QgsRectangle QgsRasterCalcDialog::outputRectangle() const
{
  return QgsRectangle( mXMinSpinBox->value(), mYMinSpinBox->value(), mXMaxSpinBox->value(), mYMaxSpinBox->value() );
}

QgsGrassRasterProvider::QgsGrassRasterProvider( QString const &uri )
  : QgsRasterDataProvider( uri )
  , mValid( false )
  , mGrassDataType( 0 )
  , mCols( 0 )
  , mRows( 0 )
  , mYBlockSize( 0 )
  , mNoDataValue( std::numeric_limits<double>::quiet_NaN() )
{
  QgsDebugMsg( "QgsGrassRasterProvider: constructing with uri '" + uri + "'." );

  if ( !QgsGrass::init() )
  {
    return;
  }

  // Parse URI, it is the same like using GDAL, i.e. path to raster cellhd, i.e.
  // /path/to/gisdbase/location/mapset/cellhd/map
  QFileInfo fileInfo( uri );
  if ( !fileInfo.exists() ) // then we keep it valid forever
  {
    appendError( ERR( tr( "cellhd file %1 does not exist" ).arg( uri ) ) );
    return;
  }

  mMapName = fileInfo.fileName();
  QDir dir = fileInfo.dir();
  QString element = dir.dirName();
  if ( element != QLatin1String( "cellhd" ) )
  {
    appendError( ERR( tr( "Groups not yet supported" ) ) );
    return;
  }
  dir.cdUp(); // skip cellhd
  mMapset = dir.dirName();
  dir.cdUp();
  mLocation = dir.dirName();
  dir.cdUp();
  mGisdbase = dir.path();

  QgsDebugMsg( QString( "gisdbase: %1" ).arg( mGisdbase ) );
  QgsDebugMsg( QString( "location: %1" ).arg( mLocation ) );
  QgsDebugMsg( QString( "mapset: %1" ).arg( mMapset ) );
  QgsDebugMsg( QString( "mapName: %1" ).arg( mMapName ) );

  mTimestamp = dataTimestamp();

  mRasterValue.set( mGisdbase, mLocation, mMapset, mMapName );
  //mValidNoDataValue = true;

  QString error;
  mCrs = QgsGrass::crs( mGisdbase, mLocation, error );
  appendIfError( error );
  QgsDebugMsg( "mCrs: " + mCrs.toWkt() );

  // the block size can change of course when the raster is overridden
  // ibut it is only called once when statistics are calculated
  error.clear();
  QgsGrass::size( mGisdbase, mLocation, mMapset, mMapName, &mCols, &mRows, error );
  appendIfError( error );

  error.clear();
  mInfo = QgsGrass::info( mGisdbase, mLocation, mMapset, mMapName, QgsGrassObject::Raster,
                          QStringLiteral( "info" ), QgsRectangle(), 0, 0, 3000, error );
  appendIfError( error );

  mGrassDataType = mInfo[QStringLiteral( "TYPE" )].toInt();
  QgsDebugMsg( "mGrassDataType = " + QString::number( mGrassDataType ) );

  // TODO: avoid showing these strange numbers in GUI
  // TODO: don't save no data values in project file, add a flag if value was defined by user

  double myInternalNoDataValue;
  if ( mGrassDataType == CELL_TYPE )
  {
    myInternalNoDataValue = INT_MIN;
  }
  else if ( mGrassDataType == DCELL_TYPE )
  {
    // Don't use numeric limits, raster layer is using
    //    qAbs( myValue - mNoDataValue ) <= TINY_VALUE
    // if the mNoDataValue would be a limit, the subtraction could overflow.
    // No data value is shown in GUI, use some nice number.
    // Choose values with small representation error.
    // limit: 1.7976931348623157e+308
    //myInternalNoDataValue = -1e+300;
    myInternalNoDataValue = std::numeric_limits<double>::quiet_NaN();
  }
  else
  {
    if ( mGrassDataType != FCELL_TYPE )
    {
      QgsDebugMsg( "unexpected data type" );
    }

    // limit: 3.40282347e+38
    //myInternalNoDataValue = -1e+30;
    myInternalNoDataValue = std::numeric_limits<float>::quiet_NaN();
  }
  mNoDataValue = myInternalNoDataValue;
//.........这里部分代码省略.........

void QgsVectorDataProvider::fillMinMaxCache()
{
  if ( !mCacheMinMaxDirty )
    return;

  const QgsFieldMap& flds = fields();
  for ( QgsFieldMap::const_iterator it = flds.begin(); it != flds.end(); ++it )
  {
    if ( it->type() == QVariant::Int )
    {
      mCacheMinValues[it.key()] = QVariant( INT_MAX );
      mCacheMaxValues[it.key()] = QVariant( INT_MIN );
    }
    else if ( it->type() == QVariant::Double )
    {
      mCacheMinValues[it.key()] = QVariant( DBL_MAX );
      mCacheMaxValues[it.key()] = QVariant( -DBL_MAX );
    }
    else
    {
      mCacheMinValues[it.key()] = QVariant();
      mCacheMaxValues[it.key()] = QVariant();
    }
  }

