Added sample rate selector

[pulseview.git] / sigview.cpp

diff --git a/sigview.cpp b/sigview.cpp
index df1eefec2745fec15041766a4777d086d6e114eb..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>
 
@@ -31,52 +36,93 @@ using namespace boost;
 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),
         _session(session),
-       _scale(1000000000ULL),
+       _scale(1e-6),
        _offset(0)
 {
        connect(&_session, SIGNAL(dataUpdated()),
                this, SLOT(dataUpdated()));
 
        setMouseTracking(true);
+       setAutoFillBackground(false);
 }
 
 void SigView::initializeGL()
 {
-       glDisable(GL_TEXTURE_2D);
-       glDisable(GL_DEPTH_TEST);
-       glDisable(GL_COLOR_MATERIAL);
-       glEnable(GL_BLEND);
-       glEnable(GL_POLYGON_SMOOTH);
-       glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-       glClearColor(1.0, 1.0, 1.0, 0);
 }
 
 void SigView::resizeGL(int width, int height)
 {
-       glViewport(0, 0, (GLint)width, (GLint)height);
-       glMatrixMode(GL_PROJECTION);
-       glLoadIdentity();
-       glOrtho(0, width, height, 0, -1, 1);
-       glMatrixMode(GL_MODELVIEW);
+       setupViewport(width, height);
 }
 
-void SigView::paintGL()
+void SigView::paintEvent(QPaintEvent *event)
 {
-       glClear(GL_COLOR_BUFFER_BIT);
+       int offset;
 
-       QRect rect(0, 0, width(), SignalHeight);
        const vector< shared_ptr<Signal> > &sigs =
                _session.get_signals();
+
+       // Prepare for OpenGL rendering
+       makeCurrent();
+       glMatrixMode(GL_MODELVIEW);
+       glPushMatrix();
+
+       setupViewport(width(), height());
+
+       qglClearColor(Qt::white);
+       glClear(GL_COLOR_BUFFER_BIT);
+
+       // Plot the signal
+       offset = RulerHeight;
+       BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
+       {
+               assert(s);
+
+               const QRect signal_rect(LabelMarginWidth, offset,
+                       width() - LabelMarginWidth, SignalHeight);
+
+               s->paint(*this, signal_rect, _scale, _offset);
+
+               offset += SignalHeight;
+       }
+
+       // Prepare for QPainter rendering
+       glMatrixMode(GL_MODELVIEW);
+       glPopMatrix();
+
+       QPainter painter(this);
+       painter.setRenderHint(QPainter::Antialiasing);
+
+       // Paint the labels
+       offset = RulerHeight;
        BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
        {
                assert(s);
-               s->paint(*this, rect, _scale, _offset);
-               rect.translate(0, SignalHeight);
+
+               const QRect label_rect(0, offset,
+                       LabelMarginWidth, SignalHeight);
+               s->paint_label(painter, label_rect);
+
+               offset += SignalHeight;
        }
+
+       // Paint the ruler
+       paintRuler(painter);
+
+       painter.end();
 }
 
 void SigView::dataUpdated()
@@ -98,17 +144,91 @@ void SigView::mouseReleaseEvent(QMouseEvent *event)
 {
        assert(event);
 
+       const double cursor_offset = _offset + _scale * (double)event->x();
+
        switch(event->button())
        {
        case Qt::LeftButton:
-               _scale = (_scale * 2) / 3;
+               _scale *= 2.0 / 3.0;
                break;
 
        case Qt::RightButton:
-               _scale = (_scale * 3) / 2;
+               _scale *= 3.0 / 2.0;
                break;
        }
 
-       updateGL();
+       _offset = cursor_offset - _scale * (double)event->x();
+
+       update();
+}
+
+void SigView::setupViewport(int width, int height)
+{
+       glViewport(0, 0, (GLint)width, (GLint)height);
+       glMatrixMode(GL_PROJECTION);
+       glLoadIdentity();
+       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++;
+       }
+}