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Update scene

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updatesceneqgraphicsview
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  • M mrjj
    24 Jan 2016, 19:13

    @mandruk1331
    But what u want to swap them?
    Is it not enough to just swap the colors?

    QPointF Pos1;
    Pos1=rectan[0]->pos();
    QPointF Pos2;
    Pos2=rectan[1]->pos();
    rectan[0]->setPos(pos2);
    rectan[1]->setPos(pos1);

    M Offline
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    mandruk1331
    wrote on 25 Jan 2016, 11:48 last edited by
    #9

    @mrjj No luck, it does not change the position

    Mandruk1331

    M 1 Reply Last reply 25 Jan 2016, 11:51
    0
    • M mandruk1331
      25 Jan 2016, 11:48

      @mrjj No luck, it does not change the position

      M Offline
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      mrjj
      Lifetime Qt Champion
      wrote on 25 Jan 2016, 11:51 last edited by
      #10

      @mandruk1331

      Ok.
      So what happened?
      if you do
      rectan[0]->setPos(0,0);

      Does it move then?

      M 1 Reply Last reply 25 Jan 2016, 12:04
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      • M mrjj
        25 Jan 2016, 11:51

        @mandruk1331

        Ok.
        So what happened?
        if you do
        rectan[0]->setPos(0,0);

        Does it move then?

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        mandruk1331
        wrote on 25 Jan 2016, 12:04 last edited by
        #11

        @mrjj No, at the moment I'm trying to make smth like an Update func

        void MainWindow::Shot(){

        QGraphicsRectItem *Pos1;
        

        Pos1=rectan[0];
        QGraphicsRectItem *Pos2;
        Pos2=rectan[1];
        scene->removeItem(rectan.at(0));
        scene->removeItem(rectan.at(1));

        rectan.at(0) = Pos2;
        rectan.at(1) = Pos1;
        scene->addItem(rectan.at(0));
        scene->addItem(rectan.at(1));
        }

        Mandruk1331

        1 Reply Last reply
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        • M Offline
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          mrjj
          Lifetime Qt Champion
          wrote on 25 Jan 2016, 12:09 last edited by
          #12

          Hi
          at returns const.
          This looks strange to me
          rectan.at(0) = Pos2;
          maybe
          rectan[0] = Pos2

          Also this will just swap the position in your list.
          It will NOT change on screen.

          You need to use pos() and SetPos
          Not just swap in you array. You swap pointers.
          You should swap QPointF using pos and setPos;

          M 1 Reply Last reply 25 Jan 2016, 12:17
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          • M mrjj
            25 Jan 2016, 12:09

            Hi
            at returns const.
            This looks strange to me
            rectan.at(0) = Pos2;
            maybe
            rectan[0] = Pos2

            Also this will just swap the position in your list.
            It will NOT change on screen.

            You need to use pos() and SetPos
            Not just swap in you array. You swap pointers.
            You should swap QPointF using pos and setPos;

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            mandruk1331
            wrote on 25 Jan 2016, 12:17 last edited by
            #13

            @mrjj I thought it will repaint the rects, because first I delete them and then I want to repaint them with new options

            Mandruk1331

            M 1 Reply Last reply 25 Jan 2016, 12:19
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            • M mandruk1331
              25 Jan 2016, 12:17

              @mrjj I thought it will repaint the rects, because first I delete them and then I want to repaint them with new options

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              mrjj
              Lifetime Qt Champion
              wrote on 25 Jan 2016, 12:19 last edited by
              #14

              @mandruk1331

              Yes I guess it will repaint them on scene.
              But it matters not for scene if you swap your own array.
              The items still have same location as before as you do not setPos
              (from code shown)

              M 1 Reply Last reply 25 Jan 2016, 12:25
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              • M mrjj
                25 Jan 2016, 12:19

                @mandruk1331

                Yes I guess it will repaint them on scene.
                But it matters not for scene if you swap your own array.
                The items still have same location as before as you do not setPos
                (from code shown)

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                mandruk1331
                wrote on 25 Jan 2016, 12:25 last edited by
                #15

                @mrjj and another one, I have a loop inside of a loop and when the second one finishes its iteration it won't singleshot on another iteration of the first loop

                for (int =0;i<10;i++){
                //and when i is 1 the second loop won't singleshot again
                for(int j=0;j<9;j++){
                SingleShot
                }
                }

                Mandruk1331

                1 Reply Last reply
                0
                • M Offline
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                  mrjj
                  Lifetime Qt Champion
                  wrote on 25 Jan 2016, 12:28 last edited by
                  #16

                  well
                  Normally it works as many times as u set it up but hard to guess at with
                  only "SingleShot".

                  M 1 Reply Last reply 25 Jan 2016, 12:50
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                  • M mrjj
                    25 Jan 2016, 12:28

                    well
                    Normally it works as many times as u set it up but hard to guess at with
                    only "SingleShot".

                    M Offline
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                    mandruk1331
                    wrote on 25 Jan 2016, 12:50 last edited by
                    #17

                    @mrjj Why this code does not add the item, I don't understand, I remove it and then I want to re-add it with new options
                    void MainWindow::Shot(){
                    QGraphicsRectItem *t = new QGraphicsRectItem(rectan.at(0));

                    scene->removeItem(rectan.at(1));

                    rectan[1] = t;
                    scene->addItem(rectan[1]);
                    }

                    Mandruk1331

                    1 Reply Last reply
                    0
                    • M Offline
                      M Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on 25 Jan 2016, 12:55 last edited by
                      #18

                      @mandruk1331 said:

                      Why do yo u give rectan.at(0) to constructor ?
                      new QGraphicsRectItem(rectan.at(0));

                      Try
                      scene->addItem( new QGraphicsRectItem );
                      and tell if that not add a new item?

