvature_kink_radius_ratio <= 1. Values > 1 are treated as 1 and other values outside the [0,1] are treated as ON_CurveKinkDefinition::DefaultCurvatureKinkRadiusRatio. If the ratio (minimum radius of curvature)/(maximum radius of curvature) at a curvature discontinuity is < curvature_kink_radius_ratio, then that discontinuity is treated as a kink. In particular, passing 0.0 disables curvature radius discontinuity checks.
bKinkAtTangentChange	true if tangent discontinuities should be tested to determine if the tangent discontinuity is a kink. false to ignore tangent discontinuities.
bKinkAtCurvatureChange	true if curvature discontinuities should be tested to determine if the curvature discontinuity is a kink. false to ignore curvature discontinuities.

Member Function Documentation

Clear()

void ON_CurveKinkDefinition::Clear

(

)

Clear() disables finding kinks. The current values of TangentKinkAngleDegrees(true), TangentKinkAngleDegrees(false), CurvatureKinkAngleDegrees() and CurvatureKinkRadiusRatio() are not changed.

ClearCurvatureKinkRadiusRatio()

void ON_CurveKinkDefinition::ClearCurvatureKinkRadiusRatio

(

)

Clears any customized the curature kink radius ratio.

ClearKinkAngle()

void ON_CurveKinkDefinition::ClearKinkAngle

(

)

Clears any customized kink angle.

ClearKinkAtCurvatureChange()

void ON_CurveKinkDefinition::ClearKinkAtCurvatureChange

(

)

ClearKinkAtCurvatureChange() disables finding kinks at curvature discontinuities. The current values of CurvatureKinkAngleDegrees() and CurvatureKinkRadiusRatio() are not changed.

ClearKinkAtTangentChange()

void ON_CurveKinkDefinition::ClearKinkAtTangentChange

(

)

ClearKinkAtTangentChange() disables finding kinks at tangent discontinuities. The current value of KinkAngleDegrees() is not changed.

ComputeCurvatureRadiusRatio()

bool ON_CurveKinkDefinition::ComputeCurvatureRadiusRatio	(	const ON_3dVector &	k0,
		const ON_3dVector &	k1,
		double &	curvatureRadiusRatio,
		double &	angleDegrees
	)		const

Calculates the curvature radius ratio and the angle between the two curvature vectors, as used by IsCurvatureKink().

Parameters

k0
k1
curvatureRadiusRatio	min/max of the lengths of k0 and k1, where a length <= CurvatureKinkZeroTolerance() is treated as CurvatureKinkZeroTolerance(). This is 1 when both lengths are <= CurvatureKinkZeroTolerance().
angleDegrees	The angle between k0 and k1. If one or both lengths are <= CurvatureKinkZeroTolerance(), the direction is ignored and this returns ON_UNSET_VALUE. Returns True if calculation is successful

CurvatureKinkRadiusRatio()

double ON_CurveKinkDefinition::CurvatureKinkRadiusRatio

(

)

const

If the ratio (minimum radius of curvature)/(maximum radius of curvature) at a curvature discontinuity is < CurvatureKinkRadiusRatio(), then that curvature discontinuity is treated as a kink. In particular, if CurvatureKinkRadiusRatio() = 0, then curvature radius discontinuity checks are disabled.

Returns

The ratio used to test for curvature vector kinks.

CurvatureKinkZeroTolerance()

double ON_CurveKinkDefinition::CurvatureKinkZeroTolerance

(

)

const

If the curvature <= CurvatureKinkZeroTolerance(), then it is treated as flat: its value is treated as CurvatureKinkZeroTolerance() and the direction of the curvature vector is ignored. Put another way, every radius of curvature >= 1/CurvatureKinkZeroTolerance() is treated as 1/CurvatureKinkZeroTolerance(). If CurvatureKinkZeroTolerance() > 0, then the curvature kink test is scale dependent. If CurvatureKinkZeroTolerance() = 0, then the curvature kink test is independent of scale.

Returns

Hash()

const ON_SHA1_Hash ON_CurveKinkDefinition::Hash

(

)

const

Returns a hash of the settings used to determine if a discontinuity is a kink. This hash is useful for detecting changes in kink settings. If the hashes are equal, then the same kinks will be found. If the hashes are not equal, then curves exist where the different values of ON_CurveKinkDefinition will find different sets of kinks in the same curve.

