[Qt-interest] Inverting a QPainterPath

[Josiah Bryan]

Josiah Bryan wrote:
> David Boddie wrote:
>> Josiah Bryan wrote:
>>
>>> In reading the QPainterPath documentation at
>>> (http://doc.trolltech.com/4.5/qpainterpath.html), I dont see a way to
>>> "turn inside out" or "invert" the QPainter path. For example, in GIMP,
>>> you can create a selection (or path from text) then "invert" it so
>>> everything but the original path is selected. Is that dooable with a
>>> QPainterPath?
>> Create another painter path, add a rectangle to it, and subtract the first
>> path from it. Then draw that.
>>
>>   http://doc.trolltech.com/4.5/qpainterpath.html#subtracted
> 
> How in the world did I miss ::subtracted ?? Crikey! That's exactly what 
> I was looking for. Sorry everyone!
> 

Worked perfectly!

Sample code:

QPainterPath clipPath;
clipPath.addRect(QRectF(0,0,contentsRect().width(),contentsRect().height()));

QTextPath textPath;
textPath.addText(...);

QPainterPath textClip = clipPath.subtracted(textPath);
painter->setClipPath(textClip);

Beautiful! Thanks Jason and David.

Cheers!
-josiah