C++ (Cpp) QgsSimplifyMethod::methodType示例

示例#1

文件： qgsogrfeatureiterator.cpp 项目： Alvlivan/QGIS

bool QgsOgrFeatureIterator::prepareSimplification( const QgsSimplifyMethod& simplifyMethod )
{
  delete mGeometrySimplifier;
  mGeometrySimplifier = NULL;

  // setup simplification of OGR-geometries fetched
  if ( !( mRequest.flags() & QgsFeatureRequest::NoGeometry ) && simplifyMethod.methodType() != QgsSimplifyMethod::NoSimplification && !simplifyMethod.forceLocalOptimization() )
  {
    QgsSimplifyMethod::MethodType methodType = simplifyMethod.methodType();
    Q_UNUSED( methodType );

#if defined(GDAL_VERSION_NUM) && defined(GDAL_COMPUTE_VERSION)
#if GDAL_VERSION_NUM >= GDAL_COMPUTE_VERSION(1,11,0)
    if ( methodType == QgsSimplifyMethod::OptimizeForRendering )
    {
      int simplifyFlags = QgsMapToPixelSimplifier::SimplifyGeometry | QgsMapToPixelSimplifier::SimplifyEnvelope;
      mGeometrySimplifier = new QgsOgrMapToPixelSimplifier( simplifyFlags, simplifyMethod.tolerance() );
      return true;
    }
#endif
#endif
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1900
    if ( methodType == QgsSimplifyMethod::PreserveTopology )
    {
      mGeometrySimplifier = new QgsOgrTopologyPreservingSimplifier( simplifyMethod.tolerance() );
      return true;
    }
#endif

    QgsDebugMsg( QString( "Simplification method type (%1) is not recognised by OgrFeatureIterator class" ).arg( methodType ) );
  }
  return QgsAbstractFeatureIterator::prepareSimplification( simplifyMethod );
}

示例#2

文件： qgspostgresfeatureiterator.cpp 项目： nicanor-b/QGIS

bool QgsPostgresFeatureIterator::prepareSimplification( const QgsSimplifyMethod& simplifyMethod )
{
    // setup simplification of geometries to fetch
    if ( !( mRequest.flags() & QgsFeatureRequest::NoGeometry ) &&
            simplifyMethod.methodType() != QgsSimplifyMethod::NoSimplification &&
            !simplifyMethod.forceLocalOptimization() )
    {
        QgsSimplifyMethod::MethodType methodType = simplifyMethod.methodType();

        if ( methodType == QgsSimplifyMethod::OptimizeForRendering || methodType == QgsSimplifyMethod::PreserveTopology )
        {
            return true;
        }
        else
        {
            QgsDebugMsg( QString( "Simplification method type (%1) is not recognised by PostgresFeatureIterator" ).arg( methodType ) );
        }
    }
    return QgsAbstractFeatureIterator::prepareSimplification( simplifyMethod );
}

示例#3

文件： qgsvectorlayerfeatureiterator.cpp 项目： AnAvidDeveloper/QGIS

bool QgsVectorLayerFeatureIterator::prepareSimplification( const QgsSimplifyMethod& simplifyMethod )
{
  delete mEditGeometrySimplifier;
  mEditGeometrySimplifier = NULL;

  // setup simplification for edited geometries to fetch
  if ( !( mRequest.flags() & QgsFeatureRequest::NoGeometry ) && simplifyMethod.methodType() != QgsSimplifyMethod::NoSimplification && L->hasGeometryType() && L->geometryType() != QGis::Point )
  {
    mEditGeometrySimplifier = QgsSimplifyMethod::createGeometrySimplifier( simplifyMethod );
    return mEditGeometrySimplifier != NULL;
  }
  return false;
}

示例#4

文件： qgsfeatureiterator.cpp 项目： Aladar64/QGIS

bool QgsAbstractFeatureIterator::prepareSimplification( const QgsSimplifyMethod& simplifyMethod )
{
  mLocalSimplification = false;

  delete mGeometrySimplifier;
  mGeometrySimplifier = NULL;

  // setup the simplification of geometries to fetch
  if ( !( mRequest.flags() & QgsFeatureRequest::NoGeometry ) && simplifyMethod.methodType() != QgsSimplifyMethod::NoSimplification && ( simplifyMethod.forceLocalOptimization() || !providerCanSimplify( simplifyMethod.methodType() ) ) )
  {
    mGeometrySimplifier = QgsSimplifyMethod::createGeometrySimplifier( simplifyMethod );
    mLocalSimplification = mGeometrySimplifier != NULL;
    return mLocalSimplification;
  }
  return false;
}