double const text_width_in = text_width / (zoom * dpi);
double const result = zoom * dpi * inInch(text_width_in, em_width_in);
double const text_width_in = text_width / (zoom * dpi);
double const result = zoom * dpi * inInch(text_width_in, em_width_in);
double const text_width_in = 210.0 / 2.54; // assume A4
double const em_width_in = 10.0 / 72.27;
double result = 72.0 * inInch(text_width_in, em_width_in);
double const text_width_in = 210.0 / 2.54; // assume A4
double const em_width_in = 10.0 / 72.27;
double result = 72.0 * inInch(text_width_in, em_width_in);