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DOMMatrix: preMultiplySelf() method - Web APIs

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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.

preMultiplySelf()
preMultiplySelf(otherMatrix)

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

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)

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