Exemplos de QgsMapLayer::getTransparency em C++ (Cpp)

Exemplo n.º 1

Arquivo: qgscomposerlegend.cpp Projeto: cugxiangzhenwei/QGIS_174_VS2008

void QgsComposerLegend::drawLayerItem( QPainter* p, QgsComposerLayerItem* layerItem, double& currentYCoord, double& maxXCoord )
{
  if ( !layerItem )
  {
    return;
  }

  int opacity = 255;
  QgsMapLayer* currentLayer = QgsMapLayerRegistry::instance()->mapLayer( layerItem->layerID() );
  if ( currentLayer )
  {
    opacity = currentLayer->getTransparency();
  }

  //Let the user omit the layer title item by having an empty layer title string
  if ( !layerItem->text().isEmpty() )
  {
    currentYCoord += mLayerSpace;
    currentYCoord += fontAscentMillimeters( mLayerFont );

    //draw layer Item
    if ( p )
    {
      p->setPen( QColor( 0, 0, 0 ) );
      drawText( p, mBoxSpace, currentYCoord, layerItem->text(), mLayerFont );
    }

    maxXCoord = qMax( maxXCoord, 2 * mBoxSpace + textWidthMillimeters( mLayerFont, layerItem->text() ) );
  }
  else //layer title omited
  {
    //symbol space will be added before the item later
    currentYCoord += ( mLayerSpace - mSymbolSpace );
  }

  //and child items
  drawLayerChildItems( p, layerItem, currentYCoord, maxXCoord, opacity );
}