C++ QwtPlotItemList::at方法代码示例

    /*!
     * \brief Update chart waveforms visibility (ChartView)
     *
     * This method updates the chart waveforms visibility according to the
     * user input.
     */
    void SidebarChartsBrowser::updateChartView()
    {
        // Get the current view
        DocumentViewManager *manager = DocumentViewManager::instance();
        ChartView *view = static_cast<ChartView*>(manager->currentView()->toWidget());

        // Set waveforms visibility
        QwtPlotItemList list = view->itemList(QwtPlotItem::Rtti_PlotCurve);
        for(int i=0; i<list.size(); ++i) {
            list.at(i)->setVisible(m_model->m_chartSeriesMap[list.at(i)->title().text()]);
        }

        view->replot();
    }

    /*!
     * \brief Update ChartSeries map
     *
     * This method updates the waveforms list given a ChartView. This is
     * usually used when changing between views to keep the list of available
     * waveforms synchronized with the currently selected chart.
     */
    void SidebarChartsBrowser::updateChartSeriesMap()
    {
        // Get the current view
        DocumentViewManager *manager = DocumentViewManager::instance();
        ChartView *view = static_cast<ChartView*>(manager->currentView()->toWidget());

        // Populate the waveforms list
        QwtPlotItemList list = view->itemList(QwtPlotItem::Rtti_PlotCurve);
        m_chartSeriesMap.clear();
        for(int i=0; i<list.size(); ++i) {
            m_chartSeriesMap.insert(list.at(i)->title().text(),
                                    list.at(i)->isVisible());
        }

        // Create a new table model
        m_model = new SidebarChartsModel(m_chartSeriesMap, this);  //! \todo What happens with the old pointer??? Should we destroy it first?
        m_proxyModel->setSourceModel(m_model);

        // Resize the table columns to fit the contents. This must be done
        // here instead of the constructor because the columns are created
        // here when filling the model (in the constructor the columns do
        // not yet exist, resulting in a crash if resized there).
        m_tableView->horizontalHeader()->setSectionResizeMode(1, QHeaderView::Stretch);
    }

void QwtCustomPlotPicker::drawRubberBand(QPainter* painter) const
{
	if ( rubberBand() < UserRubberBand )
		QwtPlotPicker::drawRubberBand( painter );
	else
	{
		if ( !isActive() || rubberBandPen().style() == Qt::NoPen )
			return;

		QPolygon p = selection();

		if ( p.count() != 1 )
			return;

		const QPoint& pt1 = p[0];
		const double x_val = plot()->invTransform(QwtPlot::xBottom,pt1.x()); // determine x value (time or dist)
		
		// Draw vertical line where curser is
		const int bot = 400;
		const int top = 0;
		painter->drawLine(pt1.x(), bot, pt1.x(), top); 

		// Set pen and fond for all coming text
		painter->setPen(QColor(Qt::black));
		painter->setFont(QFont("Helvetica", 8, QFont::Bold));
		
		// Compute the index based on the x value
		int idx;
		if (_x_axis_units == TimeAxis)
		{
			painter->drawText(QPoint(pt1.x()-65, 10), "time: " + DataProcessing::minsFromSecs(x_val));
			idx = _data_log->indexFromTime(x_val);
		}
		else if (_x_axis_units == DistAxis)
		{
			painter->drawText(QPoint(pt1.x()-60, 10), "dist: " + DataProcessing::kmFromMeters(x_val,2));
			idx = _data_log->indexFromDist(x_val);
		}
		
		// Using the index, determine the curve values
		const double hr = (int)_data_log->heartRateFltd(idx);
		const QPoint pt1_hr(pt1.x(),plot()->transform(QwtPlot::yLeft,hr));
		const double speed = _data_log->speedFltd(idx);
		const QPoint pt1_speed(pt1.x(),plot()->transform(QwtPlot::yLeft,speed));
		const double alt = (int)_data_log->altFltd(idx);
		const QPoint pt1_alt(pt1.x(),plot()->transform(QwtPlot::yRight,alt));
		const double cadence = (int)_data_log->cadenceFltd(idx);
		const QPoint pt1_cadence(pt1.x(),plot()->transform(QwtPlot::yLeft,cadence));
		const double power = _data_log->powerFltd(idx);
		const QPoint pt1_power(pt1.x(),plot()->transform(QwtPlot::yLeft,power));
		const double temp = _data_log->temp(idx);
		const QPoint pt1_temp(pt1.x(),plot()->transform(QwtPlot::yLeft,temp));

		// Draw highlights on all curves
		const QPoint offset(8,-5);
		const QwtPlotItemList item_list = plot()->itemList(QwtPlotCurve::Rtti_PlotCurve);
		for (int i = 0; i < item_list.size(); ++i) 
		{
			if (item_list.at(i)->title().text() == "Heart Rate" && item_list.at(i)->isVisible())
			{
				painter->drawLine(pt1_hr.x(), pt1_hr.y(), pt1_hr.x()+6, pt1_hr.y());
				painter->drawText(pt1_hr + offset, QString::number(hr,'g',3));
			}
			if (item_list.at(i)->title().text() == "Speed" && item_list.at(i)->isVisible())
			{
				painter->drawLine(pt1_speed.x(), pt1_speed.y(), pt1_speed.x()+6, pt1_speed.y());
				painter->drawText(pt1_speed + offset, QString::number(speed,'g',3));
			}
			if (item_list.at(i)->title().text() == "Elevation" && item_list.at(i)->isVisible())
			{
				painter->drawLine(pt1_alt.x(), pt1_alt.y(), pt1_alt.x()+6, pt1_alt.y());
				painter->drawText(pt1_alt + offset, QString::number(alt,'g',4));
			}
			if (item_list.at(i)->title().text() == "Cadence" && item_list.at(i)->isVisible())
			{
				painter->drawLine(pt1_cadence.x(), pt1_cadence.y(), pt1_cadence.x()+6, pt1_cadence.y());
				painter->drawText(pt1_cadence + offset, QString::number(cadence,'g',3));
			}
			if (item_list.at(i)->title().text() == "Power" && item_list.at(i)->isVisible())
			{
				painter->drawLine(pt1_power.x(), pt1_power.y(), pt1_power.x()+6, pt1_power.y());
				painter->drawText(pt1_power + offset, QString::number(power,'g',3));
			}
			if (item_list.at(i)->title().text() == "Temp" && item_list.at(i)->isVisible())
			{
				painter->drawLine(pt1_temp.x(), pt1_temp.y(), pt1_temp.x()+6, pt1_temp.y());
				painter->drawText(pt1_temp + offset, QString::number(temp,'g',3));
			}

			// Draw current values on graph labels
			if (_hr_cb->isChecked())
				_hr_cb->setText("Heart Rate " + QString::number(hr,'g',3).leftJustified(3,' ') + " bpm");
			else
				_hr_cb->setText("Heart Rate");
			if (_speed_cb->isChecked())
				_speed_cb->setText("Speed " + QString::number(speed,'g',3) + " km/h");
			else
				_speed_cb->setText("Speed");
			if (_alt_cb->isChecked())
				_alt_cb->setText("Elevation " + QString::number(alt,'g',4).leftJustified(4,' ') + " m");
//.........这里部分代码省略.........