  QgsFeature f;
  QgsAttributeList keys = mCacheMinValues.keys();
  select( keys, QgsRectangle(), false );

  while ( nextFeature( f ) )
  {
    QgsAttributeMap attrMap = f.attributeMap();
    for ( QgsAttributeList::const_iterator it = keys.begin(); it != keys.end(); ++it )
    {
      const QVariant& varValue = attrMap[*it];

      if ( flds[*it].type() == QVariant::Int )
      {
        int value = varValue.toInt();
        if ( value < mCacheMinValues[*it].toInt() )
          mCacheMinValues[*it] = value;
        if ( value > mCacheMaxValues[*it].toInt() )
          mCacheMaxValues[*it] = value;
      }
      else if ( flds[*it].type() == QVariant::Double )
      {
        double value = varValue.toDouble();
        if ( value < mCacheMinValues[*it].toDouble() )
          mCacheMinValues[*it] = value;
        if ( value > mCacheMaxValues[*it].toDouble() )
          mCacheMaxValues[*it] = value;
      }
      else
      {
        QString value = varValue.toString();
        if ( mCacheMinValues[*it].isNull() || value < mCacheMinValues[*it].toString() )
        {
          mCacheMinValues[*it] = value;
        }
        if ( mCacheMaxValues[*it].isNull() || value > mCacheMaxValues[*it].toString() )
        {
          mCacheMaxValues[*it] = value;
        }
      }
    }
  }

  mCacheMinMaxDirty = false;
}

ErrorList topolTest::runTest( const QString& testName, QgsVectorLayer* layer1, QgsVectorLayer* layer2, ValidateType type, double tolerance )
{
  QgsDebugMsg( QString( "Running test %1" ).arg( testName ) );
  ErrorList errors;

  if ( !layer1 )
  {
    QgsMessageLog::logMessage( tr( "First layer not found in registry." ), tr( "Topology plugin" ) );
    return errors;
  }

  if ( !layer2 && mTopologyRuleMap[testName].useSecondLayer )
  {
    QgsMessageLog::logMessage( tr( "Second layer not found in registry." ), tr( "Topology plugin" ) );
    return errors;
  }

  QString secondLayerId;
  mFeatureList1.clear();
  mFeatureMap2.clear();

  //checking if new features are not
  //being recognised due to indexing not being upto date

  mLayerIndexes.clear();

  if ( mTopologyRuleMap[testName].useSecondLayer )
  {
    // validate all features or current extent
    QgsRectangle extent;
    if ( type == ValidateExtent )
    {
      extent = theQgsInterface->mapCanvas()->extent();
    }
    else
    {
      extent = QgsRectangle();
    }

    fillFeatureList( layer1, extent );
    //fillFeatureMap( layer1, extent );

    QString secondLayerId = layer2->id();

    if ( !mLayerIndexes.contains( layer2->id() ) )
    {
      mLayerIndexes[layer2->id()] = createIndex( layer2, extent );
    }
  }
  else
  {
    // validate all features or current extent
    QgsRectangle extent;
    if ( type == ValidateExtent )
    {
      extent = theQgsInterface->mapCanvas()->extent();
      if ( mTopologyRuleMap[testName].useSpatialIndex )
      {
        mLayerIndexes[layer1->id()] = createIndex( layer1, theQgsInterface->mapCanvas()->extent() );
      }
      else
      {
        fillFeatureList( layer1, extent );
      }
    }
    else
    {
      if ( mTopologyRuleMap[testName].useSpatialIndex )
      {
        if ( !mLayerIndexes.contains( layer1->id() ) )
        {

          mLayerIndexes[layer1->id()] = createIndex( layer1, QgsRectangle() );
        }
      }
      else
      {
        fillFeatureList( layer1, QgsRectangle() );
      }
    }

  }

  //call test routine
  bool isValidatingExtent;
  if ( type == ValidateExtent )
  {
    isValidatingExtent = true;
  }
  else
  {
    isValidatingExtent = false;
  }

  return ( this->*( mTopologyRuleMap[testName].f ) )( tolerance, layer1, layer2, isValidatingExtent );
}

QgsRectangle QgsCoordinateTransform::transformBoundingBox( const QgsRectangle &rect, TransformDirection direction, const bool handle180Crossover ) const
{
  // Calculate the bounding box of a QgsRectangle in the source CRS
  // when projected to the destination CRS (or the inverse).
  // This is done by looking at a number of points spread evenly
  // across the rectangle

  if ( !d->mIsValid || d->mShortCircuit )
    return rect;

  if ( rect.isEmpty() )
  {
    QgsPointXY p = transform( rect.xMinimum(), rect.yMinimum(), direction );
    return QgsRectangle( p, p );
  }

  // 64 points (<=2.12) is not enough, see #13665, for EPSG:4326 -> EPSG:3574 (say that it is a hard one),
  // are decent result from about 500 points and more. This method is called quite often, but
  // even with 1000 points it takes < 1ms
  // TODO: how to effectively and precisely reproject bounding box?
  const int nPoints = 1000;
  double d = std::sqrt( ( rect.width() * rect.height() ) / std::pow( std::sqrt( static_cast< double >( nPoints ) ) - 1, 2.0 ) );
  int nXPoints = static_cast< int >( std::ceil( rect.width() / d ) ) + 1;
  int nYPoints = static_cast< int >( std::ceil( rect.height() / d ) ) + 1;

  QgsRectangle bb_rect;
  bb_rect.setMinimal();

  // We're interfacing with C-style vectors in the
  // end, so let's do C-style vectors here too.

