Esempi in C++ (Cpp) per QgsLineSymbolV2::setDataDefinedWidth

Esempio n. 1

File: qgsrendererv2.cpp Progetto: Zakui/QGIS

void QgsFeatureRendererV2::convertSymbolSizeScale( QgsSymbolV2 * symbol, QgsSymbolV2::ScaleMethod method, const QString & field )
{
  if ( symbol->type() == QgsSymbolV2::Marker )
  {
    QgsMarkerSymbolV2 * s = static_cast<QgsMarkerSymbolV2 *>( symbol );
    if ( QgsSymbolV2::ScaleArea == QgsSymbolV2::ScaleMethod( method ) )
    {
      const QgsDataDefined dd( "coalesce(sqrt(" + QString::number( s->size() ) + " * (" + field + ")),0)" );
      s->setDataDefinedSize( dd );
    }
    else
    {
      const QgsDataDefined dd( "coalesce(" + QString::number( s->size() ) + " * (" + field + "),0)" );
      s->setDataDefinedSize( dd );
    }
    s->setScaleMethod( QgsSymbolV2::ScaleDiameter );
  }
  else if ( symbol->type() == QgsSymbolV2::Line )
  {
    QgsLineSymbolV2 * s = static_cast<QgsLineSymbolV2 *>( symbol );
    const QgsDataDefined dd( "coalesce(" + QString::number( s->width() ) + " * (" + field + "),0)" );
    s->setDataDefinedWidth( dd );
  }
}