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Field.h

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// $Header: /nfs/slac/g/glast/ground/cvs/gismo/gismo/Field.h,v 1.2 2000/01/17 23:37:18 burnett Exp $


#ifndef GISMO_FIELD_H
#define GISMO_FIELD_H

#include "geometry/Point.h"

#include <vector>
class Ray;

class Field
{
protected:

   Vector constB;
   // the value of the constant field

   unsigned int id;
   // a unique identifier for I/O

 public:
   Field();
   Field(double,double,double);
   Field(const Vector & );
   // constructors

   virtual ~Field() {}

   virtual const Vector& valueAt(const Vector& r)const {return constB;}
   void setConstField( Vector& B) {constB = B;}
   const char* nameOf() const { return "Field"; }

   Ray* CreateRay(const Point&, const Vector&, float, float=0)const;

    //   Methods associated with GUI and Printing
    virtual void printOn( std::ostream& os = std::cout ) const;


    typedef std::vector<Field*> Field_list;
    static Field_list theFields;
    // a list of unique field objects

protected:

   void checkAppend();
   // add the current Field to the FieldList if it is unique

};

#endif

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