  QVector<double> x( nXPoints * nYPoints );
  QVector<double> y( nXPoints * nYPoints );
  QVector<double> z( nXPoints * nYPoints );

  QgsDebugMsgLevel( QStringLiteral( "Entering transformBoundingBox..." ), 4 );

  // Populate the vectors

  double dx = rect.width()  / static_cast< double >( nXPoints - 1 );
  double dy = rect.height() / static_cast< double >( nYPoints - 1 );

  double pointY = rect.yMinimum();

  for ( int i = 0; i < nYPoints ; i++ )
  {

    // Start at right edge
    double pointX = rect.xMinimum();

    for ( int j = 0; j < nXPoints; j++ )
    {
      x[( i * nXPoints ) + j] = pointX;
      y[( i * nXPoints ) + j] = pointY;
      // and the height...
      z[( i * nXPoints ) + j] = 0.0;
      // QgsDebugMsg(QString("BBox coord: (%1, %2)").arg(x[(i*numP) + j]).arg(y[(i*numP) + j]));
      pointX += dx;
    }
    pointY += dy;
  }

  // Do transformation. Any exception generated must
  // be handled in above layers.
  try
  {
    transformCoords( nXPoints * nYPoints, x.data(), y.data(), z.data(), direction );
  }
  catch ( const QgsCsException & )
  {
    // rethrow the exception
    QgsDebugMsg( QStringLiteral( "rethrowing exception" ) );
    throw;
  }

  // Calculate the bounding box and use that for the extent

  for ( int i = 0; i < nXPoints * nYPoints; i++ )
  {
    if ( !std::isfinite( x[i] ) || !std::isfinite( y[i] ) )
    {
      continue;
    }

    if ( handle180Crossover )
    {
      //if crossing the date line, temporarily add 360 degrees to -ve longitudes
      bb_rect.combineExtentWith( x[i] >= 0.0 ? x[i] : x[i] + 360.0, y[i] );
    }
    else
    {
      bb_rect.combineExtentWith( x[i], y[i] );
    }
  }

  if ( bb_rect.isNull() )
  {
    // something bad happened when reprojecting the filter rect... no finite points were left!
    throw QgsCsException( QObject::tr( "Could not transform bounding box to target CRS" ) );
  }
//.........这里部分代码省略.........

QWidget *QgsAttributeEditor::createAttributeEditor( QWidget *parent, QWidget *editor, QgsVectorLayer *vl, int idx, const QVariant &value )
{
  if ( !vl )
    return 0;

  QWidget *myWidget = 0;
  QgsVectorLayer::EditType editType = vl->editType( idx );
  const QgsField &field = vl->pendingFields()[idx];
  QVariant::Type myFieldType = field.type();

  switch ( editType )
  {
    case QgsVectorLayer::UniqueValues:
    {
      QList<QVariant> values;
      vl->dataProvider()->uniqueValues( idx, values );

      QComboBox *cb = comboBox( editor, parent );
      if ( cb )
      {
        cb->setEditable( false );

        for ( QList<QVariant>::iterator it = values.begin(); it != values.end(); it++ )
          cb->addItem( it->toString(), it->toString() );

        myWidget = cb;
      }

    }
    break;

    case QgsVectorLayer::Enumeration:
    {
      QStringList enumValues;
      vl->dataProvider()->enumValues( idx, enumValues );

      QComboBox *cb = comboBox( editor, parent );
      if ( cb )
      {
        QStringList::const_iterator s_it = enumValues.constBegin();
        for ( ; s_it != enumValues.constEnd(); ++s_it )
        {
          cb->addItem( *s_it, *s_it );
        }

        myWidget = cb;
      }
    }
    break;

    case QgsVectorLayer::ValueMap:
    {
      const QMap<QString, QVariant> &map = vl->valueMap( idx );

      QComboBox *cb = comboBox( editor, parent );
      if ( cb )
      {
        for ( QMap<QString, QVariant>::const_iterator it = map.begin(); it != map.end(); it++ )
        {
          cb->addItem( it.key(), it.value() );
        }

        myWidget = cb;
      }
    }
    break;

    case QgsVectorLayer::ValueRelation:
    {
      QSettings settings;
      QString nullValue = settings.value( "qgis/nullValue", "NULL" ).toString();

      const QgsVectorLayer::ValueRelationData &data = vl->valueRelation( idx );

      QgsVectorLayer *layer = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( data.mLayer ) );
      QMap< QString, QString > map;

      int fi = -1;
      if ( layer )
      {
        int ki = layer->fieldNameIndex( data.mOrderByValue ? data.mValue : data.mKey );
        int vi = layer->fieldNameIndex( data.mOrderByValue ? data.mKey : data.mValue );

        if ( !data.mFilterAttributeColumn.isNull() )
          fi = layer->fieldNameIndex( data.mFilterAttributeColumn );

        if ( data.mAllowNull )
          map.insert( nullValue, tr( "(no selection)" ) );

        if ( ki >= 0 && vi >= 0 )
        {
          QgsAttributeList attributes;
          attributes << ki;
          attributes << vi;
          if ( fi >= 0 )
            attributes << fi;
          layer->select( attributes, QgsRectangle(), false );
          QgsFeature f;
          while ( layer->nextFeature( f ) )
          {
//.........这里部分代码省略.........

QgsRectangle QgsAlignRaster::clipExtent() const
{
  return QgsRectangle( mClipExtent[0], mClipExtent[1],
                       mClipExtent[2], mClipExtent[3] );
}

bool QgsAtlasComposition::prepareForFeature( const int featureI, const bool updateMaps )
{
  if ( !mCoverageLayer )
  {
    return false;
  }

  if ( mFeatureIds.isEmpty() )
  {
    emit statusMsgChanged( tr( "No matching atlas features" ) );
    return false;
  }

  if ( featureI >= mFeatureIds.size() )
  {
    return false;
  }

  mCurrentFeatureNo = featureI;

  // retrieve the next feature, based on its id
  mCoverageLayer->getFeatures( QgsFeatureRequest().setFilterFid( mFeatureIds[ featureI ].first ) ).nextFeature( mCurrentFeature );

  QgsExpressionContext expressionContext = createExpressionContext();

