graphicsconstants.hpp

来自「一个gps小工具包」· HPP 代码 · 共 77 行

/// @file GraphicsConstants.hpp Declares constants. 

//============================================================================
//
//  This file is part of GPSTk, the GPS Toolkit.
//
//  The GPSTk is free software; you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published
//  by the Free Software Foundation; either version 2.1 of the License, or
//  any later version.
//
//  The GPSTk is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with GPSTk; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//  
//  Copyright 2004, The University of Texas at Austin
//
//============================================================================


#ifndef VPLOT_GRAPHIC_CONSTANTS_H
#define VPLOT_GRAPHIC_CONSTANTS_H


namespace vplot
{
   /** \addtogroup BasicVectorGraphics */ 
   //@{
  
   /// The value of pie to 24 decimal places
   extern const double PI;
   /// pi / 180
   extern const double DEGREES_TO_RADIANS; 
   /// 180 / pi
   extern const double RADIANS_TO_DEGREES;

    /// Units conversion from points to inches
    extern const double PTS_PER_INCH;

    /// Units conversion from points to centimeters
    extern const double PTS_PER_CM;

    /// U.S. Customary page size width given in points
    extern const double US_LETTER_WIDTH_PTS;
    /// U.S. Customary page size height given in points
    extern const double US_LETTER_HEIGHT_PTS;

    // For the rest of the world... there's ISO 216-series sizes
    /// A3 page size width given in points
    extern const double A3_WIDTH_PTS;
    /// A3 page size height given in points
    extern const double A3_HEIGHT_PTS;

    // A4 and US customary letter are of comparable size
    /// A4 page size width given in points
    extern const double A4_WIDTH_PTS;
    /// A4 page size height given in points 
    extern const double A4_HEIGHT_PTS;

    /// A5 page size width given in points
    extern const double A5_WIDTH_PTS;
    /// A5 page size height given in points
    extern const double A5_HEIGHT_PTS;

   //@}

} // namespace vplot

#endif //VPLOT_GRAPHIC_CONSTANTS_H