[Discuss-gnuradio] [GRC] Print samples when saving screenshot

[Merlin Chlosta]

Hi all,

GRC is very handy and so is the screenshot function. It's much faster to take a 
screenshot than to record all data and plot it afterwards. However I found 
myself taking a lot of screenshots twice because e.g. the label was wrong. Also 
the plots did not meet my requirements for printing, so I had to go for the 
record-everything-method anyway.

I think GRC could print out the samples when saving a screenshot. You'll then 
have 1. a fast tool to snapshot your signals and 2. accurate data in case you 
need further analysis or different plot style.

I hacked this into the gr-qtgui code, see below. Any comments on this? I'm 
pretty sure it's not done right.

What do you think of this feature? Does this already exist and I did not find 
it?

--Merlin Chlosta

---
commit 5df55a2ec563002161d43cca53aad119a32a38f2
Author: Merlin Chlosta <address@hidden>
Date:   Tue Apr 12 22:41:37 2016 +0200

    DisplayForm: Print samples when saving screenshot

diff --git a/gr-qtgui/include/gnuradio/qtgui/DisplayPlot.h 
b/gr-qtgui/include/gnuradio/qtgui/DisplayPlot.h
index eba12e2..1e946f8 100644
--- a/gr-qtgui/include/gnuradio/qtgui/DisplayPlot.h
+++ b/gr-qtgui/include/gnuradio/qtgui/DisplayPlot.h
@@ -127,6 +127,8 @@ public:
 
   virtual void replot() = 0;
 
+  std::vector<QwtPlotCurve*> d_plot_curve;
+
   const QColor getLineColor1 () const;
   const QColor getLineColor2 () const;
   const QColor getLineColor3 () const;
@@ -284,7 +286,6 @@ protected slots:
 
 protected:
   int d_nplots;
-  std::vector<QwtPlotCurve*> d_plot_curve;
 
   QwtPlotPanner* d_panner;
   QwtPlotZoomer* d_zoomer;
diff --git a/gr-qtgui/include/gnuradio/qtgui/displayform.h 
b/gr-qtgui/include/gnuradio/qtgui/displayform.h
index 1da1383..c23067a 100644
--- a/gr-qtgui/include/gnuradio/qtgui/displayform.h
+++ b/gr-qtgui/include/gnuradio/qtgui/displayform.h
@@ -30,6 +30,7 @@
 
 #include <qwt_plot_grid.h>
 #include <qwt_plot_layout.h>
+#include <qwt_plot_curve.h>
 
 #include <gnuradio/qtgui/DisplayPlot.h>
 #include <gnuradio/qtgui/form_menus.h>
diff --git a/gr-qtgui/lib/displayform.cc b/gr-qtgui/lib/displayform.cc
index 13c2d8a..3f78502 100644
--- a/gr-qtgui/lib/displayform.cc
+++ b/gr-qtgui/lib/displayform.cc
@@ -359,6 +359,17 @@ DisplayForm::saveFigure()
 {
   QPixmap qpix = QPixmap::grabWidget(this);
 
+  std::vector<QwtPlotCurve*> plot_curve = getPlot()->d_plot_curve;
+
+  std::cout << "Screenshot:" << std::endl;
+  for (int plot = 0; plot < plot_curve.size(); plot++) {
+    std::cout << "Plot curve #" << plot << std::endl;
+    for (int i = 0; i < plot_curve[plot]->dataSize(); i++) {
+      std::cout << plot_curve[plot]->y(i) << ", ";
+    }
+    std::cout << std::endl;
+  }
+
   QString types = QString(tr("JPEG file (*.jpg);;Portable Network Graphics 
file (*.png);;Bitmap file (*.bmp);;TIFF file (*.tiff)"));
 
   QString filename, filetype;