  // generate filename for current feature
  if ( !evalFeatureFilename( expressionContext ) )
  {
    //error evaluating filename
    return false;
  }

  mGeometryCache.clear();
  emit featureChanged( &mCurrentFeature );
  emit statusMsgChanged( QString( tr( "Atlas feature %1 of %2" ) ).arg( featureI + 1 ).arg( mFeatureIds.size() ) );

  if ( !mCurrentFeature.isValid() )
  {
    //bad feature
    return true;
  }

  if ( !updateMaps )
  {
    //nothing more to do
    return true;
  }

  //update composer maps

  //build a list of atlas-enabled composer maps
  QList<QgsComposerMap*> maps;
  QList<QgsComposerMap*> atlasMaps;
  mComposition->composerItems( maps );
  if ( maps.isEmpty() )
  {
    return true;
  }
  for ( QList<QgsComposerMap*>::iterator mit = maps.begin(); mit != maps.end(); ++mit )
  {
    QgsComposerMap* currentMap = ( *mit );
    if ( !currentMap->atlasDriven() )
    {
      continue;
    }
    atlasMaps << currentMap;
  }

  if ( !atlasMaps.isEmpty() )
  {
    //clear the transformed bounds of the previous feature
    mTransformedFeatureBounds = QgsRectangle();

    // compute extent of current feature in the map CRS. This should be set on a per-atlas map basis,
    // but given that it's not currently possible to have maps with different CRSes we can just
    // calculate it once based on the first atlas maps' CRS.
    computeExtent( atlasMaps[0] );
  }

  for ( QList<QgsComposerMap*>::iterator mit = maps.begin(); mit != maps.end(); ++mit )
  {
    if (( *mit )->atlasDriven() )
    {
      // map is atlas driven, so update it's bounds (causes a redraw)
      prepareMap( *mit );
    }
    else
    {
      // map is not atlas driven, so manually force a redraw (to reflect possibly atlas
      // dependent symbology)
      ( *mit )->cache();
    }
  }

  return true;
}

void QgsAtlasComposition::prepareMap( QgsComposerMap* map )
{
  if ( !map->atlasDriven() || mCoverageLayer->wkbType() == QGis::WKBNoGeometry )
  {
    return;
  }

  if ( mTransformedFeatureBounds.isEmpty() )
  {
    //transformed extent of current feature hasn't been calculated yet. This can happen if
    //a map has been set to be atlas controlled after prepare feature was called
    computeExtent( map );
  }

  double xa1 = mTransformedFeatureBounds.xMinimum();
  double xa2 = mTransformedFeatureBounds.xMaximum();
  double ya1 = mTransformedFeatureBounds.yMinimum();
  double ya2 = mTransformedFeatureBounds.yMaximum();
  QgsRectangle newExtent = mTransformedFeatureBounds;
  QgsRectangle mOrigExtent( map->extent() );

  //sanity check - only allow fixed scale mode for point layers
  bool isPointLayer = false;
  switch ( mCoverageLayer->wkbType() )
  {
    case QGis::WKBPoint:
    case QGis::WKBPoint25D:
    case QGis::WKBMultiPoint:
    case QGis::WKBMultiPoint25D:
      isPointLayer = true;
      break;
    default:
      isPointLayer = false;
      break;
  }

  if ( map->atlasScalingMode() == QgsComposerMap::Fixed || map->atlasScalingMode() == QgsComposerMap::Predefined || isPointLayer )
  {
    QgsScaleCalculator calc;
    calc.setMapUnits( composition()->mapSettings().mapUnits() );
    calc.setDpi( 25.4 );
    double originalScale = calc.calculate( mOrigExtent, map->rect().width() );
    double geomCenterX = ( xa1 + xa2 ) / 2.0;
    double geomCenterY = ( ya1 + ya2 ) / 2.0;

    if ( map->atlasScalingMode() == QgsComposerMap::Fixed || isPointLayer )
    {
      // only translate, keep the original scale (i.e. width x height)
      double xMin = geomCenterX - mOrigExtent.width() / 2.0;
      double yMin = geomCenterY - mOrigExtent.height() / 2.0;
      newExtent = QgsRectangle( xMin,
                                yMin,
                                xMin + mOrigExtent.width(),
                                yMin + mOrigExtent.height() );

      //scale newExtent to match original scale of map
      //this is required for geographic coordinate systems, where the scale varies by extent
      double newScale = calc.calculate( newExtent, map->rect().width() );
      newExtent.scale( originalScale / newScale );
    }
    else if ( map->atlasScalingMode() == QgsComposerMap::Predefined )
    {
      // choose one of the predefined scales
      double newWidth = mOrigExtent.width();
      double newHeight = mOrigExtent.height();
      const QVector<qreal>& scales = mPredefinedScales;
      for ( int i = 0; i < scales.size(); i++ )
      {
        double ratio = scales[i] / originalScale;
        newWidth = mOrigExtent.width() * ratio;
        newHeight = mOrigExtent.height() * ratio;

        // compute new extent, centered on feature
        double xMin = geomCenterX - newWidth / 2.0;
        double yMin = geomCenterY - newHeight / 2.0;
        newExtent = QgsRectangle( xMin,
                                  yMin,
                                  xMin + newWidth,
                                  yMin + newHeight );

        //scale newExtent to match desired map scale
        //this is required for geographic coordinate systems, where the scale varies by extent
        double newScale = calc.calculate( newExtent, map->rect().width() );
        newExtent.scale( scales[i] / newScale );

        if (( newExtent.width() >= mTransformedFeatureBounds.width() ) && ( newExtent.height() >= mTransformedFeatureBounds.height() ) )
        {
          // this is the smallest extent that embeds the feature, stop here
          break;
        }
      }
    }
  }
  else if ( map->atlasScalingMode() == QgsComposerMap::Auto )
  {
    // auto scale

    double geomRatio = mTransformedFeatureBounds.width() / mTransformedFeatureBounds.height();
    double mapRatio = mOrigExtent.width() / mOrigExtent.height();

//.........这里部分代码省略.........

