3dpcp/3rdparty/cvblob/cvaux.cpp

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2012-09-16 12:33:11 +00:00
// Copyright (C) 2007 by Cristóbal Carnero Liñán
// grendel.ccl@gmail.com
//
// This file is part of cvBlob.
//
// cvBlob is free software: you can redistribute it and/or modify
// it under the terms of the Lesser GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// cvBlob is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// Lesser GNU General Public License for more details.
//
// You should have received a copy of the Lesser GNU General Public License
// along with cvBlob. If not, see <http://www.gnu.org/licenses/>.
//
#include <cmath>
#if (defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__) || defined(__WINDOWS__) || (defined(__APPLE__) & defined(__MACH__)))
#include <cv.h>
#else
#include <opencv/cv.h>
#endif
#include "cvblob.h"
namespace cvb
{
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
// http://www.topcoder.com/tc?module=Static&d1=tutorials&d2=geometry1
double cvDotProductPoints(CvPoint const &a, CvPoint const &b, CvPoint const &c)
{
double abx = b.x-a.x;
double aby = b.y-a.y;
double bcx = c.x-b.x;
double bcy = c.y-b.y;
return abx*bcx + aby*bcy;
}
double cvCrossProductPoints(CvPoint const &a, CvPoint const &b, CvPoint const &c)
{
double abx = b.x-a.x;
double aby = b.y-a.y;
double acx = c.x-a.x;
double acy = c.y-a.y;
return abx*acy - aby*acx;
}
double cvDistancePointPoint(CvPoint const &a, CvPoint const &b)
{
double abx = a.x-b.x;
double aby = a.y-b.y;
return sqrt(abx*abx + aby*aby);
}
double cvDistanceLinePoint(CvPoint const &a, CvPoint const &b, CvPoint const &c, bool isSegment)
{
if (isSegment)
{
double dot1 = cvDotProductPoints(a, b, c);
if (dot1>0) return cvDistancePointPoint(b, c);
double dot2 = cvDotProductPoints(b, a, c);
if(dot2>0) return cvDistancePointPoint(a, c);
}
return fabs(cvCrossProductPoints(a,b,c)/cvDistancePointPoint(a,b));
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
}