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Tip revision: 549273bb6f277049d76a2e33736aff45c12c0595 authored by Lars Bilke on 08 March 2021, 11:28:13 UTC
Merge branch 'cpm-conan' into 'master'
Merge branch 'cpm-conan' into 'master'
Tip revision: 549273b
MathTools.cpp
/**
* \file
* \copyright
* Copyright (c) 2012-2021, OpenGeoSys Community (http://www.opengeosys.org)
* Distributed under a Modified BSD License.
* See accompanying file LICENSE.txt or
* http://www.opengeosys.org/project/license
*/
#include "MathTools.h"
#include <Eigen/Dense>
#include <cmath>
#include "Point3d.h"
namespace MathLib
{
double calcProjPntToLineAndDists(Point3d const& pp, Point3d const& pa,
Point3d const& pb, double& lambda, double& d0)
{
auto const a = Eigen::Map<Eigen::Vector3d const>(pa.getCoords());
auto const b = Eigen::Map<Eigen::Vector3d const>(pb.getCoords());
auto const p = Eigen::Map<Eigen::Vector3d const>(pp.getCoords());
// g(lambda) = a + lambda v, v = b-a
Eigen::Vector3d const v = b - a;
// orthogonal projection: (p - g(lambda))^T * v = 0
// <=> (a-p - lambda (b-a))^T * (b-a) = 0
// <=> (a-p)^T * (b-a) = lambda (b-a)^T ) (b-a)
lambda = (((p - a).transpose() * v) / v.squaredNorm())(0, 0);
// compute projected point
Eigen::Vector3d const proj_pnt = a + lambda * v;
d0 = (proj_pnt - a).norm();
return (p - proj_pnt).norm();
}
double getAngle(Point3d const& p0, Point3d const& p1, Point3d const& p2)
{
auto const a = Eigen::Map<Eigen::Vector3d const>(p0.getCoords());
auto const b = Eigen::Map<Eigen::Vector3d const>(p1.getCoords());
auto const c = Eigen::Map<Eigen::Vector3d const>(p2.getCoords());
Eigen::Vector3d const v0 = a - b;
Eigen::Vector3d const v1 = c - b;
// apply Cauchy Schwarz inequality
return std::acos(v0.dot(v1) / (v0.norm() * v1.norm()));
}
} // namespace MathLib