Method toPixmap

3rdparty/qcustomplot/qcustomplot.cpp:16416–16458

! Renders the plot to a pixmap and returns it. The plot is sized to \a width and \a height in pixels and scaled with \a scale. (width 100 and scale 2.0 lead to a full resolution pixmap with width 200.) \see toPainter, saveRastered, saveBmp, savePng, saveJpg, savePdf */

  \see toPainter, saveRastered, saveBmp, savePng, saveJpg, savePdf
*/
QPixmap QCustomPlot::toPixmap(int width, int height, double scale)
{
  // this method is somewhat similar to toPainter. Change something here, and a change in toPainter might be necessary, too.
  int newWidth, newHeight;
  if (width == 0 || height == 0)
  {
    newWidth = this->width();
    newHeight = this->height();
  } else
  {
    newWidth = width;
    newHeight = height;
  }
  int scaledWidth = qRound(scale*newWidth);
  int scaledHeight = qRound(scale*newHeight);

  QPixmap result(scaledWidth, scaledHeight);
  result.fill(mBackgroundBrush.style() == Qt::SolidPattern ? mBackgroundBrush.color() : Qt::transparent); // if using non-solid pattern, make transparent now and draw brush pattern later
  QCPPainter painter;
  painter.begin(&result);
  if (painter.isActive())
  {
    QRect oldViewport = viewport();
    setViewport(QRect(0, 0, newWidth, newHeight));
    painter.setMode(QCPPainter::pmNoCaching);
    if (!qFuzzyCompare(scale, 1.0))
    {
      if (scale > 1.0) // for scale < 1 we always want cosmetic pens where possible, because else lines might disappear for very small scales
        painter.setMode(QCPPainter::pmNonCosmetic);
      painter.scale(scale, scale);
    }
    if (mBackgroundBrush.style() != Qt::SolidPattern && mBackgroundBrush.style() != Qt::NoBrush) // solid fills were done a few lines above with QPixmap::fill
      painter.fillRect(mViewport, mBackgroundBrush);
    draw(&painter);
    setViewport(oldViewport);
    painter.end();
  } else // might happen if pixmap has width or height zero
  {
    qDebug() << Q_FUNC_INFO << "Couldn't activate painter on pixmap";
    return QPixmap();
  }
  return result;
}

/*!
  Renders the plot using the passed \a painter.