TransientForm.hpp

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#pragma once
 
#include "AdjointForm.hpp"
 
namespace polyfem::solver
{
    class TransientForm : public AdjointForm
    {
    public:
        TransientForm(const VariableToSimulationGroup &variable_to_simulations, const int time_steps, const double dt, const std::string &transient_integral_type, const std::vector<int> &steps, const std::shared_ptr<StaticForm> &obj) : AdjointForm(variable_to_simulations), time_steps_(time_steps), dt_(dt), steps_(steps), obj_(obj), transient_integral_type_(transient_integral_type) {}
        virtual ~TransientForm() = default;
 
        virtual Eigen::MatrixXd compute_adjoint_rhs(const Eigen::VectorXd &x, const State &state) const override;
        virtual void compute_partial_gradient(const Eigen::VectorXd &x, Eigen::VectorXd &gradv) const override;
 
        void init(const Eigen::VectorXd &x) override;
        bool is_step_valid(const Eigen::VectorXd &x0, const Eigen::VectorXd &x1) const override;
        double max_step_size(const Eigen::VectorXd &x0, const Eigen::VectorXd &x1) const override;
        void line_search_begin(const Eigen::VectorXd &x0, const Eigen::VectorXd &x1) override;
        void line_search_end() override;
        void post_step(const polysolve::nonlinear::PostStepData &data) override;
        void solution_changed(const Eigen::VectorXd &new_x) override;
        bool is_step_collision_free(const Eigen::VectorXd &x0, const Eigen::VectorXd &x1) const override;
 
    protected:
        virtual double value_unweighted(const Eigen::VectorXd &x) const override;
 
        int time_steps_;
        double dt_;
        std::vector<int> steps_;
        std::shared_ptr<StaticForm> obj_;
    
    private:
        std::vector<double> get_transient_quadrature_weights() const;
        std::string transient_integral_type_;
    };
 
    class ProxyTransientForm : public TransientForm
    {
    public:
        ProxyTransientForm(const VariableToSimulationGroup &variable_to_simulations, const int time_steps, const double dt, const std::string &transient_integral_type, const std::vector<int> &steps, const std::shared_ptr<StaticForm> &obj) : TransientForm(variable_to_simulations, time_steps, dt, transient_integral_type, steps, obj) {}
        virtual ~ProxyTransientForm() = default;
 
        Eigen::MatrixXd compute_adjoint_rhs(const Eigen::VectorXd &x, const State &state) const override;
        void compute_partial_gradient(const Eigen::VectorXd &x, Eigen::VectorXd &gradv) const override;
 
    protected:
        double value_unweighted(const Eigen::VectorXd &x) const override;
 
    private:
        double eval(const Eigen::VectorXd &y) const;
        Eigen::VectorXd eval_grad(const Eigen::VectorXd &y) const;
    };
}