gui/applets: add XY plot

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()