C++ QgsVectorLayer::addRing方法代码示例

void QgsMapToolFillRing::cadCanvasReleaseEvent( QgsMapMouseEvent * e )
{
  //check if we operate on a vector layer
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mCanvas->currentLayer() );

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  //add point to list and to rubber band
  if ( e->button() == Qt::LeftButton )
  {
    int error = addVertex( e->mapPoint() );
    if ( error == 1 )
    {
      //current layer is not a vector layer
      return;
    }
    else if ( error == 2 )
    {
      //problem with coordinate transformation
      emit messageEmitted( tr( "Cannot transform the point to the layers coordinate system" ), QgsMessageBar::WARNING );
      return;
    }

    startCapturing();
  }
  else if ( e->button() == Qt::RightButton )
  {
    if ( !isCapturing() )
      return;

    deleteTempRubberBand();

    closePolygon();

    vlayer->beginEditCommand( tr( "Ring added and filled" ) );
    QList< QgsPoint > pointList = points();

    QgsFeatureId modifiedFid;
    int addRingReturnCode = vlayer->addRing( pointList, &modifiedFid );
    if ( addRingReturnCode != 0 )
    {
      QString errorMessage;
      //todo: open message box to communicate errors
      if ( addRingReturnCode == 1 )
      {
        errorMessage = tr( "a problem with geometry type occured" );
      }
      else if ( addRingReturnCode == 2 )
      {
        errorMessage = tr( "the inserted Ring is not closed" );
      }
      else if ( addRingReturnCode == 3 )
      {
        errorMessage = tr( "the inserted Ring is not a valid geometry" );
      }
      else if ( addRingReturnCode == 4 )
      {
        errorMessage = tr( "the inserted Ring crosses existing rings" );
      }
      else if ( addRingReturnCode == 5 )
      {
        errorMessage = tr( "the inserted Ring is not contained in a feature" );
      }
      else
      {
        errorMessage = tr( "an unknown error occured" );
      }
      emit messageEmitted( tr( "could not add ring since %1." ).arg( errorMessage ), QgsMessageBar::CRITICAL );
      vlayer->destroyEditCommand();
    }
    else
    {
      // find parent feature and get it attributes
      double xMin, xMax, yMin, yMax;
      QgsRectangle bBox;

      xMin = std::numeric_limits<double>::max();
      xMax = -std::numeric_limits<double>::max();
      yMin = std::numeric_limits<double>::max();
      yMax = -std::numeric_limits<double>::max();

      Q_FOREACH ( const QgsPoint& point, pointList )
      {
        xMin = qMin( xMin, point.x() );
        xMax = qMax( xMax, point.x() );
        yMin = qMin( yMin, point.y() );
        yMax = qMax( yMax, point.y() );
      }

      bBox.setXMinimum( xMin );
//.........这里部分代码省略.........

void QgsMapToolAddRing::canvasReleaseEvent( QMouseEvent * e )
{

  emit messageDiscarded();

  //check if we operate on a vector layer
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mCanvas->currentLayer() );

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  //add point to list and to rubber band
  if ( e->button() == Qt::LeftButton )
  {
    int error = addVertex( e->pos() );
    if ( error == 1 )
    {
      //current layer is not a vector layer
      return;
    }
    else if ( error == 2 )
    {
      //problem with coordinate transformation
      emit messageEmitted( tr( "Cannot transform the point to the layers coordinate system" ), QgsMessageBar::WARNING );
      return;
    }

    startCapturing();
  }
  else if ( e->button() == Qt::RightButton )
  {
    if ( !isCapturing() )
      return;

    deleteTempRubberBand();

    closePolygon();

    vlayer->beginEditCommand( tr( "Ring added" ) );
    int addRingReturnCode = vlayer->addRing( points() );
    if ( addRingReturnCode != 0 )
    {
      QString errorMessage;
      //todo: open message box to communicate errors
      if ( addRingReturnCode == 1 )
      {
        errorMessage = tr( "a problem with geometry type occured" );
      }
      else if ( addRingReturnCode == 2 )
      {
        errorMessage = tr( "the inserted ring is not closed" );
      }
      else if ( addRingReturnCode == 3 )
      {
        errorMessage = tr( "the inserted ring is not a valid geometry" );
      }
      else if ( addRingReturnCode == 4 )
      {
        errorMessage = tr( "the inserted ring crosses existing rings" );
      }
      else if ( addRingReturnCode == 5 )
      {
        errorMessage = tr( "the inserted ring is not contained in a feature" );
      }
      else
      {
        errorMessage = tr( "an unknown error occured" );
      }
      emit messageEmitted( tr( "could not add ring since %1." ).arg( errorMessage ), QgsMessageBar::CRITICAL );
      vlayer->destroyEditCommand();
    }
    else
    {
      vlayer->endEditCommand();
    }

