matrix transform apply

transformApply.js

/** @typedef {[number,number,number,number,number,number]} Matrix*/

const transformApply = (/**@type {Matrix} */matrix, point=[0,0]) => {
  // extract the transformation matrix values
  const [scaleX, skewY, skewX, scaleY, translateX, translateY] = matrix
  const [x, y] = point
  // apply the transformation matrix to the point
  return [
    x * scaleX + y * skewX + translateX,
    x * skewY + y * scaleY + translateY
  ]
}