QT drawing a circle

Question

I'm learning QT, and had a quick question:

What would be the best way to draw a circle with radius r with the center point at x,y?

Thanks!

Asking for a tutorial was just a side note, the main question was asking about the circle. — Nathan, Jun 29 '13 at 01:39
Oh, for what it's worth: for just drawing the circle, it look like pretty much a dupe of [another question](http://stackoverflow.com/q/9517427/179910). — Jerry Coffin, Jun 29 '13 at 01:50

score 14 · Accepted Answer · edited Nov 03 '15 at 07:46

In a paintEvent use this:

In a QGraphicsView/QGraphicsScene use this:

The last link listed, is an overloaded method that allows you to enter the center point with the two radii specified.

void QPainter::drawEllipse ( const QPointF & center, qreal rx, qreal ry )

So your code would look something like:

// inside MyWidget::paintEvent()
painter.drawEllipse(QPointF(x,y), radius, radius);

Hope that helps.

1 Answers1