Ejemplo n.º 1
0
int TileBoundsCalculator::_calculateSplitX(PixelBox& b)
{
  double total = _sumPixels(b);

  double left = _sumPixels(b.getColumnBox(b.minX));

  int best = (b.maxX + b.minX) / 2;
  double bestSum = numeric_limits<double>::max();

  double thisSlop = _slop + 1.0 / (double)(b.maxX - b.minX);

  if (b.getWidth() < 6)
  {
    throw HootException("The input box must be at least six pixels high.");
  }

  for (int c = b.minX + 2; c < b.maxX - 2; c++)
  {
    double colSum = _sumPixels(b.getColumnBox(c));
    double colSumMin = _sumPixels(b.getColumnBox(c), _min) +
      _sumPixels(b.getColumnBox(c + 1), _min);
    left += colSum;

    double slop = abs(0.5 - left / total);
    if ((slop < thisSlop) && colSumMin < bestSum)
    {
      best = c;
      bestSum = colSumMin;
    }
  }

  if (bestSum == numeric_limits<double>::max())
  {
    LOG_WARN("bestSum isn't valid. " << b.toString());
  }

  return best;
}