c++ - Find the center position of a QGraphicsScene? -

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I have tried to use the following code to add a line to my view: 

  line = new QGraphicsLineItem (200,55,200,55); Mscene.addItem (ruler);

But it seems that the coordination of QGraphicsLineItem starts at the left corner. I do not want to change the original in any way. I just want to regain the coordination of the position of the center of the QigraphicsScene / Qigraphixview. Which function do I use? 

  line = new QGraphicsLineItem (200,55,200,55); Mscene.addItem (ruler);

As a state for this creator of QGraphicsLineItem: -

creates a QGraphicsLineItem, (x1, y1) and ( X2, y2) as the default line.

This creates a QGraphicsLineItem with local coordinates (200, 55, 200, 55), so the line you are creating Is the beginning and closes the coordinates on the same point (200, 55).

Once you create a line object and add it to view, you can make a call to your position. To get the status of the visual center, you can use it and: - 

  // Assume that PSCEN QGraphicsScene line-> SetOps (PSCAN-> width () / 2, PSCN -> height () / 2);

QGraphicsView is just a window to see in a scene, so in this case, the item may be in the center of the view, but can not be seen in the middle .

You can place

on an item with a call in a visual center.

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