triptracker.client.map.core
Class SimpleMatrixOps

java.lang.Object
  triptracker.client.map.core.SimpleMatrixOps

public class SimpleMatrixOps
extends Object

Field Summary

static double[][]	flip3x3 Flip matrix.
static double[][]	identity3x3 3x3 identity matrix.
static double[][]	mirror3x3 Mirror matrix.
static double[][]	rotate180d3x3 180 degrees rotation matrix.
static double[][]	rotate270d3x3 270 degrees (anti-clockwise?) rotation matrix
static double[][][]	rotate3x3 All rotation matrices.
static double[][]	rotate90d3x3 90 degrees (anti-clockwise?) rotation matrix.
static double[][][]	scale3x3 Both scaling matrices.
static double[][]	scalex3x3 X-axis scaling matrix.
static double[][]	scaley3x3 Y-axis scaling matrix.
static double[][][]	translate3x3 Both translation matrices.
static double[][]	translatex3x3 X-axis translation matrix.
static double[][]	translatey3x3 Y-axis translation matrix.

Constructor Summary

SimpleMatrixOps()

Method Summary

static double[][]	add(double[][]... matrices) Perform a matrix addition operation on an abitrary number of matrices.
static Matrix2D<? extends Number>	add(Matrix2D<? extends Number>... matrices)
static boolean[][]	expandToSquare(boolean[][] layout) Expand a matrix until it becomes square.
static Matrix2D<Number>	expandToSquares(Matrix2D<Number> mat, Number defaultValue)
static boolean[][]	minimize(boolean[][] layout) Minimize the matrix by removing rows and columns from either of the four sides where all the elements are false.
static double[][]	multiply(double[][] mat1, double[][] mat2) Perform a matrix multiplication operation.
static double[][]	multiply(double factor, double[][] matrix) Multiply a matrix by a factor.

Methods inherited from class java.lang.Object

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

Field Detail

identity3x3

public static final double[][] identity3x3

3x3 identity matrix.

rotate90d3x3

public static final double[][] rotate90d3x3

90 degrees (anti-clockwise?) rotation matrix.

rotate180d3x3

public static final double[][] rotate180d3x3

180 degrees rotation matrix.

rotate270d3x3

public static final double[][] rotate270d3x3

270 degrees (anti-clockwise?) rotation matrix

scalex3x3

public static final double[][] scalex3x3

X-axis scaling matrix.

scaley3x3

public static final double[][] scaley3x3

Y-axis scaling matrix.

translatex3x3

public static final double[][] translatex3x3

X-axis translation matrix.

translatey3x3

public static final double[][] translatey3x3

Y-axis translation matrix.

flip3x3

public static final double[][] flip3x3

Flip matrix. Scale -1 about the y-axis (invert all x values)

mirror3x3

public static final double[][] mirror3x3

Mirror matrix. Scale -1 about the x-axis (invert all y values)

rotate3x3

public static final double[][][] rotate3x3

All rotation matrices.

scale3x3

public static final double[][][] scale3x3

Both scaling matrices.

translate3x3

public static final double[][][] translate3x3

Both translation matrices.

Constructor Detail

SimpleMatrixOps

public SimpleMatrixOps()

Method Detail

multiply

public static double[][] multiply(double[][] mat1,
                                  double[][] mat2)

Perform a matrix multiplication operation. In matrix multiplication the order of the matrices is essential to the final result.

Parameters:

mat1 - the first matrix

mat2 - the second matrix

Returns:

resulting multiplied matrix

Throws:

IllegalArgumentException - if not all matrices are the same size

multiply

public static double[][] multiply(double factor,
                                  double[][] matrix)

Multiply a matrix by a factor.

Parameters:

factor -

matrix -

Returns:

matrix with elements multiplied by the factor

add

public static double[][] add(double[][]... matrices)

Perform a matrix addition operation on an abitrary number of matrices.

Parameters:

matrices - matrices to perform the addition operation on

Returns:

matrix with all the elements added

Throws:

IllegalArgumentException - if matrix dimensions are incompatible

add

public static Matrix2D<? extends Number> add(Matrix2D<? extends Number>... matrices)

expandToSquare

public static boolean[][] expandToSquare(boolean[][] layout)

Expand a matrix until it becomes square. The extra rows or columns added, to give the matrix an equal amount of rows and columns, will be filled with the value false.

Parameters:

layout - matrix

Returns:

squared matrix

expandToSquares

public static Matrix2D<Number> expandToSquares(Matrix2D<Number> mat,
                                               Number defaultValue)

minimize

public static boolean[][] minimize(boolean[][] layout)

Minimize the matrix by removing rows and columns from either of the four sides where all the elements are false.