Reflection Question ...

ahura_24

hi every body . i try write "drawing window" and i use qgraphicsscene and qgraphicsitems like rectitem, ellipseitem, ....
i want to reflect graphicsitem in relation to Y axis or X axis .
tnx alot :)

bodzio131

What about QGraphicsItemAnimation?

Chris Kawa

X: Scale on x axis to -1 and translate by height.
Y: Scale on y axis to -1 and translate by width.

ahura_24

can you explain to me please ?

Chris Kawa

@
QPixmap batman("./batman.png");

QGraphicsScene* scene = new QGraphicsScene();
QGraphicsPixmapItem* normalItem = scene->addPixmap(batman);
QGraphicsPixmapItem* mirrorItem = scene->addPixmap(batman);

QGraphicsScale* scale = new QGraphicsScale(scene);
scale->setXScale(-1.0);

mirrorItem->setTransformations(QList<QGraphicsTransform*>() << scale);

ui->graphicsView->setScene(scene);

@
gives you this:
!http://img37.imageshack.us/img37/1167/batmanzq.jpg(batman picture)!

ahura_24

hahah too sweet :D tnx a lot
does exist ebook about this ?

Chris Kawa

If you ask about QGraphicsView I'd suggest reading through docs. They are really comprehensive.
Also check "Qt examples":http://qt-project.org/doc/qt-4.8/examples-graphicsview.html

As for batman I'd try "this link":http://www.dccomics.com/ :)

ahura_24

ok ok tnx alot :) . i have another question : how can i draw PolyLine in graphicsscene like other graphics object ? i want that can select and move it and other option like other object in graphic ?

i know that must create one class and inherit form QGrItem but i dont know how can i calculate bounding rect and shape and .... :(

Chris Kawa

Another name for polyline is path, and there's already a class for it in Qt: "QGraphicsPathItem":http://qt-project.org/doc/qt-5.0/qtwidgets/qgraphicspathitem.html

ahura_24

tnx i read this tnx alot :) :) if i have question i ask you :) tnx