Russian Qt Forum

C++ (Qt)
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
 
    //-------------------Scene create---------------------------
    scene = new QGraphicsScene((this));
    scene->setSceneRect(QRectF(0, 0, 6400, 6400));
    view = new QGraphicsView(scene);
    view->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
    EllipseCraft = new QGraphicsEllipseItem(0,0,5,5);
 
    //------------------Drawing......-----------------------------
       ......................................
}
 

C++ (Qt)
 
PlaneViewer::PlaneViewer(QGraphicsScene *scene, QWidget *parent)
    : QGraphicsView(scene, parent)
{
    m_scene = scene;
    gridKf = 256;
}
void PlaneViewer::paintEvent(QPaintEvent *event)
{
    for(int i = 0; i < 6400; i+=gridKf)
    {
        QGraphicsLineItem *LineV = m_scene->addLine(i, 0, i, 6400);
        QGraphicsLineItem *LineH = m_scene->addLine(0, i, 6400, i);
    }
}
 

C++ (Qt)
void PlaneViewer::paintEvent(QPaintEvent *event)
{
     for(int i = 0; i < 6400; i+=gridKf)
     {
        QGraphicsLineItem *LineV = m_scene->addLine(i, 0, i, 6400);
        QGraphicsLineItem *LineH = m_scene->addLine(0, i, 6400, i);
     }
}

C++ (Qt)
virtual void QGraphicsView::drawBackground ( QPainter * painter, const QRectF & rect )

C++ (Qt)
virtual void QGraphicsView::drawForeground ( QPainter * painter, const QRectF & rect )
{
    for(int i = 0; i < scene()->width(); i+=gridKf)
    {
        painter->drawLine(i, 0, i, scene()->height());
        painter->drawLine(0, i, scene()->width(), i);
    }
}