+ assert(data_);
+ assert(owner_);
+
+ const int y = get_visual_y();
+
+ if (!channel_->enabled())
+ return;
+
+ const deque< shared_ptr<pv::data::AnalogSegment> > &segments =
+ data_->analog_segments();
+ if (segments.empty())
+ return;
+
+ const shared_ptr<pv::data::AnalogSegment> &segment =
+ segments.front();
+
+ const double pixels_offset = pp.pixels_offset();
+ const double samplerate = segment->samplerate();
+ const pv::util::Timestamp& start_time = segment->start_time();
+ const int64_t last_sample = segment->get_sample_count() - 1;
+ const double samples_per_pixel = samplerate * pp.scale();
+ const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
+ const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
+
+ const int64_t start_sample = min(max(floor(start).convert_to<int64_t>(),
+ (int64_t)0), last_sample);
+ const int64_t end_sample = min(max((ceil(end) + 1).convert_to<int64_t>(),
+ (int64_t)0), last_sample);
+
+ if (samples_per_pixel < EnvelopeThreshold)
+ paint_trace(p, segment, y, pp.left(),
+ start_sample, end_sample,
+ pixels_offset, samples_per_pixel);
+ else
+ paint_envelope(p, segment, y, pp.left(),
+ start_sample, end_sample,
+ pixels_offset, samples_per_pixel);
+}
+
+void AnalogSignal::paint_trace(QPainter &p,
+ const shared_ptr<pv::data::AnalogSegment> &segment,
+ int y, int left, const int64_t start, const int64_t end,
+ const double pixels_offset, const double samples_per_pixel)
+{
+ const int64_t sample_count = end - start;
+
+ const float *const samples = segment->get_samples(start, end);
+ assert(samples);
+
+ p.setPen(colour_);
+
+ QPointF *points = new QPointF[sample_count];
+ QPointF *point = points;
+
+ for (int64_t sample = start; sample != end; sample++) {
+ const float x = (sample / samples_per_pixel -
+ pixels_offset) + left;
+ *point++ = QPointF(x,
+ y - samples[sample - start] * scale_);
+ }
+
+ p.drawPolyline(points, point - points);
+
+ delete[] samples;
+ delete[] points;