Center text on painter

Hi All,

How can I center text at a given x position on a painter?

I use a function to draw lines and above the line I want to set the value of the line (like 0, 2, 4, 6 etc) How can I center these values? I now use something like p.drawText(x,y,`bla') but there must be a way to find out how large 'bla' will be in pixels?

Thanks in advance
Rob

Use QFontMetrics to find the height, width, ascent and descent of the text you use.

Quote:

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Originally Posted by masoroso

I now use something like p.drawText(x,y,`bla') but there must be a way to find out how large 'bla' will be in pixels?

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Either use QPainter::boundingRect() or paint the text using different QPainter::drawText() method (the one which takes QRect as the first parameter).

thanks!

I now use

Code:

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QFontMetrics fm(painter.font());
...
tw = fm.width(sx);
painter.drawText(x+tw/2, y, sx);

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btw. I did not understand the boundingRect option... I still need to know the rect dimensions before I call `boundingrect'??

Anyway, it works this way so thank you both,
Rob

whoops sorry..

boundingrect is a better option in this case because QFontMetrics does not have a height() option (and I also need to align to the center of the height).

The code is now rewritten to

Code:

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QFontMetrics fm(painter.font());
..
xoffset = fm.boundingRect(sx).width()/2;
painter.drawText(x - xoffset, y, sx);

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Quote:

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Originally Posted by masoroso

I still need to know the rect dimensions before I call `boundingrect'??

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No, you don't have to:

Quote:

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If the text does not fit within the given rectangle using the specified flags, the function returns the required rectangle.

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