Index: trunk/BNC/src/rinex/availplot.cpp
===================================================================
--- trunk/BNC/src/rinex/availplot.cpp	(revision 4578)
+++ trunk/BNC/src/rinex/availplot.cpp	(revision 4578)
@@ -0,0 +1,55 @@
+
+#include <qwt_scale_engine.h>
+#include <qwt_symbol.h>
+#include <qwt_plot_curve.h>
+#include <qwt_legend.h>
+
+#include "availplot.h"
+
+t_availPlot::t_availPlot(QWidget* parent, 
+                         QMap<QString, QVector<int> >* prnAvail) 
+: QwtPlot(parent) {
+
+  setTitle("Availability Plot");
+
+  // Legend
+  // ------
+  QwtLegend* legend = new QwtLegend;
+  insertLegend(legend, QwtPlot::RightLegend);
+
+  // Axes
+  // ----
+  setAxisTitle(QwtPlot::xBottom, "Epoch");
+  setAxisTitle(QwtPlot::yLeft, "PRN");
+
+  // Curves
+  // ------
+  int iC = 0;
+  QMapIterator<QString, QVector<int> > it(*prnAvail);
+  while (it.hasNext()) {
+    it.next();
+    ++iC;
+    const QString&      prn    = it.key();
+    const QVector<int>& epochs = it.value();
+
+    double xData[epochs.size()];
+    double yData[epochs.size()];
+    for (int ii = 0; ii < epochs.size(); ii++) {
+      xData[ii] = epochs[ii]/1.e5;
+      yData[ii] = iC;
+    }
+
+    QwtSymbol* symbol = new QwtSymbol( QwtSymbol::XCross );
+    symbol->setSize( 4 );
+
+    QwtPlotCurve* curve = new QwtPlotCurve(prn);
+    curve->setSymbol( symbol );
+    ///    curve->setStyle( QwtPlotCurve::NoCurve );
+    curve->setLegendAttribute( QwtPlotCurve::LegendShowSymbol );
+    curve->setXAxis(QwtPlot::xBottom);
+    curve->setYAxis(QwtPlot::yLeft);
+    curve->setSamples(xData, yData, epochs.size());
+    curve->attach(this);
+  }
+}
+
Index: trunk/BNC/src/rinex/availplot.h
===================================================================
--- trunk/BNC/src/rinex/availplot.h	(revision 4578)
+++ trunk/BNC/src/rinex/availplot.h	(revision 4578)
@@ -0,0 +1,17 @@
+#ifndef AVAILPLOT_H
+#define AVAILPLOT_H
+
+#include <QtCore>
+#include <qwt_plot.h>
+
+class t_availPlot: public QwtPlot {
+ Q_OBJECT
+
+public:
+  t_availPlot(QWidget* parent, QMap<QString, QVector<int> >* prnAvail);
+
+private:
+
+};
+
+#endif