constant_deceleration_trajectory1d.h

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 * Copyright 2017 The Apollo Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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#pragma once

#include <string>

#include "modules/planning/math/curve1d/curve1d.h"

namespace apollo {
namespace planning {

class ConstantDecelerationTrajectory1d : public Curve1d {
 public:
  ConstantDecelerationTrajectory1d(const double init_s, const double init_v,
                                   const double a);

  virtual ~ConstantDecelerationTrajectory1d() = default;

  double ParamLength() const override;

  std::string ToString() const override;

  // handles extrapolation internally
  double Evaluate(const std::uint32_t order, const double param) const override;

 private:
  double Evaluate_s(const double t) const;

  double Evaluate_v(const double t) const;

  double Evaluate_a(const double t) const;

  double Evaluate_j(const double t) const;

  double init_s_;

  double init_v_;

  double deceleration_;

  double end_t_;

  double end_s_;
};

}  // namespace planning
}  // namespace apollo