Returns

If this is set, a hash of the settings used to find a kink is returned. If this is unset, then ON_SHA1_Hash::EmptyContentHash is returned.

IsCurvatureKink() [1/2]

bool ON_CurveKinkDefinition::IsCurvatureKink	(	const ON_Curve &	curve,
		double	t
	)		const

Returns

True if there is a curvature discontinuity at curve(t) that passes the curvature kink test.

IsCurvatureKink() [2/2]

bool ON_CurveKinkDefinition::IsCurvatureKink	(	ON_3dVector	curvature_from_below,
		ON_3dVector	curvature_from_above
	)		const

True if the ratio min/max <= CurvatureKinkRadiusRatio(), where min and max are the minimum and maximum lengths of curvature_from_below and curvature_from_above, or if the angle between curvature_from_below and curvature_from_above is > KinkAngleDegrees(). If a curvature vector has length <= CurvatureKinkZeroTolerance(), it is treated as flat: its length is treated as CurvatureKinkZeroTolerance() in the ratio and its direction is ignored, so the angle test is only done when both lengths are > CurvatureKinkZeroTolerance(). Two flat curvatures are never a kink. When CurvatureKinkZeroTolerance() = 0, both tests are scale independent. When CurvatureKinkZeroTolerance() > 0, the test is scale dependent.

Returns

Parameters

curvature_from_below
curvature_from_above

Returns

True if either curvature vector is not valid or if, based on the tests described above, they are different enough to be considered a "curvature kink."

IsCurvatureZero() [1/2]

bool ON_CurveKinkDefinition::IsCurvatureZero

(

const ON_3dVector &

K

)

const

Returns true if the curvature vector is considered to be zero given the ON_CurveKinkDefinition::CurvatureKinkZeroTolerance

Parameters

K

Returns

IsCurvatureZero() [2/2]

bool ON_CurveKinkDefinition::IsCurvatureZero

(

double

kappa

)

const

Returns true if the curvature value is considerd to be zero given the ON_CurveKinkDefinition::CurvatureKinkZeroTolerance

Parameters

kappa

Returns

IsKink()

bool ON_CurveKinkDefinition::IsKink	(	const ON_Curve &	curve,
		double	t
	)		const

Returns

True if there is a kink at curve(t).

IsSet()

bool ON_CurveKinkDefinition::IsSet

(

)

const

Returns

True if testing tangent or curvature discontinutities is enabled. False if testing both tangent and curvature discontinuities is disabled.

IsTangentKink() [1/2]

bool ON_CurveKinkDefinition::IsTangentKink	(	const ON_Curve &	curve,
		double	t
	)		const

Returns

True if there is a tangent discontinuity at curve(t) and the agnle between the two tangents is > TangentKinkAngleDegrees(curve.IsPolyline()).

IsTangentKink() [2/2]

bool ON_CurveKinkDefinition::IsTangentKink	(	ON_3dVector	tangent_from_below,
		ON_3dVector	tangent_from_above
	)		const

Returns

True if the angle between tangent_from_below and tangent_from_above is > TangentKinkAngleDegrees(bCurveIsPolyline),

IsUnset()

bool ON_CurveKinkDefinition::IsUnset

(

)

const

Returns

False if testing tangent or curvature discontinutities is enabled. True if testing both tangent and curvature discontinuities is disabled.

KinkAngleDegrees()

double ON_CurveKinkDefinition::KinkAngleDegrees

(

)

const

The angle, in degrees, used to determine if when an abrupt change in tangent or curvature vector direction is a kink.

Returns

The kink angle in degrees.

KinkAngleRadians()

double ON_CurveKinkDefinition::KinkAngleRadians

(

)

const

The angle, in radians, used to determine if when an abrupt change in tangent or curvature vector direction is a kink.

Returns

The tangent kink angle in radians.

KinkAtCurvatureChange()

bool ON_CurveKinkDefinition::KinkAtCurvatureChange

(

)

const

Returns

Returns true if curvature discontinuities should be tested when finding kinks. The angle used vector curvature direction discontinuities is KinkAngleDegrees(). The ratio used for radius of curvature discontinuities is CurvatureKinkRadiusRatio().

