The DOMMatrixReadOnly interface represents a read-only 4×4 matrix, suitable for 2D and 3D operations. The DOMMatrix interface — which is based upon DOMMatrixReadOnly—adds mutability, allowing you to alter the matrix after creating it.

This interface should be available inside web workers, though some implementations doesn't allow it yet.

Constructor

DOMMatrixReadOnly()

Creates a new DOMMatrixReadOnly object.

Instance properties

This interface doesn't inherit any properties.

DOMMatrixReadOnly.is2D Read only

A Boolean flag whose value is true if the matrix was initialized as a 2D matrix. If false, the matrix is 3D.

DOMMatrixReadOnly.isIdentity Read only

A Boolean whose value is true if the matrix is an identity matrix.

m11, m12, m13, m14, m21, m22, m23, m24, m31, m32, m33, m34, m41, m42, m43, m44 Read only

Double-precision floating-point values representing each component of a 4×4 matrix, where m11 through m14 are the first column, m21 through m24 are the second column, and so forth.

a, b, c, d, e, f Read only

Double-precision floating-point values representing the components of a 4×4 matrix which are required in order to perform 2D rotations and translations. These are aliases for specific components of a 4×4 matrix, as shown below.

2D	3D equivalent
a	m11
b	m12
c	m21
d	m22
e	m41
f	m42

Static methods

fromFloat32Array()

Creates a new DOMMatrixReadOnly object given a Float32Array of 6 or 16 single-precision (32-bit) floating-point values.

fromFloat64Array()

Creates a new DOMMatrixReadOnly object given a Float64Array of 6 or 16 double-precision (64-bit) floating-point values.

fromMatrix()

Creates a new DOMMatrixReadOnly object given an existing matrix or an object which provides the values for its properties.

Instance methods

This interface doesn't inherit any methods. None of the following methods alter the original matrix.

DOMMatrixReadOnly.flipX()

Returns a new DOMMatrix created by flipping the source matrix around its X-axis. This is equivalent to multiplying the matrix by DOMMatrix(-1, 0, 0, 1, 0, 0). The original matrix is not modified.

DOMMatrixReadOnly.flipY()

Returns a new DOMMatrix created by flipping the source matrix around its Y-axis. This is equivalent to multiplying the matrix by DOMMatrix(1, 0, 0, -1, 0, 0). The original matrix is not modified.

DOMMatrixReadOnly.inverse()

Returns a new DOMMatrix created by inverting the source matrix. The original matrix is not altered.

DOMMatrixReadOnly.multiply()

Returns a new DOMMatrix created by computing the dot product of the source matrix and the specified matrix. The original matrix is not modified.

DOMMatrixReadOnly.rotateAxisAngle()

Returns a new DOMMatrix created by rotating the source matrix by the given angle around the specified vector. The original matrix is not modified.

DOMMatrixReadOnly.rotate()

Returns a new DOMMatrix created by rotating the source matrix around each of its axes by the specified number of degrees. The original matrix is not altered.

DOMMatrixReadOnly.rotateFromVector()

Returns a new DOMMatrix created by rotating the source matrix by the angle between the specified vector and (1, 0). The original matrix is not modified.

DOMMatrixReadOnly.scale()

Returns a new DOMMatrix created by scaling the source matrix by the amount specified for each axis, centered on the given origin. By default, the X and Z axes are scaled by 1 and the Y axis has no default scaling value. The default origin is (0, 0, 0). The original matrix is not modified.

DOMMatrixReadOnly.scale3d()

Returns a new DOMMatrix created by scaling the source 3D matrix by the given factor along all its axes, centered on the specified origin point. The default origin is (0, 0, 0). The original matrix is not modified.

DOMMatrixReadOnly.scaleNonUniform()

Returns a new DOMMatrix created by applying the specified scaling on the X, Y, and Z axes, centered at the given origin. By default, the Y and Z axes' scaling factors are both 1, but the scaling factor for X must be specified. The default origin is (0, 0, 0). The original matrix is not changed.

DOMMatrixReadOnly.skewX()

Returns a new DOMMatrix created by applying the specified skew transformation to the source matrix along its X-axis. The original matrix is not modified.

DOMMatrixReadOnly.skewY()

Returns a new DOMMatrix created by applying the specified skew transformation to the source matrix along its Y-axis. The original matrix is not modified.

DOMMatrixReadOnly.toFloat32Array()

Returns a new Float32Array of single-precision floating-point numbers, containing all 16 elements which comprise the matrix.

DOMMatrixReadOnly.toFloat64Array()

Returns a new Float64Array of double-precision floating-point numbers, containing all 16 elements which comprise the matrix.

DOMMatrixReadOnly.toJSON()

Returns a JSON-serializable plain object representing the DOMMatrixReadOnly object. Automatically called by JSON.stringify().

DOMMatrixReadOnly.toString()

Creates and returns a string representation of the matrix in CSS matrix syntax, using the appropriate CSS matrix notation.

DOMMatrixReadOnly.transformPoint()

Transforms the specified point using the matrix, returning a new DOMPoint object containing the transformed point. Neither the matrix nor the original point are altered.

DOMMatrixReadOnly.translate()

Returns a new DOMMatrix containing a matrix calculated by translating the source matrix using the specified vector. By default, the vector is (0, 0, 0). The original matrix is not changed.

Specifications

Browser compatibility

See also

• The mutable matrix type, DOMMatrix, which is based on this one.
• The CSS matrix() and matrix3d() functional notation that can be generated from this interface to be used in a CSS transform.