Exemplo n.º 1
0
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();

  //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() );

  //zoom composition, respecting wheel action setting
  switch (( QgsMapCanvas::WheelAction )wheelAction )
  {
    case QgsMapCanvas::WheelZoom:
      // zoom without changing extent
      if ( zoomIn )
      {
        scale( zoomFactor, zoomFactor );
      }
      else
      {
        scale( 1 / zoomFactor, 1 / zoomFactor );
      }
      break;

    case QgsMapCanvas::WheelZoomAndRecenter:
    {
      visibleRect.scale( scaleFactor, scenePoint.x(), scenePoint.y() );
      fitInView( visibleRect.toRectF(), Qt::KeepAspectRatio );
      break;
    }

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

      visibleRect.scale( scaleFactor, newCenter.x(), newCenter.y() );
      fitInView( visibleRect.toRectF(), Qt::KeepAspectRatio );
      break;
    }

    case QgsMapCanvas::WheelNothing:
      return;
  }

  //update composition for new zoom
  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();
    }
  }
}
Exemplo n.º 2
0
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();
    }
  }
}
Exemplo n.º 3
0
void QgsComposition::addItemsFromXML( const QDomElement& elem, const QDomDocument& doc, QMap< QgsComposerMap*, int >* mapsToRestore,
                                      bool addUndoCommands, QPointF* pos )
{
  QDomNodeList composerLabelList = elem.elementsByTagName( "ComposerLabel" );
  for ( int i = 0; i < composerLabelList.size(); ++i )
  {
    QDomElement currentComposerLabelElem = composerLabelList.at( i ).toElement();
    QgsComposerLabel* newLabel = new QgsComposerLabel( this );
    newLabel->readXML( currentComposerLabelElem, doc );
    if ( pos )
    {
      newLabel->setItemPosition( pos->x(), pos->y() );
    }
    addComposerLabel( newLabel );
    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newLabel, tr( "Label added" ) );
    }
  }
  // map
  QDomNodeList composerMapList = elem.elementsByTagName( "ComposerMap" );
  for ( int i = 0; i < composerMapList.size(); ++i )
  {
    QDomElement currentComposerMapElem = composerMapList.at( i ).toElement();
    QgsComposerMap* newMap = new QgsComposerMap( this );
    newMap->readXML( currentComposerMapElem, doc );
    newMap->assignFreeId();

    if ( mapsToRestore )
    {
      mapsToRestore->insert( newMap, ( int )( newMap->previewMode() ) );
      newMap->setPreviewMode( QgsComposerMap::Rectangle );
    }
    addComposerMap( newMap, false );

    if ( pos )
    {
      newMap->setItemPosition( pos->x(), pos->y() );
    }

    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newMap, tr( "Map added" ) );
    }
  }
  // arrow
  QDomNodeList composerArrowList = elem.elementsByTagName( "ComposerArrow" );
  for ( int i = 0; i < composerArrowList.size(); ++i )
  {
    QDomElement currentComposerArrowElem = composerArrowList.at( i ).toElement();
    QgsComposerArrow* newArrow = new QgsComposerArrow( this );
    newArrow->readXML( currentComposerArrowElem, doc );
    if ( pos )
    {
      newArrow->setItemPosition( pos->x(), pos->y() );
    }
    addComposerArrow( newArrow );
    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newArrow, tr( "Arrow added" ) );
    }
  }
  // scalebar
  QDomNodeList composerScaleBarList = elem.elementsByTagName( "ComposerScaleBar" );
  for ( int i = 0; i < composerScaleBarList.size(); ++i )
  {
    QDomElement currentComposerScaleBarElem = composerScaleBarList.at( i ).toElement();
    QgsComposerScaleBar* newScaleBar = new QgsComposerScaleBar( this );
    newScaleBar->readXML( currentComposerScaleBarElem, doc );
    if ( pos )
    {
      newScaleBar->setItemPosition( pos->x(), pos->y() );
    }
    addComposerScaleBar( newScaleBar );
    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newScaleBar, tr( "Scale bar added" ) );
    }
  }
  // shape
  QDomNodeList composerShapeList = elem.elementsByTagName( "ComposerShape" );
  for ( int i = 0; i < composerShapeList.size(); ++i )
  {
    QDomElement currentComposerShapeElem = composerShapeList.at( i ).toElement();
    QgsComposerShape* newShape = new QgsComposerShape( this );
    newShape->readXML( currentComposerShapeElem, doc );
    if ( pos )
    {
      newShape->setItemPosition( pos->x(), pos->y() );
    }
    addComposerShape( newShape );
    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newShape, tr( "Shape added" ) );
    }
  }
  // picture
  QDomNodeList composerPictureList = elem.elementsByTagName( "ComposerPicture" );
  for ( int i = 0; i < composerPictureList.size(); ++i )
  {
    QDomElement currentComposerPictureElem = composerPictureList.at( i ).toElement();
    QgsComposerPicture* newPicture = new QgsComposerPicture( this );
    newPicture->readXML( currentComposerPictureElem, doc );
    if ( pos )
    {
      newPicture->setItemPosition( pos->x(), pos->y() );
    }
    addComposerPicture( newPicture );
    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newPicture, tr( "Picture added" ) );
    }
  }
  // legend
  QDomNodeList composerLegendList = elem.elementsByTagName( "ComposerLegend" );
  for ( int i = 0; i < composerLegendList.size(); ++i )
  {
    QDomElement currentComposerLegendElem = composerLegendList.at( i ).toElement();
    QgsComposerLegend* newLegend = new QgsComposerLegend( this );
    newLegend->readXML( currentComposerLegendElem, doc );
    if ( pos )
    {
      newLegend->setItemPosition( pos->x(), pos->y() );
    }
    addComposerLegend( newLegend );
    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newLegend, tr( "Legend added" ) );
    }
  }
  // table
  QDomNodeList composerTableList = elem.elementsByTagName( "ComposerAttributeTable" );
  for ( int i = 0; i < composerTableList.size(); ++i )
  {
    QDomElement currentComposerTableElem = composerTableList.at( i ).toElement();
    QgsComposerAttributeTable* newTable = new QgsComposerAttributeTable( this );
    newTable->readXML( currentComposerTableElem, doc );
    if ( pos )
    {
      newTable->setItemPosition( pos->x(), pos->y() );
    }
    addComposerTable( newTable );
    if ( addUndoCommands )
    {
      pushAddRemoveCommand( newTable, tr( "Table added" ) );
    }
  }
  //html
  QDomNodeList composerHtmlList = elem.elementsByTagName( "ComposerHtml" );
  for ( int i = 0; i < composerHtmlList.size(); ++i )
  {
    QDomElement currentHtmlElem = composerHtmlList.at( i ).toElement();
    QgsComposerHtml* newHtml = new QgsComposerHtml( this, false );
    newHtml->readXML( currentHtmlElem, doc );
    newHtml->setCreateUndoCommands( true );
    this->addMultiFrame( newHtml );
  }
}