javax.media.ding3d.utils.behaviors.interpolators
Class KBCubicSplineSegment

java.lang.Object
  javax.media.ding3d.utils.behaviors.interpolators.KBCubicSplineSegment

public class KBCubicSplineSegment
extends java.lang.Object

The KBCubicSplineSegment class creates the representation of a Kochanek-Bartel's (also known as the TCB or Tension-Continuity-Bias Spline. This class takes 4 key frames as its input (using KBKeyFrame). If interpolating between the i^th and (i+1)^th key frame then the four key frames that need to be specified are the (i-1)^th, i^th, (i+1)^th and (i+2)^th keyframes in order. The KBCubicSegmentClass then pre-computes the hermite interpolation basis coefficients if the (i+1)^th frame has the linear flag set to zero. These are used to calculate the interpolated position, scale and quaternions when they requested by the user using the getInterpolated* methods. If the the (i+1)^th frame's linear flag is set to 1 then the class uses linear interpolation to calculate the interpolated position, scale, heading pitch and bank it returns through the getInterpolated* methods.

Since:

Java3D 1.2

Method Summary

float	computeLength(float u) Computes the length of the curve at a given point between key frames.
float	getInterpolatedBank(float u) Computes the interpolated bank along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.
float	getInterpolatedHeading(float u) Computes the interpolated heading along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.
float	getInterpolatedPitch(float u) Computes the interpolated pitch along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)th key frame's linear value is equal to 1.
void	getInterpolatedPosition(float u, Point3f newPos) Computes the interpolated position along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components.
void	getInterpolatedPositionVector(float u, Vector3f newPos) Computes the interpolated position along the curve at a given point between key frames and returns a Vector3f with the interpolated x, y, and z scale components.
void	getInterpolatedScale(float u, Point3f newScale) Computes the interpolated scale along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components.
float	getInterpolatedValue(float u) Computes the ratio of the length of the spline from the ith key frame to the position specified by u to the length of the entire spline segment from the ith key frame to the (i+1) th key frame.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

computeLength

public float computeLength(float u)

Computes the length of the curve at a given point between key frames.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

getInterpolatedScale

public void getInterpolatedScale(float u,
                                 Point3f newScale)

Computes the interpolated scale along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components. This routine uses linear interpolation if the (i+1)^th key frame's linear value is equal to 1.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

newScale - returns the interpolated x,y,z scale value in a Point3f

getInterpolatedPosition

public void getInterpolatedPosition(float u,
                                    Point3f newPos)

Computes the interpolated position along the curve at a given point between key frames and returns a Point3f with the interpolated x, y, and z scale components. This routine uses linear interpolation if the (i+1)^th key frame's linear value is equal to 1.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

newPos - returns the interpolated x,y,z position in a Point3f

getInterpolatedPositionVector

public void getInterpolatedPositionVector(float u,
                                          Vector3f newPos)

Computes the interpolated position along the curve at a given point between key frames and returns a Vector3f with the interpolated x, y, and z scale components. This routine uses linear interpolation if the (i+1)^th key frame's linear value is equal to 1.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

newPos - returns the interpolated x,y,z position in a Vector3f.

getInterpolatedHeading

public float getInterpolatedHeading(float u)

Computes the interpolated heading along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)^th key frame's linear value is equal to 1.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

Returns:

returns the interpolated heading value

getInterpolatedPitch

public float getInterpolatedPitch(float u)

Computes the interpolated pitch along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)^th key frame's linear value is equal to 1.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

Returns:

returns the interpolated pitch value

getInterpolatedBank

public float getInterpolatedBank(float u)

Computes the interpolated bank along the curve at a given point between key frames and returns the interpolated value as a float This routine uses linear interpolation if the (i+1)^th key frame's linear value is equal to 1.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

Returns:

returns the interpolated bank value

getInterpolatedValue

public float getInterpolatedValue(float u)

Computes the ratio of the length of the spline from the i^th key frame to the position specified by u to the length of the entire spline segment from the i^th key frame to the (i+1) ^th key frame. When the (i+1)^th key frame's linear value is equal to 1, this is meaninful otherwise it should return u.

Parameters:

u - specifies the point between keyframes where 0 <= u <= 1.

Returns:

the interpolated ratio