void
TracingItem::clearCursor(void)
{
// immediately clear any current visible selections
for (int index = 0; index < my.selections.size(); index++) {
QwtPlotDirectPainter directPainter;
directPainter.drawSeries(my.pointCurve, index, index);
}
my.selections.clear();
my.selectionInfo.clear();
}
void
TracingItem::updateCursor(const QPointF &, int index)
{
Q_ASSERT(index <= my.points.size());
Q_ASSERT(index <= (int)my.pointCurve->dataSize());
my.selections.append(my.points.at(index));
my.selectionInfo.append(my.events.at(index).description());
// required for immediate chart update after selection
QBrush pointBrush = my.pointSymbol->brush();
my.pointSymbol->setBrush(my.selectionSymbol->brush());
QwtPlotDirectPainter directPainter;
directPainter.drawSeries(my.pointCurve, index, index);
my.pointSymbol->setBrush(pointBrush);
}
// Hightlight the selected point
void CanvasPicker::showCursor( bool showIt )
{
if ( !d_selectedCurve )
return;
QwtSymbol *symbol = const_cast<QwtSymbol *>( d_selectedCurve->symbol() );
const QBrush brush = symbol->brush();
if ( showIt )
symbol->setBrush( symbol->brush().color().dark( 180 ) );
QwtPlotDirectPainter directPainter;
directPainter.drawSeries( d_selectedCurve, d_selectedPoint, d_selectedPoint );
if ( showIt )
symbol->setBrush( brush ); // reset brush
}