/*!
\brief Paint the plot into a given rectangle.
Paint the contents of a QwtPlot instance into a given rectangle.
\param painter Painter
\param plotRect Bounding rectangle
\param pfilter Print filter
\sa QwtPlotPrintFilter
*/
void QwtPlot::print(QPainter *painter, const QRect &plotRect,
const QwtPlotPrintFilter &pfilter) const
{
int axisId;
if ( painter == 0 || !painter->isActive() ||
!plotRect.isValid() || size().isNull() )
return;
painter->save();
// All paint operations need to be scaled according to
// the paint device metrics.
QwtPainter::setMetricsMap(this, painter->device());
const QwtMetricsMap &metricsMap = QwtPainter::metricsMap();
// It is almost impossible to integrate into the Qt layout
// framework, when using different fonts for printing
// and screen. To avoid writing different and Qt unconform
// layout engines we change the widget attributes, print and
// reset the widget attributes again. This way we produce a lot of
// useless layout events ...
pfilter.apply((QwtPlot *)this);
int baseLineDists[QwtPlot::axisCnt];
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintCanvasBackground) )
{
// In case of no background we set the backbone of
// the scale on the frame of the canvas.
for (axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
{
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if ( scaleWidget )
{
baseLineDists[axisId] = scaleWidget->baseLineDist();
scaleWidget->setBaselineDist(0);
}
}
}
// Calculate the layout for the print.
int layoutOptions = QwtPlotLayout::IgnoreScrollbars
| QwtPlotLayout::IgnoreFrames;
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintMargin) )
layoutOptions |= QwtPlotLayout::IgnoreMargin;
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintLegend) )
layoutOptions |= QwtPlotLayout::IgnoreLegend;
((QwtPlot *)this)->plotLayout()->activate(this,
QwtPainter::metricsMap().deviceToLayout(plotRect),
layoutOptions);
if ((pfilter.options() & QwtPlotPrintFilter::PrintTitle)
&& (!titleLabel()->text().isEmpty()))
{
printTitle(painter, plotLayout()->titleRect());
}
if ( (pfilter.options() & QwtPlotPrintFilter::PrintLegend)
&& legend() && !legend()->isEmpty() )
{
printLegend(painter, plotLayout()->legendRect());
}
for ( axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
{
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if (scaleWidget)
{
int baseDist = scaleWidget->baseLineDist();
int startDist, endDist;
scaleWidget->getBorderDistHint(startDist, endDist);
printScale(painter, axisId, startDist, endDist,
baseDist, plotLayout()->scaleRect(axisId));
}
}
const QRect canvasRect = metricsMap.layoutToDevice(plotLayout()->canvasRect());
// When using QwtPainter all sizes where computed in pixel
// coordinates and scaled by QwtPainter later. This limits
// the precision to screen resolution. A much better solution
// is to scale the maps and print in unlimited resolution.
QwtArray<QwtScaleMap> map(axisCnt);
for (axisId = 0; axisId < axisCnt; axisId++)
{
map[axisId].setTransformation(axisScaleEngine(axisId)->transformation());
const QwtScaleDiv &scaleDiv = *axisScaleDiv(axisId);
map[axisId].setScaleInterval(scaleDiv.lBound(), scaleDiv.hBound());
double from, to;
if ( axisEnabled(axisId) )
{
const int sDist = axisWidget(axisId)->startBorderDist();
const int eDist = axisWidget(axisId)->endBorderDist();
const QRect &scaleRect = plotLayout()->scaleRect(axisId);
if ( axisId == xTop || axisId == xBottom )
{
from = metricsMap.layoutToDeviceX(scaleRect.left() + sDist);
to = metricsMap.layoutToDeviceX(scaleRect.right() - eDist);
}
else
{
from = metricsMap.layoutToDeviceY(scaleRect.bottom() - sDist);
to = metricsMap.layoutToDeviceY(scaleRect.top() + eDist);
}
}
else
{
const int margin = plotLayout()->canvasMargin(axisId);
const QRect &canvasRect = plotLayout()->canvasRect();
if ( axisId == yLeft || axisId == yRight )
{
from = metricsMap.layoutToDeviceX(canvasRect.bottom() - margin);
to = metricsMap.layoutToDeviceX(canvasRect.top() + margin);
}
else
{
from = metricsMap.layoutToDeviceY(canvasRect.left() + margin);
to = metricsMap.layoutToDeviceY(canvasRect.right() - margin);
}
}
map[axisId].setPaintXInterval(from, to);
}
// The canvas maps are already scaled.
QwtPainter::setMetricsMap(painter->device(), painter->device());
printCanvas(painter, canvasRect, map, pfilter);
QwtPainter::resetMetricsMap();
((QwtPlot *)this)->plotLayout()->invalidate();
// reset all widgets with their original attributes.
if ( !(pfilter.options() & QwtPlotPrintFilter::PrintCanvasBackground) )
{
// restore the previous base line dists
for (axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
{
QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(axisId);
if ( scaleWidget )
scaleWidget->setBaselineDist(baseLineDists[axisId]);
}
}
pfilter.reset((QwtPlot *)this);
painter->restore();
}
