net.aerith.misao.util
Class Quadrics

java.lang.Object
  |
  +--net.aerith.misao.util.Quadrics

public class Quadrics

extends java.lang.Object

The Quadrics represents a quadric function of x and y. It consists of 6 coefficients from A to F which represent:

     z = A + Bx + Cy + Dxx + Exy + Fyy
 

Field Summary

private double	A The constant item.
private double	B The coefficient of x.
private double	C The coefficient of y.
private double	D The coefficient of x^2.
private int	data_count The number of (x,y,z) data to solve the simultaneous equation.
private double	E The coefficient of x y.
private double	F The coefficient of y^2.
private SimultaneousEquation	se The simultaneous equation to solve this quadric function.

Constructor Summary

Quadrics()
Constructs an empty Quadrics.

Method Summary

static Quadrics	create(java.lang.String string) Creates a Quadrics object from the String object which represents the quadric function.
java.lang.String	getOutputString() Returns a string representation of the state of this object.
Position	getPeak() Calculates the peak (x,y).
double	getValue(double x, double y) Gets z value of the specified (x,y).
Quadrics	negative() Creates a negative quadric function of this one.
void	setData(double x, double y, double z) Adds a (x,y,z) data to solve the simultaneous equation.
void	solve() Solves the simultaneous equation and calculates this quadric function in the least square method.

Methods inherited from class java.lang.Object

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

Field Detail

A

private double A

The constant item.

B

private double B

The coefficient of x.

C

private double C

The coefficient of y.

D

private double D

The coefficient of x^2.

E

private double E

The coefficient of x y.

F

private double F

The coefficient of y^2.

se

private SimultaneousEquation se

The simultaneous equation to solve this quadric function.

data_count

private int data_count

The number of (x,y,z) data to solve the simultaneous equation.

Constructor Detail

Quadrics

public Quadrics()

Constructs an empty Quadrics.

Method Detail

getValue

public double getValue(double x,
                       double y)

Gets z value of the specified (x,y).

Parameters:

x - the x value.

y - the y value.

Returns:

z value of the specified (x,y).

setData

public void setData(double x,
                    double y,
                    double z)

Adds a (x,y,z) data to solve the simultaneous equation.

Parameters:

x - the x value.

y - the y value.

z - the z value.

solve

public void solve()

Solves the simultaneous equation and calculates this quadric function in the least square method.

negative

public Quadrics negative()

Creates a negative quadric function of this one.

Returns:

a negative quadric function of this one.

create

public static Quadrics create(java.lang.String string)

Creates a Quadrics object from the String object which represents the quadric function.

Parameters:

string - the string which represents the quadric function.

Returns:

a new Quadrics of the specified string.

getPeak

public Position getPeak()

Calculates the peak (x,y).

Returns:

the peak (x,y).

getOutputString

public java.lang.String getOutputString()

Returns a string representation of the state of this object.

Returns:

a string representation of the state of this object.