Method angleToDisplayFormat

src/Mod/Sketcher/Gui/Utils.cpp:915–965

convert value to display format %0.[digits]f. Units are always displayed for angles - 123.456° or 12°34'56". Digits parameter is ignored for multi-unit schemata. Note small differences between this method and lengthToDisplyFormat TODO:: if the user string is delivered in 1.23e45 format, this might not work correctly.

// TODO:: if the user string is delivered in 1.23e45 format, this might not work
//        correctly.
std::string SketcherGui::angleToDisplayFormat(double value, int digits)
{
    Base::Quantity asQuantity;
    asQuantity.setValue(value);
    asQuantity.setUnit(Base::Unit::Angle);
    QString qUserString = QString::fromStdString(asQuantity.getUserString());
    if (Base::UnitsApi::isMultiUnitAngle()) {
        // just return the user string
        // Coin SbString doesn't handle utf8 well, so we convert to ascii
        QString schemeMinute = QStringLiteral("\xE2\x80\xB2");  // prime symbol
        QString schemeSecond = QStringLiteral("\xE2\x80\xB3");  // double prime symbol
        QString escapeMinute = QStringLiteral("\'");            // substitute ascii single quote
        QString escapeSecond = QStringLiteral("\"");            // substitute ascii double quote
        QString displayString = qUserString.replace(schemeMinute, escapeMinute);
        displayString = displayString.replace(schemeSecond, escapeSecond);
        return displayString.toStdString();
    }

    // we always use use U+00B0 (°) as the unit of measure for angles in
    // single unit schema.  Will need a change to support rads or grads.
    std::string unitString = "°";
    auto decimalSep = QLocale().decimalPoint();

    // get the numeric part of the user string
    QRegularExpression rxNoUnits(
        QStringLiteral("(\\d*\\%1?\\d*)(\\D*)$").arg(decimalSep)
    );  // number + non digits at end of string
    QRegularExpressionMatch match = rxNoUnits.match(qUserString);
    if (!match.hasMatch()) {
        // no units in userString?
        return qUserString.toStdString();
    }
    QString matched = match.captured(1);  // matched is the numeric part of user string
    int dpPos = matched.indexOf(decimalSep);
    if (dpPos < 0 || useSystemDecimals()) {
        // just the numeric part of the user string + degree symbol
        auto angle = matched.toStdString();
        angle.append(unitString);
        return angle;
    }

    // real number and not using system decimals
    int requiredLength = dpPos + digits + 1;
    if (requiredLength > matched.size()) {
        // just take the whole thing
        requiredLength = matched.size();
    }
    auto numericPart = matched.left(requiredLength).toStdString();
    numericPart.append(unitString);
    return numericPart;
}


bool SketcherGui::areCollinear(