#include "sigsession.h"
#include "signal.h"
+#include "extdef.h"
+
#include <QMouseEvent>
+#include <QTextStream>
+
+#include <math.h>
#include <boost/foreach.hpp>
const int SigView::SignalHeight = 50;
const int SigView::LabelMarginWidth = 70;
+const int SigView::RulerHeight = 30;
+
+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),
glClear(GL_COLOR_BUFFER_BIT);
// Plot the signal
- offset = 0;
+ offset = RulerHeight;
BOOST_FOREACH(const shared_ptr<Signal> s, sigs)
{
assert(s);
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);
offset += SignalHeight;
}
+ // Paint the ruler
+ paintRuler(painter);
+
painter.end();
}
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);
+
+ double t = ceil(_offset / tick_period) * tick_period;
+ double x = 0.0;
+ while((x = (t - _offset) / _scale + LabelMarginWidth) < width())
+ {
+ 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);
+ t += tick_period;
+ }
+}