Method get_point

DSView/pv/view/analogsignal.cpp:188–220

}

QPointF AnalogSignal::get_point(uint64_t index, float &value)
{
    QPointF pt = QPointF(-1, -1);

    if (!enabled())
        return pt;

    const int order = _data->get_ch_order(get_index());
    if (order == -1)
        return pt;

    const double scale = _view->scale();
    assert(scale > 0);
    const int64_t pixels_offset = _view->offset();
    const double samplerate = _view->session().cur_snap_samplerate();
    const double samples_per_pixel = samplerate * scale;

    if (index >= _data->get_sample_count())
        return pt;

    const uint64_t ring_index = (uint64_t)(_data->get_ring_start() + floor(index)) % _data->get_sample_count();
    value = *(_data->get_samples(ring_index) + order * _data->get_unit_bytes());

    const int height = get_totalHeight();
    const float top = get_y() - height * 0.5;
    const float bottom = get_y() + height * 0.5;
    const int hw_offset = get_hw_offset();
    const float x = (index / samples_per_pixel - pixels_offset);
    const float y = min(max(top, get_zero_vpos() + (value - hw_offset)* _scale), bottom);
    pt = QPointF(x, y);

    return pt;
}

/**
 * Probe options