Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. Saving QGraphicsScene (vector graphics PLUS IMAGE) to SVG
Forum Updated to NodeBB v4.3 + New Features

Saving QGraphicsScene (vector graphics PLUS IMAGE) to SVG

Scheduled Pinned Locked Moved Unsolved General and Desktop
4 Posts 2 Posters 1.1k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • B Offline
    B Offline
    bliako
    wrote on last edited by
    #1

    Hello,

    I am creating a QGraphicsScene and adding several points (as tiny QGraphicsRectItem). I am also creating a path as QGraphicsPathItem. I am able to export this to SVG using the well documented method:

    QSvgGenerator generator;
    generator.setResolution((int )dpi);
    generator.setFileName(afilename);
    
    QPainter painter;
    painter.begin(&generator);
    painter.setRenderHint(QPainter::Antialiasing);
    // myGraphicsScene is a subclass of QGraphicsScene
    myGraphicsScene->render(&painter);
    painter.end();
    

    And that works fine. Output SVG is fine.

    Then I am reading an image from file and convert it to a QBrush which I use to fillPath(), that is to flood-fill my path with this image/brush.

    I can see the vector graphics and the filled-with-image path on my canvas just fine. I can also see same results when outputting as an image (PNG/JPG) using similar method as above.

    BUT, I can not see the image in my SVG output file. Everything else is OK, path, rects. Just fine. But there is no image. And as far as I could understand by reading the output SVG text file, there is no mention of any image in that file.

    Does anyone have any hints for solving this problem?

    Thanks,
    bliako

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      This might be outside of the static features of SVG tiny 1.2 specification implemented by the QtSvg module.

      See here

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      0
      • B Offline
        B Offline
        bliako
        wrote on last edited by bliako
        #3

        Thanks for your reply. I found this link via the link you provided: [https://www.w3.org/Graphics/SVG/feature/1.2/#SVG-static](link url) Which lists all the static features of SVG 1.2 as:

        Feature String:
            http://www.w3.org/Graphics/SVG/feature/1.2/#SVG-static
        User Agent Supports:
            All of the following features (described below)
        ...
        feature/1.2/#ConditionalProcessingAttribute"
                "http://www.w3.org/Graphics/SVG/feature/1.2/#Image"
        ... etc.
        
         For SVG viewers,
        "http://www.w3.org/Graphics/SVG/feature/1.2/#SVG-static"
        indicates that the viewer can process and render
        successfully all of the language features in the
        modules corresponding to the features
        listed above. 
        

        So, Image support is there as I understand it.

        And I can confirm that if I do

        QPixmap *myPixmap = new QPixmap();
        myPixmap.load(imgfilename);
        ...
        Qpainter painter;
        painter->drawPixmap(0, 0, *myPixmap);
        ...
        

        Then exported SVG file contains an <image element and I can view the image in gimp.

        However, if I add:

        ...
        QBrush *myBrush = new QBrush(*myPixmap);
        ...
        painter->fillPath(myGIPath->path(), *myBrush);
        

        I can see the pixmap on my application's QGraphicsScene fine, but when I export to SVG, image is now missing.

        Am I doing this last bit right?

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          Except that you don't need to allocate the brush on the heap. The line is fine.

          Did you already check the bug report system ?

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
          0

          • Login

          • Login or register to search.
          • First post
            Last post
          0
          • Categories
          • Recent
          • Tags
          • Popular
          • Users
          • Groups
          • Search
          • Get Qt Extensions
          • Unsolved