C++ (Cpp) QgsGeometry::deleteRing示例

void QgsMapToolDeleteRing::deleteRing( QgsFeatureId fId, int beforeVertexNr, QgsVectorLayer *vlayer )
{
  QgsFeature f;
  vlayer->getFeatures( QgsFeatureRequest().setFilterFid( fId ) ).nextFeature( f );

  const QgsGeometry g = f.geometry();
  QgsWkbTypes::Type wkbtype = g.wkbType();
  int ringNum, partNum = 0;

  if ( wkbtype == QgsWkbTypes::Polygon || wkbtype == QgsWkbTypes::Polygon25D )
  {
    ringNum = ringNumInPolygon( g, beforeVertexNr );
  }
  else if ( wkbtype == QgsWkbTypes::MultiPolygon || wkbtype == QgsWkbTypes::MultiPolygon25D )
  {
    ringNum = ringNumInMultiPolygon( g, beforeVertexNr, partNum );
  }
  else
    return;

  QgsGeometry editableGeom = f.geometry();
  if ( editableGeom.deleteRing( ringNum, partNum ) )
  {
    vlayer->beginEditCommand( tr( "Ring deleted" ) );
    vlayer->changeGeometry( fId, editableGeom );
    vlayer->endEditCommand();
    vlayer->triggerRepaint();
  }

}

示例#2

显示文件

文件： qgsmaptooldeletering.cpp 项目： kailIII/QGIS

void QgsMapToolDeleteRing::deleteRing( QgsFeatureId fId, int beforeVertexNr, QgsVectorLayer* vlayer )
{
  QgsFeature f;
  vlayer->getFeatures( QgsFeatureRequest().setFilterFid( fId ) ).nextFeature( f );

  QgsGeometry* g = f.geometry();
  QGis::WkbType wkbtype = g->wkbType();
  int ringNum, partNum = 0;

  if ( wkbtype == QGis::WKBPolygon || wkbtype == QGis::WKBPolygon25D )
  {
    ringNum = ringNumInPolygon( g, beforeVertexNr );
  }
  else if ( wkbtype == QGis::WKBMultiPolygon || wkbtype == QGis::WKBMultiPolygon25D )
  {
    ringNum = ringNumInMultiPolygon( g, beforeVertexNr, partNum );
  }
  else
    return;

  if ( g->deleteRing( ringNum, partNum ) )
  {
    vlayer->beginEditCommand( tr( "Ring deleted" ) );
    vlayer->changeGeometry( fId, g );
    vlayer->endEditCommand();
    mCanvas->refresh();
  }

}

示例#3

显示文件

文件： qgsmaptooldeletering.cpp 项目： cayetanobv/QGIS

void QgsMapToolDeleteRing::canvasReleaseEvent( QgsMapMouseEvent *e )
{
  Q_UNUSED( e );

  delete mRubberBand;
  mRubberBand = nullptr;

  if ( mPressedFid == -1 )
    return;

  QgsFeature f;

  vlayer->getFeatures( QgsFeatureRequest().setFilterFid( mPressedFid ) ).nextFeature( f );

  QgsGeometry g = f.geometry();
  if ( g.deleteRing( mPressedRingNum, mPressedPartNum ) )
  {
    vlayer->beginEditCommand( tr( "Ring deleted" ) );
    vlayer->changeGeometry( mPressedFid, g );
    vlayer->endEditCommand();
    vlayer->triggerRepaint();
  }
}