BLWindowShape.hh

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//      BLWindowShape.hh
/*
This source file is part of G4beamline, http://g4beamline.muonsinc.com
Copyright (C) 2003,2004,2005,2006 by Tom Roberts, all rights reserved.

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.

This program 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 General Public License for more details.

http://www.gnu.org/copyleft/gpl.html
*/

#ifndef BLWINDOWSHAPE_HH
#define BLWINDOWSHAPE_HH

#include <vector>
#include "globals.hh"

/**     struct BLWindowShape describes the shape of a window.
 *      This is intended to be used to create a G4PolyCone for the window, 
 *      a G4PolyCone for its contents, and a G4Tubs for the flange and
 *      possibly the pipe to which the flange is bolted (bolts are not 
 *      modeled).
 *
 *      This class may be subclassed to implement other methods of
 *      constructing a window shape.
 *
 *      The standard constructor reads data from filename.
 *      The file format is a series of lines:
 *              First character # means comment, * means printed comment.
 *              Comment and blank lines are ignored. Units are mm.
 *              The first line contains the 4 flange variables:
 *                      innerR outerR insideZ outsideZ
 *              The remaining lines contain 3 values for a given radius:
 *                      r z t
 *              The first line must have r=0.0 and have the largest z value
 *              and the largest z+t value. z is the inside of the window,
 *              z+t is the outside of the window. All values must be positive.
 *              Successive r values must increase by at least 0.010 mm.
 *              Successive z values and z+t values must decrease by at least
 *              0.010 mm.
 *              flangeInnerRadius should equal the last r value.
 *              Any z origin may be used (it will be subtracted away).
 *      This is intended to be easy to interface to window design
 *      spreadsheets (export a list of 3 columns delimited by spaces, then
 *      add the appropriate comments and flange values at the top).
 **/
struct BLWindowShape {
        G4double flangeInnerRadius;     // should be same as last r[] value
        G4double flangeOuterRadius;     // must be larger than flangeInnerRadius
        G4double flangeInsideZ;         // in same Z coords as the window
        G4double flangeOutsideZ;        // in same Z coords as the window
        std::vector<G4double> r;        // first must be 0.0
        std::vector<G4double> z;        // Z coord of inside, first must be 
                                        // largest, and they must decrease
                                        // monotonically by at least 0.010 mm
        std::vector<G4double> t;        // thickness along z
public:
        /// default constructor.
        BLWindowShape() : r(), z(), t() { flangeInnerRadius=0.0;
                flangeOuterRadius=0.0; flangeOutsideZ=0.0; flangeInsideZ=0.0; }

        /// Constructor. Reads directory/filename for the data.
        BLWindowShape(G4String filename);

        /// destructor.
        virtual ~BLWindowShape() { }
};

#endif // BLWINDOWSHAPE_HH