DOMMatrix: multiplySelf() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

Note: This feature is available in Web Workers.

The multiplySelf() method of the DOMMatrix interface multiplies a matrix by the otherMatrix parameter, computing the dot product of the original matrix and the specified matrix: A⋅B. If no matrix is specified as the multiplier, the matrix is multiplied by a matrix in which every element is 0 except the bottom-right corner and the element immediately above and to its left: m33 and m34. These have the default value of 1.

To multiply a matrix without mutating it, see DOMMatrixReadOnly.multiply().

Syntax

js
  DOMMatrix.multiplySelf()
  DOMMatrix.multiplySelf(otherMatrix)

Parameters

otherMatrix Optional

The DOMMatrix multiplier.

Return value

Returns itself; the DOMMatrix updated to the results of the applied multiplications.

Examples

js
const matrix = new DOMMatrix().rotate(30);

console.log(matrix.toString());
// output: matrix(0.866, 0.5, -0.5, 0.866, 0, 0)

matrix.multiplySelf(matrix);

console.log(matrix.toString());
// output: matrix(0.5, 0.866, -0.866, 0.5, 0, 0) (a 60deg rotation)

Specifications

Specification
Geometry Interfaces Module Level 1
# dom-dommatrix-multiplyself

Browser compatibility

BCD tables only load in the browser

See also