How can I select the QGraphicView Item and change the properties

Question

cordsacOct. 18, 2017, 1:03 p.m.

How can I select the QGraphicView Item and change the properties

How can I select the QGraphicView items using mouse and change the properties(size,color).In this code I create Rectangles when the button clicks.But now I need to change properties of the rectangles.How can I select the each rectangle shapes using mouse and change the properties of the each one.

void Widget::on_btnCreateRect_clicked()
{

    QBrush blueBrush(Qt::green);
    QPen blackPen(Qt::black);
    blackPen.setWidth(2);

    rect = ui->graphicsView->scene()->addRect(-10,-10,250,100,blackPen);
    rect->setFlag(QGraphicsItem::ItemIsMovable, true);
}

http://doc.qt.io/qt-5/qtwidgets-graphicsview-diagramscene-example.html In this example it can select square shapes and change the color of each squares.I need to do same thing and change the size of each shape,but I have no idea to do it.how can I do it?

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Oct. 19, 2017, 3:34 a.m.
(edited)

It is very big question.
First I give You idea, from that You can start, but some example I can write to you on weekend only.

Therefore, first, try to make changing of color.
For example, You need to make your own class from QGraphicsItem, or QGraphicsRectItem.
Example in this article . In this article You will find example of moving items on QGraphicsScene without flag ItemIsMovable. You need just to change logic to changing of color instead of moving the item.

c

cordsac → Evgenii Legotckoi
#

Oct. 19, 2017, 5:49 a.m.

Ok I'll check it sir,If you can please do article(tutorial) about this,Its really useful.Thank you
if you can give me some sample code when you free.thanks again

Evgenii Legotckoi → cordsac
#

Oct. 22, 2017, 5:05 a.m.

I found my old project, where I made simple Vector Editor. I wrote article about this editor and you will find link to project.
You can research it. In this project You will see, why I said your question is very big.

Link to article

Evgenii Legotckoi → cordsac
#

Oct. 22, 2017, 7:40 a.m.
The answer was marked as a solution.

And It will be very cool, if have oportunities to share this article in some socials networks. Thanks.

c

cordsac → Evgenii Legotckoi
#

Oct. 22, 2017, 12:52 p.m.

Thank you very much sir,My next problem was how re - size the QGraphicViewItem (such as rectangle) using mouse,I think your project also have that function,thanks again :)

c

cordsac → Evgenii Legotckoi
#

Oct. 22, 2017, 3:27 p.m.
(edited)

You are correct sir, this is a big question,most part of your solution I can't understand.If you can please explain your project sir.If you can please explain your code with each classes or please make some video tutorial with basic example,thank you

https://evileg.com/post/291/

Evgenii Legotckoi → cordsac
#

Oct. 23, 2017, 3:49 a.m.

I can to explain project, but I haven`t time to make video tutorial.

Just ask a new questions on forum about moments, which you don't understand. And I will explain you it step by step.

c

cordsac → Evgenii Legotckoi
#

Oct. 23, 2017, 1:18 p.m.

I posted it here sir

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