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How to use SVG

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  • JoeCFDJ JoeCFD

    @Saviz CONFIG += c++17 you also need 17 for Qt 6.
    Show this line of your Makefile:
    LIBS = $(SUBLIBS)
    it should have -lQt5Svg

    SavizS Offline
    SavizS Offline
    Saviz
    wrote on last edited by Saviz
    #21

    @JoeCFD

    I don't see this line in my qmake file. Maybe that is the reason it doesn't work. Should I add it?

    1 Reply Last reply
    0
    • JoeCFDJ JoeCFD

      @Saviz Another possibility is svg is not installed. Run MaintenaceTool to add it. I just installed Qt 6.1.2 in which svg is included. If you can find it in the Qt lib dir, check the path settings for Qt.

      SavizS Offline
      SavizS Offline
      Saviz
      wrote on last edited by
      #22

      @JoeCFD said in How to use SVG:

      MaintenaceTool

      If I want to only install the SVG components, then what component do I have to select in the MaintenaceTool to install?

      mrjjM 1 Reply Last reply
      0
      • SavizS Saviz

        @JoeCFD said in How to use SVG:

        MaintenaceTool

        If I want to only install the SVG components, then what component do I have to select in the MaintenaceTool to install?

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #23

        @Saviz

        Hi

        It should be included in any of the installer options. Its not a standalone option.

        I don't have Qt6 to test with.

        So the project I linked cannot run under Qt6 ?

        complains about svg ?

        Try install the Qt 6.1.2 as @JoeCFD suggests

        SavizS 1 Reply Last reply
        0
        • mrjjM mrjj

          @Saviz

          Hi

          It should be included in any of the installer options. Its not a standalone option.

          I don't have Qt6 to test with.

          So the project I linked cannot run under Qt6 ?

          complains about svg ?

          Try install the Qt 6.1.2 as @JoeCFD suggests

          SavizS Offline
          SavizS Offline
          Saviz
          wrote on last edited by Saviz
          #24

          @mrjj

          I will give it a try. But my speed is not the best. It may take a while to download the new version. But I will report back how it went. Thank you all for your help

          mrjjM 1 Reply Last reply
          0
          • SavizS Saviz

            @mrjj

            I will give it a try. But my speed is not the best. It may take a while to download the new version. But I will report back how it went. Thank you all for your help

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #25

            @Saviz

            Hi
            Else a sure bet is installing Qt5.15.
            While v6 does offer new things
            https://wiki.qt.io/New_Features_in_Qt_6.0
            Its mostly if you are using QML and it still has lots of features missing planned
            for some later releases.

            SavizS 1 Reply Last reply
            1
            • mrjjM mrjj

              @Saviz

              Hi
              Else a sure bet is installing Qt5.15.
              While v6 does offer new things
              https://wiki.qt.io/New_Features_in_Qt_6.0
              Its mostly if you are using QML and it still has lots of features missing planned
              for some later releases.

              SavizS Offline
              SavizS Offline
              Saviz
              wrote on last edited by
              #26

              @mrjj

              Okay, I will try it. By the way I have one last question. Why isn't there a widget for SVG in QT Designer by default?

              mrjjM 1 Reply Last reply
              0
              • SavizS Saviz

                @mrjj

                Okay, I will try it. By the way I have one last question. Why isn't there a widget for SVG in QT Designer by default?

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #27

                @Saviz

                • Why isn't there a widget for SVG in QT Designer by default?

                Too much work I would guess. To allow a Widget to be used in design time, a plugin must be made and maintained across many Designers.
                And QSvgWidget doesn't have any properties to set at Design time. (besides the svg file) so I gues sit was
                not worth the effort.

                You can use the Producer Promote feature to allow a Qwidget as a place holder in Designer and then app is run its
                the SVG one.

                SavizS 1 Reply Last reply
                2
                • mrjjM mrjj

                  @Saviz

                  • Why isn't there a widget for SVG in QT Designer by default?

