Package com.jme3.math

Class Spline

java.lang.Object

com.jme3.math.Spline

All Implemented Interfaces:

Savable

public class Spline
extends Object
implements Savable

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	Spline.SplineType

Constructor Summary

Constructors

Constructor	Description
Spline()
Spline(Spline.SplineType splineType, Vector3f[] controlPoints, float curveTension, boolean cycle)	Create a spline
Spline(Spline.SplineType splineType, List<Vector3f> controlPoints, float curveTension, boolean cycle)	Create a spline
Spline(List<Vector4f> controlPoints, List<Float> nurbKnots)	Create a NURBS spline.

Method Summary

Modifier and Type	Method	Description
void	addControlPoint(Vector3f controlPoint)	Adds a controlPoint to the spline
void	clearControlPoints()
int	getBasisFunctionDegree()	This method returns NURBS' spline basis function degree.
List<Vector3f>	getControlPoints()	returns this spline control points
float	getCurveTension()	returns the curve tension
List<Float>	getKnots()	This method returns NURBS' spline knots.
float	getMaxNurbKnot()	This method returns the maximum nurb curve knot value.
float	getMinNurbKnot()	This method returns the minimum nurb curve knot value.
List<Float>	getSegmentsLength()	returns a list of float representing the segments length
float	getTotalLength()
Spline.SplineType	getType()	return the type of the spline
float[]	getWeights()	This method returns NURBS' spline weights.
Vector3f	interpolate(float value, int currentControlPoint, Vector3f store)	Interpolate a position on the spline
boolean	isCycle()
void	read(JmeImporter im)	De-serialize this spline from the specified importer, for example when loading from a J3O file.
void	removeControlPoint(Vector3f controlPoint)	remove the controlPoint from the spline
void	setCurveTension(float curveTension)	sets the curve tension
void	setCycle(boolean cycle)	set to true to make the spline cycle
void	setType(Spline.SplineType type)	Sets the type of the spline
void	write(JmeExporter ex)	Serialize this spline to the specified exporter, for example when saving to a J3O file.

Methods inherited from class java.lang.Object

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

Constructor Details

Spline

public Spline()

Spline

public Spline(Spline.SplineType splineType,
 Vector3f[] controlPoints,
 float curveTension,
 boolean cycle)

Create a spline

Parameters:

splineType - the type of the spline @see {SplineType}

controlPoints - an array of vector to use as control points of the spline If the type of the curve is Bézier curve the control points should be provided in the appropriate way. Each point 'p' describing control position in the scene should be surrounded by two handler points. This applies to every point except for the border points of the curve, who should have only one handle point. The pattern should be as follows: P0 - H0 : H1 - P1 - H1 : ... : Hn - Pn n is the amount of 'P' - points.

curveTension - the tension of the spline

cycle - true if the spline cycle.

Spline

public Spline(Spline.SplineType splineType,
 List<Vector3f> controlPoints,
 float curveTension,
 boolean cycle)

Create a spline

Parameters:

splineType - the type of the spline @see {SplineType}

controlPoints - a list of vector to use as control points of the spline If the curve is a Bézier curve, the control points should be provided in the appropriate way. Each point 'p' describing control position in the scene should be surrounded by two handler points. This applies to every point except for the border points of the curve, who should have only one handle point. The pattern should be as follows: P0 - H0 : H1 - P1 - H1 : ... : Hn - Pn n is the amount of 'P' - points.

curveTension - the tension of the spline

cycle - true if the spline cycle.

Spline

public Spline(List<Vector4f> controlPoints,
 List<Float> nurbKnots)

Create a NURBS spline. A spline type is automatically set to SplineType.Nurb. The cycle is set to false by default.

Parameters:

controlPoints - a list of vector to use as control points of the spline

nurbKnots - the nurb's spline knots

Method Details

addControlPoint

public void addControlPoint(Vector3f controlPoint)

Adds a controlPoint to the spline

Parameters:

controlPoint - a position in world space

removeControlPoint

public void removeControlPoint(Vector3f controlPoint)

remove the controlPoint from the spline

Parameters:

controlPoint - the controlPoint to remove

clearControlPoints

public void clearControlPoints()

interpolate

public Vector3f interpolate(float value,
 int currentControlPoint,
 Vector3f store)

Interpolate a position on the spline

Parameters:

value - a value from 0 to 1 that represent the position between the current control point and the next one

currentControlPoint - the current control point

store - a vector to store the result (use null to create a new one that will be returned by the method)

Returns:

the position

getCurveTension

public float getCurveTension()

returns the curve tension

Returns:

the value of the tension parameter

setCurveTension

public void setCurveTension(float curveTension)

sets the curve tension

Parameters:

curveTension - the tension

isCycle

public boolean isCycle()

Returns:

true if the spline cycles

setCycle

public void setCycle(boolean cycle)

set to true to make the spline cycle

Parameters:

cycle - true for cyclic, false for acyclic

getTotalLength

public float getTotalLength()

Returns:

the total length of the spline

getType

public Spline.SplineType getType()

return the type of the spline

Returns:

the enum value

setType

public void setType(Spline.SplineType type)

Sets the type of the spline

Parameters:

type - Linear/CatmullRom/Bezier/Nurb

getControlPoints

public List<Vector3f> getControlPoints()

returns this spline control points

Returns:

the pre-existing list

getSegmentsLength

public List<Float> getSegmentsLength()

returns a list of float representing the segments length

Returns:

the pre-existing list

getMinNurbKnot

public float getMinNurbKnot()

This method returns the minimum nurb curve knot value. Check the nurb type before calling this method. If the curve is not of a Nurb type, an NPE will be thrown.

Returns:

the minimum nurb curve knot value

getMaxNurbKnot

public float getMaxNurbKnot()

This method returns the maximum nurb curve knot value. Check the nurb type before calling this method. If the curve is not of a Nurb type, an NPE will be thrown.

Returns:

the maximum nurb curve knot value

getKnots

public List<Float> getKnots()

This method returns NURBS' spline knots.

Returns:

NURBS' spline knots

getWeights

public float[] getWeights()

This method returns NURBS' spline weights.

Returns:

NURBS' spline weights

getBasisFunctionDegree

public int getBasisFunctionDegree()

This method returns NURBS' spline basis function degree.

Returns:

NURBS' spline basis function degree

write

public void write(JmeExporter ex)
           throws IOException

Serialize this spline to the specified exporter, for example when saving to a J3O file.

Specified by:

write in interface Savable

Parameters:

ex - (not null)

Throws:

IOException - from the exporter

read

public void read(JmeImporter im)
          throws IOException

De-serialize this spline from the specified importer, for example when loading from a J3O file.

Specified by:

read in interface Savable

Parameters:

im - (not null)

Throws:

IOException - from the importer