QgsGraduatedSymbolRendererV2* QgsGraduatedSymbolRendererV2::createRenderer(
  QgsVectorLayer* vlayer,
  QString attrName,
  int classes,
  Mode mode,
  QgsSymbolV2* symbol,
  QgsVectorColorRampV2* ramp )
{
  if ( classes < 1 )
    return NULL;

  int attrNum = vlayer->fieldNameIndex( attrName );

  double minimum = vlayer->minimumValue( attrNum ).toDouble();
  double maximum = vlayer->maximumValue( attrNum ).toDouble();
  QgsDebugMsg( QString( "min %1 // max %2" ).arg( minimum ).arg( maximum ) );

  QList<double> breaks;
  QList<int> labels;
  if ( mode == EqualInterval )
  {
    breaks = _calcEqualIntervalBreaks( minimum, maximum, classes );
  }
  else if ( mode == Pretty )
  {
    breaks = _calcPrettyBreaks( minimum, maximum, classes );
  }
  else if ( mode == Quantile || mode == Jenks || mode == StdDev )
  {
    // get values from layer
    QList<double> values;
    QgsFeature f;
    QgsAttributeList lst;
    lst.append( attrNum );
    vlayer->select( lst, QgsRectangle(), false );
    while ( vlayer->nextFeature( f ) )
      values.append( f.attributeMap()[attrNum].toDouble() );
    // calculate the breaks
    if ( mode == Quantile )
    {
      breaks = _calcQuantileBreaks( values, classes );
    }
    else if ( mode == Jenks )
    {
      breaks = _calcJenksBreaks( values, classes, minimum, maximum );
    }
    else if ( mode == StdDev )
    {
      breaks = _calcStdDevBreaks( values, classes, labels );
    }
  }
  else
  {
    Q_ASSERT( false );
  }

  QgsRangeList ranges;
  double lower, upper = minimum;
  QString label;

  // "breaks" list contains all values at class breaks plus maximum as last break
  int i = 0;
  for ( QList<double>::iterator it = breaks.begin(); it != breaks.end(); ++it, ++i )
  {
    lower = upper; // upper border from last interval
    upper = *it;
    if ( mode == StdDev )
    {
      if ( i == 0 )
      {
        label = "< " + QString::number( labels[i], 'i', 0 ) + " Std Dev";
      }
      else if ( i == labels.count() - 1 )
      {
        label = ">= " + QString::number( labels[i-1], 'i', 0 ) + " Std Dev";
      }
      else
      {
        label = QString::number( labels[i-1], 'i', 0 ) + " Std Dev" + " - " + QString::number( labels[i], 'i', 0 ) + " Std Dev";
      }
    }
    else
    {
      label = QString::number( lower, 'f', 4 ) + " - " + QString::number( upper, 'f', 4 );
    }

    QgsSymbolV2* newSymbol = symbol->clone();
    double colorValue = ( breaks.count() > 1 ? ( double ) i / ( breaks.count() - 1 ) : 0 );
    newSymbol->setColor( ramp->color( colorValue ) ); // color from (0 / cl-1) to (cl-1 / cl-1)

    ranges.append( QgsRendererRangeV2( lower, upper, newSymbol, label ) );
  }

  QgsGraduatedSymbolRendererV2* r = new QgsGraduatedSymbolRendererV2( attrName, ranges );
  r->setSourceSymbol( symbol->clone() );
  r->setSourceColorRamp( ramp->clone() );
  r->setMode( mode );
  return r;
}

//.........这里部分代码省略.........
    {
      QString srsname( defaultCRSList.at( 0 ).toElement().text() );
      // Some servers like Geomedia advertize EPSG:XXXX even in WFS 1.1 or 2.0
      if ( srsname.startsWith( QLatin1String( "EPSG:" ) ) )
        mCaps.useEPSGColumnFormat = true;
      featureType.crslist.append( NormalizeSRSName( srsname ) );
    }

    //OtherSRS
    QDomNodeList otherCRSList = featureTypeElem.elementsByTagName( QStringLiteral( "OtherSRS" ) );
    if ( otherCRSList.length() == 0 )
      // In WFS 2.0, this is spelled OtherCRS...
      otherCRSList = featureTypeElem.elementsByTagName( QStringLiteral( "OtherCRS" ) );
    for ( int i = 0; i < otherCRSList.size(); ++i )
    {
      featureType.crslist.append( NormalizeSRSName( otherCRSList.at( i ).toElement().text() ) );
    }

    //Support <SRS> for compatibility with older versions
    QDomNodeList srsList = featureTypeElem.elementsByTagName( QStringLiteral( "SRS" ) );
    for ( int i = 0; i < srsList.size(); ++i )
    {
      featureType.crslist.append( NormalizeSRSName( srsList.at( i ).toElement().text() ) );
    }

    // Get BBox WFS 1.0 way
    QDomElement latLongBB = featureTypeElem.firstChildElement( QStringLiteral( "LatLongBoundingBox" ) );
    if ( latLongBB.hasAttributes() )
    {
      // Despite the name LatLongBoundingBox, the coordinates are supposed to
      // be expressed in <SRS>. From the WFS schema;
      // <!-- The LatLongBoundingBox element is used to indicate the edges of
      // an enclosing rectangle in the SRS of the associated feature type.
      featureType.bbox = QgsRectangle(
                           latLongBB.attribute( QStringLiteral( "minx" ) ).toDouble(),
                           latLongBB.attribute( QStringLiteral( "miny" ) ).toDouble(),
                           latLongBB.attribute( QStringLiteral( "maxx" ) ).toDouble(),
                           latLongBB.attribute( QStringLiteral( "maxy" ) ).toDouble() );
      featureType.bboxSRSIsWGS84 = false;

