public class Mat22

Object
Mat22

A 2-by-2 matrix. Stored in column-major order.

Fields

`public final` `Vec2 ex`
`public final` `Vec2 ey`

Constructors

`public Mat22()`	Construct zero matrix.
`public Mat22(Vec2 c1, Vec2 c2)`	Create a matrix with given vectors as columns.
`public Mat22(float exx, float col2x, float exy, float col2y)`	Create a matrix from four floats.

Methods

`public` `String toString()`	Convert the matrix to printable format.
`public final` `Mat22 set(Mat22 m)`	Set as a copy of another matrix.
`public final` `Mat22 set(float exx, float col2x, float exy, float col2y)`
`public final` `Mat22 clone()`	Return a clone of this matrix.
`public final void set(float angle)`	Set as a matrix representing a rotation.
`public final void setIdentity()`	Set as the identity matrix.
`public final void setZero()`	Set as the zero matrix.
`public final float getAngle()`	Extract the angle from this matrix (assumed to be a rotation matrix).
`public final void set(Vec2 c1, Vec2 c2)`	Set by column vectors.
`public final` `Mat22 invert()`	Returns the inverted Mat22 - does NOT invert the matrix locally!
`public final` `Mat22 invertLocal()`
`public final void invertToOut(Mat22 out)`
`public final` `Mat22 abs()`	Return the matrix composed of the absolute values of all elements.
`public final void absLocal()`
`public static final` `Mat22 abs(Mat22 R)`	Return the matrix composed of the absolute values of all elements.
`public static void absToOut(Mat22 R, Mat22 out)`
`public final` `Vec2 mul(Vec2 v)`	Multiply a vector by this matrix.
`public final void mulToOut(Vec2 v, Vec2 out)`
`public final void mulToOutUnsafe(Vec2 v, Vec2 out)`
`public final` `Mat22 mul(Mat22 R)`	Multiply another matrix by this one (this one on left).
`public final` `Mat22 mulLocal(Mat22 R)`
`public final void mulToOut(Mat22 R, Mat22 out)`
`public final void mulToOutUnsafe(Mat22 R, Mat22 out)`
`public final` `Mat22 mulTrans(Mat22 B)`	Multiply another matrix by the transpose of this one (transpose of this one on left).
`public final` `Mat22 mulTransLocal(Mat22 B)`
`public final void mulTransToOut(Mat22 B, Mat22 out)`
`public final void mulTransToOutUnsafe(Mat22 B, Mat22 out)`
`public final` `Vec2 mulTrans(Vec2 v)`	Multiply a vector by the transpose of this matrix.
`public final void mulTransToOut(Vec2 v, Vec2 out)`
`public final` `Mat22 add(Mat22 B)`	Add this matrix to B, return the result.
`public final` `Mat22 addLocal(Mat22 B)`	Add B to this matrix locally.
`public final` `Vec2 solve(Vec2 b)`	Solve A * x = b where A = this matrix.
`public final void solveToOut(Vec2 b, Vec2 out)`
`public static final` `Vec2 mul(Mat22 R, Vec2 v)`
`public static final void mulToOut(Mat22 R, Vec2 v, Vec2 out)`
`public static final void mulToOutUnsafe(Mat22 R, Vec2 v, Vec2 out)`
`public static final` `Mat22 mul(Mat22 A, Mat22 B)`
`public static final void mulToOut(Mat22 A, Mat22 B, Mat22 out)`
`public static final void mulToOutUnsafe(Mat22 A, Mat22 B, Mat22 out)`
`public static final` `Vec2 mulTrans(Mat22 R, Vec2 v)`
`public static final void mulTransToOut(Mat22 R, Vec2 v, Vec2 out)`
`public static final void mulTransToOutUnsafe(Mat22 R, Vec2 v, Vec2 out)`
`public static final` `Mat22 mulTrans(Mat22 A, Mat22 B)`
`public static final void mulTransToOut(Mat22 A, Mat22 B, Mat22 out)`
`public static final void mulTransToOutUnsafe(Mat22 A, Mat22 B, Mat22 out)`
`public static final` `Mat22 createRotationalTransform(float angle)`
`public static final void createRotationalTransform(float angle,` `Mat22 out)`
`public static final` `Mat22 createScaleTransform(float scale)`
`public static final void createScaleTransform(float scale,` `Mat22 out)`
`public int hashCode()`	Returns a hash code value for the object.
`public boolean equals(Object obj)`	Indicates whether some other object is “equal to” this one.

Inherited methods

From Object

getClass, notify, notifyAll, wait, wait, wait

Field details

ex

public final Vec2 ex

ey

public final Vec2 ey

Constructor details

Mat22

public Mat22()

Construct zero matrix. Note: this is NOT an identity matrix! djm fixed double allocation problem

Mat22

public Mat22(Vec2 c1, Vec2 c2)

Create a matrix with given vectors as columns.

Parameters

c1 Vec2: Column 1 of matrix
c2 Vec2: Column 2 of matrix

Mat22

public Mat22(float exx, float col2x, float exy, float col2y)

Create a matrix from four floats.

Method details

toString

public String toString()

Convert the matrix to printable format.

set

public final Mat22 set(Mat22 m)

Set as a copy of another matrix.

