+const int AnalogSignal::NominalHeight = 80;
+
+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 float AnalogSignal::EnvelopeThreshold = 256.0f;
+
+AnalogSignal::AnalogSignal(
+ pv::Session &session,
+ shared_ptr<Channel> channel,
+ shared_ptr<data::Analog> data) :
+ Signal(session, channel),
+ data_(data),
+ scale_index_(0),
+ scale_index_drag_offset_(0)
+{
+ set_colour(SignalColours[channel_->index() % countof(SignalColours)]);
+}
+
+AnalogSignal::~AnalogSignal()
+{
+}
+
+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 = NominalHeight / 2;
+ return make_pair(-h, h);
+}
+
+int AnalogSignal::scale_handle_offset() const
+{
+ return ((scale_index_drag_offset_ - scale_index_) *
+ NominalHeight / 4) - NominalHeight / 2;
+}
+
+void AnalogSignal::scale_handle_dragged(int offset)
+{
+ scale_index_ = scale_index_drag_offset_ -
+ (offset + NominalHeight / 2) / (NominalHeight / 4);
+}
+
+void AnalogSignal::scale_handle_drag_release()
+{
+ scale_index_drag_offset_ = scale_index_;
+}
+
+void AnalogSignal::paint_back(QPainter &p, const ViewItemPaintParams &pp)