How to write a values around a circle using QPainter class without rotating?

Question

The question is simple ! I want something like this using QPainter class.

i dont want values to be rotated. but using QPainter::rotate method I am getting the values like this(rotated format).

Can someone help me to draw the circle with values like the first image using QPainter

Answer 1

Here is the simplest code on how I would do it. Assuming I am painting in the paint event of a widget:

#define PI 3.14159265

[..]

void Widget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);

    QPoint center = rect().center();
    painter.drawEllipse(center, 2, 2);
    const int radius = 100;
    // Draw semicircle with texts on every 30".
    for (double i = .0; i <= 180.0; i += 30.0) {
        QPoint p(center.x() + radius * cos(i * PI / 180.0),
                 center.y() - radius * sin(i * PI / 180.0));
        painter.drawText(p, QString::number(i));
    }
}