Custom formatting numbers in axes of QCustomPlot

Question

I would like to set the formatting of numbers in axes of QCustomPlot. I know how to deal with decimal precision, but have no idea, how to use spaces instead of commas in case of large numbers.

I would like numbers to look like this:

1.045   (decimals separated with a dot)
1 000  (thousands separated with space, currently I get 1,000)

there is a method QCPAxis::setNumberFormat, which seems to not be what I am looking for.

Answer 1

You need to subclass QCPAxisTicker and reimplement getTickLabel method

I couldn't find locale that would do spaces as group separator and dot as decimal point so i instead used QString replace function to make "custom separators".

Quick and dirty example:

QString getTickLabel (double tick, const QLocale &locale, QChar formatChar, int precision) {
    QLocale l;
    QString number = l.toString(tick, 'g', 15);
    number.replace(l.decimalPoint(), ".");
    number.replace(l.groupSeparator(), " ");

    return number;
}

input:

1000000.1411

output:

"1 000 000.1411"