void ScrollZoomer::updateScrollBars()
{
if ( !canvas() )
return;
const int xAxis = QwtPlotZoomer::xAxis().pos;
const int yAxis = QwtPlotZoomer::yAxis().pos;
int xScrollBarAxis = xAxis;
if ( hScrollBarPosition() == OppositeToScale )
xScrollBarAxis = oppositeAxis( xScrollBarAxis );
int yScrollBarAxis = yAxis;
if ( vScrollBarPosition() == OppositeToScale )
yScrollBarAxis = oppositeAxis( yScrollBarAxis );
QwtPlotLayout *layout = plot()->plotLayout();
bool showHScrollBar = needScrollBar( Qt::Horizontal );
if ( showHScrollBar )
{
ScrollBar *sb = scrollBar( Qt::Horizontal );
sb->setPalette( plot()->palette() );
sb->setInverted( !plot()->axisScaleDiv( xAxis ).isIncreasing() );
sb->setBase( zoomBase().left(), zoomBase().right() );
sb->moveSlider( zoomRect().left(), zoomRect().right() );
if ( !sb->isVisibleTo( canvas() ) )
{
sb->show();
layout->setCanvasMargin( layout->canvasMargin( xScrollBarAxis )
+ sb->extent(), xScrollBarAxis );
}
}
else
{
if ( horizontalScrollBar() )
{
horizontalScrollBar()->hide();
layout->setCanvasMargin( layout->canvasMargin( xScrollBarAxis )
- horizontalScrollBar()->extent(), xScrollBarAxis );
}
}
bool showVScrollBar = needScrollBar( Qt::Vertical );
if ( showVScrollBar )
{
ScrollBar *sb = scrollBar( Qt::Vertical );
sb->setPalette( plot()->palette() );
sb->setInverted( !plot()->axisScaleDiv( yAxis ).isIncreasing() );
sb->setBase( zoomBase().top(), zoomBase().bottom() );
sb->moveSlider( zoomRect().top(), zoomRect().bottom() );
if ( !sb->isVisibleTo( canvas() ) )
{
sb->show();
layout->setCanvasMargin( layout->canvasMargin( yScrollBarAxis )
+ sb->extent(), yScrollBarAxis );
}
}
else
{
if ( verticalScrollBar() )
{
verticalScrollBar()->hide();
layout->setCanvasMargin( layout->canvasMargin( yScrollBarAxis )
- verticalScrollBar()->extent(), yScrollBarAxis );
}
}
if ( showHScrollBar && showVScrollBar )
{
if ( d_cornerWidget == NULL )
{
d_cornerWidget = new QWidget( canvas() );
d_cornerWidget->setAutoFillBackground( true );
d_cornerWidget->setPalette( plot()->palette() );
}
d_cornerWidget->show();
}
else
{
if ( d_cornerWidget )
d_cornerWidget->hide();
}
layoutScrollBars( canvas()->contentsRect() );
plot()->updateLayout();
}
/*!
Paint the contents of a QwtPlot instance into a given rectangle.
\param plot Plot to be rendered
\param painter Painter
\param plotRect Bounding rectangle
\sa renderDocument(), renderTo(), QwtPainter::setRoundingAlignment()
*/
void QwtPlotRenderer::render( QwtPlot *plot,
QPainter *painter, const QRectF &plotRect ) const
{
if ( painter == 0 || !painter->isActive() ||
!plotRect.isValid() || plot->size().isNull() )
{
return;
}
if ( !( d_data->discardFlags & DiscardBackground ) )
QwtPainter::drawBackgound( painter, plotRect, plot );
/*
The layout engine uses the same methods as they are used
by the Qt layout system. Therefore we need to calculate the
layout in screen coordinates and paint with a scaled painter.
