From db06e73372d065ba31cc4843fae0545c22471a6f Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sun, 10 Jan 2016 18:19:34 +0800
Subject: [PATCH] gui/applets: add XY plot

---
 artiq/applets/plot_xy.py | 59 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100755 artiq/applets/plot_xy.py

diff --git a/artiq/applets/plot_xy.py b/artiq/applets/plot_xy.py
new file mode 100755
index 000000000..4b8221f42
--- /dev/null
+++ b/artiq/applets/plot_xy.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python3.5
+
+import numpy as np
+import pyqtgraph
+
+from artiq.applets.simple import SimpleApplet
+
+
+class XYPlot(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]
+        except KeyError:
+            return
+        x = data.get(self.args.x, (False, None))[1]
+        if x is None:
+            x = list(range(len(y)))
+        error = data.get(self.args.error, (False, None))[1]
+        fit = data.get(self.args.fit, (False, None))[1]
+
+        if not len(y) or len(y) != len(x):
+            return
+        if error is not None and hasattr(error, "__len__"):
+            if not len(error):
+                error = None
+            elif len(error) != len(y):
+                return
+        if fit is not None:
+            if not len(fit):
+                fit = None
+            elif len(fit) != len(y):
+                return
+
+        self.clear()
+        self.plot(x, y, pen=None, symbol="x")
+        if error is not None:
+            # See https://github.com/pyqtgraph/pyqtgraph/issues/211
+            if hasattr(error, "__len__") and not isinstance(error, np.ndarray):
+                error = np.array(error)
+            errbars = pg.ErrorBarItem(x=np.array(x), y=np.array(y), height=error)
+            self.addItem(errbars)
+        if fit is not None:
+            self.plot(x, fit)
+
+
+def main():
+    applet = SimpleApplet(XYPlot)
+    applet.add_dataset("y", "Y values")
+    applet.add_dataset("x", "X values", required=False)
+    applet.add_dataset("error", "Error bars for each X value", required=False)
+    applet.add_dataset("fit", "Fit values for each X value", required=False)
+    applet.run()
+
+if __name__ == "__main__":
+    main()