prepare rectangular selection

src/View/Tools/PamhyrPlot.py

@@ -17,6 +17,7 @@
 # -*- coding: utf-8 -*-
 
 import matplotlib.colors as mplcolors
+from matplotlib.widgets import RectangleSelector
 from matplotlib import ticker
 
 from tools import timestamp_to_old_pamhyr_date
@@ -100,6 +101,14 @@ class PamhyrPlot(APlot):
         self._highlight_data_update = False
         self._current_data = None  #: Current data identifier
         self._current_data_update = False
+        self._rect_select = RectangleSelector(ax=self.canvas.axes,
+                                              onselect=self.rect_select_callback,
+                                              useblit=True,
+                                              button=[1, 3],  # don't use middle button
+                                              minspanx=1.0,
+                                              minspany=1.0,
+                                              spancoords='pixels',
+                                              interactive=False)
 
     @property
     def canvas(self):
@@ -231,3 +240,10 @@ class PamhyrPlot(APlot):
 
     def onclick(self, event):
         return
+
+    def rect_select_callback(self, eclick, erelease):
+        'eclick and erelease are the press and release events'
+        x1, y1 = eclick.xdata, eclick.ydata
+        x2, y2 = erelease.xdata, erelease.ydata
+        print("(%3.2f, %3.2f) --> (%3.2f, %3.2f)" % (x1, y1, x2, y2))
+        return