*/
QTransform transform;
transform.scale(
double( painter->device()->logicalDpiX() ) / plot->logicalDpiX(),
double( painter->device()->logicalDpiY() ) / plot->logicalDpiY() );
QRectF layoutRect = transform.inverted().mapRect( plotRect );
if ( !( d_data->discardFlags & DiscardBackground ) )
{
// subtract the contents margins
int left, top, right, bottom;
plot->getContentsMargins( &left, &top, &right, &bottom );
layoutRect.adjust( left, top, -right, -bottom );
}
QwtPlotLayout *layout = plot->plotLayout();
int baseLineDists[QwtAxis::PosCount];
int canvasMargins[QwtAxis::PosCount];
for ( int axisPos = 0; axisPos < QwtAxis::PosCount; axisPos++ )
{
canvasMargins[ axisPos ] = layout->canvasMargin( axisPos );
if ( d_data->layoutFlags & FrameWithScales )
{
const QwtAxisId axisId( axisPos, QWT_DUMMY_ID );
QwtScaleWidget *scaleWidget = plot->axisWidget( axisId );
if ( scaleWidget )
{
baseLineDists[ axisPos ] = scaleWidget->margin();
scaleWidget->setMargin( 0 );
}
if ( !plot->isAxisVisible( axisId ) )
{
int left = 0;
int right = 0;
int top = 0;
int bottom = 0;
// When we have a scale the frame is painted on
// the position of the backbone - otherwise we
// need to introduce a margin around the canvas
switch( axisPos )
{
case QwtAxis::yLeft:
layoutRect.adjust( 1, 0, 0, 0 );
break;
case QwtAxis::yRight:
layoutRect.adjust( 0, 0, -1, 0 );
break;
case QwtAxis::xTop:
layoutRect.adjust( 0, 1, 0, 0 );
break;
case QwtAxis::xBottom:
layoutRect.adjust( 0, 0, 0, -1 );
break;
}
layoutRect.adjust( left, top, right, bottom );
}
}
}
// Calculate the layout for the document.
QwtPlotLayout::Options layoutOptions = QwtPlotLayout::IgnoreScrollbars;
if ( ( d_data->layoutFlags & FrameWithScales ) ||
( d_data->discardFlags & DiscardCanvasFrame ) )
{
layoutOptions |= QwtPlotLayout::IgnoreFrames;
}
if ( d_data->discardFlags & DiscardLegend )
layoutOptions |= QwtPlotLayout::IgnoreLegend;
if ( d_data->discardFlags & DiscardTitle )
layoutOptions |= QwtPlotLayout::IgnoreTitle;
if ( d_data->discardFlags & DiscardFooter )
layoutOptions |= QwtPlotLayout::IgnoreFooter;
layout->update( plot, layoutRect, layoutOptions );
// canvas
QwtScaleMapTable mapTable = buildCanvasMaps( plot, layout->canvasRect() );
if ( updateCanvasMargins( plot, layout->canvasRect(), mapTable ) )
{
// recalculate maps and layout, when the margins
// have been changed
layout->update( plot, layoutRect, layoutOptions );
mapTable = buildCanvasMaps( plot, layout->canvasRect() );
}
// now start painting
painter->save();
painter->setWorldTransform( transform, true );
renderCanvas( plot, painter, layout->canvasRect(), mapTable );
if ( !( d_data->discardFlags & DiscardTitle )
&& ( !plot->titleLabel()->text().isEmpty() ) )
{
renderTitle( plot, painter, layout->titleRect() );
}
if ( !( d_data->discardFlags & DiscardFooter )
&& ( !plot->footerLabel()->text().isEmpty() ) )
{
renderFooter( plot, painter, layout->footerRect() );
}
if ( !( d_data->discardFlags & DiscardLegend )
&& plot->legend() && !plot->legend()->isEmpty() )
{
renderLegend( plot, painter, layout->legendRect() );
}
for ( int axisPos = 0; axisPos < QwtAxis::PosCount; axisPos++ )
{
for ( int i = 0; i < plot->axesCount( i ); i++ )
{
const QwtAxisId axisId( axisPos, i );
QwtScaleWidget *scaleWidget = plot->axisWidget( axisId );
if ( scaleWidget )
{
int baseDist = scaleWidget->margin();
int startDist, endDist;
scaleWidget->getBorderDistHint( startDist, endDist );
renderScale( plot, painter, axisId, startDist, endDist,
baseDist, layout->scaleRect( axisId ) );
}
}
}
painter->restore();
// restore all setting to their original attributes.
for ( int axisPos = 0; axisPos < QwtAxis::PosCount; axisPos++ )
{
if ( d_data->layoutFlags & FrameWithScales )
{
const QwtAxisId axisId( axisPos, QWT_DUMMY_ID );
QwtScaleWidget *scaleWidget = plot->axisWidget( axisId );
if ( scaleWidget )
scaleWidget->setMargin( baseLineDists[axisPos] );
}
layout->setCanvasMargin( canvasMargins[axisPos] );
}
layout->invalidate();
}
