text: /*********************************************************************************
   *
   * Inviwo - Interactive Visualization Workshop
   *
   * Copyright (c) 2014-2017 Inviwo Foundation
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   * list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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   *********************************************************************************/
  
  #ifndef IVW_DATAMAPPER_H
  #define IVW_DATAMAPPER_H
  
  #include <inviwo/core/common/inviwocoredefine.h>
  #include <inviwo/core/common/inviwo.h>
  
  namespace inviwo {
  /**
   * \brief Map values into data or value ranges.
   * Data range refer to the range of the data type, i.e. [0 4095] for 12-bit unsigned integer data.
   * Value range refer to the physical meaning of the value, i.e. Hounsfield value range is from
   * [-1000 3000].
   */
  class IVW_CORE_API DataMapper {
  public:
      DataMapper();
      DataMapper(const DataFormatBase* format);
      DataMapper(const DataMapper& rhs);
      DataMapper& operator=(const DataMapper& that);
      virtual DataMapper* clone() const;
      virtual ~DataMapper() {}
  
      dvec2 dataRange;       ///< Minimum and maximum data range
      dvec2 valueRange;      ///< Minimum and maximum value range
      std::string valueUnit; ///< Unit, i.e. Hounsfield/absorption/W.
  
      void initWithFormat(const DataFormatBase* format);
  
      template <typename T>
      T mapFromDataToValue(T val) const {
          return static_cast<T>((static_cast<double>(val) - dataRange.x) /
                                    (dataRange.y - dataRange.x) * (valueRange.y - valueRange.x) +
                                valueRange.x);
      }
      
      template <typename T>
      T mapFromValueToData(T val) const {
          return static_cast<T>((static_cast<double>(val) - valueRange.x) /
                                    (valueRange.y - valueRange.x) * (dataRange.y - dataRange.x) +
                                dataRange.x);
      }
  };
  
  }  // namespace
  
  #endif  // IVW_DATAMAPPER_H
  