qgsrastertransparency.h

一个非常好的GIS开源新版本

/* **************************************************************************
                qgsrastertransparency.h -  description
                       -------------------
begin                : Mon Nov 30 2007
copyright            : (C) 2007 by Peter J. Ersts
email                : [e-mail]

****************************************************************************/

/* **************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSRASTERTRANSPARENCY_H
#define QGSRASTERTRANSPARENCY_H

class CORE_EXPORT QgsRasterTransparency
{

  public:
    QgsRasterTransparency();
    
    //
    // Structs to hold transparent pixel vlaues
    //
    struct TransparentThreeValuePixel
    {
      double red;
      double green;
      double blue;
      double percentTransparent;
    };

    struct TransparentSingleValuePixel
    {
      double pixelValue;
      double percentTransparent;
    };
    
    //
    // Initializer, Accessor and mutator for transparency tables.
    //
    /** \brief Mutator for transparentSingleValuePixelList */
    QList<QgsRasterTransparency::TransparentSingleValuePixel> getTransparentSingleValuePixelList();
    
    /** \brief Mutator for transparentThreeValuePixelList */
    QList<QgsRasterTransparency::TransparentThreeValuePixel> getTransparentThreeValuePixelList();
    
    /** \brief Reset to the transparency list to a single value */
    void initializeTransparentPixelList(double);
    
    /** \brief Reset to the transparency list to a single value */
    void initializeTransparentPixelList(double, double, double);

    /** \brief Accessor for transparentSingleValuePixelList */
    void setTransparentSingleValuePixelList(QList<QgsRasterTransparency::TransparentSingleValuePixel>);
    
    /** \brief Accessor for transparentThreeValuePixelList */
    void setTransparentThreeValuePixelList(QList<QgsRasterTransparency::TransparentThreeValuePixel>);
    
    /** \brief Returns the transparency value for a single value Pixel */
    int getAlphaValue(double, int theGlobalTransparency=255);
    /** \brief Return the transparency value for a RGB Pixel */
    int getAlphaValue(double, double, double, int theGlobalTransparency=255);
        
  private:
    /** \brief The list to hold transparency values for RGB layers */
    QList<QgsRasterTransparency::TransparentThreeValuePixel> mTransparentThreeValuePixelList;
    /** \brief The lsit to hold transparency values for single value pixel layers */
    QList<QgsRasterTransparency::TransparentSingleValuePixel> mTransparentSingleValuePixelList;

};
#endif