01232 {
01233     //check if threads is running
01234     if( m_threads.size() > 0 )
01235     {
01236         if( m_threads[ 0 ]->isRunning() )
01237         {
01238             QMessageBox::warning(this, tr("Threads"), tr("Current threads is running, please stop them before running a new threads!"), QMessageBox::Ok) ;
01239             return;
01240         }
01241     }
01242 
01243     if( QMessageBox::Yes != QMessageBox::warning(this, tr("Zooming...") , tr("Are you sure to zooming this area?"), QMessageBox::Yes | QMessageBox::No, QMessageBox::No ) )
01244     {
01245         return;
01246     }
01247 
01248     int w = m_config->getImageWidth();
01249     int h = m_config->getImageHeight();
01250 
01251     int minwh = w < h ? w : h;
01252 
01253     m_viewX = m_viewX + ( m_zoom * ( startx < endx ? startx : endx ) /   minwh );
01254     m_viewY = m_viewY + ( m_zoom * ( starty < endy ? starty : endy ) /   minwh );
01255     double tmpX = static_cast<double>(abs( startx - endx )) / w ;
01256     double tmpY = static_cast<double>(abs( starty - endy )) / h ;
01257 
01258     m_zoom = m_zoom * ( tmpX > tmpY ? tmpX : tmpY ) ;
01259 
01260     this->runGenerator();
01261 }