      // But some servers do not honour this and systematically reproject to WGS84
      // such as GeoServer. See http://osgeo-org.1560.x6.nabble.com/WFS-LatLongBoundingBox-td3813810.html
      // This is also true of TinyOWS
      if ( !featureType.crslist.isEmpty() &&
           featureType.bbox.xMinimum() >= -180 && featureType.bbox.yMinimum() >= -90 &&
           featureType.bbox.xMaximum() <= 180 && featureType.bbox.yMaximum() < 90 )
      {
        QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem::fromOgcWmsCrs( featureType.crslist[0] );
        if ( !crs.isGeographic() )
        {
          // If the CRS is projected then check that projecting the corner of the bbox, assumed to be in WGS84,
          // into the CRS, and then back to WGS84, works (check that we are in the validity area)
          QgsCoordinateReferenceSystem crsWGS84 = QgsCoordinateReferenceSystem::fromOgcWmsCrs( QStringLiteral( "CRS:84" ) );
          QgsCoordinateTransform ct( crsWGS84, crs );

          QgsPointXY ptMin( featureType.bbox.xMinimum(), featureType.bbox.yMinimum() );
          QgsPointXY ptMinBack( ct.transform( ct.transform( ptMin, QgsCoordinateTransform::ForwardTransform ), QgsCoordinateTransform::ReverseTransform ) );
          QgsPointXY ptMax( featureType.bbox.xMaximum(), featureType.bbox.yMaximum() );
          QgsPointXY ptMaxBack( ct.transform( ct.transform( ptMax, QgsCoordinateTransform::ForwardTransform ), QgsCoordinateTransform::ReverseTransform ) );

          QgsDebugMsg( featureType.bbox.toString() );
          QgsDebugMsg( ptMinBack.toString() );
          QgsDebugMsg( ptMaxBack.toString() );

          if ( fabs( featureType.bbox.xMinimum() - ptMinBack.x() ) < 1e-5 &&
               fabs( featureType.bbox.yMinimum() - ptMinBack.y() ) < 1e-5 &&

void QgsRasterProjector::calcSrcExtent()
{
  /* Run around the mCPMatrix and find source extent */
  // Attention, source limits are not necessarily on destination edges, e.g.
  // for destination EPSG:32661 Polar Stereographic and source EPSG:4326,
  // the maximum y may be in the middle of destination extent
  // TODO: How to find extent exactly and quickly?
  // For now, we runt through all matrix
  QgsPoint myPoint = mCPMatrix[0][0];
  mSrcExtent = QgsRectangle( myPoint.x(), myPoint.y(), myPoint.x(), myPoint.y() );
  for ( int i = 0; i < mCPRows; i++ )
  {
    for ( int j = 0; j < mCPCols ; j++ )
    {
      myPoint = mCPMatrix[i][j];
      if ( mCPLegalMatrix[i][j] )
      {
        mSrcExtent.combineExtentWith( myPoint.x(), myPoint.y() );
      }
    }
  }
  // Expand a bit to avoid possible approx coords falling out because of representation error?

  // Combine with maximum source  extent
  mSrcExtent = mSrcExtent.intersect( &mExtent );

  // If mMaxSrcXRes, mMaxSrcYRes are defined (fixed src resolution)
  // align extent to src resolution to avoid jumping of reprojected pixels
  // when shifting resampled grid.
  // Important especially if we are over mMaxSrcXRes, mMaxSrcYRes limits
  // Note however, that preceding filters (like resampler) may read data
  // on different resolution.

  QgsDebugMsg( "mSrcExtent = " + mSrcExtent.toString() );
  QgsDebugMsg( "mExtent = " + mExtent.toString() );
  if ( !mExtent.isEmpty() )
  {
    if ( mMaxSrcXRes > 0 )
    {
      // with floor/ceil it should work correctly also for mSrcExtent.xMinimum() < mExtent.xMinimum()
      double col = floor(( mSrcExtent.xMinimum() - mExtent.xMinimum() ) / mMaxSrcXRes );
      double x = mExtent.xMinimum() + col * mMaxSrcXRes;
      mSrcExtent.setXMinimum( x );

      col = ceil(( mSrcExtent.xMaximum() - mExtent.xMinimum() ) / mMaxSrcXRes );
      x = mExtent.xMinimum() + col * mMaxSrcXRes;
      mSrcExtent.setXMaximum( x );
    }
    if ( mMaxSrcYRes > 0 )
    {
      double row = floor(( mExtent.yMaximum() - mSrcExtent.yMaximum() ) / mMaxSrcYRes );
      double y = mExtent.yMaximum() - row * mMaxSrcYRes;
      mSrcExtent.setYMaximum( y );

      row = ceil(( mExtent.yMaximum() - mSrcExtent.yMinimum() ) / mMaxSrcYRes );
      y = mExtent.yMaximum() - row * mMaxSrcYRes;
      mSrcExtent.setYMinimum( y );
    }
  }
  QgsDebugMsg( "mSrcExtent = " + mSrcExtent.toString() );
}

void QgsAtlasComposition::prepareForFeature( size_t featureI )
{
  if ( !mComposerMap || !mCoverageLayer )
  {
    return;
  }

