Method updateBufferPreviewer

gui/src/widgets/plotbufferpreviewer.cpp:101–135

}

void PlotBufferPreviewer::updateBufferPreviewer()
{
	PlotAxis *xAxis = (m_plot->selectedChannel()) ? m_plot->selectedChannel()->xAxis() : m_plot->xAxis();

	// Time interval within the plot canvas
	double left = xAxis->visibleMin();
	double right = xAxis->visibleMax();
	QwtInterval plotInterval(std::min(left, right), std::max(left, right));

	// Time interval that represents the captured data
	if(!m_manualDataLimits) {
		m_bufferDataLimitMin = xAxis->min();
		m_bufferDataLimitMax = xAxis->max();
	}
	QwtInterval dataInterval(std::min(m_bufferDataLimitMin, m_bufferDataLimitMax),
				 std::fmax(m_bufferDataLimitMin, m_bufferDataLimitMax));

	// Use the two intervals to determine the width and position of the
	// waveform and of the highlighted area
	QwtInterval fullInterval = plotInterval | dataInterval;
	double wPos = 1 - (fullInterval.maxValue() - dataInterval.minValue()) / fullInterval.width();
	double wWidth = dataInterval.width() / fullInterval.width();

	double hPos = 1 - (fullInterval.maxValue() - plotInterval.minValue()) / fullInterval.width();
	double hWidth = plotInterval.width() / fullInterval.width();

	if(left > right) {
		hPos = wWidth - hPos - hWidth;
	}

	m_bufferPreviewer->setWaveformWidth(wWidth);
	m_bufferPreviewer->setWaveformPos(wPos);
	m_bufferPreviewer->setHighlightWidth(hWidth);
	m_bufferPreviewer->setHighlightPos(hPos);
}

#include "moc_plotbufferpreviewer.cpp"