    stopCapturing();
  }
}

void QgsMapToolAddRing::cadCanvasReleaseEvent( QgsMapMouseEvent * e )
{

  emit messageDiscarded();

  //check if we operate on a vector layer
  QgsVectorLayer *vlayer = currentVectorLayer();

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  //add point to list and to rubber band
  if ( e->button() == Qt::LeftButton )
  {
    int error = addVertex( e->mapPoint() );
    if ( error == 1 )
    {
      //current layer is not a vector layer
      return;
    }
    else if ( error == 2 )
    {
      //problem with coordinate transformation
      emit messageEmitted( tr( "Cannot transform the point to the layers coordinate system" ), QgsMessageBar::WARNING );
      return;
    }

    startCapturing();
  }
  else if ( e->button() == Qt::RightButton )
  {
    if ( !isCapturing() )
      return;

    deleteTempRubberBand();

    closePolygon();

    vlayer->beginEditCommand( tr( "Ring added" ) );

    //does compoundcurve contain circular strings?
    //does provider support circular strings?
    bool hasCurvedSegments = captureCurve()->hasCurvedSegments();
    bool providerSupportsCurvedSegments = vlayer->dataProvider()->capabilities() & QgsVectorDataProvider::CircularGeometries;

    QgsCurveV2* curveToAdd = 0;
    if ( hasCurvedSegments && providerSupportsCurvedSegments )
    {
      curveToAdd = dynamic_cast<QgsCurveV2*>( captureCurve()->clone() );
    }
    else
    {
      curveToAdd = captureCurve()->curveToLine();
    }

    int addRingReturnCode = vlayer->addRing( curveToAdd );
    if ( addRingReturnCode != 0 )
    {
      QString errorMessage;
      //todo: open message box to communicate errors
      if ( addRingReturnCode == 1 )
      {
        errorMessage = tr( "a problem with geometry type occured" );
      }
      else if ( addRingReturnCode == 2 )
      {
        errorMessage = tr( "the inserted ring is not closed" );
      }
      else if ( addRingReturnCode == 3 )
      {
        errorMessage = tr( "the inserted ring is not a valid geometry" );
      }
      else if ( addRingReturnCode == 4 )
      {
        errorMessage = tr( "the inserted ring crosses existing rings" );
      }
      else if ( addRingReturnCode == 5 )
      {
        errorMessage = tr( "the inserted ring is not contained in a feature" );
      }
      else
      {
        errorMessage = tr( "an unknown error occured" );
      }
      emit messageEmitted( tr( "could not add ring since %1." ).arg( errorMessage ), QgsMessageBar::CRITICAL );
      vlayer->destroyEditCommand();
    }
    else
    {
      vlayer->endEditCommand();
    }
//.........这里部分代码省略.........

void QgsMapToolFillRing::canvasReleaseEvent( QMouseEvent * e )
{
  //check if we operate on a vector layer
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mCanvas->currentLayer() );

  if ( !vlayer )
  {
    notifyNotVectorLayer();
    return;
  }

  if ( !vlayer->isEditable() )
  {
    notifyNotEditableLayer();
    return;
  }

  //add point to list and to rubber band
  if ( e->button() == Qt::LeftButton )
  {
    int error = addVertex( e->pos() );
    if ( error == 1 )
    {
      //current layer is not a vector layer
      return;
    }
    else if ( error == 2 )
    {
      //problem with coordinate transformation
      QMessageBox::information( 0, tr( "Coordinate transform error" ),
                                tr( "Cannot transform the point to the layers coordinate system" ) );
      return;
    }

    startCapturing();
  }
  else if ( e->button() == Qt::RightButton )
  {
    deleteTempRubberBand();

    closePolygon();

