<![CDATA[Drawing circles using QPainter]]>Hi,
1->I need to draw circles based on user value in a table(Qtableview).
2->draw/connect two circle using line (CD)
3->shows direction in circle like arc kind (--->)
4->i need to display this circle in my tab2 (Qtabwidget)
How to do this ?

like simply i can do like this:

{
QPainter myellip(this);
QPen epen;
int x = 10;
epen.setWidth(3);
epen.setColor(Qt::yellow);
epen.setBrush(Qt::SolidPattern);
// myellip.setBrush(Qt::SolidPattern);
myellip.setPen(epen);
myellip.drawEllipse(QRect(150, 300, 100, 100));
}

How can i do these all ? How to approach ?

]]>https://forum.qt.io/topic/127061/drawing-circles-using-qpainterRSS for NodeThu, 30 Jul 2026 11:50:35 GMTThu, 27 May 2021 19:15:38 GMT60<![CDATA[Reply to Drawing circles using QPainter on Mon, 31 May 2021 09:08:22 GMT]]>@n-2204

Hi
If you data is from a View, its actually from its model.

but was it a question or ?

QPainter has all the functions you need to do it.

except maybe for the small arrow inside the circle

]]>https://forum.qt.io/post/662559https://forum.qt.io/post/662559Mon, 31 May 2021 09:08:22 GMT<![CDATA[Reply to Drawing circles using QPainter on Mon, 31 May 2021 08:32:55 GMT]]>@mrjj
ok Thankyou..
using Qpixmap & Qpainter is a good approach to draw the circles as i shared image above and i need to draw arc, lines & input for circle is from Qtableview

]]>https://forum.qt.io/post/662538https://forum.qt.io/post/662538Mon, 31 May 2021 08:32:55 GMT<![CDATA[Reply to Drawing circles using QPainter on Sat, 29 May 2021 08:36:25 GMT]]>Hi
well you can paint on a pixmap and show in a QLabel

 QPixmap pix(200, 200);
  pix.fill(Qt::blue);
  QPainter painter (&pix);
  painter.setRenderHint(QPainter::Antialiasing, true);
  ..... draw ...
  ui->label->setPixmap(pix);
]]>https://forum.qt.io/post/662245https://forum.qt.io/post/662245Sat, 29 May 2021 08:36:25 GMT<![CDATA[Reply to Drawing circles using QPainter on Fri, 28 May 2021 19:00:42 GMT]]>No, you cannot paint on another widget.

]]>https://forum.qt.io/post/662201https://forum.qt.io/post/662201Fri, 28 May 2021 19:00:42 GMT<![CDATA[Reply to Drawing circles using QPainter on Fri, 28 May 2021 13:16:31 GMT]]>Oh,,actually i haven't created class for tab2 widget
QPainter myellip(this);
can't i do like this-> QPainter myellip(ui.tab2);

]]>https://forum.qt.io/post/662149https://forum.qt.io/post/662149Fri, 28 May 2021 13:16:31 GMT<![CDATA[Reply to Drawing circles using QPainter on Fri, 28 May 2021 12:59:38 GMT]]>@n-2204
Hi,
maybe try use function paintEvent() in tab2 ie:

void tab2::paintEvent(QPaintEvent* event)  
{
QPainter myellip(this);
QPen epen;
int x = 10;
epen.setWidth(3);
epen.setColor(Qt::yellow);
epen.setBrush(Qt::SolidPattern);
 // myellip.setBrush(Qt::SolidPattern);
myellip.setPen(epen);
myellip.drawEllipse(QRect(150, 300, 100, 100));
}
]]>https://forum.qt.io/post/662144https://forum.qt.io/post/662144Fri, 28 May 2021 12:59:38 GMT<![CDATA[Reply to Drawing circles using QPainter on Fri, 28 May 2021 12:37:57 GMT]]>void table_model::paintEvent(QPaintEvent* event) { QPainter myellip(this); QPen epen; int x = 10; epen.setWidth(3); epen.setColor(Qt::yellow); epen.setBrush(Qt::SolidPattern); // myellip.setBrush(Qt::SolidPattern); myellip.setPen(epen); myellip.drawEllipse(QRect(150, 300, 100, 100)); }

how can i display this circle in my tab2 (Qtabwidget)

]]>https://forum.qt.io/post/662136https://forum.qt.io/post/662136Fri, 28 May 2021 12:37:57 GMT<![CDATA[Reply to Drawing circles using QPainter on Fri, 28 May 2021 10:30:34 GMT]]>09cf0862-54b2-457d-b0e3-4af3757c3add-image.png
like this I need to do
How to do ?
If anyone has any example related to this plz share

]]>https://forum.qt.io/post/662001https://forum.qt.io/post/662001Fri, 28 May 2021 10:30:34 GMT<![CDATA[Reply to Drawing circles using QPainter on Thu, 27 May 2021 19:21:57 GMT]]>Hi,

Do you mean as an overlay ?

]]>https://forum.qt.io/post/661952https://forum.qt.io/post/661952Thu, 27 May 2021 19:21:57 GMT