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* Copyright (c) 2013 Jan Rheinländer *
* <jrheinlaender@users.sourceforge.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include <Precision.hxx>
#include "FemConstraintForce.h"
using namespace Fem;
PROPERTY_SOURCE(Fem::ConstraintForce, Fem::Constraint)
ConstraintForce::ConstraintForce()
{
ADD_PROPERTY(Force, (0.0));
ADD_PROPERTY_TYPE(
Direction,
(nullptr),
"ConstraintForce",
(App::PropertyType)(App::Prop_None),
"Element giving direction of constraint"
);
// RefDispl must get a global scope, see
Direction.setScope(App::LinkScope::Global);
ADD_PROPERTY(Reversed, (0));
ADD_PROPERTY_TYPE(
DirectionVector,
(Base::Vector3d(0, 0, 1)),
"ConstraintForce",
App::PropertyType(App::Prop_ReadOnly | App::Prop_Output),
"Direction of arrows"
);
// by default use the null vector to indicate an invalid value
naturalDirectionVector = Base::Vector3d(0, 0, 0);
ADD_PROPERTY_TYPE(
EnableAmplitude,
(false),
"ConstraintForce",
(App::PropertyType)(App::Prop_None),
"Amplitude of the force load"
);
ADD_PROPERTY_TYPE(
AmplitudeValues,
(std::vector<std::string> {"0, 0", "1, 1"}),
"ConstraintForce",
(App::PropertyType)(App::Prop_None),
"Amplitude values"
);
}
App::DocumentObjectExecReturn* ConstraintForce::execute()
{
return Constraint::execute();
}
void ConstraintForce::handleChangedPropertyType(
Base::XMLReader& reader,
const char* TypeName,
App::Property* prop
)
{
// property Force had App::PropertyFloat, was changed to App::PropertyForce
if (prop == &Force && strcmp(TypeName, "App::PropertyFloat") == 0) {
App::PropertyFloat ForceProperty;
// restore the PropertyFloat to be able to set its value
ForceProperty.Restore(reader);
// force uses m while FreeCAD uses internally mm thus
// e.g. "2.5" must become 2500 to result in 2.5 N
Force.setValue(ForceProperty.getValue() * 1000);
}
else {
Constraint::handleChangedPropertyType(reader, TypeName, prop);
}
}
void ConstraintForce::onChanged(const App::Property* prop)
{
// Note: If we call this at the end, then the arrows are not oriented correctly initially
// because the NormalDirection has not been calculated yet
Constraint::onChanged(prop);
if (prop == &Direction) {
Base::Vector3d direction = getDirection(Direction);
if (direction.Length() < Precision::Confusion()) {
return;
}
naturalDirectionVector = direction;
if (Reversed.getValue()) {
direction = -direction;
}
DirectionVector.setValue(direction);
}
else if (prop == &Reversed) {
// if the direction is invalid try to compute it again
if (naturalDirectionVector.Length() < Precision::Confusion()) {
naturalDirectionVector = getDirection(Direction);
}
if (naturalDirectionVector.Length() >= Precision::Confusion()) {
if (Reversed.getValue() && (DirectionVector.getValue() == naturalDirectionVector)) {
DirectionVector.setValue(-naturalDirectionVector);
}
else if (!Reversed.getValue() && (DirectionVector.getValue() != naturalDirectionVector)) {
DirectionVector.setValue(naturalDirectionVector);
}
}
}
else if (prop == &NormalDirection) {
// Set a default direction if no direction reference has been given
if (!Direction.getValue()) {
Base::Vector3d direction = NormalDirection.getValue();
if (Reversed.getValue()) {
direction = -direction;
}
DirectionVector.setValue(direction);
naturalDirectionVector = direction;
}
}
}
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