+const QColor AnalogSignal::SignalColours[4] = {
+ QColor(0xC4, 0xA0, 0x00), // Yellow
+ QColor(0x87, 0x20, 0x7A), // Magenta
+ QColor(0x20, 0x4A, 0x87), // Blue
+ QColor(0x4E, 0x9A, 0x06) // Green
+};
+
+const QColor AnalogSignal::GridMajorColor = QColor(0xB0, 0xB0, 0xB0);
+const QColor AnalogSignal::GridMinorColor = QColor(0xD0, 0xD0, 0xD0);
+
+const float AnalogSignal::EnvelopeThreshold = 256.0f;
+
+const int AnalogSignal::MaximumVDivs = 10;
+
+AnalogSignal::AnalogSignal(
+ pv::Session &session,
+ shared_ptr<Channel> channel,
+ shared_ptr<data::Analog> data) :
+ Signal(session, channel),
+ data_(data),
+ scale_index_(4), // 20 per div
+ scale_index_drag_offset_(0),
+ div_height_(3 * QFontMetrics(QApplication::font()).height()),
+ vdivs_(1),
+ resolution_(0)
+{
+ set_colour(SignalColours[channel_->index() % countof(SignalColours)]);
+ update_scale();
+}
+
+shared_ptr<pv::data::SignalData> AnalogSignal::data() const
+{
+ return data_;
+}
+
+shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
+{
+ return data_;
+}
+
+std::pair<int, int> AnalogSignal::v_extents() const
+{
+ const int h = vdivs_ * div_height_;
+ return make_pair(-h, h);
+}
+
+int AnalogSignal::scale_handle_offset() const
+{
+ const int h = vdivs_ * div_height_;
+
+ return ((scale_index_drag_offset_ - scale_index_) *
+ h / 4) - h / 2;
+}
+
+void AnalogSignal::scale_handle_dragged(int offset)
+{
+ const int h = vdivs_ * div_height_;
+
+ scale_index_ = scale_index_drag_offset_ -
+ (offset + h / 2) / (h / 4);
+
+ update_scale();
+}
+
+void AnalogSignal::scale_handle_drag_release()
+{
+ scale_index_drag_offset_ = scale_index_;
+ update_scale();
+}
+
+void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)
+{
+ if (channel_->enabled()) {
+ Trace::paint_back(p, pp);
+ paint_axis(p, pp, get_visual_y());
+ }
+}
+
+void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
+{
+ assert(data_);
+ assert(owner_);
+
+ const int y = get_visual_y();
+
+ if (!channel_->enabled())
+ return;
+
+ paint_grid(p, y, pp.left(), pp.right());
+
+ 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 = max(1.0, 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_grid(QPainter &p, int y, int left, int right)
+{
+ p.setPen(QPen(GridMajorColor, 0.5, Qt::DashLine));
+ for (int i = 1; i <= vdivs_; i++) {
+ const int dy = i * div_height_;
+ p.drawLine(QLineF(left, y - dy, right, y - dy));
+ p.drawLine(QLineF(left, y + dy, right, y + dy));
+ }
+
+ p.setPen(QPen(GridMinorColor, 0.5, Qt::DashLine));
+ for (int i = 0; i < vdivs_; i++) {
+ const int dy = i * div_height_;
+ const float dy25 = dy + (0.25 * div_height_);
+ const float dy50 = dy + (0.50 * div_height_);
+ const float dy75 = dy + (0.75 * div_height_);
+ p.drawLine(QLineF(left, y - dy25, right, y - dy25));
+ p.drawLine(QLineF(left, y + dy25, right, y + dy25));
+ p.drawLine(QLineF(left, y - dy50, right, y - dy50));
+ p.drawLine(QLineF(left, y + dy50, right, y + dy50));
+ p.drawLine(QLineF(left, y - dy75, right, y - dy75));
+ p.drawLine(QLineF(left, y + dy75, right, y + dy75));
+ }
+}
+
+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;
+}
+
+void AnalogSignal::paint_envelope(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)