Drawing Text In a QGraphicsWidget::paint function - c++

Question

I'm trying to draw text inside a qgraphicswidget. The scale of the scene is -180 to 180 in the horizontal and -90 to +90 in the vertical (it's a world map).
When i zoom in to individual items on the map, i want some text to show up. My code for the paint function of one particular item looks like this:
void AirportGraphicsWidget::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget) {
QPen pen;
pen.setStyle(Qt::PenStyle::NoPen);
painter->setBrush(Qt::lightGray);
painter->setPen(pen);
if (m_curr_lod <= LevelOfDetail::MEDIUM) {
painter->setBrush(QColor(206, 211, 219));
painter->drawEllipse(m_airport_significance_rect);
} else if(m_curr_lod == LevelOfDetail::HIGH) {
painter->setBrush(QColor(56, 55, 52, 150));
painter->drawEllipse(m_airport_boundary);
DrawRunways(painter, option, widget);
} else {
painter->setBrush(QColor(56, 55, 52));
painter->drawEllipse(m_airport_boundary);
pen.setStyle(Qt::PenStyle::SolidLine);
pen.setColor(Qt::black);
painter->setPen(pen);
DrawRunways(painter, option, widget);
DrawILS(painter, option, widget);
DrawCOM(painter, option, widget);
QPen pen;
pen.setStyle(Qt::PenStyle::SolidLine);
pen.setColor(Qt::white);
pen.setWidth(0);
QFont font("Arial");
font.setPixelSize(15);
painter->setFont(font);
painter->setPen(pen);
painter->drawText(m_airport_boundary, "TEST");
}
}
The drawText call does not seem to be working at all. My scale at this zoom level is very small. The m_airport_boundary QRectF variable has the following values:
{ x = -0.010286252057250001, y = -0.010286252057250001, width = 0.020572504114500002, height = 0.020572504114500002 }
the drawing of the m_airport_boundary rect is visible so I know im trying to draw in the correct location. Can anyone tell me what I'm doing wrong?
Screenshot of what is drawing... The dark circle is the m_airport_boundary ellipse. Green things are a result of DrawILS and the blue circle is DrawCOM

Answer 1

The current QTransform scale is affecting the font size.
I suggest to calculate the text position in screen space, reset the transform and then call drawText().
Here is a snippet (suppose you want to draw at the center):
QPointF pos = m_airport_boundary.center();
QTransform t = painter->transform();
painter->resetTransform();
pos = t.map(pos);
painter->drawText(pos, "TEST");