+ /**
+ * Paints the signal into a QGLWidget.
+ * @param widget the QGLWidget to paint into.
+ * @param rect the rectangular area to draw the trace into.
+ * @param scale the scale in seconds per pixel.
+ * @param offset the time to show at the left hand edge of
+ * the view in seconds.
+ **/
+ void paint(QGLWidget &widget, const QRect &rect, double scale,
+ double offset);
+
+private:
+
+ int paint_caps(Point2F *const cap_points,
+ std::vector< std::pair<int64_t, bool> > &edges,
+ bool level, double samples_per_pixel, double pixels_offset,
+ int x_offset, int y_offset);
+
+ static void paint_lines(Point2F *points, int count);
+
+ /**
+ * Get the colour of the logic signal
+ */
+ QColor get_colour() const;
+
+ /**
+ * When painting into the rectangle, calculate the y
+ * offset of the zero point.
+ **/
+ int get_nominal_offset(const QRect &rect) const;
+