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How to use SVG

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  • SavizS Saviz

    @mrjj

    I tried doing what you suggested. Unfortunately it didn't work.

    I first cleaned the project and then ran qmake but I still get the same errors.
    Maybe I am doing something else wrong? (Like not including something?)

    JoeCFDJ Offline
    JoeCFDJ Offline
    JoeCFD
    wrote on last edited by JoeCFD
    #18

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

    SavizS 1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #19

      Drop the C++ CONFIG, you do not need that currently.

      You should also consider updating to the latest Qt 6.1.

      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
      • JoeCFDJ Offline
        JoeCFDJ Offline
        JoeCFD
        wrote on last edited by JoeCFD
        #20

        @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 1 Reply Last reply
        0
        • 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
                                  2

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