Constraint.h

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/*******************************************************************************
 * Copyright (C) 2017-2025 Theodore Chang
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
#ifndef CONSTRAINT_H
#define CONSTRAINT_H
 
#include <Domain/ConditionalModifier.h>
 
class Constraint : public ConditionalModifier {
protected:
    static double multiplier;
 
    unsigned num_size; // size of multiplier
 
    vec trial_lambda = zeros(num_size);
    vec current_lambda = zeros(num_size);
 
    sp_vec resistance;
    sp_mat stiffness;
 
    vec auxiliary_resistance;
    vec auxiliary_load;
    sp_mat auxiliary_stiffness;
 
    friend void set_constraint_multiplier(double);
 
public:
    Constraint(
        unsigned, // tag
        unsigned, // amplitude tag
        uvec&&,   // node tags
        uvec&&,   // dof tags
        unsigned  // size of multiplier
    );
 
    const sp_vec& get_resistance() const;
    const sp_mat& get_stiffness() const;
 
    const vec& get_auxiliary_resistance() const;
    const vec& get_auxiliary_load() const;
    const sp_mat& get_auxiliary_stiffness() const;
 
    void set_multiplier_size(unsigned);
    [[nodiscard]] unsigned get_multiplier_size() const;
};
 
void set_constraint_multiplier(double);
 
#endif