bool
avtLCSIC::CheckForTermination(avtIVPStep& step, avtIVPField *field)
{
bool shouldTerminate = false;
// Check for termination.
if( doTime )
{
if( (direction == DIRECTION_FORWARD && step.GetT1() >= maxTime) ||
(direction == DIRECTION_BACKWARD && step.GetT1() <= maxTime) )
shouldTerminate = true;
}
if( doDistance )
{
double Lstep = step.GetLength();
double Ltogo = std::abs(maxDistance) - distance;
if( Lstep > Ltogo )
{
step.ClampToLength( Ltogo );
shouldTerminate = true;
}
else if (field->VelocityIsInstantaneous() &&
(Lstep / std::abs(step.t1 - step.t0) < 1e-8))
{
{
// Above condition ensures that the curve makes progress
// w.r.t. distance to avoid infinite integration into a
// critical point.
//
// FIXME: I don't like the above hardcoded threshold -
// this should probably be something like
// Lstep / Lmax < 1e-6 ?
//
// FIXME: Also, this should only be tested in the stationary
// case, since in a time-varying scenario, the critical point
// might move.
shouldTerminate = true;
}
}
}
if( !shouldTerminate && numSteps >= maxSteps )
{
terminatedBecauseOfMaxSteps = true;
shouldTerminate = true;
}
// Update other termination criteria.
numSteps += 1;
return shouldTerminate;
}
// ****************************************************************************
// Method: avtLCSIC::AnalyzeStep
//
// Purpose:
// Analyzes the current step.
//
// Programmer: Allen Sanderson
// Creation: August 14, 2013
//
// Modifications:
//
// ****************************************************************************
void avtLCSIC::AnalyzeStep( avtIVPStep &step,
avtIVPField *field)
{
if (CheckForTermination(step, field))
status.SetTerminationMet();
// These must be called after CheckForTermination, because
// CheckForTermination will modify the step if it goes beyond the
// termination criteria. (Example: streamlines will split a step if it
// is terminating by distance.)
p_end = step.GetP1();
time = step.GetT1();
arcLength += step.GetLength();
distance += step.GetLength();
summation0 += (p_start - p_end).length();
summation1 = (p_start - p_end).length();
}
virtual void AnalyzeStep( avtIVPStep &step, avtIVPField *field)
{
avtVector p = step.GetP1();
dist += sqrt((p.x-last_loc[0])*(p.x-last_loc[0])+
(p.y-last_loc[1])*(p.y-last_loc[1]));
last_loc[0] = p.x;
last_loc[1] = p.y;
if (numSteps++ >= 1000)
status = STATUS_FINISHED;
}
void
avtStateRecorderIntegralCurve::AnalyzeStep( avtIVPStep& step,
avtIVPField* field )
{
if (history.size() == 0)
{
// Record the first position of the step.
RecordStep( field, step, step.GetT0() );
}
if (CheckForTermination(step, field))
status.SetTerminationMet();
// These must be called after CheckForTermination, because
// CheckForTermination will modify the step if it goes beyond the
// termination criteria. (Example: streamlines will split a step if it
// is terminating by distance.)
time = step.GetT1();
distance += step.GetLength();
RecordStep( field, step, step.GetT1() );
}
void avtStateRecorderIntegralCurve::RecordStep(const avtIVPField* field,
const avtIVPStep& step,
double t)
{
avtVector p = step.GetP(t);
/*
//If the step is within tolerance of the previous step, just overwrite the last step
//with this step.
size_t nSamp = GetNumberOfSamples();
if (nSamp > 1)
{
Sample prevSamp = GetSample(nSamp-1);
if ((p-prevSamp.position).length2() < epsilon)
{
std::vector<double>::iterator m = history.begin() + (nSamp-1)*GetSampleStride();
history.erase(m, history.end());
}
}
*/
if( historyMask & SAMPLE_TIME )
history.push_back( t );
if( historyMask & SAMPLE_POSITION )
{
history.push_back( p.x );
history.push_back( p.y );
history.push_back( p.z );
}
if( historyMask & SAMPLE_VELOCITY )
{
avtVector v = step.GetV( t );
history.push_back( v.x );
history.push_back( v.y );
history.push_back( v.z );
}
if( historyMask & SAMPLE_VORTICITY )
history.push_back( field->ComputeVorticity( t, p ) );
if( historyMask & SAMPLE_ARCLENGTH )
history.push_back( distance );
if( historyMask & SAMPLE_VARIABLE )
history.push_back( field->ComputeScalarVariable( variableIndex, t, p ) );
if( historyMask & SAMPLE_SECONDARY0 )
history.push_back( field->ComputeScalarVariable( 0, t, p ) );
if( historyMask & SAMPLE_SECONDARY1 )
history.push_back( field->ComputeScalarVariable( 1, t, p ) );
if( historyMask & SAMPLE_SECONDARY2 )
history.push_back( field->ComputeScalarVariable( 2, t, p ) );
if( historyMask & SAMPLE_SECONDARY3 )
history.push_back( field->ComputeScalarVariable( 3, t, p ) );
if( historyMask & SAMPLE_SECONDARY4 )
history.push_back( field->ComputeScalarVariable( 4, t, p ) );
if( historyMask & SAMPLE_SECONDARY5 )
history.push_back( field->ComputeScalarVariable( 5, t, p ) );
}