Ejemplos de bandCount en C++ (Cpp)

Ejemplo n.º 1

Archivo: qgsrasterdataprovider.cpp Proyecto: Nald/Quantum-GIS

// Default implementation for values
QMap<int, QVariant> QgsRasterDataProvider::identify( const QgsPoint & thePoint, IdentifyFormat theFormat, const QgsRectangle &theExtent, int theWidth, int theHeight )
{
  QgsDebugMsg( "Entered" );
  QMap<int, QVariant> results;

  if ( theFormat != IdentifyFormatValue || !( capabilities() & IdentifyValue ) )
  {
    QgsDebugMsg( "Format not supported" );
    return results;
  }

  if ( !extent().contains( thePoint ) )
  {
    // Outside the raster
    for ( int bandNo = 1; bandNo <= bandCount(); bandNo++ )
    {
      results.insert( bandNo, noDataValue( bandNo ) );
    }
    return results;
  }

  QgsRectangle myExtent = theExtent;
  if ( myExtent.isEmpty() )  myExtent = extent();

  if ( theWidth == 0 )
  {
    theWidth = capabilities() & Size ? xSize() : 1000;
  }
  if ( theHeight == 0 )
  {
    theHeight = capabilities() & Size ? ySize() : 1000;
  }

  // Calculate the row / column where the point falls
  double xres = ( myExtent.width() ) / theWidth;
  double yres = ( myExtent.height() ) / theHeight;

  int col = ( int ) floor(( thePoint.x() - myExtent.xMinimum() ) / xres );
  int row = ( int ) floor(( myExtent.yMaximum() - thePoint.y() ) / yres );

  double xMin = myExtent.xMinimum() + col * xres;
  double xMax = xMin + xres;
  double yMax = myExtent.yMaximum() - row * yres;
  double yMin = yMax - yres;
  QgsRectangle pixelExtent( xMin, yMin, xMax, yMax );

  for ( int i = 1; i <= bandCount(); i++ )
  {
    QgsRasterBlock * myBlock = block( i, pixelExtent, 1, 1 );

    double value = noDataValue( i );
    if ( myBlock ) value = myBlock->value( 0 );

    results.insert( i, value );
  }
  return results;
}

Ejemplo n.º 2

Archivo: qgsrasterdataprovider.cpp Proyecto: lyhkop/QGIS

// Default implementation for values
QgsRasterIdentifyResult QgsRasterDataProvider::identify( const QgsPointXY &point, QgsRaster::IdentifyFormat format, const QgsRectangle &boundingBox, int width, int height, int /*dpi*/ )
{
  QgsDebugMsgLevel( "Entered", 4 );
  QMap<int, QVariant> results;

  if ( format != QgsRaster::IdentifyFormatValue || !( capabilities() & IdentifyValue ) )
  {
    QgsDebugMsg( "Format not supported" );
    return QgsRasterIdentifyResult( ERR( tr( "Format not supported" ) ) );
  }

  if ( !extent().contains( point ) )
  {
    // Outside the raster
    for ( int bandNo = 1; bandNo <= bandCount(); bandNo++ )
    {
      results.insert( bandNo, QVariant() );
    }
    return QgsRasterIdentifyResult( QgsRaster::IdentifyFormatValue, results );
  }

  QgsRectangle finalExtent = boundingBox;
  if ( finalExtent.isEmpty() )
    finalExtent = extent();

  if ( width == 0 )
  {
    width = capabilities() & Size ? xSize() : 1000;
  }
  if ( height == 0 )
  {
    height = capabilities() & Size ? ySize() : 1000;
  }

  // Calculate the row / column where the point falls
  double xres = ( finalExtent.width() ) / width;
  double yres = ( finalExtent.height() ) / height;

  int col = static_cast< int >( std::floor( ( point.x() - finalExtent.xMinimum() ) / xres ) );
  int row = static_cast< int >( std::floor( ( finalExtent.yMaximum() - point.y() ) / yres ) );

  double xMin = finalExtent.xMinimum() + col * xres;
  double xMax = xMin + xres;
  double yMax = finalExtent.yMaximum() - row * yres;
  double yMin = yMax - yres;
  QgsRectangle pixelExtent( xMin, yMin, xMax, yMax );

  for ( int i = 1; i <= bandCount(); i++ )
  {
    QgsRasterBlock *myBlock = block( i, pixelExtent, 1, 1 );

    if ( myBlock )
    {
      double value = myBlock->value( 0 );

      results.insert( i, value );
      delete myBlock;
    }
    else
    {
      results.insert( i, QVariant() );
    }
  }
  return QgsRasterIdentifyResult( QgsRaster::IdentifyFormatValue, results );
}