How to use a QPixmap as an object in DiagramScene?

frnklu20

I'm kind of adapting the DiagramScene example(it's on qt the site)
But in the project it uses a QPolygon as an object, but i want to use a Pixmap instead.
It's a program composed by some classes:
diagramitem is responsible fot the items that we will place on the screen
diagramscene handles the act of placing an object on the screen

I thought that it is i little bit confusing the that qt did it, but ok

diagramitem.cpp

DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
             QGraphicsItem *parent)
    : QGraphicsPolygonItem(parent)
{
    QPainter *painter=new QPainter;
    myDiagramType = diagramType;
    myContextMenu = contextMenu;

    QPainterPath path;
    switch (myDiagramType) {
        case StartEnd:
            path.moveTo(200, 50);
            path.arcTo(150, 0, 50, 50, 0, 90);
            path.arcTo(50, 0, 50, 50, 90, 90);
            path.arcTo(50, 50, 50, 50, 180, 90);
            path.arcTo(150, 50, 50, 50, 270, 90);
            path.lineTo(200, 25);
            myPolygon = path.toFillPolygon();
            break;
        case Conditional:
            path.addEllipse(QPoint(0,0),50,50);
            path.addEllipse(QPoint(50,0),50,50);
            myPolygon=path.toFillPolygon();

            break;
        case Step:
            myPolygon << QPointF(-100, -100) << QPointF(100, -100)
                      << QPointF(100, 100) << QPointF(-100, 100)
                      << QPointF(-100, -100);
            break;
        default:
            myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
                      << QPointF(120, 80) << QPointF(70, -80)
                      << QPointF(-120, -80);
            break;
    }
    setPolygon(myPolygon);
    setFlag(QGraphicsItem::ItemIsMovable, true);
    setFlag(QGraphicsItem::ItemIsSelectable, true);
    setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
}

void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    scene()->clearSelection();
    setSelected(true);
    myContextMenu->exec(event->screenPos());
} //i didn't understand what this function means

diagramscene.cpp

DiagramScene::DiagramScene(QMenu *itemMenu, QObject *parent)
    : QGraphicsScene(parent)
{
    myItemMenu = itemMenu;
    myMode = MoveItem;
    myItemType = DiagramItem::Step;
    line = 0;
    textItem = 0;
    myItemColor = Qt::white;
    myTextColor = Qt::black;
    myLineColor = Qt::black;
}

void DiagramScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
    if (mouseEvent->button() != Qt::LeftButton)
        return;

    DiagramItem *item;
    switch (myMode) {
        case InsertItem:
            
            item = new DiagramItem(myItemType, myItemMenu);
            item->setBrush(myItemColor);
            addItem(item);
            item->setPos(mouseEvent->scenePos());
            emit itemInserted(item);
            break;
  ...
  }

how can i create a myitemtype object with a pixmap instead of a polygon?

SGaist

Hi,

In that case, why not use a QGraphicsPixmapItem ?

frnklu20

I did this but i don't know if i'm right

diagramitem.h

class DiagramItem : public QGraphicsPixmapItem 
//now its from QGraphicsPixmapItem
{
public:
....
QPixmap polygon() const { return myPolygon; }
....
private:
    DiagramType myDiagramType;
    QPixmap myPolygon;
    QMenu *myContextMenu;
    QList<Line *> arrows;
};

now i'm using a pixmap as "myPolygon" instead of using QPolygonF

diagramitem.cpp

DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
             QGraphicsItem *parent)
    : QGraphicsPixmapItem(parent)
{
    myDiagramType = diagramType;
    myContextMenu = contextMenu;

    QPainterPath path;
    switch (myDiagramType) {
        case StartEnd:{
            QPixmap pixmap("C:/Users/ILHA4/Desktop/diagrama_unifilar/trafo");
            myPolygon = pixmap;
            break;
    }
    case Conditional:{
            QPixmap pixmap2("C:/Users/ILHA4/Desktop/diagrama_unifilar/gerador");
            myPolygon=pixmap2;
            break;
    }
    case Step:{
            QPixmap pixmap3("C:/Users/ILHA4/Desktop/diagrama_unifilar/barramento");
            myPolygon=pixmap3;
            break;
    }
    default:{
            QPixmap pixmap4("C:/Users/ILHA4/Desktop/diagrama_unifilar/carga");
            myPolygon=pixmap4;
            break;
    }
    }
   setPixmap(myPolygon);
    setFlag(QGraphicsItem::ItemIsMovable, true);
    setFlag(QGraphicsItem::ItemIsSelectable, true);
    setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
}

that's it, am i doing something wrong?