A question of style and design

[wysota]

If you only want to distinguish between horizontal and vertical, you can use the following:

double ImageScaler::scaleFactor(RubberBands::lineType type) const{
  return type == RubberBands::horizontal ? _scaleFactorX : _scaleFactorY;
}

double ImageScaler::scaleFactor(RubberBands::lineType type) const{
  return type == RubberBands::horizontal ? _scaleFactorX : _scaleFactorY;
}

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Without any compiler warnings