com.itextpdf.text.pdf.parser

Class Matrix

java.lang.Object

com.itextpdf.text.pdf.parser.Matrix

public class Matrix
extends Object

Keeps all the values of a 3 by 3 matrix and allows you to do some math with matrices.

Since:

2.1.4

Field Summary

Fields

Modifier and Type	Field and Description
static int	I11 the row=1, col=1 position ('a') in the matrix.
static int	I12 the row=1, col=2 position ('b') in the matrix.
static int	I13 the row=1, col=3 position (always 0 for 2-D) in the matrix.
static int	I21 the row=2, col=1 position ('c') in the matrix.
static int	I22 the row=2, col=2 position ('d') in the matrix.
static int	I23 the row=2, col=3 position (always 0 for 2-D) in the matrix.
static int	I31 the row=3, col=1 ('e', or X translation) position in the matrix.
static int	I32 the row=3, col=2 ('f', or Y translation) position in the matrix.
static int	I33 the row=3, col=3 position (always 1 for 2-D) in the matrix.

Constructor Summary

Constructors

Constructor and Description
Matrix() constructs a new Matrix with identity.
Matrix(float tx, float ty) Constructs a matrix that represents translation
Matrix(float a, float b, float c, float d, float e, float f) Creates a Matrix with 6 specified entries

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj) Checks equality of matrices.
float	get(int index) Gets a specific value inside the matrix.
float	getDeterminant() Computes the determinant of the matrix.
int	hashCode() Generates a hash code for this object.
Matrix	multiply(Matrix by) multiplies this matrix by 'b' and returns the result See http://en.wikipedia.org/wiki/Matrix_multiplication
Matrix	subtract(Matrix arg) Subtracts a matrix from this matrix and returns the results
String	toString() Generates a String representation of the matrix.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

I11

public static final int I11

the row=1, col=1 position ('a') in the matrix.

See Also:

Constant Field Values

I12

public static final int I12

the row=1, col=2 position ('b') in the matrix.

See Also:

Constant Field Values

I13

public static final int I13

the row=1, col=3 position (always 0 for 2-D) in the matrix.

See Also:

Constant Field Values

I21

public static final int I21

the row=2, col=1 position ('c') in the matrix.

See Also:

Constant Field Values

I22

public static final int I22

the row=2, col=2 position ('d') in the matrix.

See Also:

Constant Field Values

I23

public static final int I23

the row=2, col=3 position (always 0 for 2-D) in the matrix.

See Also:

Constant Field Values

I31

public static final int I31

the row=3, col=1 ('e', or X translation) position in the matrix.

See Also:

Constant Field Values

I32

public static final int I32

the row=3, col=2 ('f', or Y translation) position in the matrix.

See Also:

Constant Field Values

I33

public static final int I33

the row=3, col=3 position (always 1 for 2-D) in the matrix.

See Also:

Constant Field Values

Constructor Detail

Matrix

public Matrix()

constructs a new Matrix with identity.

Matrix

public Matrix(float tx,
              float ty)

Constructs a matrix that represents translation

Parameters:

tx -

ty -

Matrix

public Matrix(float a,
              float b,
              float c,
              float d,
              float e,
              float f)

Creates a Matrix with 6 specified entries

Parameters:

a -

b -

c -

d -

e -

f -

Method Detail

get

public float get(int index)

Gets a specific value inside the matrix.

For reference, the indeces are as follows:

I11 I12 I13

I21 I22 I23

I31 I32 I33

Parameters:

index - an array index corresponding with a value inside the matrix

Returns:

the value at that specific position.

multiply

public Matrix multiply(Matrix by)

multiplies this matrix by 'b' and returns the result See http://en.wikipedia.org/wiki/Matrix_multiplication

Parameters:

by - The matrix to multiply by

Returns:

the resulting matrix

subtract

public Matrix subtract(Matrix arg)

Subtracts a matrix from this matrix and returns the results

Parameters:

arg - the matrix to subtract from this matrix

Returns:

a Matrix object

getDeterminant

public float getDeterminant()

Computes the determinant of the matrix.

Returns:

the determinant of the matrix

Since:

5.0.3

equals

public boolean equals(Object obj)

Checks equality of matrices.

Overrides:

equals in class Object

Parameters:

obj - the other Matrix that needs to be compared with this matrix.

Returns:

true if both matrices are equal

See Also:

Object.equals(java.lang.Object)

hashCode

public int hashCode()

Generates a hash code for this object.

Overrides:

hashCode in class Object

Returns:

the hash code of this object

See Also:

Object.hashCode()

toString

public String toString()

Generates a String representation of the matrix.

Overrides:

toString in class Object

Returns:

the values, delimited with tabs and newlines.

See Also:

Object.toString()