Esempio n. 1
0
double QgsGeometryUtils::distanceToVertex( const QgsAbstractGeometryV2 &geom, const QgsVertexId &id )
{
  double currentDist = 0;
  QgsVertexId vertexId;
  QgsPointV2 vertex;
  QgsPointV2 previousVertex;

  bool first = true;
  while ( geom.nextVertex( vertexId, vertex ) )
  {
    if ( !first )
    {
      currentDist += sqrt( QgsGeometryUtils::sqrDistance2D( previousVertex, vertex ) );
    }

    previousVertex = vertex;
    first = false;

    if ( vertexId == id )
    {
      //found target vertex
      return currentDist;
    }
  }

  //could not find target vertex
  return -1;
}
Esempio n. 2
0
QgsPointV2 QgsGeometryUtils::closestVertex( const QgsAbstractGeometryV2& geom, const QgsPointV2& pt, QgsVertexId& id )
{
  double minDist = std::numeric_limits<double>::max();
  double currentDist = 0;
  QgsPointV2 minDistPoint;

  QgsVertexId vertexId;
  QgsPointV2 vertex;
  while ( geom.nextVertex( vertexId, vertex ) )
  {
    currentDist = QgsGeometryUtils::sqrDistance2D( pt, vertex );
    // The <= is on purpose: for geometries with closing vertices, this ensures
    // that the closing vertex is retuned. For the node tool, the rubberband
    // of the closing vertex is above the opening vertex, hence with the <=
    // situations where the covered opening vertex rubberband is selected are
    // avoided.
    if ( currentDist <= minDist )
    {
      minDist = currentDist;
      minDistPoint = vertex;
      id.part = vertexId.part;
      id.ring = vertexId.ring;
      id.vertex = vertexId.vertex;
    }
  }

  return minDistPoint;
}
void QgsGeometryRubberBand::paint( QPainter* painter )
{
  if ( !mGeometry || !painter )
  {
    return;
  }

  painter->save();
  painter->translate( -pos() );

  if ( mGeometryType == QGis::Polygon )
  {
    painter->setBrush( mBrush );
  }
  else
  {
    painter->setBrush( Qt::NoBrush );
  }
  painter->setPen( mPen );


  QgsAbstractGeometryV2* paintGeom = mGeometry->clone();

  paintGeom->transform( mMapCanvas->getCoordinateTransform()->transform() );
  paintGeom->draw( *painter );

  //draw vertices
  QgsVertexId vertexId;
  QgsPointV2 vertex;
  while ( paintGeom->nextVertex( vertexId, vertex ) )
  {
    drawVertex( painter, vertex.x(), vertex.y() );
  }

  delete paintGeom;
  painter->restore();
}