com.graphbuilder.curve

Class NaturalCubicSpline

java.lang.Object

com.graphbuilder.curve.Curve

com.graphbuilder.curve.ParametricCurve

com.graphbuilder.curve.NaturalCubicSpline

public class NaturalCubicSpline
extends ParametricCurve

The natural-cubic-spline is constructed using piecewise third order polynomials which pass through all the control-points specified by the group-iterator. The curve can be open or closed. Figure 1 shows an open curve and figure 2 shows a closed curve.

Field Summary

Fields

Modifier and Type	Field and Description
private static int	ci
private boolean	closed
private static double[][]	data
private static double[][]	pt

Fields inherited from class com.graphbuilder.curve.Curve

connect, cp, gi

Constructor Summary

Constructors

Constructor and Description
NaturalCubicSpline(ControlPath cp, GroupIterator gi)

Method Summary

Modifier and Type	Method and Description
void	appendTo(MultiPath mp) The requirements for this curve are the group-iterator must be in-range and have a group size of at least 2.
protected void	eval(double[] p) The eval method evaluates a point on a curve given a parametric value "t".
boolean	getClosed() Returns the value of closed.
int	getSampleLimit() Returns a value of 1.
private static void	precalc(int n, int dim, boolean closed)
void	resetMemory() Resets the shared memory to the initial state.
void	setClosed(boolean b) The closed attribute determines which tri-diagonal matrix to solve.

Methods inherited from class com.graphbuilder.curve.Curve

getConnect, getControlPath, getGroupIterator, setConnect, setControlPath, setGroupIterator

Methods inherited from class java.lang.Object

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

Field Detail

pt

private static double[][] pt

data

private static double[][] data

ci

private static int ci

closed

private boolean closed

Constructor Detail

NaturalCubicSpline

public NaturalCubicSpline(ControlPath cp,
                          GroupIterator gi)

Method Detail

eval

protected void eval(double[] p)

Description copied from class: ParametricCurve

The eval method evaluates a point on a curve given a parametric value "t". The parametric value "t" is stored in the last index location of the specified double array. This value should not be changed. The dimension of the point to evaluate is p.length - 1. The result of the evaluation is placed in index locations 0 .. p.length - 2 (inclusive). The eval method should remain protected except for those curves that do no need any preparation to be done in the appendTo method.

Specified by:

eval in class ParametricCurve

precalc

private static void precalc(int n,
                            int dim,
                            boolean closed)

setClosed

public void setClosed(boolean b)

The closed attribute determines which tri-diagonal matrix to solve.

See Also:

getClosed()

getClosed

public boolean getClosed()

Returns the value of closed. The default value is false.

See Also:

setClosed(boolean)

getSampleLimit

public int getSampleLimit()

Returns a value of 1.

Specified by:

getSampleLimit in class ParametricCurve

appendTo

public void appendTo(MultiPath mp)

The requirements for this curve are the group-iterator must be in-range and have a group size of at least 2. If these requirements are not met then this method raises IllegalArgumentException

Specified by:

appendTo in class Curve

See Also:

MultiPath, BinaryCurveApproximationAlgorithm

resetMemory

public void resetMemory()

Description copied from class: Curve

Resets the shared memory to the initial state.

Overrides:

resetMemory in class Curve