edge_se2.cpp

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// g2o - General Graph Optimization
// Copyright (C) 2011 R. Kuemmerle, G. Grisetti, W. Burgard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the
//   documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
#include "edge_se2.h"
 
#ifdef G2O_HAVE_OPENGL
#include "g2o/stuff/opengl_primitives.h"
#include "g2o/stuff/opengl_wrapper.h"
#endif
 
namespace g2o {
 
EdgeSE2::EdgeSE2() : BaseBinaryEdge<3, SE2, VertexSE2, VertexSE2>() {}
 
bool EdgeSE2::read(std::istream& is) {
  Vector3 p;
  internal::readVector(is, p);
  setMeasurement(SE2(p));
  _inverseMeasurement = measurement().inverse();
  readInformationMatrix(is);
  return is.good() || is.eof();
}
 
bool EdgeSE2::write(std::ostream& os) const {
  internal::writeVector(os, measurement().toVector());
  return writeInformationMatrix(os);
}
 
void EdgeSE2::initialEstimate(const OptimizableGraph::VertexSet& from,
                              OptimizableGraph::Vertex* /* to */) {
  VertexSE2* fromEdge = static_cast<VertexSE2*>(_vertices[0]);
  VertexSE2* toEdge = static_cast<VertexSE2*>(_vertices[1]);
  if (from.count(fromEdge) > 0)
    toEdge->setEstimate(fromEdge->estimate() * _measurement);
  else
    fromEdge->setEstimate(toEdge->estimate() * _inverseMeasurement);
}
 
#ifndef NUMERIC_JACOBIAN_TWO_D_TYPES
void EdgeSE2::linearizeOplus() {
  const VertexSE2* vi = static_cast<const VertexSE2*>(_vertices[0]);
  const VertexSE2* vj = static_cast<const VertexSE2*>(_vertices[1]);
  double thetai = vi->estimate().rotation().angle();
 
  Vector2 dt = vj->estimate().translation() - vi->estimate().translation();
  double si = std::sin(thetai), ci = std::cos(thetai);
 
  _jacobianOplusXi << -ci, -si, -si * dt.x() + ci * dt.y(), si, -ci,
      -ci * dt.x() - si * dt.y(), 0, 0, -1;
 
  _jacobianOplusXj << ci, si, 0, -si, ci, 0, 0, 0, 1;
 
  const SE2& rmean = _inverseMeasurement;
  Matrix3 z;
  z.block<2, 2>(0, 0) = rmean.rotation().toRotationMatrix();
  z.col(2) << cst(0.), cst(0.), cst(1.);
  z.row(2).head<2>() << cst(0.), cst(0.);
  _jacobianOplusXi = z * _jacobianOplusXi;
  _jacobianOplusXj = z * _jacobianOplusXj;
}
#endif
 
EdgeSE2WriteGnuplotAction::EdgeSE2WriteGnuplotAction()
    : WriteGnuplotAction(typeid(EdgeSE2).name()) {}
 
HyperGraphElementAction* EdgeSE2WriteGnuplotAction::operator()(
    HyperGraph::HyperGraphElement* element,
    HyperGraphElementAction::Parameters* params_) {
  if (typeid(*element).name() != _typeName) return nullptr;
  WriteGnuplotAction::Parameters* params =
      static_cast<WriteGnuplotAction::Parameters*>(params_);
  if (!params->os) {
    return nullptr;
  }
 
  EdgeSE2* e = static_cast<EdgeSE2*>(element);
  VertexSE2* fromEdge = static_cast<VertexSE2*>(e->vertex(0));
  VertexSE2* toEdge = static_cast<VertexSE2*>(e->vertex(1));
  *(params->os) << fromEdge->estimate().translation().x() << " "
                << fromEdge->estimate().translation().y() << " "
                << fromEdge->estimate().rotation().angle() << std::endl;
  *(params->os) << toEdge->estimate().translation().x() << " "
                << toEdge->estimate().translation().y() << " "
                << toEdge->estimate().rotation().angle() << std::endl;
  *(params->os) << std::endl;
  return this;
}
 
#ifdef G2O_HAVE_OPENGL
EdgeSE2DrawAction::EdgeSE2DrawAction()
    : DrawAction(typeid(EdgeSE2).name()),
      _triangleX(nullptr),
      _triangleY(nullptr) {}
 
bool EdgeSE2DrawAction::refreshPropertyPtrs(
    HyperGraphElementAction::Parameters* params_) {
  if (!DrawAction::refreshPropertyPtrs(params_)) return false;
  if (_previousParams) {
    _triangleX = _previousParams->makeProperty<FloatProperty>(
        _typeName + "::GHOST_TRIANGLE_X", .2f);
    _triangleY = _previousParams->makeProperty<FloatProperty>(
        _typeName + "::GHOST_TRIANGLE_Y", .05f);
  } else {
    _triangleX = 0;
    _triangleY = 0;
  }
  return true;
}
 
HyperGraphElementAction* EdgeSE2DrawAction::operator()(
    HyperGraph::HyperGraphElement* element,
    HyperGraphElementAction::Parameters* params_) {
  if (typeid(*element).name() != _typeName) return nullptr;
 
  refreshPropertyPtrs(params_);
  if (!_previousParams) return this;
 
  if (_show && !_show->value()) return this;
 
  EdgeSE2* e = static_cast<EdgeSE2*>(element);
  VertexSE2* from = static_cast<VertexSE2*>(e->vertex(0));
  VertexSE2* to = static_cast<VertexSE2*>(e->vertex(1));
  if (!from && !to) return this;
  SE2 fromTransform;
  SE2 toTransform;
  glPushAttrib(GL_ENABLE_BIT | GL_LIGHTING | GL_COLOR);
  glDisable(GL_LIGHTING);
  if (!from) {
    glColor3f(POSE_EDGE_GHOST_COLOR);
    toTransform = to->estimate();
    fromTransform = to->estimate() * e->measurement().inverse();
    // DRAW THE FROM EDGE AS AN ARROW
    glPushMatrix();
    glTranslatef((float)fromTransform.translation().x(),
                 (float)fromTransform.translation().y(), 0.f);
    glRotatef((float)RAD2DEG(fromTransform.rotation().angle()), 0.f, 0.f, 1.f);
    opengl::drawArrow2D((float)_triangleX->value(), (float)_triangleY->value(),
                        (float)_triangleX->value() * .3f);
    glPopMatrix();
  } else if (!to) {
    glColor3f(POSE_EDGE_GHOST_COLOR);
    fromTransform = from->estimate();
    toTransform = from->estimate() * e->measurement();
    // DRAW THE TO EDGE AS AN ARROW
    glPushMatrix();
    glTranslatef(toTransform.translation().x(), toTransform.translation().y(),
                 0.f);
    glRotatef((float)RAD2DEG(toTransform.rotation().angle()), 0.f, 0.f, 1.f);
    opengl::drawArrow2D((float)_triangleX->value(), (float)_triangleY->value(),
                        (float)_triangleX->value() * .3f);
    glPopMatrix();
  } else {
    glColor3f(POSE_EDGE_COLOR);
    fromTransform = from->estimate();
    toTransform = to->estimate();
  }
  glBegin(GL_LINES);
  glVertex3f((float)fromTransform.translation().x(),
             (float)fromTransform.translation().y(), 0.f);
  glVertex3f((float)toTransform.translation().x(),
             (float)toTransform.translation().y(), 0.f);
  glEnd();
  glPopAttrib();
  return this;
}
#endif
 
}  // namespace g2o