IBezPoint3Key Class Reference

#include <istdplug.h>

Class Description

See also

Class IKey, Class Point3.

Description:

This class stores a Bezier Point3 key.

The value of the intan and outtan values of IBezPoint3Key returned from GetKey is actually the tangent of the angle that is spanned between the horizontal axis and the tangent. In order to get the actual handle of the tangent it is important to know that the horizontal (time) distance from the handle to the key value is dependent on the previous (for intan) or next (for outtan) point. The horizontal distance is basically a third of the total distance between the current key and the previous (or next) key :

Control *c = node->GetTMController()->GetPositionController();

dt = (c->GetKeyTime(PreviousIdx)-c->GetKeyTime(CurrentIdx)) / 3.0f;

since the value in IBezPoint3Key pos_key.intan.x is the tan(alpha), you can easily get the vertical location of the handle by calculating :

tan(alpha) = pos_key.intan.x = dy/dt -> dy = pos_key.intan.x * dt

dt is the horizontal coordinate of the tangent handle relative to the key value.

dy is the vertical coordinate of the tangent handle relative to the key value.

Data Members:

Point3 intan;

The incoming tangent vector. This can be thought of as the tangent handle of a 3D spline. The value is relative to val.

Point3 outtan;

The outgoing tangent vector. This can be thought of as the tangent handle of a 3D spline. The value is relative to val.

Point3 val;

The value of the key.

Point3 inLength;

The in length of the horizontal handle.

Point3 outLength;

The out length of the horizontal handle.

Inheritance diagram for IBezPoint3Key:

Public Attributes
Point3	intan
Point3	outtan
Point3	val
Point3	inLength
Point3	outLength
Public Attributes inherited from IKey
TimeValue	time
DWORD	flags

Additional Inherited Members
Public Member Functions inherited from IKey
	IKey ()
Static Public Member Functions inherited from MaxHeapOperators
static UtilExport void *	operator new (size_t size)
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static UtilExport void *	operator new (size_t size, const std::nothrow_t &e)
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static UtilExport void *	operator new (size_t size, const char *filename, int line)
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static UtilExport void *	operator new (size_t size, int block_type, const char *filename, int line)
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static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, const char *filename, int line)
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static UtilExport void *	operator new (size_t size, unsigned long flags)
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static UtilExport void *	operator new (size_t size, const std::nothrow_t &e, unsigned long flags)
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static UtilExport void *	operator new[] (size_t size)
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static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e)
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static UtilExport void *	operator new[] (size_t size, const char *filename, int line)
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static UtilExport void *	operator new[] (size_t size, int block_type, const char *filename, int line)
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static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, const char *filename, int line)
	New operator used to allocate arrays of objects If there is insufficient memory, NULL will be returned. More...
static UtilExport void *	operator new[] (size_t size, unsigned long flags)
	New operator used to allocate arrays of objects If there is insufficient memory, an exception will be thrown. More...
static UtilExport void *	operator new[] (size_t size, const std::nothrow_t &e, unsigned long flags)
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static UtilExport void	operator delete (void *ptr)
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static UtilExport void	operator delete (void *ptr, const char *filename, int line)
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static UtilExport void	operator delete (void *ptr, int block_type, const char *filename, int line)
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static UtilExport void	operator delete (void *ptr, unsigned long flags)
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static UtilExport void	operator delete[] (void *ptr)
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static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e)
	Standard delete operator used to deallocate an array of objects If the pointer is invalid, nothing will happen. More...
static UtilExport void	operator delete[] (void *ptr, const char *filename, int line)
	Delete operator used to deallocate an array of objects that takes the filename and line number where the delete was called If the pointer is invalid, an exception will be thrown. More...
static UtilExport void	operator delete[] (void *ptr, int block_type, const char *filename, int line)
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static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e, const char *filename, int line)
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static UtilExport void	operator delete[] (void *ptr, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...
static UtilExport void	operator delete[] (void *ptr, const std::nothrow_t &e, unsigned long flags)
	Delete operator used to deallocate an array of objects that takes extra flags to specify special operations If the pointer is invalid, an exception will be thrown. More...
static UtilExport void *	operator new (size_t size, void *placement_ptr)
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static UtilExport void	operator delete (void *ptr, void *placement_ptr)
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static UtilExport void *	aligned_malloc (size_t size, size_t alignment)
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static UtilExport void *	aligned_realloc (void *ptr, size_t size, size_t alignment)
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static UtilExport void	aligned_free (void *ptr)
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Member Data Documentation

Point3 intan

Point3 outtan

Point3 val

Point3 inLength

Point3 outLength