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//map.h

#include <QGraphicsItem>
#include <QPainter>

class Map : public QGraphicsRectItem
{

public:
	Map(QImage img);
	~Map();

	void paint(QPainter *painter,
		const QStyleOptionGraphicsItem *option,
		QWidget *widget);

private:
	QImage image;	
};

#include <QStyleOptionGraphicsItem>

#include "map.h"

Map::Map(QImage img) : image(img)
{

}

Map::~Map()
{

}

void Map::paint(QPainter *painter,
						  const QStyleOptionGraphicsItem *option,
						  QWidget *widget)
{
	painter->drawImage( option->exposedRect, image, option->exposedRect, Qt::OrderedAlphaDither );
}

#include "map.h"
...
	canvas = new QGraphicsScene();
	editor = new QGraphicsView(canvas, ui.centralwidget);
	editor->setDragMode(QGraphicsView::RubberBandDrag);

	ui.vboxLayout->addWidget(editor);
...
                 // Вот это работает
	QAbstractGraphicsShapeItem* i = canvas->addEllipse(QRectF(0,0,50,50));
	i->setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
	i->setPen(Qt::NoPen);
	i->setBrush( QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8) );
	i->setPos(qrand()%int(canvas->width()), qrand()%int(canvas->height()));
	i->setZValue(qrand()%256);

...

	QString logo_fn = "qtlogo.png";
	QImage logoimg;
	logoimg.load(logo_fn);

                // А вот это нет
	Map *map = new Map(logoimg);
	map->setFlags(QGraphicsItem::ItemIsMovable | QGraphicsItem::ItemIsSelectable);
	map->setPen(Qt::NoPen);
	map->setBrush( QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8) );
	map->setPos(qrand()%int(canvas->width()), qrand()%int(canvas->height()));
	map->setZValue(qrand()%256);

	canvas->addItem(map);