gui/applets: add histogram plot

artiq/applets/plot_hist.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3.5
+
+import numpy as np
+import pyqtgraph
+
+from artiq.applets.simple import SimpleApplet
+
+
+class HistogramPlot(pyqtgraph.PlotWidget):
+    def __init__(self, args):
+        pyqtgraph.PlotWidget.__init__(self)
+        self.args = args
+
+    def data_changed(self, data, mods):
+        try:
+            y = data[self.args.y][1]
+            if self.args.x is None:
+                x = None
+            else:
+                x = data[self.args.x][1]
+        except KeyError:
+            return
+        if x is None:
+            x = list(range(len(y)+1))
+
+        if len(y) and len(x) == len(y) + 1:
+            self.clear()
+            self.plot(x, y, stepMode=True, fillLevel=0,
+                      brush=(0, 0, 255, 150))
+
+
+def main():
+    applet = SimpleApplet(HistogramPlot)
+    applet.add_dataset("y", "Y values")
+    applet.add_dataset("x", "X values", required=False)
+    applet.run()
+
+if __name__ == "__main__":
+    main()