                  Too much work I would guess. To allow a Widget to be used in design time, a plugin must be made and maintained across many Designers.
                  And QSvgWidget doesn't have any properties to set at Design time. (besides the svg file) so I gues sit was
                  not worth the effort.

                  You can use the Producer Promote feature to allow a Qwidget as a place holder in Designer and then app is run its
                  the SVG one.

                  SavizS Offline
                  SavizS Offline
                  Saviz
                  wrote on last edited by
                  #28

                  @mrjj

                  Very interesting. Is there a documentation that I can use for the Producer Promote feature so I can learn it?

                  mrjjM 1 Reply Last reply
                  0
                  • SavizS Saviz

                    @mrjj

                    Very interesting. Is there a documentation that I can use for the Producer Promote feature so I can learn it?

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by mrjj
                    #29

                    @Saviz

                    Hi
                    Its very handy.

                    In your use case you place a QWidget on the form, right-click and choose to promote.
                    Then tell it QSvgWidget for class name and it will guess on QSvgWidget.h
                    Then press Add (+), then then promote.

                    https://doc.qt.io/qt-5/designer-using-custom-widgets.html

                    https://stackoverflow.com/questions/33588289/what-is-promote-to-feature-in-qt-creator-and-how-does-it-work

                    Do note:
                    Accessing it via Ui-> is possible and you can call the real functions from code, just like any other widget.

                    SavizS 1 Reply Last reply
                    1
                    • mrjjM mrjj

                      @Saviz

                      Hi
                      Its very handy.

                      In your use case you place a QWidget on the form, right-click and choose to promote.
                      Then tell it QSvgWidget for class name and it will guess on QSvgWidget.h
                      Then press Add (+), then then promote.

                      https://doc.qt.io/qt-5/designer-using-custom-widgets.html

                      https://stackoverflow.com/questions/33588289/what-is-promote-to-feature-in-qt-creator-and-how-does-it-work

                      Do note:
                      Accessing it via Ui-> is possible and you can call the real functions from code, just like any other widget.

                      SavizS Offline
                      SavizS Offline
                      Saviz
                      wrote on last edited by Saviz
                      #30

                      @mrjj

                      So, if I want to create a custom widget for SVG, how can I do that? Is there an example that I can follow for promoting a widget to SVG?

                      (I ask this because I really want to use SVG as default and I need a solution.)
                      (I am also a beginner so I have no idea where to start :) )

                      mrjjM 1 Reply Last reply
                      0
                      • SavizS Saviz

                        @mrjj

                        So, if I want to create a custom widget for SVG, how can I do that? Is there an example that I can follow for promoting a widget to SVG?

                        (I ask this because I really want to use SVG as default and I need a solution.)
                        (I am also a beginner so I have no idea where to start :) )

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #31

                        @Saviz
                        Hi
                        What you mean with custom widget for SVG ?

                        You mean your own classed based on QSvgWidget ?

                        Or to simply use QSvgWidget ?

                        1 Reply Last reply
                        0
                        • L Offline
                          L Offline
                          Labidi Ahmed
                          wrote on last edited by
                          #32

                          So i am using Qt 6.2.2 & ran into the same problem the solution was :

                          in the .pro file its QT+= svg svgwidgets
                          now you can

                          #include <QSvgWidgets>
                          

                          found it in the included svgviewer example in QT qtsvg-svgviewer-example

                          hope i helped

                          1 Reply Last reply
                          2
                          • SMEasyS Offline
                            SMEasyS Offline
                            SMEasy
                            wrote on last edited by
                            #33

                            As explained here, QSvgWidget has been moved to a new module called QtSvgWidgets. According to the documentation:

                            Header: #include <QSvgWidget>
                            CMake: find_package(Qt6 REQUIRED COMPONENTS SvgWidgets) target_link_libraries(mytarget PRIVATE Qt6::SvgWidgets)
                            qmake: QT += svgwidgets
                            Inherits: QWidget

                            So in Qt6 the solution is following:

                            QT += svgwidgets
                            
                            1 Reply Last reply
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