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Thread: Getting the bounding rectangle

  1. #1
    Join Date
    Apr 2008
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    Default Getting the bounding rectangle

    I have implemented the following code

    Qt Code:
    1. QRectF rect(0, 0, height(), Margin);
    2. painter->save();
    3. painter->translate(50,0);
    4. painter->rotate(90);
    5. painter->drawText(rect,Qt::AlignCenter | Qt::AlignTop,str);
    6. strBoundingRect = painter->boundingRect(rect,Qt::AlignCenter,str);
    7. painter->restore();
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    However, using the above code return in strBoundingRect the initial bounding rectangle of the QString str and not the one that corresponds to the rotated and translated painter.

    Can you give me an example on how can I obtain the bounding rectangle taking also into account both translation and rotation?

    Thanks in advance...
    Last edited by ioannis; 21st May 2009 at 14:49.

  2. #2
    Join Date
    Jan 2006
    Warsaw, Poland
    Thanked 5,014 Times in 4,792 Posts
    Qt products
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    Wiki edits

    Default Re: Getting the bounding rectangle

    Rotate and translate the received bounding rect.

    Qt Code:
    1. QTransform t;
    2. t.rotate(...);
    3. t.translate(...);
    4. QRect transformed = t.mapRect(r);
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  3. The following user says thank you to wysota for this useful post:

    ioannis (22nd May 2009)

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