com.kheops.jmap.client.graphics2D

Class K2DMatrix

java.lang.Object

com.kheops.jmap.client.graphics2D.K2DMatrix

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class K2DMatrix
extends java.lang.Object
implements java.io.Serializable, java.lang.Cloneable

A low level class representing a 2D geometric affine transformation matrix.

See Also:

K2DTransform, Serializable, Serialized Form

Constructor Summary

Constructors

Constructor and Description
K2DMatrix() This constructor builds an 3 by 3 identity matrix
K2DMatrix(double e00, double e01, double e02, double e10, double e11, double e12, double e20, double e21, double e22) Constructs a 3 by 3 matrix with the specified values at the specified positions in the matrix
K2DMatrix(K2DMatrix mat) This constructor builds a matrix having the same values as the parameter matrix.

Method Summary

Modifier and Type	Method and Description
void	applyIdentity() Sets the matrix to the identity matrix.
void	applyInverse() This method inverses the matrix.
void	applyTranspose() This method applies the tranpose of the matrix meaning Eij = Eji where Eij is the element of the matrix on the ith row and jth column
java.lang.Object	clone() Clones this K2DMatrix instance.
boolean	equals(java.lang.Object obj)
double	getDeterminant() This method calculates the determinant of the matrix.
K2DMatrix	getInverse() This method get the inverse of the matrix.
double	getMatrixElement(int row, int col) Gets the value at the specified position in the matrix.
void	multiply(K2DMatrix m) Multiply this matrix with matrix m.
java.lang.String	toString()

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

K2DMatrix

public K2DMatrix()

This constructor builds an 3 by 3 identity matrix

K2DMatrix

public K2DMatrix(double e00,
                 double e01,
                 double e02,
                 double e10,
                 double e11,
                 double e12,
                 double e20,
                 double e21,
                 double e22)

Constructs a 3 by 3 matrix with the specified values at the specified positions in the matrix

Parameters:

e00 - value for position 0,0

e01 - value for position 0,1

e02 - value for position 0,2

e10 - value for position 1,0

e11 - value for position 1,1

e12 - value for position 1,2

e20 - value for position 2,0

e21 - value for position 2,1

e22 - value for position 2,2

K2DMatrix

public K2DMatrix(K2DMatrix mat)

This constructor builds a matrix having the same values as the parameter matrix.

Parameters:

mat - the original matrix to copy

Method Detail

applyIdentity

public void applyIdentity()

Sets the matrix to the identity matrix.

getDeterminant

public double getDeterminant()

This method calculates the determinant of the matrix.

Returns:

the value of the determinant

applyTranspose

public void applyTranspose()

This method applies the tranpose of the matrix meaning Eij = Eji where Eij is the element of the matrix on the ith row and jth column

applyInverse

public void applyInverse()

This method inverses the matrix.

getInverse

public K2DMatrix getInverse()

This method get the inverse of the matrix.

Returns:

a K2DMatrix that is the inverse of the matrix

multiply

public void multiply(K2DMatrix m)

Multiply this matrix with matrix m. The order of the operation is important. This K2DMatrix instance calling this method will be set to result of the multiplication.

Parameters:

m - to matrix that will be multiplied

clone

public java.lang.Object clone()

Clones this K2DMatrix instance.

Overrides:

clone in class java.lang.Object

Returns:

a copy of this K2DMatrix instance.

getMatrixElement

public double getMatrixElement(int row,
                               int col)

Gets the value at the specified position in the matrix.

Parameters:

row - the row position in the matrix

col - the col position in the matrix

Returns:

the value at the position or 0 if the position doesn't exist

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object