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Thread: Substitute of Qt::NotROP in QT4.5

  1. #1
    Join Date
    Jun 2009
    Qt products
    Qt3 Qt4

    Post Substitute of Qt::NotROP in QT4.5

    Hi Everybody,

    I am porting an application from QT3.3 to QT4.5. The Qt3.3 code use setRasterOp function to set the mode Qt::NotROP. Following is snippet of code.

    Qt Code:
    1. void setPainter(QPainter *p)
    2. {
    3. p->translate(-contentsX(), -contentsY());
    4. p->scale(d->Scale, d->Scale);
    5. p->translate(-d->ViewX1, -d->ViewY1);
    6. p->setPen(Qt::DotLine);
    8. p->setRasterOp(Qt::NotROP); // background should not be erased
    10. p->drawLine(..........);
    11. }
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    I wish to know what is substitution of Qt:NotROP in QT4. I have already tried [ p->setCompositionMode(QPainter::CompositionMode_Sour ceOut); ] which i found most close to NoTROP in Enum table. But this donot give same effect as Qt::NotROP. I am painting on viewport of Q3ScrollArea on mouse movement.

    I will be thankful for your help.

  2. #2
    Join Date
    Jan 2006
    Warsaw, Poland
    Thanked 5,012 Times in 4,791 Posts
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    Default Re: Substitute of Qt::NotROP in QT4.5

    There is no simple substitution. The concept of painting in Qt4 has changed and you shouldn't try to paint outside the paint event, if that's what you are doing.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

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