How can I resize QgraphicItem using mouse

Question

cordsac28. November 2017 13:23

How can I resize QgraphicItem using mouse

qt, QGraphicItem, resize, Rectangle, c++

I asked question under this topic previously too,But this is slightly difference. I 'm following this tutorial these days,In that tutorial you drawn rectangle using mouse.So I tried to draw a rectangle when a button click.here is my sample code.

mainwindow.h

 private:
 QGraphicsRectItem *rect;

mainwindow.cpp

void MainWindow::on_btnCreate_clicked()
{
    //VERectangle *rectA = new VERectangle();
   // rect->setRect(20,20,100,100);*/
    rect = workplaceScene->addRect(20,20,100,100);
}

when I click the button, rectangle is generating properly,But it cannot resize. Sir,could you please explain me,how can I enable resize functionality to this rectangle too? and when I select this rectangle rectangleSetting.Ui isn't enable too.How can I solve this problems.

Thank you!!!

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29. November 2017 16:46

Hello...

You just added common Rectangle (QGraphicsRectItem) via addRect method. You need add Custom Rectangle via addItem method.
Because in common way rectangle hasn`t methods for resizing.

c

cordsac → Evgenii Legotckoi
#

30. November 2017 14:56

Thank you very much sir,I did so and rectangle is crated and which can now able to resize.

void Widget::on_btnAdd_clicked()
{
    VERectangle *io = new VERectangle();
    io->setRect(10,10,100,200);
    workplaceScene->addItem(io);
}

But when I click the rectangle rectangleSettings is not visible.

void MainWindow::selectNewItem(QGraphicsItem *item)
{
    switch (item->type()) {
    case QGraphicsRectItem::Type: {
        VERectangle *rect = qgraphicsitem_cast<VERectangle *>(item);
        ui->rectangleSettings->newRectangle(rect);
        break;
    }
    default:
        break;
    }
}

why it happening so and,how can I solve this...

Evgenii Legotckoi → cordsac
#

3. Dezember 2017 16:22

In my example (Vector Editor) I used special method, which changes Configuration Widgets for Items on the Graphics Scene. When You select some items, you should invoke signal, by this signal you need to evaluate method for changing Configuration widget.

Please see this method in my example.

void MainWindow::checkSelection()
{
    checkActionStates();
    switch (workplaceScene->selectedItems().length()) {
    case 0:
        ui->rectangleSettings->deselect();
        ui->polylineSettings->deselect();
        checkActionStates();
        ui->toolsWidget->setEnabled(true);
        break;
    case 1:
        switch (workplaceScene->selectedItems().at(0)->type()) {
        case QGraphicsRectItem::Type:{
            ui->rectangleSettings->setVisible(true);
            ui->polylineSettings->deselect();
            ui->polylineSettings->setVisible(false);
            break;
        }
        default: {
            ui->rectangleSettings->deselect();
            ui->rectangleSettings->setVisible(false);
            ui->polylineSettings->setVisible(true);
            break;
        }
        }
        checkActionStates();
        ui->toolsWidget->setEnabled(true);
        break;
    default:
        ui->rectangleSettings->deselect();
        ui->polylineSettings->deselect();
        ui->toolsWidget->setEnabled(false);
        break;
    }
}

c

cordsac → Evgenii Legotckoi
#

4. Dezember 2017 11:14

rectangleSettings .UI not visible only when the rectangles create this way.But rectangleSettings .ui visible for way of your reactangle creation.In my project I did both ways to create rectangles.But rectangleSettings .ui not visible when I create rectangles like this way..

void Widget::on_btnAdd_clicked()
{
    VERectangle *io = new VERectangle();
    io->setRect(10,10,100,200);
    workplaceScene->addItem(io);
}

Evgenii Legotckoi → cordsac
#

4. Dezember 2017 16:06

I forgot about another method.

void MainWindow::checkActionStates()
{
    ui->workplaceView->setDragMode(QGraphicsView::NoDrag);
    ui->rectangleSettings->setVisible(false);
    ui->polylineSettings->setVisible(false);
    switch (workplaceScene->currentAction()){
    case VEWorkplace::LineType:
        ui->polylineSettings->setVisible(true);
        break;
    case VEWorkplace::RectangleType:
        ui->rectangleSettings->setVisible(true);
        break;
    case VEWorkplace::SelectionType:
        break;
    default:
        ui->workplaceView->setDragMode(QGraphicsView::ScrollHandDrag);
        break;
    }
}

I call this method, when I change state of graphics scene (in this case scene will be current action, create new item, or make selection). This method also changes visibility of settings widgets.

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