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QhullHyperplane.cpp
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Thu, Jul 10, 03:38

QhullHyperplane.cpp
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/****************************************************************************
**
** Copyright (C) 2009-2010 C.B. Barber. All rights reserved.
** $Id: //main/2011/qhull/src/libqhullcpp/QhullHyperplane.cpp#2 $$Change: 1341 $
** $DateTime: 2011/03/07 21:13:54 $$Author: bbarber $
**
****************************************************************************/
#include "QhullHyperplane.h"
#include "QhullPoint.h"
#include <iostream>
#ifdef _MSC_VER // Microsoft Visual C++ -- warning level 4
#endif
namespace orgQhull {
#//Conversion
// 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
#//Value
//! Return distance from point to hyperplane.
//! If greater than zero, the point is above the facet (i.e., outside).
// qh_distplane [geom.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::
norm() const {
double d= 0.0;
const coordT *c= coordinates();
for (int k=dimension(); k--; ){
d += *c * *c;
++c;
}
return sqrt(d);
}//norm
#//Operator
bool QhullHyperplane::
operator==(const QhullHyperplane &other) const
{
if(hyperplane_dimension!=other.hyperplane_dimension){
return false;
}
double d= fabs(hyperplane_offset-other.hyperplane_offset);
if(d>UsingLibQhull::globalDistanceEpsilon()){
return false;
}
const coordT *c= hyperplane_coordinates;
const coordT *c2= other.hyperplane_coordinates;
if(c==c2){
return true;
}
double dist2= 0.0;
for(int k= hyperplane_dimension; k--; ){
double diff= *c++ - *c2++;
dist2 += diff*diff;
}
if(dist2 > UsingLibQhull::globalAngleEpsilon()){
return false;
}
return true;
}//operator==
#//GetSet
}//namespace orgQhull
#//Global functions
using std::ostream;
using orgQhull::QhullHyperplane;
using orgQhull::UsingLibQhull;
#//operator<<
ostream &
operator<<(ostream &os, const QhullHyperplane &p)
{
os << p.print();
return os;
}
ostream &
operator<<(ostream &os, const QhullHyperplane::PrintHyperplane &pr)
{
QhullHyperplane p= *pr.hyperplane;
if(pr.hyperplane_message){
os << pr.hyperplane_message;
}
const realT *c= p.coordinates();
for(int k=p.dimension(); k--; ){
realT r= *c++;
if(pr.hyperplane_message){
os << " " << r; // FIXUP QH11010 %8.4g
}else{
os << " " << r; // FIXUP QH11010 qh_REAL_1
}
}
if(pr.hyperplane_offset_message){
os << pr.hyperplane_offset_message << " " << p.offset();
}else{
os << " " << p.offset();
}
os << std::endl;
return os;
}//PrintHyperplane

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