Method paint_mid

DSView/pv/view/analogsignal.cpp:395–452

}

void AnalogSignal::paint_mid(QPainter &p, int left, int right, QColor fore, QColor back)
{
    (void)fore;
    (void)back;

    assert(_data);
    assert(_view);
    assert(right >= left);

    const int height = get_totalHeight();
    const float top = get_y() - height * 0.5;
    const float bottom = get_y() + height * 0.5;
    const float zeroY = ratio2pos(get_zero_ratio());
    const int width = right - left + 1;

    const double scale = _view->scale();

    assert(scale > 0);
    const int64_t offset = _view->offset();

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

    //The channel have no data.
    if (_data->has_enabled_channel(get_index()) == false){
        return;
    }

    const double pixels_offset = offset;
    const double samplerate = _data->samplerate();
    const int64_t cur_sample_count = _data->get_sample_count();
    const double samples_per_pixel = samplerate * scale;
    const uint64_t ring_start = _data->get_ring_start();

    int64_t start_pixel;
    uint64_t start_index;
    const double index_offset = pixels_offset * samples_per_pixel;
    start_index = (uint64_t)(ring_start + floor(index_offset)) % cur_sample_count;
    start_pixel = (floor(index_offset) - index_offset) / samples_per_pixel ;

    int64_t show_length = min(floor(cur_sample_count - floor(index_offset)), ceil(width*samples_per_pixel + 1));
    if (show_length <= 0)
        return;

    if (samples_per_pixel < EnvelopeThreshold){
        paint_trace(p, _data, zeroY,
            start_pixel, start_index, show_length,
            samples_per_pixel, order,
            top, bottom, width);
    }
    else{
        paint_envelope(p, _data, zeroY,
            start_pixel, start_index, show_length,
            samples_per_pixel, order,
            top, bottom, width);
    }
}