added set_data; refactored sync_item_and_plots

grum/mainwin.py

@@ -86,6 +86,7 @@ class MainWindow(QMainWindow):
             rst.start()
             rst.server.register_function(self.new_plot)
             rst.server.register_function(self.append_data)
+            rst.server.register_function(self.set_data)
 
         self.sig_make_new_plot.connect(self.on_make_new_plot)
 
@@ -116,14 +117,17 @@ class MainWindow(QMainWindow):
         item = self.lst.get(name)
         desc = item.value
         desc.append(point)
-        alarm = True
-        for sub in self.mdi.subWindowList():
-            if name in sub.plots:
-                plot = sub.plots[name]
-                plot.setData(*desc.data)
-                alarm = False
-        item.timestamps.modification.update()
-        item.set_alarm(alarm)
+        self.sync_item_and_plots(item)
+
+    def set_data(self, name, data):
+        """
+        Set <data> as the data of the (existing) plot <name>.
+        The data is assigned to the data attribute of PlotDescription.
+        """
+        item = self.lst.get(name)
+        desc = item.value
+        desc.data = data
+        self.sync_item_and_plots(item)
 
 
     # Signal callbacks
@@ -196,6 +200,17 @@ class MainWindow(QMainWindow):
         self.lst.set(name, desc)
         return desc
 
+    def sync_item_and_plots(self, item):
+        name, desc = item.key, item.value
+        alarm = True
+        for sub in self.mdi.subWindowList():
+            if name in sub.plots:
+                plot = sub.plots[name]
+                plot.setData(*desc.data)
+                alarm = False
+        item.timestamps.modification.update()
+        item.set_alarm(alarm)
+
     def plot_single_item(self, item):
         item.timestamps.access.update()
         item.set_alarm(False)