PhotonVision/photonlib-cpp-examples/aimattarget/src/main/include/subsystems/SwerveDriveSim.h

/*
 * MIT License
 *
 * Copyright (c) PhotonVision
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
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 * SOFTWARE.
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#pragma once

#include <random>

#include <wpi/math/controller/SimpleMotorFeedforward.hpp>
#include <wpi/math/kinematics/wpi/math/kinematics/SwerveDriveKinematics.hpppp>
#include <wpi/math/system/LinearSystem.hpp>
#include <wpi/math/system/plant/DCMotor.hpp>
#include <wpi/units/voltage.hpp>

static constexpr int numModules{4};

class SwerveDriveSim {
 public:
  SwerveDriveSim(
      const wpi::math::SimpleMotorFeedforward<wpi::units::meters>& driveFF,
      const wpi::math::DCMotor& driveMotor, double driveGearing,
      wpi::units::meter_t driveWheelRadius,
      const wpi::math::SimpleMotorFeedforward<wpi::units::radians>& steerFF,
      const wpi::math::DCMotor& steerMotor, double steerGearing,
      const wpi::math::SwerveDriveKinematics<numModules>& kinematics);
  SwerveDriveSim(
      const wpi::math::LinearSystem<2, 1, 2>& drivePlant, wpi::units::volt_t driveKs,
      const wpi::math::DCMotor& driveMotor, double driveGearing,
      wpi::units::meter_t driveWheelRadius,
      const wpi::math::LinearSystem<2, 1, 2>& steerPlant, wpi::units::volt_t steerKs,
      const wpi::math::DCMotor& steerMotor, double steerGearing,
      const wpi::math::SwerveDriveKinematics<numModules>& kinematics);
  void SetDriveInputs(const std::array<wpi::units::volt_t, numModules>& inputs);
  void SetSteerInputs(const std::array<wpi::units::volt_t, numModules>& inputs);
  static Eigen::Matrix<double, 2, 1> CalculateX(
      const Eigen::Matrix<double, 2, 2>& discA,
      const Eigen::Matrix<double, 2, 1>& discB,
      const Eigen::Matrix<double, 2, 1>& x, wpi::units::volt_t input,
      wpi::units::volt_t kS);
  void Update(wpi::units::second_t dt);
  void Reset(const wpi::math::Pose2d& pose, bool preserveMotion);
  void Reset(const wpi::math::Pose2d& pose,
             const std::array<Eigen::Matrix<double, 2, 1>, numModules>&
                 moduleDriveStates,
             const std::array<Eigen::Matrix<double, 2, 1>, numModules>&
                 moduleSteerStates);
  wpi::math::Pose2d GetPose() const;
  std::array<wpi::math::SwerveModulePosition, numModules> GetModulePositions()
      const;
  std::array<wpi::math::SwerveModulePosition, numModules>
  GetNoisyModulePositions(wpi::units::meter_t driveStdDev,
                          wpi::units::radian_t steerStdDev);
  std::array<wpi::math::SwerveModuleState, numModules> GetModuleStates();
  std::array<Eigen::Matrix<double, 2, 1>, numModules> GetDriveStates() const;
  std::array<Eigen::Matrix<double, 2, 1>, numModules> GetSteerStates() const;
  wpi::units::radians_per_second_t GetOmega() const;
  wpi::units::ampere_t GetCurrentDraw(const wpi::math::DCMotor& motor,
                                 wpi::units::radians_per_second_t velocity,
                                 wpi::units::volt_t inputVolts,
                                 wpi::units::volt_t batteryVolts) const;
  std::array<wpi::units::ampere_t, numModules> GetDriveCurrentDraw() const;
  std::array<wpi::units::ampere_t, numModules> GetSteerCurrentDraw() const;
  wpi::units::ampere_t GetTotalCurrentDraw() const;

 private:
  std::random_device rd{};
  std::mt19937 generator{rd()};
  std::normal_distribution<double> randDist{0.0, 1.0};
  const wpi::math::LinearSystem<2, 1, 2> drivePlant;
  const wpi::units::volt_t driveKs;
  const wpi::math::DCMotor driveMotor;
  const double driveGearing;
  const wpi::units::meter_t driveWheelRadius;
  const wpi::math::LinearSystem<2, 1, 2> steerPlant;
  const wpi::units::volt_t steerKs;
  const wpi::math::DCMotor steerMotor;
  const double steerGearing;
  const wpi::math::SwerveDriveKinematics<numModules> kinematics;
  std::array<wpi::units::volt_t, numModules> driveInputs{};
  std::array<Eigen::Matrix<double, 2, 1>, numModules> driveStates{};
  std::array<wpi::units::volt_t, numModules> steerInputs{};
  std::array<Eigen::Matrix<double, 2, 1>, numModules> steerStates{};
  wpi::math::Pose2d pose{wpi::math::Pose2d{}};
  wpi::units::radians_per_second_t omega{0};
};