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| Current File : //proc/thread-self/root/home/ift/52_procpy/dataninja/workbench/pytq5_curve.py |
from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as NavigationToolbar
from matplotlib.figure import Figure
import numpy as np
from array import array
import time
import random
import threading
from datetime import datetime
from matplotlib.dates import date2num, MinuteLocator, SecondLocator, DateFormatter
import sys
X_MINUTES = 1
Y_MAX = 100
Y_MIN = 1
INTERVAL = 1
MAXCOUNTER = int(X_MINUTES * 60 / INTERVAL)
class MplCanvas(FigureCanvas):
def __init__(self):
self.fig = Figure()
self.ax = self.fig.add_subplot(111)
FigureCanvas.__init__(self, self.fig)
FigureCanvas.setSizePolicy(self, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
self.ax.set_xlabel("time of data generator")
self.ax.set_ylabel('random data value')
self.ax.legend()
self.ax.set_ylim(Y_MIN, Y_MAX)
self.ax.xaxis.set_major_locator(MinuteLocator()) # every minute is a major locator
self.ax.xaxis.set_minor_locator(SecondLocator([10, 20, 30, 40, 50])) # every 10 second is a minor locator
self.ax.xaxis.set_major_formatter(DateFormatter('%H:%M:%S')) # tick label formatter
self.curveObj = None # draw object
def plot(self, datax, datay):
if self.curveObj is None:
# create draw object once
self.curveObj, = self.ax.plot_date(np.array(datax), np.array(datay), 'bo-')
else:
# update data of draw object
self.curveObj.set_data(np.array(datax), np.array(datay))
# update limit of X axis,to make sure it can move
self.ax.set_xlim(datax[0], datax[-1])
ticklabels = self.ax.xaxis.get_ticklabels()
for tick in ticklabels:
tick.set_rotation(25)
self.draw()
class MplCanvasWrapper(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.canvas = MplCanvas()
self.vbl = QtGui.QVBoxLayout()
self.ntb = NavigationToolbar(self.canvas, parent)
self.vbl.addWidget(self.ntb)
self.vbl.addWidget(self.canvas)
self.setLayout(self.vbl)
self.dataX = []
self.dataY = []
self.initDataGenerator()
def startPlot(self):
self.__generating = True
def pausePlot(self):
self.__generating = False
pass
def initDataGenerator(self):
self.__generating = False
self.__exit = False
self.tData = threading.Thread(name="dataGenerator", target=self.generateData)
self.tData.start()
def releasePlot(self):
self.__exit = True
self.tData.join()
def generateData(self):
counter = 0
while (True):
if self.__exit:
break
if self.__generating:
newData = random.randint(Y_MIN, Y_MAX)
newTime = date2num(datetime.now())
self.dataX.append(newTime)
self.dataY.append(newData)
self.canvas.plot(self.dataX, self.dataY)
if counter >= MAXCOUNTER:
self.dataX.pop(0)
self.dataY.pop(0)
else:
counter += 1
time.sleep(INTERVAL)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = MplCanvasWrapper()
sys.exit(app.exec_())