From 75b8193daf5c3364fd3d760b725bb2f5d4daa4f0 Mon Sep 17 00:00:00 2001
From: "Eugeniy E. Mikhailov" <evgmik@gmail.com>
Date: Fri, 9 Apr 2021 00:02:22 -0400
Subject: make separate class for function generators

---
 funcGenerator.py | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 funcGenerator.py

(limited to 'funcGenerator.py')

diff --git a/funcGenerator.py b/funcGenerator.py
new file mode 100644
index 0000000..2bdb4dd
--- /dev/null
+++ b/funcGenerator.py
@@ -0,0 +1,158 @@
+import time  # For sleep, clock, time and perf_counter
+from datetime import datetime, timedelta
+import numpy as np
+
+class SinGen:
+    def __init__(self, ampl=1, offset=0, phase=0, sweeper=None):
+        self.ampl = ampl
+        self.phase = phase
+        self.sweeper = sweeper
+        self.offset = offset
+
+    def getValue(self, sweeper=None):
+        if sweeper is None and self.sweeper is None:
+            print("Error: generator needs sweeper")
+            return 0
+        if sweeper is None:
+            sweeper = self.sweeper
+        return self.ampl * np.sin( 2*np.pi*sweeper.getRelPos()) + self.offset
+
+class RampGen:
+    # monotonically goes from start to stop, at final point move to start
+    def __init__(self, start=0, stop=0, sweeper=None):
+        self.start = start
+        self.stop = stop
+        self.sweeper = sweeper
+
+    def getValue(self, sweeper=None):
+        if sweeper is None and self.sweeper is None:
+            print("Error: generator needs sweeper")
+            return 0
+        if sweeper is None:
+            sweeper = self.sweeper
+        return self.start +  sweeper.getRelPos()*(self.stop - self.start)
+
+class TriangleGen:
+    # monotonically goes from start to stop, once reaches stop goes back to start
+    def __init__(self, start=0, stop=0, sweeper=None):
+        self.start = start
+        self.stop = stop
+        self.sweeper = sweeper
+
+    def getValue(self, sweeper=None):
+        if sweeper is None and self.sweeper is None:
+            print("Error: generator needs sweeper")
+            return 0
+        if sweeper is None:
+            sweeper = self.sweeper
+        if sweeper.getRelPos() < 0.5:
+            return self.start +  2*sweeper.getRelPos()*(self.stop - self.start)
+        return self.start +  2*(1-sweeper.getRelPos())*(self.stop - self.start)
+
+class PulseGen:
+    # monotonically goes from start to stop, once reaches stop goes back to start
+    def __init__(self, ampl=1, sweeper=None):
+        self.ampl = ampl
+        self.sweeper = sweeper
+
+    def getValue(self, sweeper=None):
+        if sweeper is None and self.sweeper is None:
+            print("Error: generator needs sweeper")
+            return 0
+        if sweeper is None:
+            sweeper = self.sweeper
+        if sweeper.getRelPos() < 0.5:
+            return self.ampl
+        return 0
+
+class Sweeper:
+    def __init__(self, widget, Npoints, SweepTime, onTicCallbacks=[]):
+        # walk from start to stop with Npoints
+        # cnt = 1 corresponds to start
+        # cnt = Npoints corresponds to stop
+        # variables like relVar are relative to the start of the period
+        self.cnt = 0 # onTic will increase it right away
+        self.widget = widget
+        self.Npoints = Npoints
+        self.start = 1
+        self.stop = self.Npoints
+        self.SweepTime = SweepTime
+        self.onTicCallbacks = onTicCallbacks
+        self.isOn = False
+        self.isRestart = True
+        self.isTicRunning = False
+
+        self.span = self.stop - self.start
+        self.center = (self.stop + self.start)/2
+        self.dPos = self.span/(self.Npoints-1)
+        self.dT = self.SweepTime/(self.Npoints-1)
+        self.dTmS = round(self.dT*1000) # dT in milliseconds
+
+    def reset(self):
+        self.cnt = 0 # onTic will increase it right away
+        self.isRestart = False
+        self.startTime = datetime.now()
+
+    def onTic(self):
+        start = datetime.now()
+        deadline = start +  timedelta(milliseconds=self.dTmS)
+
+        if not self.isOn:
+            self.isTicRunning = False
+            return
+        self.isTicRunning = True
+        if self.isRestart:
+            self.reset()
+            self.isRestart = False
+        self.incr()
+        for cb in self.onTicCallbacks:
+            cb(self)
+        stop = datetime.now()
+        self.isTicRunning = False
+        if stop > deadline:
+            runTime = (stop-start).seconds + float((stop-start).microseconds)/1000000
+            print("Overrun: Callbacks took %s seconds instead of %s" % (runTime, self.dTmS/1000) )
+            self.widget.after(0, self.onTic)
+        
+        idleTime_mS = round((deadline-stop).seconds * 1000 + (deadline-stop).microseconds/1000)
+        # print("Will idle for %s" % (idleTime_mS) )
+        self.widget.after(idleTime_mS, self.onTic)
+
+            
+    def cmdRestart(self):
+        self.cnt = 0
+        if self.isOn:
+            self.isRestart = True
+            return
+        self.reset()
+        self.isOn = True
+        self.onTic()
+
+    def cmdStart(self):
+        self.isOn = True
+        self.onTic()
+
+    def cmdStop(self):
+        self.isOn = False
+
+    def incr(self):
+        self.cnt += 1
+        self.updPos()
+
+    def updPos(self):
+        self.relCnt = 1 + ((self.cnt-1) % self.Npoints)
+        self.pos = self.start + self.dPos * (self.relCnt - 1)
+        self.relPos = (self.pos-self.start)/self.span
+
+    def getCnt(self):
+        return self.cnt
+
+    def getRelCnt(self):
+        return self.relCnt
+
+    def getPos(self):
+        return self.pos
+
+    def getRelPos(self):
+        return self.relPos
+
-- 
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