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/**********************************************************************
* $Id: Triangle.cpp,v 1.3 2004/07/02 13:28:26 strk Exp $
*
* GEOS - Geometry Engine Open Source
* http://geos.refractions.net
*
* Copyright (C) 2001-2002 Vivid Solutions Inc.
*
* This is free software; you can redistribute and/or modify it under
* the terms of the GNU Lesser General Public Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
**********************************************************************
* $Log: Triangle.cpp,v $
* Revision 1.3 2004/07/02 13:28:26 strk
* Fixed all #include lines to reflect headers layout change.
* Added client application build tips in README.
*
* Revision 1.2 2004/04/20 08:52:01 strk
* GeometryFactory and Geometry const correctness.
* Memory leaks removed from SimpleGeometryPrecisionReducer
* and GeometryFactory.
*
* Revision 1.1 2004/03/18 10:42:44 ybychkov
* "IO" and "Util" upgraded to JTS 1.4
* "Geometry" partially upgraded.
*
*
**********************************************************************/
#include <geos/geom.h>
#include <stdio.h>
namespace geos {
Triangle::Triangle(const Coordinate& nP0,const Coordinate& nP1,const Coordinate& nP2) {
p0=nP0;
p1=nP1;
p2=nP2;
}
/**
* The inCentre of a triangle is the point which is equidistant
* from the sides of the triangle. This is also the point at which the bisectors
* of the angles meet.
*
* @return the point which is the inCentre of the triangle
*/
Coordinate* Triangle::inCentre() {
// the lengths of the sides, labelled by their opposite vertex
double len0 = p1.distance(p2);
double len1 = p0.distance(p2);
double len2 = p0.distance(p1);
double circum = len0 + len1 + len2;
double inCentreX = (len0 * p0.x + len1 * p1.x +len2 * p2.x) / circum;
double inCentreY = (len0 * p0.y + len1 * p1.y +len2 * p2.y) / circum;
return new Coordinate(inCentreX, inCentreY);
}
}
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