/** Constructor
 *
 * @param workspace :: IMDWorkspace to plot
 * @param logScale :: true to plot Y in log scale
 * @param start :: start point in N-dimensions of the line
 * @param end :: end point in N-dimensions of the line
 * @param normalize :: method for normalizing the line
 * @param isDistribution :: is this a distribution (divide by bin width?)
 * @return
 */
MantidQwtIMDWorkspaceData::MantidQwtIMDWorkspaceData(Mantid::API::IMDWorkspace_const_sptr workspace, const bool logScale,
    Mantid::Kernel::VMD start, Mantid::Kernel::VMD end,
    Mantid::API::MDNormalization normalize,
    bool isDistribution)
 : m_workspace(workspace),
   m_logScale(logScale), m_minPositive(0),
   m_preview(false),
   m_start(start),
   m_end(end),
   m_normalization(normalize),
   m_isDistribution(isDistribution),
   m_transform(NULL),
   m_plotAxis(PlotDistance), m_currentPlotAxis(PlotDistance)
{
  if (start.getNumDims() == 1 && end.getNumDims() == 1)
  {
    if (start[0] == 0.0 && end[0] == 0.0)
    {
      // Default start and end. Find the limits
      Mantid::Geometry::VecIMDDimension_const_sptr nonIntegDims = m_workspace->getNonIntegratedDimensions();
      std::string alongDim = "";
      if (!nonIntegDims.empty())
        alongDim = nonIntegDims[0]->getName();
      else
        alongDim = m_workspace->getDimension(0)->getName();

      size_t nd = m_workspace->getNumDims();
      m_start = VMD(nd);
      m_end = VMD(nd);
      for (size_t d=0; d<nd; d++)
      {
        IMDDimension_const_sptr dim = m_workspace->getDimension(d);
        if (dim->getDimensionId() == alongDim)
        {
          // All the way through in the single dimension
          m_start[d] = dim->getMinimum();
          m_end[d] = dim->getMaximum();
        }
        else
        {
          // Mid point along each dimension
          m_start[d] = (dim->getMaximum() + dim->getMinimum()) / 2.0f;
          m_end[d] = m_start[d];
        }
      }
    }
  }
  // Unit direction of the line
  m_dir = m_end - m_start;
  m_dir.normalize();
  // And cache the X/Y values
  this->cacheLinePlot();
}
 bool operator()(IMDDimension_const_sptr b) {
   return _a->getDimensionId() == b->getDimensionId();
 }