hi , i'm new to qt
i have low speed in this app
please help

Qt Code: 
  1. void MainWindow::LoadGages(void)
  2. {
  3.     QImage sb_img(":/new/prefix1/spb");
  4.     QImage tb_img(":/new/prefix1/tkb");
  5.     QImage nd_img(":/new/prefix1/nd");
  6.     QImage cn_img(":/new/prefix1/cen");
  7.     QImage ov_img(":/new/prefix1/ov");
  8.  
  9.     sb  = sb.fromImage(sb_img.scaled(450,450,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
  10.     tb  = tb.fromImage(tb_img.scaled(450,450,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
  11.     nd  = nd.fromImage(nd_img.scaled(146,115,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
  12.     cn  = cn.fromImage(cn_img.scaled(41,41,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
  13.     ov  = ov.fromImage(ov_img.scaled(400,325,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
  14.  
  15.     speed=103;
  16.     takho=103;
  17.  
  18.     qreal alpha=0.0;
  19.  
  20.     for(qreal roty=270;roty<=360;roty+=5)
  21.     {
  22.         QPixmap Left=drawGauge(sb,speed,450,0,0,roty,225,225,alpha);
  23.         QPixmap Right=drawGauge(tb,speed,450,0,0,-roty,225,225,alpha);
  24.         alpha+=0.15;
  25.         ui->label->setPixmap(drawBoth(Left,Right));
  26.         QApplication::processEvents();
  27.     }
  28.  
  29.     for(qreal val=103;val<=370;val+=5)
  30.     {
  31.         QPixmap Left=drawGauge(sb,val,450,0,0,0,0,0,1.0);
  32.         QPixmap Right=drawGauge(tb,val,450,0,0,0,0,0,1.0);
  33.         ui->label->setPixmap(drawBoth(Left,Right));
  34.         QApplication::processEvents();
  35.     }
  36.  
  37.     for(qreal val=370;val>=103;val-=5)
  38.     {
  39.         QPixmap Left=drawGauge(sb,val,450,0,0,0,0,0,1.0);
  40.         QPixmap Right=drawGauge(tb,val,450,0,0,0,0,0,1.0);
  41.         ui->label->setPixmap(drawBoth(Left,Right));
  42.         QApplication::processEvents();
  43.     }
  44.  
  45.     QPixmap Left=drawGauge(sb,103,450,0,0,0,0,0,1.0);
  46.     QPixmap Right=drawGauge(tb,103,450,0,0,0,0,0,1.0);
  47.     ui->label->setPixmap(drawBoth(Left,Right));
  48.  
  49.     //timerId=startTimer(1);
  50.     update();
  51. }
  52.  
  53. QPixmap MainWindow::drawBoth(QPixmap g1,QPixmap g2)
  54. {
  56.     QPixmap win(ui->label->size());
  57.     win.fill(Qt::transparent);
  58.     QRect winR(ui->label->x(),ui->label->y(),ui->label->width(),ui->label->height());
  59.     p.begin(&win);
  60.     p.setRenderHint(QPainter::Antialiasing);
  61.     p.setRenderHint(QPainter::SmoothPixmapTransform);
  62.     p.setRenderHint(QPainter::HighQualityAntialiasing);
  63.  
  64.     p.drawPixmap(10,25,g1);
  65.     p.drawPixmap(winR.x()+winR.width()-450-75,25,g2);
  66.  
  67.     p.end();
  68.     return win;
  69. }
  70.  
  71. QPixmap MainWindow::drawGauge(QPixmap Gauge,qreal value,int scale,qreal z,qreal x,qreal y,qreal tx,qreal ty,qreal alpha)
  72. {
  74.     QPixmap win(Gauge.size());
  75.     win.fill(Qt::transparent);
  76.     p.begin(&win);
  77.     p.setRenderHint(QPainter::Antialiasing);
  78.     p.setRenderHint(QPainter::SmoothPixmapTransform);
  79.     p.setRenderHint(QPainter::HighQualityAntialiasing);
  80.     p.drawPixmap(0,0,Gauge);
  81.     p.setTransform(GetRotation(value,Qt::ZAxis,(450/2)+5,(450/2)+5));
  82.     p.setViewport(p.viewport().x()-5,p.viewport().y()-5,p.viewport().width(),p.viewport().height());
  83.     p.drawPixmap(450/2,450/2,nd);
  84.     p.resetMatrix();
  85.     p.drawPixmap((450/2)-20,(450/2)-20,cn);
  86.     p.setOpacity(0.2);
  87.     p.drawPixmap(25,25,ov);
  88.     p.end();
  89.  
  90.     QPixmap gauge=win;
  91.     win.fill(Qt::transparent);
  92.     p.begin(&win);
  93.     p.setRenderHint(QPainter::Antialiasing);
  94.     p.setRenderHint(QPainter::SmoothPixmapTransform);
  95.     p.setRenderHint(QPainter::HighQualityAntialiasing);
  96.     p.setTransform(GetRotation(z,Qt::ZAxis,tx,ty));
  97.     p.drawPixmap(0,0,gauge);
  98.     p.end();
  99.  
  100.     gauge=win;
  101.     win.fill(Qt::transparent);
  102.     p.begin(&win);
  103.     p.setRenderHint(QPainter::Antialiasing);
  104.     p.setRenderHint(QPainter::SmoothPixmapTransform);
  105.     p.setRenderHint(QPainter::HighQualityAntialiasing);
  106.     p.setTransform(GetRotation(x,Qt::XAxis,tx,ty));
  107.     p.drawPixmap(0,0,gauge);
  108.     p.end();
  109.  
  110.     gauge=win;
  111.     win.fill(Qt::transparent);
  112.     p.begin(&win);
  113.     p.setRenderHint(QPainter::Antialiasing);
  114.     p.setRenderHint(QPainter::SmoothPixmapTransform);
  115.     p.setRenderHint(QPainter::HighQualityAntialiasing);
  116.     p.setTransform(GetRotation(y,Qt::YAxis,tx,ty));
  117.     p.setOpacity(alpha);
  118.     p.drawPixmap(0,0,gauge);
  119.     p.end();
  120.  
  121.     gauge=win;
  122.     win.fill(Qt::transparent);
  123.     p.begin(&win);
  124.     p.setRenderHint(QPainter::Antialiasing);
  125.     p.setRenderHint(QPainter::SmoothPixmapTransform);
  126.     p.setRenderHint(QPainter::HighQualityAntialiasing);
  127.     p.setOpacity(alpha);
  128.     p.drawPixmap(0,0,gauge);
  129.     p.end();
  130.  
  131.     QImage _retval = win.toImage();
  132.     QPixmap retval = retval.fromImage(_retval.scaled(scale,scale,Qt::IgnoreAspectRatio,Qt::SmoothTransformation));
  133.  
  134.     return retval;
  135. }
  136.  
  137. QTransform MainWindow::GetRotation(qreal rotation,Qt::Axis axis,qreal dx,qreal dy)
  138. {
  139.     QTransform qtr;
  140.     qtr.translate(dx,dy);
  141.     qtr.rotate(rotation,axis);
  142.     qtr.translate(-dx,-dy);
  143.     return qtr;
  144. }
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