GraphicsScene Background repainting

[manojmka]

Hi guys,

I want to have a grid on my graphicsScene of customized size. I have a serious problem with GraphicsScene background drawing. I have implemented the drawBackground() function in my graphicsScene class as follows:

painter->drawRect(rect);
if(gridSize>0)
{
   painter->setOpacity(0.1);
   for(int i=0;i<rect.width();i+=gridSize)
     painter->drawLine(i,0,i,rect.height());
   for(int i=0;i<rect.height();i+=gridSize)
     painter->drawLine(0,i,rect.width(),i);
}

painter->drawRect(rect);
if(gridSize>0)
{
   painter->setOpacity(0.1);
   for(int i=0;i<rect.width();i+=gridSize)
     painter->drawLine(i,0,i,rect.height());
   for(int i=0;i<rect.height();i+=gridSize)
     painter->drawLine(0,i,rect.width(),i);
}

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The grid is repainted every time I move, resize, rotate any item on the scene. And this repainting leaves some extra lines drawn on the scene?? It looks very ugly. Please help me as this is urgent!!

Regards,
Manoj