Method invalidate_

src/openms_gui/source/VISUAL/HistogramWidget.cpp:226–282

  }

  void HistogramWidget::invalidate_()
  {
    //apply log trafo if needed
    Math::Histogram<> dist(dist_);
    if (log_mode_)
    {
      dist.applyLogTransformation(100.0);
    }

    QPainter painter(&buffer_);
    buffer_.fill(palette().window().color());
    UInt w = buffer_.width();
    UInt h = buffer_.height();
    UInt pen_width = std::min(margin_, UInt(0.5 * w / dist.size()));

    //draw distribution
    QPen pen;
    pen.setWidth(pen_width);
    pen.setColor(QColor(100, 125, 175));
    painter.setPen(pen);

    for (Size i = 0; i < dist.size(); ++i)
    {
      if (dist[i] != 0)
      {
        UInt bin_pos = UInt((double(i) / (dist.size() - 1)) * (w - margin_));
        UInt bin_height = UInt(((double)dist[i] / dist.maxValue()) * (h - margin_));
        painter.drawLine(bin_pos + 1, h, bin_pos + 1, h - bin_height);
      }
    }

    //calculate total intensity
    double total_sum = 0;
    for (Size i = 0; i < dist.size(); ++i)
    {
      total_sum += dist[i];
    }

    // draw part of total intensity
    painter.setPen(Qt::red);
    QPoint last_point(1, h);
    QPoint point;
    double int_sum = 0;
    for (Size i = 0; i < dist.size(); ++i)
    {
      int_sum += dist[i];
      point.setX(UInt((double(i) / (dist.size() - 1)) * (w - margin_)));
      point.setY(UInt((1 - (int_sum / total_sum)) * (h - margin_) + margin_));
      painter.drawLine(last_point, point);
      last_point = point;
    }
    // draw coord system (on top distribution)
    painter.setPen(Qt::black);
    painter.drawLine(0, h - 1, w - margin_ + Int(0.5 * pen_width), h - 1);

    update();
  }