DOMMatrix: preMultiplySelf() 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 preMultiplySelf() method of the DOMMatrix interface modifies the matrix by pre-multiplying it with the specified DOMMatrix. This is equivalent to the dot product B⋅A, where matrix A is the source matrix and B is the matrix given as an input to the method. 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.

Syntax

js
  DOMMatrix.preMultiplySelf()
  DOMMatrix.preMultiplySelf(otherMatrix)

Parameters

otherMatrix Optional

The DOMMatrix multiplier.

Return value

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

Examples

js
const matrix = new DOMMatrix().translate(3, 22);
const otherMatrix = new DOMMatrix().translateSelf(15, 45);

console.log(matrix.toString()); // output: matrix(1, 0, 0, 1, 3, 22)
console.log(otherMatrix.toString()); // output: matrix(1, 0, 0, 1, 15, 45)

matrix.preMultiplySelf(otherMatrix);

console.log(matrix.toString()); // output: matrix(1, 0, 0, 1, 18, 67)
console.log(otherMatrix.toString()); // output: matrix(1, 0, 0, 1, 15, 45)

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also