added classes for PV/Image

morioc/channels.py

@@ -0,0 +1,51 @@
+from types import SimpleNamespace
+
+
+class PV:
+
+    def __init__(self, ioc, name):
+        self.ioc = ioc
+        self.name = name
+
+    def get(self):
+        name = self.name
+        return self.ioc.get(name)
+
+    def put(self, value):
+        name = self.name
+        data = {name: value}
+        self.ioc.serve(**data)
+
+
+
+class Image:
+
+    def __init__(self, ioc, name):
+        self.ioc = ioc
+        self.name = name
+        self.pvs = SimpleNamespace(
+            fpicture = PV(ioc, name + ":FPICTURE"),
+            width    = PV(ioc, name + ":WIDTH"),
+            height   = PV(ioc, name + ":HEIGHT")
+        )
+
+
+    def get(self):
+        fpicture = self.pvs.fpicture.get()
+        width    = self.pvs.width.get()
+        height   = self.pvs.height.get()
+
+        fpicture.shape = (width, height)
+        return fpicture
+
+
+    def put(self, img):
+        width, height = img.shape
+        fpicture = img.ravel()
+
+        self.pvs.fpicture.put(fpicture)
+        self.pvs.width.put(width)
+        self.pvs.height.put(height)
+
+
+