缩放光标位置Qt

Question

我有一个应用，我想缩放光标位置。现在，它将放大图像的中心。 注意1：我使用pos.x（）和pos.y（）确定并打印光标的位置。 注意2：scaleImage（0.25）表示放大25％。  这是放大功能：

void ImageView::zoomIn()
{
  QPoint pos = QCursor::pos();
    printf("pos: %d, %d \n", pos.x(), pos.y());
  if(m_scaleFactor >= 12)
    return;
  if (m_visibleImg.size() == m_image.size() &&
      (m_scrollArea->horizontalScrollBar()->pageStep() * 3 < m_scrollArea->horizontalScrollBar()->maximum() ||
       m_scrollArea->verticalScrollBar()->pageStep() * 3 < m_scrollArea->verticalScrollBar()->maximum()) &&
      m_scaleFactor >= 2.25)
  {
    int maxh = m_scrollArea->horizontalScrollBar()->maximum();
    int maxv = m_scrollArea->verticalScrollBar()->maximum();
    int valh = m_scrollArea->horizontalScrollBar()->value();
    int valv = m_scrollArea->verticalScrollBar()->value();

    m_numImage = selectImage(maxh, maxv, valh, valv);
    m_imageLabel->setNumImg(m_numImage);
    m_visibleImg = m_image.copy(m_vectDimImg.at(m_numImage));
    double Hscale = INT_MAX;
    if(valh != 0)
      Hscale = maxh / valh;
    double Vscale = INT_MAX;
    if(valv != 0)
      Vscale = maxv / valv;

    scaleImage(0.25);

    m_scrollArea->horizontalScrollBar()->setValue(m_scrollArea->horizontalScrollBar()->maximum() / Hscale);
    m_scrollArea->verticalScrollBar()->setValue(m_scrollArea->verticalScrollBar()->maximum() / Vscale);

  }
  else
  {
    scaleImage(0.25);
  }


}

scaleImage函数如下所示：

void ImageView::scaleImage(double factor, bool keepScroll)
{
  QPoint pos = QCursor::pos();
  m_scaleFactor += factor;

  int maxH = m_scrollArea->horizontalScrollBar()->maximum();
  int maxV = m_scrollArea->verticalScrollBar()->maximum();
  //if(m_visibleImg.size() )
  //m_visibleImg = m_image.copy(m_vectDimImg.at(m_numImage));

  if(m_visibleImg.isNull())
    return;

  QImage tmp = m_visibleImg;
  if(!m_imageLabel->getVideoIsPlaying())
    lightAdjust(tmp, m_lightFactor);

  QPixmap pix = QPixmap::fromImage(tmp);
  m_imageLabel->setPixmap(pix.scaled(m_scaleFactor * pix.size()));
  //  m_imageLabel->resize(m_imageLabel->pixmap()->size());
  m_imageLabel->adjustSize();

  if(keepScroll)
  {
    m_scrollArea->horizontalScrollBar()->setValue(m_scrollHorValue);
    m_scrollArea->verticalScrollBar()->setValue(m_scrollVerValue);
  }


  else if(factor != 0)
  {
     adjustScrollBar(m_scrollArea->horizontalScrollBar(), maxH, factor);
     adjustScrollBar(m_scrollArea->verticalScrollBar(), maxV, factor);



  }

  m_zoomInAct->setEnabled(m_scaleFactor < 12.0);
  m_zoomOutAct->setEnabled(m_scaleFactor > 0.25);
}

我将不胜感激！ ：）