ultrasound: reworked after tests

- new classes in frappy_psi/ultrasound.py and frappy_psi/adq.mr.py
- add signal plottter
- move clients to bin/ directory

Change-Id: I8db8e5ebc082c346278f09e0e54504e070655f14

frappy_psi/iqplot.py

@@ -7,10 +7,12 @@ Created on Tue Feb  4 11:07:56 2020
 import numpy as np
 import matplotlib.pyplot as plt
 
+NAN = float('nan')
+
+
 def rect(x1, x2, y1, y2):
     return np.array([[x1,x2,x2,x1,x1],[y1,y1,y2,y2,y1]])
 
-NAN = float('nan')
 
 def rects(intervals, y12):
     result = [rect(*intervals[0], *y12)]
@@ -19,13 +21,14 @@ def rects(intervals, y12):
         result.append(rect(*x12, *y12))
     return np.concatenate(result, axis=1)    
 
+
 class Plot:
     def __init__(self, maxy):
         self.lines = {}
         self.yaxis = ((-2 * maxy, maxy), (-maxy, 2 * maxy))
         self.first = True
         self.fig = None
-        
+
     def set_line(self, iax, name, data, fmt, **kwds):
         """
         plot or update a line
@@ -54,6 +57,9 @@ class Plot:
             self.fig = None
             self.first = True
         
+    def on_close(self, event):
+        self.fig = None
+
     def plot(self, curves, rois=None, average=None):
         boxes = rects(rois[1:], self.yaxis[0])
         pbox = rect(*rois[0], *self.yaxis[1])
@@ -68,6 +74,7 @@ class Plot:
             if self.first:
                 plt.ion()
                 self.fig, axleft = plt.subplots(figsize=(15,7))
+                self.fig.canvas.mpl_connect('close_event', self.on_close)
                 plt.title("I/Q", fontsize=14)
                 axleft.set_xlim(0, curves[0][-1])
                 self.ax = [axleft, axleft.twinx()]
@@ -95,7 +102,7 @@ class Plot:
                 plt.tight_layout()
         finally:
             self.first = False
-            
+
         plt.draw()
         self.fig.canvas.draw()
         self.fig.canvas.flush_events()