QImage in a QGraphics scene
I am quite new to Qt. I am having troubles in inserting a QImag开发者_开发知识库e
to a scene. Could somebody please tell me how to add a QImage
to a QGraphicsScene
?
For this you would use a QGraphicsPixmapItem
that you add to the scene like any other QGraphicsItem
.
The QGraphicsPixmapItem
can be initialized with a QPixmap
which is a device-dependent representation of a bitmap and you can get it from a QImage
for example with the static function QPixmap::fromImage()
.
Update (example code)
#include <QtGlobal>
#if QT_VERSION >= 0x050000
#include <QtWidgets>
#else
#include <QtGui>
#endif
int main(int argc, char *argv[]) {
QApplication a(argc, argv);
QImage image("test.png");
QGraphicsPixmapItem item( QPixmap::fromImage(image));
QGraphicsScene* scene = new QGraphicsScene;
scene->addItem(&item);
QGraphicsView view(scene);
view.show();
return a.exec();
}
As @Neal suggested, addPixmap works much simpler and where the QGraphicsPixmapItem would not work for me for some unknown reason. Assuming you have a QGraphicsScene
, QGraphicView
and rest of program set up the below code will just display the image:
QString filename = "C:/image.png";
QImage image(fileName);
scene->addPixmap( QPixmap::fromImage(image));
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