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QhullHyperplane.cpp
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Tue, Jul 30, 16:13

QhullHyperplane.cpp
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/****************************************************************************
**
** Copyright (c) 2009-2015 C.B. Barber. All rights reserved.
** $Id: //main/2015/qhull/src/libqhullcpp/QhullHyperplane.cpp#3 $$Change: 2066 $
** $DateTime: 2016/01/18 19:29:17 $$Author: bbarber $
**
****************************************************************************/
#include "libqhullcpp/QhullHyperplane.h"
#include "libqhullcpp/Qhull.h"
#include "libqhullcpp/QhullPoint.h"
#include <iostream>
#ifdef _MSC_VER // Microsoft Visual C++ -- warning level 4
#endif
namespace orgQhull {
#//!\name Constructors
QhullHyperplane::
QhullHyperplane(const Qhull &q)
: hyperplane_coordinates(0)
, qh_qh(q.qh())
, hyperplane_offset(0.0)
, hyperplane_dimension(0)
{
}
QhullHyperplane::
QhullHyperplane(const Qhull &q, int hyperplaneDimension, coordT *c, coordT hyperplaneOffset)
: hyperplane_coordinates(c)
, qh_qh(q.qh())
, hyperplane_offset(hyperplaneOffset)
, hyperplane_dimension(hyperplaneDimension)
{
}
#//!\name Conversions
// See qt-qhull.cpp for QList conversions
#ifndef QHULL_NO_STL
std::vector<coordT> QhullHyperplane::
toStdVector() const
{
QhullHyperplaneIterator i(*this);
std::vector<coordT> fs;
while(i.hasNext()){
fs.push_back(i.next());
}
fs.push_back(hyperplane_offset);
return fs;
}//toStdVector
#endif //QHULL_NO_STL
#//!\name GetSet
//! Return true if equal
//! If qh_qh defined, tests qh.distanceEpsilon and qh.angleEpsilon
//! otherwise, tests equal coordinates and offset
bool QhullHyperplane::
operator==(const QhullHyperplane &other) const
{
if(hyperplane_dimension!=other.hyperplane_dimension || !hyperplane_coordinates || !other.hyperplane_coordinates){
return false;
}
double d= fabs(hyperplane_offset-other.hyperplane_offset);
if(d > (qh_qh ? qh_qh->distanceEpsilon() : 0.0)){
return false;
}
double angle= hyperplaneAngle(other);
double a= fabs(angle-1.0);
if(a > (qh_qh ? qh_qh->angleEpsilon() : 0.0)){
return false;
}
return true;
}//operator==
#//!\name Methods
//! Return distance from point to hyperplane.
//! If greater than zero, the point is above the facet (i.e., outside).
// qh_distplane [geom_r.c], QhullFacet::distance, and QhullHyperplane::distance are copies
// Does not support RANDOMdist or logging
double QhullHyperplane::
distance(const QhullPoint &p) const
{
const coordT *point= p.coordinates();
int dim= p.dimension();
QHULL_ASSERT(dim==dimension());
const coordT *normal= coordinates();
double dist;
switch (dim){
case 2:
dist= offset() + point[0] * normal[0] + point[1] * normal[1];
break;
case 3:
dist= offset() + point[0] * normal[0] + point[1] * normal[1] + point[2] * normal[2];
break;
case 4:
dist= offset()+point[0]*normal[0]+point[1]*normal[1]+point[2]*normal[2]+point[3]*normal[3];
break;
case 5:
dist= offset()+point[0]*normal[0]+point[1]*normal[1]+point[2]*normal[2]+point[3]*normal[3]+point[4]*normal[4];
break;
case 6:
dist= offset()+point[0]*normal[0]+point[1]*normal[1]+point[2]*normal[2]+point[3]*normal[3]+point[4]*normal[4]+point[5]*normal[5];
break;
case 7:
dist= offset()+point[0]*normal[0]+point[1]*normal[1]+point[2]*normal[2]+point[3]*normal[3]+point[4]*normal[4]+point[5]*normal[5]+point[6]*normal[6];
break;
case 8:
dist= offset()+point[0]*normal[0]+point[1]*normal[1]+point[2]*normal[2]+point[3]*normal[3]+point[4]*normal[4]+point[5]*normal[5]+point[6]*normal[6]+point[7]*normal[7];
break;
default:
dist= offset();
for (int k=dim; k--; )
dist += *point++ * *normal++;
break;
}
return dist;
}//distance
double QhullHyperplane::
hyperplaneAngle(const QhullHyperplane &other) const
{
volatile realT result= 0.0;
QH_TRY_(qh_qh){ // no object creation -- destructors skipped on longjmp()
result= qh_getangle(qh_qh, hyperplane_coordinates, other.hyperplane_coordinates);
}
qh_qh->NOerrexit= true;
qh_qh->maybeThrowQhullMessage(QH_TRY_status);
return result;
}//hyperplaneAngle
double QhullHyperplane::
norm() const {
double d= 0.0;
const coordT *c= coordinates();
for (int k=dimension(); k--; ){
d += *c * *c;
++c;
}
return sqrt(d);
}//norm
}//namespace orgQhull
#//!\name Global functions
using std::ostream;
using orgQhull::QhullHyperplane;
#//!\name GetSet<<
ostream &
operator<<(ostream &os, const QhullHyperplane &p)
{
os << p.print("");
return os;
}
ostream &
operator<<(ostream &os, const QhullHyperplane::PrintHyperplane &pr)
{
os << pr.print_message;
QhullHyperplane p= *pr.hyperplane;
const realT *c= p.coordinates();
for(int k=p.dimension(); k--; ){
realT r= *c++;
if(pr.print_message){
os << " " << r; // FIXUP QH11010 %8.4g
}else{
os << " " << r; // FIXUP QH11010 qh_REAL_1
}
}
os << pr.hyperplane_offset_message << " " << p.offset();
os << std::endl;
return os;
}//PrintHyperplane

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