                      M 1 Reply Last reply 25 Jan 2016, 17:51
                      0
                      • M mrjj
                        25 Jan 2016, 12:55

                        @mandruk1331 said:

                        Why do yo u give rectan.at(0) to constructor ?
                        new QGraphicsRectItem(rectan.at(0));

                        Try
                        scene->addItem( new QGraphicsRectItem );
                        and tell if that not add a new item?

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                        mandruk1331
                        wrote on 25 Jan 2016, 17:51 last edited by mandruk1331
                        #19

                        @mrjj Ok, I managed to swap positions of the rectangles, but they swap not always, at first execution they swap on the other they don't, what could be the problem??

                        void MainWindow::Shot(){
                        QPointF Pos1;
                        QPointF Pos2;
                        Pos1 = rectan.at(5)->pos();
                        Pos2 = rectan.at(6)->pos();

                        rectan.at(6)->setBrush(Qt::blue);
                        rectan.at(5)->setBrush(Qt::green);
                        // rectan.at(5)->setBrush(Qt::blue);
                        rectan.at(6)->setPos(Pos1.rx()-30,Pos1.ry());
                        rectan.at(5)->setPos(Pos2.rx()+30,Pos2.ry());

                        }
                        Solved it)

                        Mandruk1331

                        1 Reply Last reply
                        0
                        • M Offline
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                          mrjj
                          Lifetime Qt Champion
                          wrote on 25 Jan 2016, 18:18 last edited by
                          #20

                          hi
                          put qDebug() << "in shot:"
                          in the
                          MainWindow::Shot()
                          to make sure its actually called mutiple times.

                          M 1 Reply Last reply 25 Jan 2016, 19:19
                          0
                          • M mrjj
                            25 Jan 2016, 18:18

                            hi
                            put qDebug() << "in shot:"
                            in the
                            MainWindow::Shot()
                            to make sure its actually called mutiple times.

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                            mandruk1331
                            wrote on 25 Jan 2016, 19:19 last edited by
                            #21

                            @mrjj Pos2 = rectan.at(6)->scenePos(); - this one return (0,0), why? I tried pos() too

                            Mandruk1331

                            1 Reply Last reply
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                            • M Offline
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                              mrjj
                              Lifetime Qt Champion
                              wrote on 25 Jan 2016, 19:23 last edited by
                              #22

                              if pos() returns 0,0 , it must mean the items is actually at 0,0.

                              M 1 Reply Last reply 25 Jan 2016, 19:40
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                              • M mrjj
                                25 Jan 2016, 19:23

                                if pos() returns 0,0 , it must mean the items is actually at 0,0.

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                                mandruk1331
                                wrote on 25 Jan 2016, 19:40 last edited by
                                #23

                                @mrjj and the other ones return 0,0. The object are unique they are all parents and have no child, I want to get the positions of each object so I could move them

                                Mandruk1331

                                M 1 Reply Last reply 25 Jan 2016, 19:43
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                                • M mandruk1331
                                  25 Jan 2016, 19:40

                                  @mrjj and the other ones return 0,0. The object are unique they are all parents and have no child, I want to get the positions of each object so I could move them

                                  M Offline
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                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on 25 Jan 2016, 19:43 last edited by
                                  #24

                                  @mandruk1331
                                  Something is not right.
                                  Unless they are all really drawn at 0,0 then pos() should return the
                                  actual position.
                                  Did you new a QGraphicsRectItem and inserted directly in the list?

                                  M 1 Reply Last reply 25 Jan 2016, 19:45
                                  0
                                  • M mrjj
                                    25 Jan 2016, 19:43

                                    @mandruk1331
                                    Something is not right.
                                    Unless they are all really drawn at 0,0 then pos() should return the
                                    actual position.
                                    Did you new a QGraphicsRectItem and inserted directly in the list?

                                    M Offline
                                    M Offline
                                    mandruk1331
                                    wrote on 25 Jan 2016, 19:45 last edited by
                                    #25

                                    @mrjj yes, and in the constructor I have set theirs poistions

                                    Mandruk1331

                                    M 1 Reply Last reply 25 Jan 2016, 19:47
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                                    • M mandruk1331
                                      25 Jan 2016, 19:45

                                      @mrjj yes, and in the constructor I have set theirs poistions

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                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on 25 Jan 2016, 19:47 last edited by
                                      #26

                                      Ok, then they should still have the pos, unless you swapped with a
                                      item having 0,0.

                                      1 Reply Last reply
                                      0
                                      • M Offline
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                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on 25 Jan 2016, 19:51 last edited by
                                        #27

                                        Can I ask how any values (rects) you try to visualize?

                                        M 1 Reply Last reply 25 Jan 2016, 19:58
                                        0
                                        • M mrjj
                                          25 Jan 2016, 19:51

                                          Can I ask how any values (rects) you try to visualize?

                                          M Offline
                                          M Offline
                                          mandruk1331
                                          wrote on 25 Jan 2016, 19:58 last edited by
                                          #28

                                          @mrjj 10

                                          Mandruk1331

                                          M 1 Reply Last reply 25 Jan 2016, 20:04
                                          0

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