How to keep rectangle name to its center ?

[tushu]

I have a QGraphicsScene that contains rectangle.
I know rectangles top left and bottom right x and y co-ordinates.
I want to place name of rectangle such that, half name will come to left half of rectangle and half will come to right half of rectangle.

LIke this :

I tried this way :

QFontMetrics fontMetrics(QApplication::font());
    int textWidth = fontMetrics.width(instanceTextString) / 2; // Half of the name width
    int textHeight = fontMetrics.height() ;

    int rectWidthMidPoint = (x2  - x1 ) / 2;
    int textStartXPoint = rectWidthMidPoint - textWidth;
    int textStartYPoint = y1 - textHeight;
    text->DrawText(textStartXPoint  ,textStartYPoint );

But name position is far to the left.
How to solve it ?

[JoeCFD]

@tushu

int textStartXPoint = x1 + rectWidthMidPoint - textWidth;

[tushu]

@JoeCFD Thanks.