ej.microvg

Class MatrixHelper

java.lang.Object

ej.microvg.MatrixHelper

public class MatrixHelper
extends java.lang.Object

This class offers matrix services.

Method Summary

Modifier and Type	Method and Description
static void	concatenate(float[] matrix, float[] other) Preconcats the matrix with the specified matrix.
static void	copy(float[] dest, float[] src) Deep copies the given matrix into destination.
static float[]	create() Creates a matrix.
static float[]	create(float[] matrix) Creates a copy of the matrix.
static float[]	create(float x, float y) Creates an identity matrix translated to (x,y).
static float[]	createIdentity() Creates an identity matrix.
static java.awt.geom.AffineTransform	getAffineTransform(float[] matrix, float tx, float ty) Gets the affine transform for the initial x, y translation and concatenate with the given matrix.
static void	identity(float[] matrix) Updates the matrix as identity matrix.
static void	reset(float[] matrix, float x, float y) Resets the matrix as identity matrix and translates it.
static void	rotate(float[] matrix, float degrees) Preconcats the matrix with the specified rotation.
static void	scale(float[] matrix, float scaleX, float scaleY) Preconcats the matrix with the specified scale.
static void	translate(float[] matrix, float x, float y) Preconcats the matrix with the specified translation.

Methods inherited from class java.lang.Object

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

Method Detail

create

public static float[] create()

Creates a matrix.

Returns:

the new matrix

createIdentity

public static float[] createIdentity()

Creates an identity matrix.

Returns:

the new matrix

create

public static float[] create(float x,
                             float y)

Creates an identity matrix translated to (x,y).

Parameters:

x - the translation on x

y - the translation on y

Returns:

the new matrix

create

public static float[] create(float[] matrix)

Creates a copy of the matrix.

Parameters:

matrix - the matrix to copy

Returns:

the new matrix

identity

public static void identity(float[] matrix)

Updates the matrix as identity matrix.

Parameters:

matrix - the matrix to initialize

reset

public static void reset(float[] matrix,
                         float x,
                         float y)

Resets the matrix as identity matrix and translates it.

Parameters:

matrix - the matrix to initialize

x - the translation on x

y - the translation on y

copy

public static void copy(float[] dest,
                        float[] src)

Deep copies the given matrix into destination.

Parameters:

dest - the matrix to copy to

src - the matrix to copy from

translate

public static void translate(float[] matrix,
                             float x,
                             float y)

Preconcats the matrix with the specified translation. M' = M * T(dx, dy)

Parameters:

matrix - the matrix to translate

x - the translation on x

y - the translation on y

scale

public static void scale(float[] matrix,
                         float scaleX,
                         float scaleY)

Preconcats the matrix with the specified scale. M' = M * S(sx, sy)

Parameters:

matrix - the matrix to scale

scaleX - the scale on x

scaleY - the scale on y

rotate

public static void rotate(float[] matrix,
                          float degrees)

Preconcats the matrix with the specified rotation. M' = M * R(degrees)

Parameters:

matrix - the matrix to rotate

degrees - the degrees to rotate

concatenate

public static void concatenate(float[] matrix,
                               float[] other)

Preconcats the matrix with the specified matrix. M' = M * other

Parameters:

matrix - the matrix to concat

other - the matrix to concat with

getAffineTransform

public static java.awt.geom.AffineTransform getAffineTransform(float[] matrix,
                                                               float tx,
                                                               float ty)

Gets the affine transform for the initial x, y translation and concatenate with the given matrix.

Parameters:

matrix - the matrix handle

tx - the translation x

ty - the translation y

Returns:

the affine transformation