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. QCustomPlot clear Data
Forum Updated to NodeBB v4.3 + New Features

QCustomPlot clear Data

Scheduled Pinned Locked Moved Solved General and Desktop
18 Posts 12 Posters 16.6k Views 4 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.
  • H Offline
    H Offline
    HafsaElif
    wrote on last edited by
    #1

    hi;

    I have qcustomplot grapich. It have lots of line ploting before. I want to clear this ploting data.

    There is 2 code which is find. but these codes delete graph (0-1-2-3);

    cleargraph();
    clearitem();

    I want to clear graph data not graph completely. How can I figure out ?

    Thank you..

    1 Reply Last reply
    0
    • RatzzR Offline
      RatzzR Offline
      Ratzz
      wrote on last edited by
      #2

      @HafsaElif

      Is it the same Question ?

      --Alles ist gut.

      1 Reply Last reply
      4
      • H Offline
        H Offline
        HafsaElif
        wrote on last edited by
        #3

        yes ı wrote.

        1 Reply Last reply
        0
        • RatzzR Offline
          RatzzR Offline
          Ratzz
          wrote on last edited by
          #4

          Is it solved?

          --Alles ist gut.

          1 Reply Last reply
          0
          • H Offline
            H Offline
            HafsaElif
            wrote on last edited by
            #5

            no. all about deleting not cleaning

            kshegunovK mrjjM 2 Replies Last reply
            0
            • H HafsaElif

              no. all about deleting not cleaning

              kshegunovK Offline
              kshegunovK Offline
              kshegunov
              Moderators
              wrote on last edited by
              #6

              I think Ian explained rather clearly what you can or can not do. I don't see how we could add to that.

              Read and abide by the Qt Code of Conduct

              H 1 Reply Last reply
              3
              • H HafsaElif

                no. all about deleting not cleaning

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #7

                @HafsaElif
                There is
                graph->data()->clear();
                Since the 2.0 beta version.

                Alternatively, you can simply give it an empty data list.
                Then its "Clear".

                1 Reply Last reply
                4
                • H Offline
                  H Offline
                  HafsaElif
                  wrote on last edited by
                  #8

                  I wrote this code and problem solved. Thank you mrjj !!!

                  ui->qcustom->graph(0)->data()->clear();
                  ui->qcustom->graph(1)->data()->clear();
                  ui->qcustom->graph(2)->data()->clear();
                  ui->qcustom->replot();
                  

                  0_1486038990528_Screenshot from 2017-02-01 12:00:06.png 0_1486038992133_Screenshot from 2017-02-02 15:35:37.png

                  1 Reply Last reply
                  1
                  • kshegunovK kshegunov

                    I think Ian explained rather clearly what you can or can not do. I don't see how we could add to that.

                    H Offline
                    H Offline
                    HafsaElif
                    wrote on last edited by
                    #9

                    @kshegunov I dont want to set empty data . I was searching for fallowing code which is shared by mrjj.

                    1 Reply Last reply
                    0
                    • I Offline
                      I Offline
                      indu
                      wrote on last edited by
                      #10

                      Hi,

                      I'm facing some issue with ui->qcustom->graph(0)->data()->clear();. It is not working for me.
                      Data container is not getting cleared, even if i call clear() and then replot().
                      Pls help.
                      Thank you.

                      1 Reply Last reply
                      0
                      • O Offline
                        O Offline
                        oaeide
                        wrote on last edited by
                        #11

                        I have the same problem as indu2. Calling clear() and replot(), nothing happens

                        1 Reply Last reply
                        0
                        • M Offline
                          M Offline
                          Marcel92
                          wrote on last edited by mrjj
                          #12

                          Try ui->yourPlot->clearPlottables();

                          1 Reply Last reply
                          2
                          • D Offline
                            D Offline
                            david_808
                            wrote on last edited by
                            #13

                            clearPlottables() does not work because it deletes the object entirely.

                            mrjjM 1 Reply Last reply
                            0
                            • D david_808

                              clearPlottables() does not work because it deletes the object entirely.

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #14

                              @david_808

                              Hi
                              Maybe ask the author of customplot about how to do it correctly then?

