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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:
# produce ampl for the first half a period and 0 for the other half
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:
# main clock sweeper for any function generator
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.after(0, self.onTic)
idleTime_mS = round((deadline-stop).seconds * 1000 + (deadline-stop).microseconds/1000)
# print("Will idle for %s" % (idleTime_mS) )
self.after(idleTime_mS, self.onTic)
def after(self, idleTime_mS, cmnd):
# this function modelled after Tk.after
# it is execute 'cmnd' after idle time given in mS
# idleTime_mS = 0 means execute immediately
try:
# Tk style
self.widget.after(idleTime_mS, cmnd)
return
except AttributeError:
pass
try:
# PyQt style
t = QtCore.QTimer()
t.singleShot( idleTime_mS, cmnd )
return
except NameError:
pass
raise Exception("Something went horribly wrong: we have no mechanism for Sweeper.after()")
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
def testOnTicTk(sweeper):
print( sweeper.getPos() )
if sweeper.getPos() == sweeper.Npoints:
print("Tk sweeper is done")
sweeper.cmdStop()
sweeper.widget.destroy()
sweeper.widget.quit()
def testSweeperTk():
print("test Sweeper with Tk")
root=Tk()
root.geometry("800x600")
root.withdraw(); # do not show window
Np = 10
SweepTime = Np
print(f'Test sweeper: you should see a sequence of {Np} numbers updating about every {SweepTime/Np} seconds')
sweeper = Sweeper(root, Npoints=Np, SweepTime=SweepTime, onTicCallbacks=[testOnTicTk])
sweeper.cmdStart()
root.mainloop()
def testOnTicPyQtGraph(sweeper):
print( sweeper.getPos() )
if sweeper.getPos() == sweeper.Npoints:
print("PyQtGraph sweeper is done")
sweeper.cmdStop()
sweeper.widget.exit()
def testSweeperPyQtGraph():
print("test Sweeper with PyQtGraph")
app = QtGui.QApplication([])
Np = 10
SweepTime = Np
print(f'Test sweeper: you should see a sequence of {Np} numbers updating about every {SweepTime/Np} seconds')
sweeper = Sweeper(app, Npoints=Np, SweepTime=SweepTime, onTicCallbacks=[testOnTicPyQtGraph])
sweeper.cmdStart()
app.exec()
if __name__ == '__main__':
try:
from tkinter import Tk
testSweeperTk()
except ModuleNotFoundError:
print("Tk module not found, skipping testSweeperTk")
try:
from pyqtgraph.Qt import QtGui, QtCore
testSweeperPyQtGraph()
except ModuleNotFoundError:
print("pyqtgraph.Qt module not found, skipping testSweeperPyQtGraph")
print("Done with tests")
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