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UsingLibQhull.h
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UsingLibQhull.h
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/****************************************************************************
**
** Copyright (C) 2008-2010 C.B. Barber. All rights reserved.
** $Id: //main/2011/qhull/src/libqhullcpp/UsingLibQhull.h#2 $$Change: 1341 $
** $DateTime: 2011/03/07 21:13:54 $$Author: bbarber $
**
****************************************************************************/
#ifndef USINGlibqhull_H
#define USINGlibqhull_H
#include "QhullError.h"
extern "C" {
#include "libqhull/libqhull.h"
};
namespace orgQhull {
#//Types
//! UsingLibQhull -- Interface into libqhull and its 'qh' and 'qhstat' macros
//! Always use with setjmp() for libqhull error handling.
/*******************************
UsingLibQhull is stack based, but as a call
Qhull declarations are stack-based. But can't define a
setjmp environment, since the target goes away. So must be UsingLibQhull, but can only have one
setjmp at a time? Can embedded another Using as long as save/restore
longjmp on exit.
*/
class UsingLibQhull;
// Defined elsewhere
class Qhull;
#// Global variables
extern Qhull *s_qhull_output; //! Provide qh_fprintf (Qhull.cpp) access to Qhull
class UsingLibQhull {
private:
#//Fields
Qhull *my_qhull;
int qh_exitcode;
#//Class globals
//! Global flags
static bool s_using_libqhull; //! True if UsingLibQhull is in scope
//! Use global values if s_has_... is set
static bool s_has_angle_epsilon; //! True if s_angle_epsilon defined
static bool s_has_distance_epsilon; //! True if s_distance_epsilon defined
static bool s_has_points; //! If False (default), Qhull() runs setPointBase()
static bool s_has_vertex_dimension; //! True if s_vertex_dimension defined
//! Global values
static double s_angle_epsilon; //! Epsilon for angle equality
static double s_distance_epsilon; //! Epsilon for distance equality
static const coordT *s_points_begin; //! For QhullPoint::id() w/o qhRunId.
static const coordT *s_points_end; //! For QhullPoint::id() w/o qhRunId.
static int s_points_dimension;
static int s_vertex_dimension; //! Default dimension (e.g., if Vertex::dimension() >= 16)
public:
#//Class constants
static const int NOqhRunId= 0; //! qh_qh is not available
static const int NOthrow= 1; //! Do not throw from maybeThrowQhullMessage
static const int FACTORepsilon= 10; //!
static const double DEFAULTdistanceEpsilon; //! ~DISTround*FACTORepsilon for unit cube
static const double DEFAULTangleEpsilon; //! ~ANGLEround*FACTORepsilon for unit cube
#//Class members
static void checkQhullMemoryEmpty();
static double currentAngleEpsilon();
static double currentDistanceEpsilon();
static const coordT *currentPoints(int *dimension, const coordT **pointsEnd);
static Qhull &currentQhull();
static int currentVertexDimension();
static double globalAngleEpsilon() { return s_has_angle_epsilon ? s_angle_epsilon : currentAngleEpsilon(); }
static double globalDistanceEpsilon() { return s_has_distance_epsilon ? s_distance_epsilon : currentDistanceEpsilon(); }
static double globalMachineEpsilon() { return REALepsilon; }
static const coordT *globalPoints(int *dimension, const coordT **pointsEnd);
static int globalVertexDimension() { return s_has_vertex_dimension ? s_vertex_dimension : currentVertexDimension(); }
static bool hasPoints(); // inline would require Qhull.h
static bool hasVertexDimension();
static void setGlobalAngleEpsilon(double d) { s_angle_epsilon=d; s_has_angle_epsilon= true; }
static void setGlobalDistanceEpsilon(double d) { s_distance_epsilon= d; s_has_distance_epsilon= true; }
static void setGlobalPoints(int dimension, const coordT *pointsBegin, const coordT *pointsEnd) { s_points_dimension= dimension; s_points_begin= pointsBegin; s_points_end= pointsEnd; s_has_points= true; }
static void setGlobalVertexDimension(int i) { s_vertex_dimension= i; s_has_vertex_dimension= true; }
static void setGlobals();
static void unsetGlobalAngleEpsilon() { s_has_angle_epsilon= false; }
static void unsetGlobalDistanceEpsilon() { s_has_distance_epsilon= false; }
static void unsetGlobalPoints() { s_has_points= false; }
static void unsetGlobalVertexDimension() { s_has_vertex_dimension= false; }
static void unsetGlobals();
#//Constructors
UsingLibQhull(Qhull *p);
UsingLibQhull(Qhull *p, int noThrow);
UsingLibQhull(int qhRunId);
~UsingLibQhull();
private: //! disable default constructor, copy constructor, and copy assignment
UsingLibQhull();
UsingLibQhull(const UsingLibQhull &);
UsingLibQhull &operator=(const UsingLibQhull &);
public:
#//Methods
#//Access
bool defined() const { return my_qhull!=0; }
void maybeThrowQhullMessage(int exitCode) const;
void maybeThrowQhullMessage(int exitCode, int noThrow) const;
#//Helpers
private:
QhullError checkRunId() const;
void checkUsingLibQhull() const;
/***********************************
You may use global variables in 'qh' after declaring UsingLibQhull. For example
UsingLibQhull q(qhRunId);
// NOerrors -- no calls that throw libqhull errors
cout << "Delaunay Mode: " << qh DELAUNAY;
To trap errors from libqhull, UsingLibQhull must be followed by
UsingLibQhull q(qhRunId);
int exitCode = setjmp(qh errexit);
if(!exitCode){ // no object creation -- destructors skipped on longjmp()
calls to libqhull
}
q.maybeThrowQhullMessage(exitCode);
The call to setjmp() can not be moved to a method. The stack must be preserved for error exits from libqhull.
*/
};//UsingLibQhull
}//namespace orgQhull
#endif // USINGlibqhull_H

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