                              1 Reply Last reply
                              1
                              • S Offline
                                S Offline
                                Scarab
                                wrote on last edited by
                                #15

                                Try:

                                for( int g=0; g<pq_plot->graphCount(); g++ )
                                {
                                    pq_plot->graph(g)->data().data().clear();
                                }
                                pq_plot->replot();
                                

                                don't know why to use ->data().data() but it works for me.

                                1 Reply Last reply
                                1
                                • Joel BodenmannJ Offline
                                  Joel BodenmannJ Offline
                                  Joel Bodenmann
                                  wrote on last edited by
                                  #16

                                  @Scarab said in QCustomPlot clear Data:

                                  don't know why to use ->data().data() but it works for me.

                                  The type returned by QCPGraph::data() is a shared pointer to the data container. Both the shared pointer as well as the object the shared pointer is pointing to have a clear() function:

                                  • If you do pq_plot->graph(g)->data().clear() you are calling QSharedPointer::clear().
                                  • If you do pq_plot->graph(g)->data()->clear() you're calling QCPGraphDataContainer::clear() - which is what you actually want.

                                  Calling pq_plot->graph(g)->data().data().clear() (as per your example) effectively calls QCPGraphDataContainer::clear() because QSharedPointer::data() returns the raw pointer managed by the shared pointer.
                                  Therefore, pq_plot->graph(g)->data().data().clear() and pq_plot->graph(g)->data()->clear() are equivalent.

                                  I hope this helps to prevent confusion for people that come across this in the future.

                                  Industrial process automation software: https://simulton.com
                                  Embedded Graphics & GUI library: https://ugfx.io

                                  JamshidJ Q 2 Replies Last reply
                                  6
                                  • Joel BodenmannJ Joel Bodenmann

                                    @Scarab said in QCustomPlot clear Data:

                                    don't know why to use ->data().data() but it works for me.

                                    The type returned by QCPGraph::data() is a shared pointer to the data container. Both the shared pointer as well as the object the shared pointer is pointing to have a clear() function:

                                    • If you do pq_plot->graph(g)->data().clear() you are calling QSharedPointer::clear().
                                    • If you do pq_plot->graph(g)->data()->clear() you're calling QCPGraphDataContainer::clear() - which is what you actually want.

                                    Calling pq_plot->graph(g)->data().data().clear() (as per your example) effectively calls QCPGraphDataContainer::clear() because QSharedPointer::data() returns the raw pointer managed by the shared pointer.
                                    Therefore, pq_plot->graph(g)->data().data().clear() and pq_plot->graph(g)->data()->clear() are equivalent.

                                    I hope this helps to prevent confusion for people that come across this in the future.

                                    JamshidJ Offline
                                    JamshidJ Offline
                                    Jamshid
                                    wrote on last edited by
                                    #17

                                    @Joel-Bodenmann It was so helpful for me, thanks.

                                    1 Reply Last reply
                                    0
                                    • Joel BodenmannJ Joel Bodenmann

                                      @Scarab said in QCustomPlot clear Data:

                                      don't know why to use ->data().data() but it works for me.

                                      The type returned by QCPGraph::data() is a shared pointer to the data container. Both the shared pointer as well as the object the shared pointer is pointing to have a clear() function:

                                      • If you do pq_plot->graph(g)->data().clear() you are calling QSharedPointer::clear().
                                      • If you do pq_plot->graph(g)->data()->clear() you're calling QCPGraphDataContainer::clear() - which is what you actually want.

                                      Calling pq_plot->graph(g)->data().data().clear() (as per your example) effectively calls QCPGraphDataContainer::clear() because QSharedPointer::data() returns the raw pointer managed by the shared pointer.
                                      Therefore, pq_plot->graph(g)->data().data().clear() and pq_plot->graph(g)->data()->clear() are equivalent.

                                      I hope this helps to prevent confusion for people that come across this in the future.

                                      Q Offline
                                      Q Offline
                                      QtTester
                                      wrote on last edited by
                                      #18

                                      @Joel-Bodenmann said in QCustomPlot clear Data:

                                      iner::clear()
                                      I have tested for one hour, the memory grow from 8192k to 9600k,when i call clear(),the memory is still 9600k, seems not release.

                                      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