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#!/usr/bin/env python
# $Id: pyplotA.py,v 1.2 2007/03/15 14:55:38 pjetur Exp $
#
# Simple plotting of analog input data from the K8055 board
#
# based on the running plot sample from pyQwt
# The Python version of qwt-*/examples/data_plot/data_plot.cpp
import sys
from Numeric import *
from PyQt4.Qt import *
from PyQt4.Qwt5 import *
from pyk8055 import k8055
class DataPlot(QwtPlot):
def __init__(self, *args):
QwtPlot.__init__(self, *args)
# Initialize data
self.x = arrayrange(0.0, 100.1, 0.5)
self.a1 = zeros(len(self.x), Float)
self.a2 = zeros(len(self.x), Float)
self.setTitle("Simple K8055 datascope")
self.insertLegend(Qwt.QwtLegend(), Qwt.QwtPlot.BottomLegend);
self.curve1 = QwtPlotCurve("Input 1")
self.curve2 = QwtPlotCurve("Input 2")
self.curve1.attach(self)
self.curve2.attach(self)
self.curve1.setPen(QPen(Qt.red))
self.curve2.setPen(QPen(Qt.green))
# No automatic scaling, set y-scale 0-255
self.setAxisScale(QwtPlot.yLeft,0,255,50)
mY = Qwt.QwtPlotMarker()
mY.setLineStyle(Qwt.QwtPlotMarker.HLine)
mY.setYValue(128.0)
mY.attach(self)
self.setAxisTitle(QwtPlot.xBottom, "Time (seconds)")
self.setAxisTitle(QwtPlot.yLeft, "Values")
self.startTimer(50)
self.k = k8055(0)
# __init__()
def timerEvent(self, e):
# data moves from left to right:
# shift data array right and assign new value data[0]
self.a1 = concatenate((self.a1[:1], self.a1[:-1]), 1)
self.a1[0] = self.k.ReadAnalogChannel(1)
self.a2 = concatenate((self.a2[:1], self.a2[:-1]), 1)
self.a2[0] = self.k.ReadAnalogChannel(2)
self.curve1.setData(self.x, self.a1)
self.curve2.setData(self.x, self.a2)
self.replot()
# timerEvent()
# class DataPlot
def make():
demo = DataPlot()
demo.resize(500, 300)
demo.show()
return demo
# make()
def main(args):
app = QApplication(args)
demo = make()
sys.exit(app.exec_())
# main()
if __name__ == '__main__':
main(sys.argv)
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