Exemple #1
0
double QgsComposerItem::horizontalViewScaleFactor() const
{
  double result = -1;
  if ( scene() )
  {
    QList<QGraphicsView *> viewList = scene()->views();
    if ( !viewList.isEmpty() ) //if not, probably this function was called from non-gui code
    {
      QGraphicsView *currentView = viewList.at( 0 );
      if ( currentView->isVisible() )
      {
        result = currentView->transform().m11();
        mLastValidViewScaleFactor = result;
      }
    }
  }
  return result;
}
Exemple #2
0
void QgsPaperGrid::paint( QPainter* painter, const QStyleOptionGraphicsItem* itemStyle, QWidget* pWidget )
{
  Q_UNUSED( itemStyle );
  Q_UNUSED( pWidget );

  //draw grid
  if ( mComposition )
  {
    if ( mComposition->gridVisible() && mComposition->plotStyle() ==  QgsComposition::Preview
         && mComposition->snapGridResolution() > 0 )
    {
      int gridMultiplyX = ( int )( mComposition->snapGridOffsetX() / mComposition->snapGridResolution() );
      int gridMultiplyY = ( int )( mComposition->snapGridOffsetY() / mComposition->snapGridResolution() );
      double currentXCoord = mComposition->snapGridOffsetX() - gridMultiplyX * mComposition->snapGridResolution();
      double currentYCoord;
      double minYCoord = mComposition->snapGridOffsetY() - gridMultiplyY * mComposition->snapGridResolution();

      painter->save();
      //turn of antialiasing so grid is nice and sharp
      painter->setRenderHint( QPainter::Antialiasing, false );

      if ( mComposition->gridStyle() == QgsComposition::Solid )
      {
        painter->setPen( mComposition->gridPen() );

        //draw vertical lines
        for ( ; currentXCoord <= rect().width(); currentXCoord += mComposition->snapGridResolution() )
        {
          painter->drawLine( QPointF( currentXCoord, 0 ), QPointF( currentXCoord, rect().height() ) );
        }

        //draw horizontal lines
        currentYCoord = minYCoord;
        for ( ; currentYCoord <= rect().height(); currentYCoord += mComposition->snapGridResolution() )
        {
          painter->drawLine( QPointF( 0, currentYCoord ), QPointF( rect().width(), currentYCoord ) );
        }
      }
      else //'Dots' or 'Crosses'
      {
        QPen gridPen = mComposition->gridPen();
        painter->setPen( gridPen );
        painter->setBrush( QBrush( gridPen.color() ) );
        double halfCrossLength = 1;
        if ( mComposition->gridStyle() == QgsComposition::Dots )
        {
          //dots are actually drawn as tiny crosses a few pixels across
          //check QGraphicsView to get current transform
          if ( scene() )
          {
            QList<QGraphicsView*> viewList = scene()->views();
            if ( viewList.size() > 0 )
            {
              QGraphicsView* currentView = viewList.at( 0 );
              if ( currentView->isVisible() )
              {
                //set halfCrossLength to equivalent of 1 pixel
                halfCrossLength = 1 / currentView->transform().m11();
              }
            }
          }
        }
        else if ( mComposition->gridStyle() == QgsComposition::Crosses )
        {
          halfCrossLength = mComposition->snapGridResolution() / 6;
        }

        for ( ; currentXCoord <= rect().width(); currentXCoord += mComposition->snapGridResolution() )
        {
          currentYCoord = minYCoord;
          for ( ; currentYCoord <= rect().height(); currentYCoord += mComposition->snapGridResolution() )
          {
            painter->drawLine( QPointF( currentXCoord - halfCrossLength, currentYCoord ), QPointF( currentXCoord + halfCrossLength, currentYCoord ) );
            painter->drawLine( QPointF( currentXCoord, currentYCoord - halfCrossLength ), QPointF( currentXCoord, currentYCoord + halfCrossLength ) );
          }
        }
      }
      painter->restore();
    }
  }
}