+void Annotation::paint(QPainter &p, QColor text_color, int h,
+ int left, int right, double samples_per_pixel, double pixels_offset,
+ int y)
+{
+ const double start = _start_sample / samples_per_pixel -
+ pixels_offset;
+ const double end = _end_sample / samples_per_pixel -
+ pixels_offset;
+ const QColor fill = Colours[(_format * (countof(Colours) / 2 + 1)) %
+ countof(Colours)];
+ const QColor outline(fill.darker());
+
+ if (start > right + DrawPadding || end < left - DrawPadding)
+ return;
+
+ if (_start_sample == _end_sample)
+ draw_instant(p, fill, outline, text_color, h,
+ start, y);
+ else
+ draw_range(p, fill, outline, text_color, h,
+ start, end, y);
+}
+
+void Annotation::draw_instant(QPainter &p, QColor fill, QColor outline,
+ QColor text_color, int h, double x, int y)
+{
+ const QString text = _annotations.empty() ?
+ QString() : _annotations.back();
+ const double w = min(p.boundingRect(QRectF(), 0, text).width(),
+ 0.0) + h;
+ const QRectF rect(x - w / 2, y - h / 2, w, h);
+
+ p.setPen(outline);
+ p.setBrush(fill);
+ p.drawRoundedRect(rect, h / 2, h / 2);
+
+ p.setPen(text_color);
+ p.drawText(rect, Qt::AlignCenter | Qt::AlignVCenter, text);
+}
+
+void Annotation::draw_range(QPainter &p, QColor fill, QColor outline,
+ QColor text_color, int h, double start, double end, int y)
+{
+ const double top = y + .5 - h / 2;
+ const double bottom = y + .5 + h / 2;
+
+ p.setPen(outline);
+ p.setBrush(fill);
+
+ // If the two ends are within 1 pixel, draw a vertical line
+ if (start + 1.0 > end)
+ {
+ p.drawLine(QPointF(start, top), QPointF(start, bottom));
+ return;
+ }
+
+ const double cap_width = min((end - start) / 2, EndCapWidth);
+
+ QPointF pts[] = {
+ QPointF(start, y + .5f),
+ QPointF(start + cap_width, top),
+ QPointF(end - cap_width, top),
+ QPointF(end, y + .5f),
+ QPointF(end - cap_width, bottom),
+ QPointF(start + cap_width, bottom)
+ };
+
+ p.drawConvexPolygon(pts, countof(pts));
+
+ if (_annotations.empty())
+ return;
+
+ QRectF rect(start + cap_width, y - h / 2,
+ end - start - cap_width * 2, h);
+ p.setPen(text_color);
+
+ // Try to find an annotation that will fit
+ QString best_annotation;
+ int best_width = 0;
+
+ BOOST_FOREACH(QString &a, _annotations) {
+ const int w = p.boundingRect(QRectF(), 0, a).width();
+ if (w <= rect.width() && w > best_width)
+ best_annotation = a, best_width = w;
+ }
+
+ if (best_annotation.isEmpty())
+ best_annotation = _annotations.back();
+
+ // If not ellide the last in the list
+ p.drawText(rect, Qt::AlignCenter, p.fontMetrics().elidedText(
+ best_annotation, Qt::ElideRight, rect.width()));
+}
+