Added sample rate selector

[pulseview.git] / sigview.cpp

diff --git a/sigview.cpp b/sigview.cpp
index cf0983d90ba2b0cefbb798f1edcc9dda697f4f39..a8e8535923d5a2acfc1a1aa2ae84ec804315d434 100644 (file)
--- a/sigview.cpp
+++ b/sigview.cpp
@@ -23,7 +23,12 @@
 #include "sigsession.h"
 #include "signal.h"
 
+#include "extdef.h"
+
 #include <QMouseEvent>
+#include <QTextStream>
+
+#include <math.h>
 
 #include <boost/foreach.hpp>
 
@@ -32,6 +37,14 @@ using namespace std;
 
 const int SigView::SignalHeight = 50;
 const int SigView::LabelMarginWidth = 70;
+const int SigView::RulerHeight = 30;
+
+const int SigView::MinorTickSubdivision = 4;
+const int SigView::ScaleUnits[3] = {1, 2, 5};
+
+const QString SigView::SIPrefixes[9] =
+       {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
+const int SigView::FirstSIPrefixPower = -15;
 
 SigView::SigView(SigSession &session, QWidget *parent) :
        QGLWidget(parent),
@@ -73,7 +86,7 @@ void SigView::paintEvent(QPaintEvent *event)
        glClear(GL_COLOR_BUFFER_BIT);
 
        // Plot the signal
-       offset = 0;
+       offset = RulerHeight;
        BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
        {
                assert(s);
@@ -93,8 +106,8 @@ void SigView::paintEvent(QPaintEvent *event)
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);
 
-       // Paint the label
-       offset = 0;
+       // Paint the labels
+       offset = RulerHeight;
        BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
        {
                assert(s);
@@ -106,6 +119,9 @@ void SigView::paintEvent(QPaintEvent *event)
                offset += SignalHeight;
        }
 
+       // Paint the ruler
+       paintRuler(painter);
+
        painter.end();
 }
 
@@ -154,3 +170,65 @@ void SigView::setupViewport(int width, int height)
        glOrtho(0, width, height, 0, -1, 1);
        glMatrixMode(GL_MODELVIEW);
 }
+
+void SigView::paintRuler(QPainter &p)
+{
+       const double MinSpacing = 80;
+
+       const double min_period = _scale * MinSpacing;
+
+       const int order = (int)floorf(log10f(min_period));
+       const double order_decimal = pow(10, order);
+
+       int unit = 0;
+       double tick_period = 0.0f;
+
+       do
+       {
+               tick_period = order_decimal * ScaleUnits[unit++];
+       } while(tick_period < min_period && unit < countof(ScaleUnits));
+
+       const int prefix = (order - FirstSIPrefixPower) / 3;
+       assert(prefix >= 0);
+       assert(prefix < countof(SIPrefixes));
+
+       const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
+               Qt::AlignLeft | Qt::AlignTop, "8").height();
+
+       // Draw the tick marks
+       p.setPen(Qt::black);
+
+       const double minor_tick_period = tick_period / MinorTickSubdivision;
+       const double first_major_division = floor(_offset / tick_period);
+       const double first_minor_division = ceil(_offset / minor_tick_period);
+       const double t0 = first_major_division * tick_period;
+
+       int division = (int)round(first_minor_division -
+               first_major_division * MinorTickSubdivision);
+       while(1)
+       {
+               const double t = t0 + division * minor_tick_period;
+               const double x = (t - _offset) / _scale + LabelMarginWidth;
+
+               if(x >= width())
+                       break;
+
+               if(division % MinorTickSubdivision == 0)
+               {
+                       // Draw a major tick
+                       QString s;
+                       QTextStream ts(&s);
+                       ts << (t / order_decimal) << SIPrefixes[prefix] << "s";
+                       p.drawText(x, 0, 0, text_height, Qt::AlignCenter | Qt::AlignTop |
+                               Qt::TextDontClip, s);
+                       p.drawLine(x, text_height, x, RulerHeight);
+               }
+               else
+               {
+                       // Draw a minor tick
+                       p.drawLine(x, (text_height + RulerHeight) / 2, x, RulerHeight);
+               }
+
+               division++;
+       }
+}