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Ogre::SimpleSpline Class Reference

A very simple spline class which implements the Catmull-Rom class of splines. More...

#include <OgreSimpleSpline.h>

List of all members.

Public Methods
	SimpleSpline ()
	~SimpleSpline ()
void	addPoint (const Vector3 &p)
	Adds a control point to the end of the spline. More...
const Vector3 &	getPoint (unsigned short index) const
	Gets the detail of one of the control points of the spline. More...
unsigned short	getNumPoints (void) const
	Gets the number of control points in the spline. More...
void	clear (void)
	Clears all the points in the spline. More...
void	updatePoint (unsigned short index, const Vector3 &value)
	Updates a single point in the spline. More...
Vector3	interpolate (Real t)
	Returns an interpolated point based on a parametric value over the whole series. More...
Vector3	interpolate (unsigned int fromIndex, Real t)
	Interpolates a single segment of the spline given a parametric value. More...
void	setAutoCalculate (bool autoCalc)
	Tells the spline whether it should automatically calculate tangents on demand as points are added. More...
void	recalcTangents (void)
	Recalculates the tangents associated with this spline. More...
Protected Attributes
bool	mAutoCalc
std::vector< Vector3 >	mPoints
std::vector< Vector3 >	mTangents
Matrix4	mCoeffs
	Matrix of coefficients. More...

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Detailed Description

A very simple spline class which implements the Catmull-Rom class of splines.

Remarks:

Splines are bendy lines. You define a series of points, and the spline forms a smoother line between the points to eliminate the sharp angles.

Catmull-Rom splines are a specialisation of the general Hermite spline. With a Hermite spline, you define the start and end point of the line, and 2 tangents, one at the start of the line and one at the end. The Catmull-Rom spline simplifies this by just asking you to define a series of points, and the tangents are created for you.

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Constructor & Destructor Documentation

Ogre::SimpleSpline::SimpleSpline (    )

Ogre::SimpleSpline::~SimpleSpline (    )

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Member Function Documentation

void Ogre::SimpleSpline::addPoint (  const Vector3 &    p )

Adds a control point to the end of the spline.

void Ogre::SimpleSpline::clear (  void    )

Clears all the points in the spline.

unsigned short Ogre::SimpleSpline::getNumPoints (  void    )  const

Gets the number of control points in the spline.

const Vector3 & Ogre::SimpleSpline::getPoint (  unsigned short    index )  const

Gets the detail of one of the control points of the spline.

Vector3 Ogre::SimpleSpline::interpolate (  unsigned int    fromIndex, Real    t )

Interpolates a single segment of the spline given a parametric value. Parameters: fromIndex  The point index to treat as t=0. fromIndex + 1 is deemed to be t=1 t  Parametric value

Vector3 Ogre::SimpleSpline::interpolate (  Real    t )

Returns an interpolated point based on a parametric value over the whole series. Remarks: Given a t value between 0 and 1 representing the parametric distance along the whole length of the spline, this method returns an interpolated point. Parameters: t  Parametric value.

void Ogre::SimpleSpline::recalcTangents (  void    )

Recalculates the tangents associated with this spline. Remarks: If you tell the spline not to update on demand by calling setAutoCalculate(false) then you must call this after completing your updates to the spline points.

void Ogre::SimpleSpline::setAutoCalculate (  bool    autoCalc )

Tells the spline whether it should automatically calculate tangents on demand as points are added. Remarks: The spline calculates tangents at each point automatically based on the input points. Normally it does this every time a point changes. However, if you have a lot of points to add in one go, you probably don't want to incur this overhead and would prefer to defer the calculation until you are finished setting all the points. You can do this by calling this method with a parameter of 'false'. Just remember to manually call the recalcTangents method when you are done. Parameters: autoCalc  If true, tangents are calculated for you whenever a point changes. If false, you must call reclacTangents to recalculate them when it best suits.

void Ogre::SimpleSpline::updatePoint (  unsigned short    index, const Vector3 &    value )

Updates a single point in the spline. Remarks: This point must already exist in the spline.

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Member Data Documentation

bool Ogre::SimpleSpline::mAutoCalc [protected]

Matrix4 Ogre::SimpleSpline::mCoeffs [protected]

Matrix of coefficients.

std::vector<Vector3> Ogre::SimpleSpline::mPoints [protected]

std::vector<Vector3> Ogre::SimpleSpline::mTangents [protected]

Copyright © 2002 by The OGRE Team