+
+void Signal::paint_label(QPainter &p, const QRect &rect)
+{
+ p.setBrush(get_colour());
+
+ const QString text(_name);
+ const QColor colour = get_colour();
+
+ const QSizeF text_size = p.boundingRect(
+ QRectF(0, 0, rect.width(), 0), 0, text).size();
+
+ const float nominal_offset = get_nominal_offset(rect);
+ const QSizeF label_size(
+ text_size.width() + LabelPadding.width() * 2,
+ text_size.height() + LabelPadding.height() * 2);
+ const float label_arrow_length = label_size.height() / 2;
+ const QRectF label_rect(
+ rect.right() - label_arrow_length - label_size.width(),
+ nominal_offset - label_size.height() / 2,
+ label_size.width(), label_size.height());
+
+ // Paint the label
+ const QPointF points[] = {
+ label_rect.topLeft(),
+ label_rect.topRight(),
+ QPointF(rect.right(), nominal_offset),
+ label_rect.bottomRight(),
+ label_rect.bottomLeft()
+ };
+
+ p.setPen(Qt::black);
+ p.setBrush(colour);
+ p.drawPolygon(points, countof(points));
+
+ // Paint the text
+ p.setPen((colour.lightness() > 64) ? Qt::black : Qt::white);
+ p.drawText(label_rect, Qt::AlignCenter | Qt::AlignVCenter, text);
+}