CursorHeader: Use the same number format as the ruler.

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

diff --git a/pv/view/ruler.cpp b/pv/view/ruler.cpp
index 86f73f95e457c7306cbc51e6e55b51e4de939417..3cc2eb173404e0213c87d6161c198f2b00ad94c1 100644 (file)
--- a/pv/view/ruler.cpp
+++ b/pv/view/ruler.cpp
@@ -52,42 +52,16 @@ QSize Ruler::sizeHint() const
 
 void Ruler::paintEvent(QPaintEvent*)
 {
-       const double SpacingIncrement = 32.0f;
-       const double MinValueSpacing = 32.0f;
        const int ValueMargin = 3;
 
        QPainter p(this);
        p.setRenderHint(QPainter::Antialiasing);
 
-       double min_width = SpacingIncrement, typical_width;
-       double tick_period;
-       unsigned int prefix;
-
-       // Find tick spacing, and number formatting that does not cause
-       // value to collide.
-       do
-       {
-               const double min_period = _view.scale() * min_width;
-
-               const int order = (int)floorf(log10f(min_period));
-               const double order_decimal = pow(10.0, order);
-
-               unsigned int unit = 0;
-
-               do
-               {
-                       tick_period = order_decimal * ScaleUnits[unit++];
-               } while (tick_period < min_period && unit < countof(ScaleUnits));
-
-               prefix = (order - pv::util::FirstSIPrefixPower) / 3;
+       std::pair<double, unsigned int> spacing =
+               calculate_tick_spacing(p, _view.scale(), _view.offset());
 
-               typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
-                       AlignLeft | AlignTop, pv::util::format_time(_view.offset(),
-                       prefix)).width() + MinValueSpacing;
-
-               min_width += SpacingIncrement;
-
-       } while(typical_width > tick_period / _view.scale());
+       double tick_period = spacing.first;
+       unsigned int prefix = spacing.second;
 
        const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
                AlignLeft | AlignTop, "8").height();
@@ -163,5 +137,41 @@ void Ruler::hover_point_changed()
        update();
 }
 
+std::pair<double, unsigned int> Ruler::calculate_tick_spacing(
+       QPainter& p, double scale, double offset)
+{
+       const double SpacingIncrement = 32.0f;
+       const double MinValueSpacing = 32.0f;
+
+       double min_width = SpacingIncrement, typical_width;
+
+       double tick_period;
+       unsigned int prefix;
+
+       do {
+               const double min_period = scale * min_width;
+
+               const int order = (int)floorf(log10f(min_period));
+               const double order_decimal = pow(10.0, order);
+
+               unsigned int unit = 0;
+
+               do {
+                       tick_period = order_decimal * ScaleUnits[unit++];
+               } while (tick_period < min_period && unit < countof(ScaleUnits));
+
+               prefix = (order - pv::util::FirstSIPrefixPower) / 3;
+
+               typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
+                       AlignLeft | AlignTop, pv::util::format_time(offset,
+                       prefix)).width() + MinValueSpacing;
+
+               min_width += SpacingIncrement;
+
+       } while(typical_width > tick_period / scale);
+
+       return std::make_pair(tick_period, prefix);
+}
+
 } // namespace view
 } // namespace pv