interpolation_2d.h

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/******************************************************************************
 * Copyright 2018 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
 * limitations under the License.
 *****************************************************************************/
#pragma once
 
#include <map>
#include <memory>
#include <tuple>
#include <utility>
#include <vector>
 
namespace apollo {
namespace dreamview {
 
class Interpolation2D {
 public:
  typedef std::vector<std::tuple<double, double, double>> DataType;
  typedef std::pair<double, double> KeyType;
 
  Interpolation2D() = default;
 
  // Return true if init is ok.
  bool init(const DataType& xyz);
 
  double Interpolate(const KeyType& xy) const;
 
 private:
  double InterpolateYz(const std::map<double, double>& yz_table,
                       double y) const;
 
  double InterpolateValue(const double value_before, const double dist_before,
                          const double value_after,
                          const double dist_after) const;
 
  std::map<double, std::map<double, double>> _xyz;
};
 
}  // namespace dreamview
}  // namespace apollo