qgselevationutils.cpp

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/***************************************************************************
  qgselevationutils.cpp
  ------------------
  Date                 : November 2020
  Copyright            : (C) 2020 by Nyall Dawson
  Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgselevationutils.h"
#include "qgsproject.h"
#include "qgsmaplayerelevationproperties.h"
 
 
QgsDoubleRange QgsElevationUtils::calculateZRangeForProject( QgsProject *project )
{
  const QMap<QString, QgsMapLayer *> &mapLayers = project->mapLayers();
  QgsMapLayer *currentLayer = nullptr;
 
  double min = std::numeric_limits<double>::quiet_NaN();
  double max = std::numeric_limits<double>::quiet_NaN();
 
  for ( QMap<QString, QgsMapLayer *>::const_iterator it = mapLayers.constBegin(); it != mapLayers.constEnd(); ++it )
  {
    currentLayer = it.value();
 
    if ( !currentLayer->elevationProperties() || !currentLayer->elevationProperties()->hasElevation() )
      continue;
 
    const QgsDoubleRange layerRange = currentLayer->elevationProperties()->calculateZRange( currentLayer );
    if ( layerRange.isInfinite() )
      continue;
 
    if ( layerRange.lower() > std::numeric_limits< double >::lowest() )
    {
      if ( std::isnan( min ) || layerRange.lower() < min )
        min = layerRange.lower();
    }
 
    if ( layerRange.upper() < std::numeric_limits< double >::max() )
    {
      if ( std::isnan( max ) || layerRange.upper() > max )
        max = layerRange.upper();
    }
  }
 
  return QgsDoubleRange( std::isnan( min ) ? std::numeric_limits< double >::lowest() : min,
                         std::isnan( max ) ? std::numeric_limits< double >::max() : max );
}