AnalogSignal: Implement vertical grid

diff --git a/pv/view/analogsignal.cpp b/pv/view/analogsignal.cpp
index 30cf5abf33a6dc5ac888c1fe89aa2ddd470fd6e4..b340de67edc223f16dd7cbe823a917d4b422788b 100644 (file)
--- a/pv/view/analogsignal.cpp
+++ b/pv/view/analogsignal.cpp
@@ -25,6 +25,8 @@
 #include <cstdlib>
 #include <limits>
 
+#include <QApplication>
+
 #include "analogsignal.hpp"
 #include "pv/data/analog.hpp"
 #include "pv/data/analogsegment.hpp"
@@ -43,8 +45,6 @@ using sigrok::Channel;
 namespace pv {
 namespace view {
 
-const int AnalogSignal::NominalHeight = 80;
-
 const QColor AnalogSignal::SignalColours[4] = {
        QColor(0xC4, 0xA0, 0x00),       // Yellow
        QColor(0x87, 0x20, 0x7A),       // Magenta
@@ -52,6 +52,9 @@ const QColor AnalogSignal::SignalColours[4] = {
        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;
 
 AnalogSignal::AnalogSignal(
@@ -61,7 +64,9 @@ AnalogSignal::AnalogSignal(
        Signal(session, channel),
        data_(data),
        scale_index_(0),
-       scale_index_drag_offset_(0)
+       scale_index_drag_offset_(0),
+       div_height_(3 * QFontMetrics(QApplication::font()).height()),
+       vdivs_(1)
 {
        set_colour(SignalColours[channel_->index() % countof(SignalColours)]);
 }
@@ -78,20 +83,24 @@ shared_ptr<pv::data::Analog> AnalogSignal::analog_data() const
 
 std::pair<int, int> AnalogSignal::v_extents() const
 {
-       const int h = NominalHeight / 2;
+       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_) *
-               NominalHeight / 4) - NominalHeight / 2;
+               h / 4) - h / 2;
 }
 
 void AnalogSignal::scale_handle_dragged(int offset)
 {
+       const int h = vdivs_ * div_height_;
+
        scale_index_ = scale_index_drag_offset_ -
-               (offset + NominalHeight / 2) / (NominalHeight / 4);
+               (offset + h / 2) / (h / 4);
 }
 
 void AnalogSignal::scale_handle_drag_release()
@@ -117,6 +126,8 @@ void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
        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())
@@ -148,6 +159,30 @@ void AnalogSignal::paint_mid(QPainter &p, const ViewItemPaintParams &pp)
                        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,

diff --git a/pv/view/analogsignal.hpp b/pv/view/analogsignal.hpp
index 06867a557db644f82fe5d01a7a16634a3420c10d..dd2b31dc74f20e4d536accc5652c125af29d5947 100644 (file)
--- a/pv/view/analogsignal.hpp
+++ b/pv/view/analogsignal.hpp
@@ -37,8 +37,8 @@ namespace view {
 class AnalogSignal : public Signal
 {
 private:
-       static const int NominalHeight;
        static const QColor SignalColours[4];
+       static const QColor GridMajorColor, GridMinorColor;
 
        static const float EnvelopeThreshold;
 
@@ -90,6 +90,8 @@ public:
        void paint_mid(QPainter &p, const ViewItemPaintParams &pp);
 
 private:
+       void paint_grid(QPainter &p, int y, int left, int right);
+
        void paint_trace(QPainter &p,
                const std::shared_ptr<pv::data::AnalogSegment> &segment,
                int y, int left, const int64_t start, const int64_t end,
@@ -110,6 +112,9 @@ private:
 
        int scale_index_;
        int scale_index_drag_offset_;
+
+       int div_height_;
+       int vdivs_;  // divs per positive/negative side
 };
 
 } // namespace view