jpview.graphics
Class GraphicsGems

java.lang.Object
  jpview.graphics.GraphicsGems

public class GraphicsGems
extends java.lang.Object

Adopted from GraphicsGems root finders

Author:

Jochen Schwarze (schwarze@isa.de), adpated by cliff lyon

Field Summary

static double

EQN_EPS epsilon value

Constructor Summary

GraphicsGems()
Creates a new instance of GraphicsGems

Method Summary

static double	cbrt(double x) Returns the cube root
static boolean	IsZero(double x) true if x is zero w/in tolerance
static int	SolveCubic(double[] c, double[] s) Solve a cubic equation
static int	SolveQuadric(double[] c, double[] s) Solves a quadric equation
static int	SolveQuadric(double[] c, double[] s, int n) Solve a quadric equation
static int	SolveQuartic(double[] c, double[] s) Solves a quartic equation

Methods inherited from class java.lang.Object

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

Field Detail

EQN_EPS

public static final double EQN_EPS

epsilon value

See Also:

Constant Field Values

Constructor Detail

GraphicsGems

public GraphicsGems()

Creates a new instance of GraphicsGems

Method Detail

IsZero

public static boolean IsZero(double x)

true if x is zero w/in tolerance

Parameters:

x - value to test

Returns:

true if this value is zero

cbrt

public static double cbrt(double x)

Returns the cube root

Parameters:

x - the input value

Returns:

the cube root of the input

SolveQuadric

public static int SolveQuadric(double[] c,
                               double[] s)

Solves a quadric equation

Parameters:

c - The coefficients for the equation

s - Storage for the roots of the equation

Returns:

the number of roots in the equation

SolveQuadric

public static int SolveQuadric(double[] c,
                               double[] s,
                               int n)

Solve a quadric equation

Parameters:

c - coefficient array for the quadric

s - storage for the roots of the equation

n - offset into the result array, if non-zero

Returns:

the number of roots of the equation

SolveCubic

public static int SolveCubic(double[] c,
                             double[] s)

Solve a cubic equation

Parameters:

c - array of coefficients

s - storage for the results

Returns:

the number of roots in the equation

SolveQuartic

public static int SolveQuartic(double[] c,
                               double[] s)

Solves a quartic equation

Parameters:

c - array containing the coefficients of the equation

s - storage for results

Returns:

the number of roots of the equation