refactor

sources.py

@@ -0,0 +1,78 @@
+from functools import wraps
+from types import SimpleNamespace
+from epics import PV
+
+
+class Source(PV):
+    """
+    PV, but waits for connection on creation
+    """
+
+    def __init__(self, pvname, *args, **kwargs):
+        self.name = pvname
+        super().__init__(pvname, *args, **kwargs)
+        self.wait_for_connection()
+
+
+
+class PVCollection:
+    """
+    Creates all PVs, then waits for connection
+    Disconnects all PVs
+    """
+
+    def __init__(self, name, **kwargs):
+        self.name = name
+#        self.pvnames = SimpleNamespace(**kwargs)
+        self.pv_dict = pv_dict = {k: PV(v) for k, v in kwargs.items()}
+        for pv in pv_dict.values():
+            pv.wait_for_connection()
+        self.pvs = SimpleNamespace(**pv_dict)
+
+    def __str__(self):
+        return self.name
+
+    def disconnect(self):
+        for pv in self.pv_dict.values(): #TODO is it better to use: pv_dict -> pvs.__dict__
+            pv.disconnect()
+
+
+
+class Camera(PVCollection):
+    """
+    Expects: pvname = "NAME:FPICTURE"
+    Also creates NAME:WIDTH and NAME:HEIGHT
+    """
+
+    #TODO: could also accept base as argument, and also append ":FPICTURE"
+
+    def __init__(self, pvname):
+        assert pvname.endswith(":FPICTURE")
+        base = pvname.rsplit(":", 1)[0]
+        super().__init__(
+            base,
+            image = pvname,
+            width = base + ":WIDTH",
+            height = base + ":HEIGHT"
+        )
+
+    def get(self):
+        data = self.pvs.image.get()
+        data.shape = self.get_shape()
+        return data
+
+    def get_shape(self):
+        width = self.pvs.width.get()
+        height = self.pvs.height.get()
+        shape = (width, height)
+        return shape
+
+    def add_callback(self, callback, **kwargs):
+        @wraps(callback)
+        def wrapper(*args, value=None, **kwargs):
+            value.shape = self.get_shape()
+            return callback(*args, value=value, **kwargs)
+        return self.pvs.image.add_callback(callback=wrapper, with_ctrlvars=False, **kwargs)
+
+
+