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double Inkscape::decimal_round ( double const   x,
int const   nplaces 
) [inline]

Returns x rounded to the nearest nplaces decimal places.

Implemented in terms of Inkscape::round, i.e. we make no guarantees as to what happens if x is half way between two rounded numbers. Add a note to the documentation if you care which candidate is chosen for such case (round towards -infinity, +infinity, 0, or "even").

Note: nplaces is the number of decimal places without using scientific (e) notation, not the number of significant figures. This function may not be suitable for values of x whose magnitude is so far from 1 that one would want to use scientific (e) notation.

The current implementation happens to allow nplaces to be negative: e.g. nplaces=-2 means rounding to a multiple of 100. May or may not be useful.

Definition at line 25 of file decimal-round.h.

References round().

Referenced by ColorRGBA::getIntValue(), and NR::Point::round().

    double const multiplier = std::pow(10.0, nplaces);
    return Inkscape::round( x * multiplier ) / multiplier;

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