  // retrieve the next feature, based on its id
  mCoverageLayer->getFeatures( QgsFeatureRequest().setFilterFid( mFeatureIds[ featureI ] ) ).nextFeature( mCurrentFeature );

  if ( !mSingleFile && mFilenamePattern.size() > 0 )
  {
    QgsExpression::setSpecialColumn( "$feature", QVariant(( int )featureI + 1 ) );
    QVariant filenameRes = mFilenameExpr->evaluate( &mCurrentFeature, mCoverageLayer->pendingFields() );
    if ( mFilenameExpr->hasEvalError() )
    {
      throw std::runtime_error( tr( "Filename eval error: %1" ).arg( mFilenameExpr->evalErrorString() ).toLocal8Bit().data() );
    }

    mCurrentFilename = filenameRes.toString();
  }

  //
  // compute the new extent
  // keep the original aspect ratio
  // and apply a margin

  // QgsGeometry::boundingBox is expressed in the geometry"s native CRS
  // We have to transform the grometry to the destination CRS and ask for the bounding box
  // Note: we cannot directly take the transformation of the bounding box, since transformations are not linear

  QgsGeometry tgeom( *mCurrentFeature.geometry() );
  tgeom.transform( mTransform );
  QgsRectangle geom_rect = tgeom.boundingBox();

  double xa1 = geom_rect.xMinimum();
  double xa2 = geom_rect.xMaximum();
  double ya1 = geom_rect.yMinimum();
  double ya2 = geom_rect.yMaximum();
  QgsRectangle new_extent = geom_rect;

  // restore the original extent
  // (successive calls to setNewExtent tend to deform the original rectangle)
  mComposerMap->setNewExtent( mOrigExtent );

  if ( mFixedScale )
  {
    // only translate, keep the original scale (i.e. width x height)

    double geom_center_x = ( xa1 + xa2 ) / 2.0;
    double geom_center_y = ( ya1 + ya2 ) / 2.0;
    double xx = geom_center_x - mOrigExtent.width() / 2.0;
    double yy = geom_center_y - mOrigExtent.height() / 2.0;
    new_extent = QgsRectangle( xx,
                               yy,
                               xx + mOrigExtent.width(),
                               yy + mOrigExtent.height() );
  }
  else
  {
    // auto scale

    double geom_ratio = geom_rect.width() / geom_rect.height();
    double map_ratio = mOrigExtent.width() / mOrigExtent.height();

    // geometry height is too big
    if ( geom_ratio < map_ratio )
    {
      // extent the bbox's width
      double adj_width = ( map_ratio * geom_rect.height() - geom_rect.width() ) / 2.0;
      xa1 -= adj_width;
      xa2 += adj_width;
    }
    // geometry width is too big
    else if ( geom_ratio > map_ratio )
    {
      // extent the bbox's height
      double adj_height = ( geom_rect.width() / map_ratio - geom_rect.height() ) / 2.0;
      ya1 -= adj_height;
      ya2 += adj_height;
    }
    new_extent = QgsRectangle( xa1, ya1, xa2, ya2 );

    if ( mMargin > 0.0 )
    {
      new_extent.scale( 1 + mMargin );
    }
  }

  // evaluate label expressions
  QList<QgsComposerLabel*> labels;
  mComposition->composerItems( labels );
  QgsExpression::setSpecialColumn( "$feature", QVariant(( int )featureI + 1 ) );

  for ( QList<QgsComposerLabel*>::iterator lit = labels.begin(); lit != labels.end(); ++lit )
  {
    ( *lit )->setExpressionContext( &mCurrentFeature, mCoverageLayer );
  }

  // set the new extent (and render)
//.........这里部分代码省略.........

//.........这里部分代码省略.........
      {
        //SHIFT-clicking a selected item deselects it
        selectedItem->setSelected( false );

        //Check if we have any remaining selected items, and if so, update the item panel
        QList<QgsComposerItem*> selectedItems = composition()->selectedComposerItems();
        if ( selectedItems.size() > 0 )
        {
          emit selectedItemChanged( selectedItems.at( 0 ) );
        }
      }
      else
      {
        selectedItem->setSelected( true );
        QGraphicsView::mousePressEvent( e );
        emit selectedItemChanged( selectedItem );
      }
      break;
    }

    case Zoom:
    {
      if ( !( e->modifiers() & Qt::ShiftModifier ) )
      {
        //zoom in action
        startMarqueeZoom( scenePoint );
      }
      else
      {
        //zoom out action, so zoom out and recenter on clicked point
        double scaleFactor = 2;
        //get current visible part of scene
        QRect viewportRect( 0, 0, viewport()->width(), viewport()->height() );
        QgsRectangle visibleRect = QgsRectangle( mapToScene( viewportRect ).boundingRect() );

        //transform the mouse pos to scene coordinates
        QPointF scenePoint = mapToScene( e->pos() );

        visibleRect.scale( scaleFactor, scenePoint.x(), scenePoint.y() );
        QRectF boundsRect = visibleRect.toRectF();

        //zoom view to fit desired bounds
        fitInView( boundsRect, Qt::KeepAspectRatio );
      }
      break;
    }

    case Pan:
    {
      //pan action
      mPanning = true;
      mMouseLastXY = e->pos();
      viewport()->setCursor( Qt::ClosedHandCursor );
      break;
    }

    case MoveItemContent:
    {
      //get a list of items at clicked position
      QList<QGraphicsItem *> itemsAtCursorPos = items( e->pos() );
      if ( itemsAtCursorPos.size() == 0 )
      {
        //no items at clicked position
        return;
      }

//.........这里部分代码省略.........
          if ( !log.value( "identifier" ).isEmpty() && log.value( "error" ).isEmpty() ) continue;
        }

