@progress/kendo-charts/dist/es/common/element-scale.js

Kendo UI platform-independent Charts library

import { geometry } from '@progress/kendo-drawing';

const Matrix = geometry.Matrix;
const matrixRegexp = /matrix\((.*)\)/;

function parseMatrix(matrixString) {
    const match = matrixString.match(matrixRegexp);
    if (match === null || match.length !== 2) {
        return Matrix.unit();
    }

    const members = match[1].split(',').map(x => parseFloat(x));
    return new Matrix(...members);
}

function transformMatrix(element) {
    const transform = getComputedStyle(element).transform;

    if (transform === 'none') {
        return Matrix.unit();
    }

    return parseMatrix(transform);
}

export default function elementScale(element) {
    if (!element) {
        return Matrix.unit();
    }

    let matrix = transformMatrix(element);
    let parent = element.parentElement;
    while (parent) {
        const parentMatrix = transformMatrix(parent);
        matrix = matrix.multiplyCopy(parentMatrix);
        parent = parent.parentElement;
    }

    matrix.b = matrix.c = matrix.e = matrix.f = 0;
    return matrix;
}