/// Returns 2 theta (scattering angle w.r.t. to beam direction).
double DetectorInfo::twoTheta(const size_t index) const {
const Kernel::V3D samplePos = samplePosition();
const Kernel::V3D beamLine = samplePos - sourcePosition();
if (beamLine.nullVector()) {
throw Kernel::Exception::InstrumentDefinitionError(
"Source and sample are at same position!");
}
return getDetector(index).getTwoTheta(samplePos, beamLine);
}
/// Returns signed 2 theta (signed scattering angle w.r.t. to beam direction).
double DetectorInfo::signedTwoTheta(const size_t index) const {
const Kernel::V3D samplePos = samplePosition();
const Kernel::V3D beamLine = samplePos - sourcePosition();
if (beamLine.nullVector()) {
throw Kernel::Exception::InstrumentDefinitionError(
"Source and sample are at same position!");
}
// Get the instrument up axis.
const Kernel::V3D &instrumentUpAxis =
m_instrument->getReferenceFrame()->vecPointingUp();
return getDetector(index)
.getSignedTwoTheta(samplePos, beamLine, instrumentUpAxis);
}
int Line::setLine(const Kernel::V3D &O, const Kernel::V3D &D)
/**
sets the line given the Origne and direction
@param O :: origin
@param D :: direction
@retval 0 :: Direction == 0 ie no line
@retval 1 :: on success
*/
{
if (D.nullVector())
return 0;
Origin = O;
Direct = D;
Direct.normalize();
return 1;
}