        QStringList myLog;
        myLog << "identifier:" + myCoverage.identifier;
        myCapabilities.describeCoverage( myCoverage.identifier );
        myCoverage = myCapabilities.coverage( myCoverage.identifier ); // get described
        QgsDataSourceURI myUri = myServerUri;
        myUri.setParam( "identifier", myCoverage.identifier );
        if ( myCoverage.times.size() > 0 )
        {
          myUri.setParam( "time", myCoverage.times.value( 0 ) );
        }
        myLog << "version:" + version;
        myLog << "uri:" + myUri.encodedUri();

        int myWidth = 100;
        int myHeight = 100;
        if ( myCoverage.hasSize )
        {
          myHeight = static_cast<int>( qRound( 1.0 * myWidth * myCoverage.height / myCoverage.width ) );
        }
        myLog << QString( "hasSize:%1" ).arg( myCoverage.hasSize );

        QgsRasterLayer * myLayer = new QgsRasterLayer( myUri.encodedUri(), myCoverage.identifier, "wcs", true );
        if ( myLayer->isValid() )
        {
          int myBandCount = myLayer->dataProvider()->bandCount();
          myLog << "bandCount:" + QString::number( myBandCount );
          if ( myBandCount > 0 )
          {
            myLog << "srcType:" + QString::number( myLayer->dataProvider()->srcDataType( 1 ) );

            QgsRasterBandStats myStats = myLayer->dataProvider()->bandStatistics( 1, QgsRasterBandStats::All, QgsRectangle(), myWidth * myHeight );
            myLog << "min:" + QString::number( myStats.minimumValue );
            myLog << "max:" + QString::number( myStats.maximumValue );
          }

          QgsMapRenderer myMapRenderer;
          QList<QgsMapLayer *> myLayersList;

          myLayersList.append( myLayer );
          QgsMapLayerRegistry::instance()->addMapLayers( myLayersList, false );

          QMap<QString, QgsMapLayer*> myLayersMap = QgsMapLayerRegistry::instance()->mapLayers();

          myMapRenderer.setLayerSet( myLayersMap.keys() );

          myMapRenderer.setExtent( myLayer->extent() );

          QImage myImage( myWidth, myHeight, QImage::Format_ARGB32_Premultiplied );
          myImage.fill( 0 );

          myMapRenderer.setOutputSize( QSize( myWidth, myHeight ), myImage.logicalDpiX() );

          QPainter myPainter( &myImage );
          myMapRenderer.render( &myPainter );

          // Save rendered image
          QString myPngPath = myPath + ".png";
          QgsDebugMsg( "myPngPath = " + myPngPath );
          myImage.save( myPngPath );

          // Verify data
          QSet<QString> myValues; // cannot be QSet<double>
          void *myData = myLayer->dataProvider()->readBlock( 1, myLayer->extent(), myWidth, myHeight );

void QgsComposerView::wheelZoom( QWheelEvent * event )
{
  //get mouse wheel zoom behaviour settings
  QSettings mySettings;
  int wheelAction = mySettings.value( "/qgis/wheel_action", 2 ).toInt();
  double zoomFactor = mySettings.value( "/qgis/zoom_factor", 2 ).toDouble();

  if (( QgsMapCanvas::WheelAction )wheelAction == QgsMapCanvas::WheelNothing )
  {
    return;
  }

  if ( event->modifiers() & Qt::ControlModifier )
  {
    //holding ctrl while wheel zooming results in a finer zoom
    zoomFactor = 1.0 + ( zoomFactor - 1.0 ) / 10.0;
  }

  //caculate zoom scale factor
  bool zoomIn = event->delta() > 0;
  double scaleFactor = ( zoomIn ? 1 / zoomFactor : zoomFactor );

  //get current visible part of scene
  QRect viewportRect( 0, 0, viewport()->width(), viewport()->height() );
  QgsRectangle visibleRect = QgsRectangle( mapToScene( viewportRect ).boundingRect() );

  //transform the mouse pos to scene coordinates
  QPointF scenePoint = mapToScene( event->pos() );

  //adjust view center according to wheel action setting
  switch (( QgsMapCanvas::WheelAction )wheelAction )
  {
    case QgsMapCanvas::WheelZoomAndRecenter:
    {
      centerOn( scenePoint.x(), scenePoint.y() );
      break;
    }

    case QgsMapCanvas::WheelZoomToMouseCursor:
    {
      QgsPoint oldCenter( visibleRect.center() );
      QgsPoint newCenter( scenePoint.x() + (( oldCenter.x() - scenePoint.x() ) * scaleFactor ),
                          scenePoint.y() + (( oldCenter.y() - scenePoint.y() ) * scaleFactor ) );
      centerOn( newCenter.x(), newCenter.y() );
      break;
    }

    default:
      break;
  }

  //zoom composition
  if ( zoomIn )
  {
    scale( zoomFactor, zoomFactor );
  }
  else
  {
    scale( 1 / zoomFactor, 1 / zoomFactor );
  }

  //update composition for new zoom
  emit zoomLevelChanged();
  updateRulers();
  update();
  //redraw cached map items
  QList<QGraphicsItem *> itemList = composition()->items();
  QList<QGraphicsItem *>::iterator itemIt = itemList.begin();
  for ( ; itemIt != itemList.end(); ++itemIt )
  {
    QgsComposerMap* mypItem = dynamic_cast<QgsComposerMap *>( *itemIt );
    if (( mypItem ) && ( mypItem->previewMode() == QgsComposerMap::Render ) )
    {
      mypItem->updateCachedImage();
    }
  }
}