SplineLengthData Class Reference

#include <c4d_baseobject.h>

Detailed Description

Helper class to obtain the length of splines and the natural position along their path.

Note

Has to be created with Alloc() and destroyed with Free(). Use AutoAlloc to automate the allocation and destruction based on scope.

Public Member Functions
Bool	Init (SplineObject *op, Int32 segment=0, const Vector *padr=nullptr)
Float	UniformToNatural (Float t)
Float	GetLength (void)
Float	GetSegmentLength (Int32 a, Int32 b)

Private Member Functions
	SplineLengthData ()
	~SplineLengthData ()

Alloc/Free
static SplineLengthData *	Alloc ()
static void	Free (SplineLengthData *&bl)

Constructor & Destructor Documentation

SplineLengthData()

SplineLengthData ( )

private

~SplineLengthData()

~SplineLengthData ( )

private

Member Function Documentation

Alloc()

static SplineLengthData* Alloc ( )

static

Allocates a spline length data. Destroy the allocated spline length data with Free(). Use AutoAlloc to automate the allocation and destruction based on scope.

Returns

The allocated spline length data, or nullptr if the allocation failed.

Free()

static void Free ( SplineLengthData *&  bl )

static

Destructs spline length data allocated with Alloc(). Use AutoAlloc to automate the allocation and destruction based on scope.

Parameters

[in,out]

bl

The spline length data to destruct. If the pointer is nullptr nothing happens. The pointer is assigned nullptr afterwards.

Init()

Bool Init	(	SplineObject *	op,
		Int32	segment = 0,
		const Vector *	padr = nullptr
	)

Initializes the spline length data.

Warning

Must be called before using UniformToNatural(), GetLength() and GetSegmentLength.

Note

Cannot be used on spline primitives. Call BaseObject::GetRealSpline() to get a real spline first.

Parameters

[in]	op	The spline object to initialize. The caller owns the pointed spline object.
[in]	segment	The segment to use. Decides what spline segment the calculations in SplineLengthData methods will be performed on.
[in]	padr	For speedup purposes pass a pointer to start of the specified segment in the point array. Otherwise the spline has to search its array manually.

Returns

true if the spline length data was initialized successfully, otherwise false.

UniformToNatural()

Float UniformToNatural

(

Float

t

)

Gets the natural position along the spline, to be used in SplineObject::GetSplinePoint() and SplineObject::GetSplineTangent(), from a uniform position.
The uniform position is with respect to the actual length of the spline, where the natural position only cares about the interpolation of the curve parameter.

Warning

Call Init() before using this method.

Parameters

[in]

t

The uniform position along the spline.

Returns

The natural position in the segment.

GetLength()

Float GetLength

(

void

)

Gets the length of the spline.

Warning

Call Init() before using this method.

Returns

The length of the spline.

GetSegmentLength()

Float GetSegmentLength	(	Int32	a,
		Int32	b
	)

Gets the length of a segment.

Warning

Call Init() before using this method.

Parameters

[in]	a	Start segment.
[in]	b	End segment.

Returns

The segment length.