KinkAtTangentChange()

bool ON_CurveKinkDefinition::KinkAtTangentChange

(

)

const

Returns

Returns true if tangent discontinuities should be tested when finding kinks. The angle used for testing is KinkAngleDegrees().

operator=()

ON_CurveKinkDefinition& ON_CurveKinkDefinition::operator= ( const ON_CurveKinkDefinition &  )

default

Read()

bool ON_CurveKinkDefinition::Read

(

class ON_BinaryArchive &

)

Read the settings from a binary

Returns

SetCurvatureKinkRadiusRatio()

void ON_CurveKinkDefinition::SetCurvatureKinkRadiusRatio

(

double

curvature_kink_radius_ratio

)

Parameters

curvature_kink_radius_ratio

0 <= curvature_kink_radius_ratio <= 1. Values > 1 are treated as 1 and other values outside the [0,1] are treated as ON_CurveKinkDefinition::DefaultCurvatureKinkRadiusRatio. If the ratio (minimum radius of curvature)/(maximum radius of curvature) at a curvature discontinuity is < curvature_kink_radius_ratio, then that discontinuity is treated as a kink. In particular, passing 0.0 disables curvature radius discontinuity checks.

SetCurvatureKinkZeroTolerance()

void ON_CurveKinkDefinition::SetCurvatureKinkZeroTolerance

(

double

curvature_kink_zero_tolerance

)

When CurvatureKinkZeroTolerance() is > 0, IsCurvatureKink() is scale dependent. Otherwise all the tests performed by ON_CurveKinkDefinition are independent of scale. The default value ON_CurveKinkDefinition::DefaultCurvatureKinkZeroTolerance is 0. If you know of a finite radius R that should be considered flat, then calling SetCurvatureKinkZeroTolerance(1.0/R) is a reasonable thing to consider. If you want a "mathematically perfect" scale independent test, then call SetCurvatureKinkZeroTolerance(0) to disable this test that is useful in many typical modeling situations.

Parameters

curvature_zero_tolerance

0 <= curvature_zero_tolerance Negative and non-finite values are treated as ON_CurveKinkDefinition::DefaultCurvatureKinkZeroTolerance. If the length of a curvature vector is <= curvature_zero_tolerance, then that curvature is treated as flat: its length is treated as curvature_zero_tolerance and its direction is ignored. In particular, passing 0.0 disables curvature zero tolerance checks.

SetKinkAngleDegrees()

void ON_CurveKinkDefinition::SetKinkAngleDegrees

(

double

kink_angle_degrees

)

The angle, in degrees, used to determine if when an abrupt change in tangent or curvature vector direction is a kink.

Parameters

kink_angle_degrees

0 <= kink_angle_degrees <= 180. Values > 180 are treated as 180 and other values outside the [0,180] are treated as ON_CurveKinkDefinition::DefaultKinkAngleDegrees.

SetKinkAngleRadians()

void ON_CurveKinkDefinition::SetKinkAngleRadians

(

double

kink_angle_radians

)

The angle, in radians, used to determine if when an abrupt change in tangent or curvature vector direction is a kink.

Parameters

kink_angle_radians

0 <= kink_angle_radians <= 180. Values > 180 are treated as 180 and other values outside the [0,180] are treated as ON_CurveKinkDefinition::DefaultKinkAngleRadians.

SetKinkAtCurvatureChange()

void ON_CurveKinkDefinition::SetKinkAtCurvatureChange

(

bool

bKinkAtCurvatureChange

)

Parameters

bKinkAtTangentChange

If true, finding kinks at curvature discontinuities is enabled. If the curvature parameters are not set, then ON_CurveKinkDefinition::DefaulteKinkAngleDegrees and ON_CurveKinkDefinition::DefaultCurvatureKinkRadiusRatio are used. If false, then curvature discontinuities are ignored when finding kinks. The current values of CurvatureKinkAngleDegrees() and CurvatureKinkRadiusRatio() are not changed.

SetKinkAtTangentChange()

void ON_CurveKinkDefinition::SetKinkAtTangentChange

(

bool

bKinkAtTangentChange

)

Parameters

bKinkAtTangentChange

If true, finding kinks at tangent discontinuities is enabled. If the kink angles are not set, then ON_CurveKinkDefinition::DefaultKinkAngleDegrees is used. If false, then tangent discontinuities are ignored when finding kinks. The current value of KinkAngleDegrees() is not changed.

