Change the number of minor ticks to be either 4 or 5

Depends on the current tick interval size, in the sense of the 1, 2, 5
sequence. It was originally always 4.

pv/views/trace/ruler.cpp

@@ -37,7 +37,6 @@ namespace views {
 namespace trace {
 
 const float Ruler::RulerHeight = 2.5f; // x Text Height
-const int Ruler::MinorTickSubdivision = 4;
 
 const float Ruler::HoverArrowSize = 0.5f; // x Text Height
 
@@ -143,6 +142,7 @@ void Ruler::paintEvent(QPaintEvent*)
 			view_.ruler_offset(),
 			view_.scale(),
 			width(),
+			view_.minor_tick_count(),
 			ffunc);
 	}
 
@@ -194,17 +194,18 @@ Ruler::TickPositions Ruler::calculate_tick_positions(
 	const pv::util::Timestamp& offset,
 	const double scale,
 	const int width,
+	const unsigned int minor_tick_count,
 	function<QString(const pv::util::Timestamp&)> format_function)
 {
 	TickPositions tp;
 
-	const pv::util::Timestamp minor_period = major_period / MinorTickSubdivision;
+	const pv::util::Timestamp minor_period = major_period / minor_tick_count;
 	const pv::util::Timestamp first_major_division = floor(offset / major_period);
 	const pv::util::Timestamp first_minor_division = ceil(offset / minor_period);
 	const pv::util::Timestamp t0 = first_major_division * major_period;
 
 	int division = (round(first_minor_division -
-		first_major_division * MinorTickSubdivision)).convert_to<int>() - 1;
+		first_major_division * minor_tick_count)).convert_to<int>() - 1;
 
 	double x;
 
@@ -212,9 +213,9 @@ Ruler::TickPositions Ruler::calculate_tick_positions(
 		pv::util::Timestamp t = t0 + division * minor_period;
 		x = ((t - offset) / scale).convert_to<double>();
 
-		if (division % MinorTickSubdivision == 0) {
+		if (division % minor_tick_count == 0) {
 			// Recalculate 't' without using 'minor_period' which is a fraction
-			t = t0 + division / MinorTickSubdivision * major_period;
+			t = t0 + division / minor_tick_count * major_period;
 			tp.major.emplace_back(x, format_function(t));
 		} else {
 			tp.minor.emplace_back(x);

pv/views/trace/ruler.hpp

@@ -63,8 +63,6 @@ private:
 	/// Height of the ruler in multipes of the text height
 	static const float RulerHeight;
 
-	static const int MinorTickSubdivision;
-
 	/// Height of the hover arrow in multiples of the text height
 	static const float HoverArrowSize;
 
@@ -170,6 +168,7 @@ private:
 		const pv::util::Timestamp& offset,
 		const double scale,
 		const int width,
+		const unsigned int minor_tick_count,
 		function<QString(const pv::util::Timestamp&)> format_function);
 
 protected:

pv/views/trace/view.cpp

@@ -506,6 +506,11 @@ const pv::util::Timestamp& View::tick_period() const
 	return tick_period_;
 }
 
+unsigned int View::minor_tick_count() const
+{
+	return minor_tick_count_;
+}
+
 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 {
 	if (tick_period_ != tick_period) {
@@ -896,6 +901,7 @@ void View::calculate_tick_spacing()
 				(ScaleUnits[unit++] + tp_margin);
 		} while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 
+		minor_tick_count_ = (unit == 2) ? (4) : (5);
 		tick_period = order_decimal * ScaleUnits[unit - 1];
 		tick_prefix = static_cast<pv::util::SIPrefix>(
 			(order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);

pv/views/trace/view.hpp

@@ -187,6 +187,11 @@ public:
 	 */
 	const pv::util::Timestamp& tick_period() const;
 
+	/**
+	 * Returns number of minor division ticks per time marking.
+	 */
+	unsigned int minor_tick_count() const;
+
 	/**
 	 * Returns the unit of time currently used.
 	 */
@@ -479,6 +484,7 @@ private:
 
 	pv::util::Timestamp tick_period_;
 	pv::util::SIPrefix tick_prefix_;
+	unsigned int minor_tick_count_;
 	unsigned int tick_precision_;
 	util::TimeUnit time_unit_;