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