/**
* Gets the eFixed value from the workspace using the instrument parameters.
*
* @param ws Pointer to the workspace
* @return eFixed value
*/
double IndirectTab::getEFixed(Mantid::API::MatrixWorkspace_sptr ws) {
Mantid::Geometry::Instrument_const_sptr inst = ws->getInstrument();
if (!inst)
throw std::runtime_error("No instrument on workspace");
// Try to get the parameter form the base instrument
if (inst->hasParameter("Efixed"))
return inst->getNumberParameter("Efixed")[0];
// Try to get it form the analyser component
if (inst->hasParameter("analyser")) {
std::string analyserName = inst->getStringParameter("analyser")[0];
auto analyserComp = inst->getComponentByName(analyserName);
if (analyserComp && analyserComp->hasParameter("Efixed"))
return analyserComp->getNumberParameter("Efixed")[0];
}
throw std::runtime_error("Instrument has no efixed parameter");
}
/**
* Attempt to extract an instrument double parameter from a specified
* instrument.
*
* @param instrument The instrument to extract the parameter from.
* @param parameterName The name of the parameter to extract.
*
* @return The extracted parameter if it is found, else
* boost::none.
*/
boost::optional<double> CalculatePaalmanPings::getInstrumentParameter(
Mantid::Geometry::Instrument_const_sptr instrument,
const std::string ¶meterName) {
if (instrument->hasParameter(parameterName)) {
const auto parameterValue = QString::fromStdString(
instrument->getStringParameter(parameterName)[0]);
return parameterValue.toDouble();
}
return boost::none;
}