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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id: db_utilities_geometry.h,v 1.3 2011/06/17 14:03:31 mbansal Exp $ */
#ifndef DB_UTILITIES_GEOMETRY_H
#define DB_UTILITIES_GEOMETRY_H
#include "db_utilities.h"
/*****************************************************************
* Lean and mean begins here *
*****************************************************************/
/*! Get the inhomogenous 2D-point centroid of nr_point inhomogenous
points in X*/
inline void db_PointCentroid2D(double c[2],const double *X,int nr_points)
{
int i;
double cx,cy,m;
cx=0;cy=0;
for(i=0;i<nr_points;i++)
{
cx+= *X++;
cy+= *X++;
}
if(nr_points)
{
m=1.0/((double)nr_points);
c[0]=cx*m;
c[1]=cy*m;
}
else c[0]=c[1]=0;
}
inline void db_PointCentroid2D(double c[2],const double * const *X,int nr_points)
{
int i;
double cx,cy,m;
const double *temp;
cx=0;cy=0;
for(i=0;i<nr_points;i++)
{
temp= *X++;
cx+=temp[0];
cy+=temp[1];
}
if(nr_points)
{
m=1.0/((double)nr_points);
c[0]=cx*m;
c[1]=cy*m;
}
else c[0]=c[1]=0;
}
/*! Get the inhomogenous 3D-point centroid of nr_point inhomogenous
points in X*/
inline void db_PointCentroid3D(double c[3],const double *X,int nr_points)
{
int i;
double cx,cy,cz,m;
cx=0;cy=0;cz=0;
for(i=0;i<nr_points;i++)
{
cx+= *X++;
cy+= *X++;
cz+= *X++;
}
if(nr_points)
{
m=1.0/((double)nr_points);
c[0]=cx*m;
c[1]=cy*m;
c[2]=cz*m;
}
else c[0]=c[1]=c[2]=0;
}
inline void db_PointCentroid3D(double c[3],const double * const *X,int nr_points)
{
int i;
double cx,cy,cz,m;
const double *temp;
cx=0;cy=0;cz=0;
for(i=0;i<nr_points;i++)
{
temp= *X++;
cx+=temp[0];
cy+=temp[1];
cz+=temp[2];
}
if(nr_points)
{
m=1.0/((double)nr_points);
c[0]=cx*m;
c[1]=cy*m;
c[2]=cz*m;
}
else c[0]=c[1]=c[2]=0;
}
#endif /* DB_UTILITIES_GEOMETRY_H */
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