gns3-web-ui/src/app/cartography/helpers/font-bbox-calculator.ts

import { Injectable } from "@angular/core";

@Injectable()
export class FontBBoxCalculator {
  calculate(text: string, styles: string) {
    const element = document.createElement("text");
    element.innerText = text;
    element.setAttribute("fill", "#00000");
    element.setAttribute("fill-opacity", "0");
    element.setAttribute("style", styles);
    document.documentElement.appendChild(element);
    const bbox = element.getBoundingClientRect();
    document.documentElement.removeChild(element);

    return {
      width: bbox.width,
      height: bbox.height
    }
  }
}