Parameters

m Mat22: Matrix to copy

set

public final Mat22 set(float exx, float col2x, float exy, float col2y)

clone

public final Mat22 clone()

Return a clone of this matrix. djm fixed double allocation

set

public final void set(float angle)

Set as a matrix representing a rotation.

Parameters

angle float: Rotation (in radians) that matrix represents.

setIdentity

public final void setIdentity()

Set as the identity matrix.

setZero

public final void setZero()

Set as the zero matrix.

getAngle

public final float getAngle()

Extract the angle from this matrix (assumed to be a rotation matrix).

set

public final void set(Vec2 c1, Vec2 c2)

Set by column vectors.

Parameters

c1 Vec2: Column 1
c2 Vec2: Column 2

invert

public final Mat22 invert()

Returns the inverted Mat22 - does NOT invert the matrix locally!

invertLocal

public final Mat22 invertLocal()

invertToOut

public final void invertToOut(Mat22 out)

abs

public final Mat22 abs()

Return the matrix composed of the absolute values of all elements. djm: fixed double allocation

Returns

Absolute value matrix

absLocal

public final void absLocal()

abs

public static final Mat22 abs(Mat22 R)

Return the matrix composed of the absolute values of all elements.

Returns

Absolute value matrix

absToOut

public static void absToOut(Mat22 R, Mat22 out)

mul

public final Vec2 mul(Vec2 v)

Multiply a vector by this matrix.

Parameters

v Vec2: Vector to multiply by matrix.

Returns

Resulting vector

mulToOut

public final void mulToOut(Vec2 v, Vec2 out)

mulToOutUnsafe

public final void mulToOutUnsafe(Vec2 v, Vec2 out)

mul

public final Mat22 mul(Mat22 R)

Multiply another matrix by this one (this one on left). djm optimized

mulLocal

public final Mat22 mulLocal(Mat22 R)

mulToOut

public final void mulToOut(Mat22 R, Mat22 out)

mulToOutUnsafe

public final void mulToOutUnsafe(Mat22 R, Mat22 out)

mulTrans

public final Mat22 mulTrans(Mat22 B)

Multiply another matrix by the transpose of this one (transpose of this one on left). djm: optimized

mulTransLocal

public final Mat22 mulTransLocal(Mat22 B)

mulTransToOut

public final void mulTransToOut(Mat22 B, Mat22 out)

mulTransToOutUnsafe

public final void mulTransToOutUnsafe(Mat22 B, Mat22 out)

mulTrans

public final Vec2 mulTrans(Vec2 v)

Multiply a vector by the transpose of this matrix.

mulTransToOut

public final void mulTransToOut(Vec2 v, Vec2 out)

add

public final Mat22 add(Mat22 B)

Add this matrix to B, return the result.

addLocal

public final Mat22 addLocal(Mat22 B)

Add B to this matrix locally.

solve

public final Vec2 solve(Vec2 b)

Solve A * x = b where A = this matrix.

Returns

The vector x that solves the above equation.

solveToOut

public final void solveToOut(Vec2 b, Vec2 out)

mul

public static final Vec2 mul(Mat22 R, Vec2 v)

mulToOut

public static final void mulToOut(Mat22 R, Vec2 v, Vec2 out)

mulToOutUnsafe

public static final void mulToOutUnsafe(Mat22 R, Vec2 v, Vec2 out)

mul

public static final Mat22 mul(Mat22 A, Mat22 B)

mulToOut

public static final void mulToOut(Mat22 A, Mat22 B, Mat22 out)

mulToOutUnsafe

public static final void mulToOutUnsafe(Mat22 A, Mat22 B, Mat22 out)

mulTrans

public static final Vec2 mulTrans(Mat22 R, Vec2 v)

mulTransToOut

public static final void mulTransToOut(Mat22 R, Vec2 v, Vec2 out)

mulTransToOutUnsafe

public static final void mulTransToOutUnsafe(Mat22 R, Vec2 v, Vec2 out)

mulTrans

public static final Mat22 mulTrans(Mat22 A, Mat22 B)

mulTransToOut

public static final void mulTransToOut(Mat22 A, Mat22 B, Mat22 out)

mulTransToOutUnsafe

public static final void mulTransToOutUnsafe(Mat22 A, Mat22 B, Mat22 out)

createRotationalTransform

public static final Mat22 createRotationalTransform(float angle)

createRotationalTransform

public static final void createRotationalTransform(float angle, Mat22 out)

createScaleTransform

public static final Mat22 createScaleTransform(float scale)

createScaleTransform

public static final void createScaleTransform(float scale, Mat22 out)

hashCode

public int hashCode()

Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by java.util.Hashtable. The general contract of hashCode is: Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result. It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables. As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)

equals

public boolean equals(Object obj)

Indicates whether some other object is “equal to” this one. The equals method implements an equivalence relation: It is reflexive: for any reference value x, x.equals(x) should return true. It is symmetric: for any reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true. It is transitive: for any reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true. It is consistent: for any reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the object is modified. For any non-null reference value x, x.equals(null) should return false. The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any reference values x and y, this method returns true if and only if x and y refer to the same object (x==y has the value true).