bool
avtStreamlineIC::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;
}
}
}
++numSteps;
if( !shouldTerminate && numSteps >= maxSteps )
{
terminatedBecauseOfMaxSteps = true;
shouldTerminate = true;
}
return shouldTerminate;
}
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() );
}
// ****************************************************************************
// 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();
}