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Thread: larger(not to scale) a exist QPixmap and paint more thing on the blank space

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    Default larger(not to scale) a exist QPixmap and paint more thing on the blank space

    QPixmap.transformed(QTransform::fromTranslate(x,y) ) did not have a good result.
    Is there a way?
    Jerry

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    Default Re: larger(not to scale) a exist QPixmap and paint more thing on the blank space

    Have you tried QPixmap::scaled(), QPixmap::scaledToWidth() and QPixmap::scaledToHeight() ?

    Where do you want to put the larger QPixmap? On a QLabel? Then just have a look at QLabel::scaledContents()

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    Default Re: larger(not to scale) a exist QPixmap and paint more thing on the blank space

    yes,i tried the scaled(), but it did not work as I wanted. It just scaled the whole picture. what i wanted is just larger the paint area and leave the origin picture unchanged.Then I will draw something on the blank area.


    Added after 32 minutes:


    Is it a complicated problem?
    Last edited by calmspeaker; 8th July 2011 at 08:19.
    Jerry

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    Default Re: larger(not to scale) a exist QPixmap and paint more thing on the blank space

    Well if you just want to adjust the size of the paint area it is not very complicated. Lets say that you are painting in a QWidget then in paintEvent() you can do something like this.

    Qt Code:
    1. QPixmap example;
    2. example.load("Picturepath");
    3. QSize pixmapSize = example.size();
    4. this->resize(pixmapSize);
    To copy to clipboard, switch view to plain text mode 

    Edit: And of course use QPainter::drawPixmap after that
    Last edited by meazza; 8th July 2011 at 08:33.

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    Default Re: larger(not to scale) a exist QPixmap and paint more thing on the blank space

    Use QPainter inside paint event and draw pixmap through
    void QPainter::drawPixmap ( int x, int y, int width, int height, const QPixmap & pixmap )
    I hope it will help you...

  6. The following user says thank you to MrShahi for this useful post:

    calmspeaker (8th July 2011)

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    Default Re: larger(not to scale) a exist QPixmap and paint more thing on the blank space

    You did help me! Thank you.
    Qt Code:
    1. QPixmap pixicon = item->icon(column).pixmap(QSize(32,32));//the origin icon
    2. QPixmap pix(32,32);//store the modified icon
    3. pix.fill(Qt::transparent);
    4. QPainter paint(&pix);
    5. paint.drawPixmap(16,16,16,16,pixicon);//bottom right paint pixicon
    6.  
    7. paint.drawLine(QPointF(12,0),QPointF(12,24));//modify the pixmap
    8. paint.drawLine(QPointF(0,12),QPointF(24,12));
    To copy to clipboard, switch view to plain text mode 
    Jerry

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