Paint sampling points on the actual trace, not the center line

[pulseview.git] / pv / view / analogsignal.cpp

diff --git a/pv/view/analogsignal.cpp b/pv/view/analogsignal.cpp
index e40042dac9fc4057d20e595473a36fb80fdc5f20..e0e0b16aafb24389ff6a56d12fee978793c67c7b 100644 (file)
--- a/pv/view/analogsignal.cpp
+++ b/pv/view/analogsignal.cpp
@@ -459,6 +459,7 @@ void AnalogSignal::paint_logic_mid(QPainter &p, ViewItemPaintParams &pp)
        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 double pixels_per_sample = 1 / samples_per_pixel;
        const pv::util::Timestamp start = samplerate * (pp.offset() - start_time);
        const pv::util::Timestamp end = start + samples_per_pixel * pp.width();
 
@@ -471,6 +472,22 @@ void AnalogSignal::paint_logic_mid(QPainter &p, ViewItemPaintParams &pp)
                samples_per_pixel / LogicSignal::Oversampling, 0);
        assert(edges.size() >= 2);
 
+       // Check whether we need to paint the sampling points
+       GlobalSettings settings;
+       const bool show_sampling_points =
+               settings.value(GlobalSettings::Key_View_ShowSamplingPoints).toBool() &&
+               (samples_per_pixel < 0.25);
+
+       vector<QRectF> sampling_points;
+       float sampling_point_x = 0.0f;
+       int64_t sampling_point_sample = start_sample;
+       const int w = 2;
+
+       if (show_sampling_points) {
+               sampling_points.reserve(end_sample - start_sample + 1);
+               sampling_point_x = (edges.cbegin()->first / samples_per_pixel - pixels_offset) + pp.left();
+       }
+
        // Paint the edges
        const unsigned int edge_count = edges.size() - 2;
        QLineF *const edge_lines = new QLineF[edge_count];
@@ -480,8 +497,28 @@ void AnalogSignal::paint_logic_mid(QPainter &p, ViewItemPaintParams &pp)
                const float x = ((*i).first / samples_per_pixel -
                        pixels_offset) + pp.left();
                *line++ = QLineF(x, high_offset, x, low_offset);
+
+               if (show_sampling_points)
+                       while (sampling_point_sample < (*i).first) {
+                               const float y = (*i).second ? low_offset : high_offset;
+                               sampling_points.emplace_back(
+                                       QRectF(sampling_point_x - (w / 2), y - (w / 2), w, w));
+                               sampling_point_sample++;
+                               sampling_point_x += pixels_per_sample;
+                       };
        }
 
+       // Calculate the sample points from the last edge to the end of the trace
+       if (show_sampling_points)
+               while ((uint64_t)sampling_point_sample <= end_sample) {
+                       // Signal changed after the last edge, so the level is inverted
+                       const float y = (edges.cend() - 1)->second ? high_offset : low_offset;
+                       sampling_points.emplace_back(
+                               QRectF(sampling_point_x - (w / 2), y - (w / 2), w, w));
+                       sampling_point_sample++;
+                       sampling_point_x += pixels_per_sample;
+               };
+
        p.setPen(LogicSignal::EdgeColour);
        p.drawLines(edge_lines, edge_count);
        delete[] edge_lines;
@@ -499,29 +536,11 @@ void AnalogSignal::paint_logic_mid(QPainter &p, ViewItemPaintParams &pp)
 
        delete[] cap_lines;
 
-       // Return if we don't need to paint the sampling points
-       GlobalSettings settings;
-       const bool show_sampling_points =
-               settings.value(GlobalSettings::Key_View_ShowSamplingPoints).toBool();
-
-       if (!show_sampling_points || (samples_per_pixel >= 0.25))
-               return;
-
        // Paint the sampling points
-       const uint64_t sampling_points_count = end_sample - start_sample + 1;
-       QRectF *const sampling_points = new QRectF[sampling_points_count];
-       QRectF *sampling_point = sampling_points;
-
-       const int w = 1;
-       const float y_middle = high_offset - ((high_offset - low_offset) / 2);
-       for (uint64_t i = start_sample; i < end_sample + 1; ++i) {
-               const float x = (i / samples_per_pixel - pixels_offset) + pp.left();
-               *sampling_point++ = QRectF(x - (w / 2), y_middle - (w / 2), w, w);
+       if (show_sampling_points) {
+               p.setPen(SamplingPointColour);
+               p.drawRects(sampling_points.data(), sampling_points.size());
        }
-
-       p.setPen(SamplingPointColour);
-       p.drawRects(sampling_points, sampling_points_count);
-       delete[] sampling_points;
 }
 
 void AnalogSignal::paint_logic_caps(QPainter &p, QLineF *const lines,