    vlayer->beginEditCommand( tr( "Ring added and filled" ) );
    int addRingReturnCode = vlayer->addRing( points() );
    if ( addRingReturnCode != 0 )
    {
      QString errorMessage;
      //todo: open message box to communicate errors
      if ( addRingReturnCode == 1 )
      {
        errorMessage = tr( "A problem with geometry type occured" );
      }
      else if ( addRingReturnCode == 2 )
      {
        errorMessage = tr( "The inserted Ring is not closed" );
      }
      else if ( addRingReturnCode == 3 )
      {
        errorMessage = tr( "The inserted Ring is not a valid geometry" );
      }
      else if ( addRingReturnCode == 4 )
      {
        errorMessage = tr( "The inserted Ring crosses existing rings" );
      }
      else if ( addRingReturnCode == 5 )
      {
        errorMessage = tr( "The inserted Ring is not contained in a feature" );
      }
      else
      {
        errorMessage = tr( "An unknown error occured" );
      }
      QMessageBox::critical( 0, tr( "Error, could not add ring" ), errorMessage );
      vlayer->destroyEditCommand();
    }
    else
    {
      // find parent feature and get it attributes
      double xMin, xMax, yMin, yMax;
      QgsRectangle bBox;

      xMin = std::numeric_limits<double>::max();
      xMax = -std::numeric_limits<double>::max();
      yMin = std::numeric_limits<double>::max();
      yMax = -std::numeric_limits<double>::max();

      for ( QList<QgsPoint>::const_iterator it = points().constBegin(); it != points().constEnd(); ++it )
      {
        if ( it->x() < xMin )
        {
          xMin = it->x();
        }
        if ( it->x() > xMax )
        {
          xMax = it->x();
        }
        if ( it->y() < yMin )
        {
          yMin = it->y();
        }
//.........这里部分代码省略.........

void QgsMapToolAddRing::canvasReleaseEvent( QMouseEvent * e )
{
  //check if we operate on a vector layer
  QgsVectorLayer *vlayer = dynamic_cast <QgsVectorLayer*>( mCanvas->currentLayer() );

  if ( !vlayer )
  {
    QMessageBox::information( 0, QObject::tr( "Not a vector layer" ),
                              QObject::tr( "The current layer is not a vector layer" ) );
    return;
  }

  if ( !vlayer->isEditable() )
  {
    QMessageBox::information( 0, QObject::tr( "Layer not editable" ),
                              QObject::tr( "Cannot edit the vector layer. To make it editable, go to the file item "
                                           "of the layer, right click and check 'Allow Editing'." ) );
    return;
  }

  //add point to list and to rubber band
  int error = addVertex( e->pos() );
  if ( error == 1 )
  {
    //current layer is not a vector layer
    return;
  }
  else if ( error == 2 )
  {
    //problem with coordinate transformation
    QMessageBox::information( 0, QObject::tr( "Coordinate transform error" ),
                              QObject::tr( "Cannot transform the point to the layers coordinate system" ) );
    return;
  }

  if ( e->button() == Qt::LeftButton )
  {
    mCapturing = TRUE;
  }
  else if ( e->button() == Qt::RightButton )
  {
    mCapturing = FALSE;
    delete mRubberBand;
    mRubberBand = 0;

    //close polygon
    mCaptureList.push_back( *mCaptureList.begin() );

    int addRingReturnCode = vlayer->addRing( mCaptureList );
    if ( addRingReturnCode != 0 )
    {
      QString errorMessage;
      //todo: open message box to communicate errors
      if ( addRingReturnCode == 1 )
      {
        errorMessage = QObject::tr( "A problem with geometry type occured" );
      }
      else if ( addRingReturnCode == 2 )
      {
        errorMessage = QObject::tr( "The inserted Ring is not closed" );
      }
      else if ( addRingReturnCode == 3 )
      {
        errorMessage = QObject::tr( "The inserted Ring is not a valid geometry" );
      }
      else if ( addRingReturnCode == 4 )
      {
        errorMessage = QObject::tr( "The inserted Ring crosses existing rings" );
      }
      else if ( addRingReturnCode == 5 )
      {
        errorMessage = QObject::tr( "The inserted Ring is not contained in a feature" );
      }
      else
      {
        errorMessage = QObject::tr( "An unknown error occured" );
      }
      QMessageBox::critical( 0, QObject::tr( "Error, could not add ring" ), errorMessage );
    }
    mCaptureList.clear();
    mCanvas->refresh();
  }
}