ToString()

const ON_wString ON_CurveKinkDefinition::ToString

(

)

const

Returns

A text description of the ON_CurveKinkDefinition settings.

Write()

bool ON_CurveKinkDefinition::Write

(

class ON_BinaryArchive &

)

const

Save the settings in a binary archive.

Returns

Member Data Documentation

DefaultCurvatureKink

const ON_CurveKinkDefinition ON_CurveKinkDefinition::DefaultCurvatureKink

static

DefaultCurvatureKink = MediumCurvatureKink.

DefaultCurvatureKinkRadiusRatio

constexpr double ON_CurveKinkDefinition::DefaultCurvatureKinkRadiusRatio = 0.75

staticconstexpr

DefaultCurvatureKinkZeroTolerance

constexpr double ON_CurveKinkDefinition::DefaultCurvatureKinkZeroTolerance = 0.0

staticconstexpr

DefaultCurvatureKinkZeroTolerance is the default value for CurvatureKinkZeroTolerance(). The default can be overridden by calling SetCurvatureKinkZeroTolerance(). If the length of a curvature vector is <= CurvatureKinkZeroTolerance(), then that curvature is treated as flat: its length is treated as CurvatureKinkZeroTolerance() and its direction is ignored. Thus, if CurvatureKinkZeroTolerance() = 0, then the setting does nothing. When CurvatureKinkZeroTolerance() > 0, this is a scale dependent test. The default setting is 0.

1e-8;

DefaultKinkAngleDegrees

constexpr double ON_CurveKinkDefinition::DefaultKinkAngleDegrees = 1.0

staticconstexpr

DefaultKinkAngleRadians

constexpr double ON_CurveKinkDefinition::DefaultKinkAngleRadians = 1.0 * ON_DEGREES_TO_RADIANS

staticconstexpr

DefaultTangentKink

const ON_CurveKinkDefinition ON_CurveKinkDefinition::DefaultTangentKink

static

DefaultTangentKink can be used to detect typical tangent discontinuties. The angles used for testing tangent discontinuities are DefaultPolylineTangentKinkAngleDegrees for polylines and DefaultTangentKinkAngleDegrees for all other curves.

LargeCurvatureKink

const ON_CurveKinkDefinition ON_CurveKinkDefinition::LargeCurvatureKink

static

LargeCurvatureKink is used to detect typical unit tangent discontinuties and large vector curvature discontinuties. The angle used for testing tangent discontinuities is DefaultKinkAngleDegrees. The angle used for testing curvature vector direction discontinuties is DefaultKinkAngleDegrees. The ratio used for testing curvature radius discontinuities is LargeCurvatureKinkRadiusRatio.

LargeCurvatureKinkRadiusRatio

constexpr double ON_CurveKinkDefinition::LargeCurvatureKinkRadiusRatio = 0.5

staticconstexpr

MediumCurvatureKink

const ON_CurveKinkDefinition ON_CurveKinkDefinition::MediumCurvatureKink

static

MediumCurvatureKink is used to detect typical unit tangent discontinuties and medium vector curvature discontinuties. The angle used for testing tangent discontinuities is DefaultKinkAngleDegrees. The angle used for testing curvature vector direction discontinuties is DefaultKinkAngleDegrees. The ratio used for testing curvature radius discontinuities is MediumCurvatureKinkRadiusRatio.

MediumCurvatureKinkRadiusRatio

constexpr double ON_CurveKinkDefinition::MediumCurvatureKinkRadiusRatio = 0.75

staticconstexpr

SmallCurvatureKink

const ON_CurveKinkDefinition ON_CurveKinkDefinition::SmallCurvatureKink

static

SmallCurvatureKink is used to detect typical unit tangent discontinuties and small vector curvature discontinuties. The angle used for testing tangent discontinuities is DefaultKinkAngleDegrees. The angle used for testing curvature vector direction discontinuties is DefaultKinkAngleDegrees. The ratio used for testing curvature radius discontinuities is SmallCurvatureKinkRadiusRatio.

SmallCurvatureKinkRadiusRatio

constexpr double ON_CurveKinkDefinition::SmallCurvatureKinkRadiusRatio = 0.999

staticconstexpr

Unset

const ON_CurveKinkDefinition ON_CurveKinkDefinition::Unset

static