PyQTGraph - X axis updating with minutes

[California]

Hello to all,
here is a simple example of graph in PyQT4. Actual time is shown in simple GUI, special button is made for calling a graph with one curve which contains 61 points. Data is stored into buffers and updated when time is xx:xx:05. Data in buffer is mooved for one place to left (value of buffer[1] goes to buffer[0] and so on, in buffer[60] new value comes). When script is started X axis is built from 0 (left) to 60 (right) poits. What I would like to have on x axis instead of constants from 0 - 60 is actual time in minutes.
Is that even possible and how to do it?

Vlado

main.py

import gui
import sys
import datetime
from graph import simple_graph
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import QTimer


if __name__ == "__main__":

    app = QtGui.QApplication(sys.argv)

    def time_show():
        now = datetime.datetime.now()
        master.Time.setText(now.strftime("%H" + ":" + "%M" + ":" + "%S"))

        if ((now.strftime("%S")) == ("05")):
            master.update_buffer_minute()

    gui_master = gui.QtGui.QTabWidget()
    master = gui.Ui_Izbira()
    master.setupUi(gui_master)

    # Buttons
    master.pushButton_Graph.clicked.connect(simple_graph)

    # Timer - Trigers updating of time label every second
    timer = QTimer()
    timer.timeout.connect(time_show)
    timer.start(1000)

    gui_master.show()
    sys.exit(app.exec_())

gui.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'test.ui'
#
# Created: Sun Apr  9 08:44:41 2017
#      by: PyQt4 UI code generator 4.11.2
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui
from Buffer_script import Buffer_Time_minute, Buffer_Zg
from graph import OUT_Buffer_Time_minute, OUT_Buffer_Zg


time_190 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]   # year, month, day, hour, minuttes, seconds, week_day, up_6_7, up, down
temp_160 = [0, 0, 0, 0, 0, 0, 0, 0, 0]      # zg, sp, bo, so, pe, zu, szg, ssp, out

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Izbira(object):
    def setupUi(self, Izbira):
        Izbira.setObjectName(_fromUtf8("Izbira"))
        Izbira.resize(530, 363)
        Izbira.setWindowTitle(_fromUtf8(""))
        self.Mainpage = QtGui.QWidget()
        self.Mainpage.setObjectName(_fromUtf8("Mainpage"))
        self.Time = QtGui.QLineEdit(self.Mainpage)
        self.Time.setGeometry(QtCore.QRect(130, 70, 261, 71))
        font = QtGui.QFont()
        font.setPointSize(47)
        font.setBold(False)
        font.setItalic(True)
        font.setWeight(50)
        self.Time.setFont(font)
        self.Time.setObjectName(_fromUtf8("Time"))
        self.pushButton_Graph = QtGui.QPushButton(self.Mainpage)
        self.pushButton_Graph.setGeometry(QtCore.QRect(130, 200, 261, 31))
        self.pushButton_Graph.setObjectName(_fromUtf8("pushButton_Graph"))
        Izbira.addTab(self.Mainpage, _fromUtf8(""))

        self.retranslateUi(Izbira)
        Izbira.setCurrentIndex(0)
        QtCore.QMetaObject.connectSlotsByName(Izbira)

    def retranslateUi(self, Izbira):
        self.pushButton_Graph.setText(_translate("Izbira", "Graph", None))
        Izbira.setTabText(Izbira.indexOf(self.Mainpage), _translate("Izbira", "Main page", None))

    def update_buffer_minute(self):
        global time_190
        a = time_190[4]
        Buffer_Time_minute(a, OUT_Buffer_Time_minute)
        b = 11
        Buffer_Zg(b, OUT_Buffer_Zg)


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Izbira = QtGui.QTabWidget()
    ui = Ui_Izbira()
    ui.setupUi(Izbira)
    Izbira.show()
    sys.exit(app.exec_())

Buffer_script.py

def Buffer_Time_minute(IN_FiFo, OUT_Buffer_Time_minute):
    i = 0
    for i in range(len(OUT_Buffer_Time_minute) - 1):
        OUT_Buffer_Time_minute[i] = OUT_Buffer_Time_minute[i + 1]
        i = i + 1
    OUT_Buffer_Time_minute[60] = IN_FiFo

def Buffer_Zg(IN_FiFo, OUT_Buffer_Zg):
    i = 0
    for i in range(len(OUT_Buffer_Zg) - 1):
        OUT_Buffer_Zg[i] = OUT_Buffer_Zg[i + 1]
        i = i + 1
    OUT_Buffer_Zg[60] = IN_FiFo

graph.py

import pyqtgraph as pg


OUT_Buffer_Zg = [5, 5, 5, 5, 5, 5, 5, 8, 8, 8, 8, 5,
    5, 7, 7, 7, 7, 7, 9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6,
    2, 2, 2, 2, 1, 1, 1, 1, 1, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3,
    6, 6, 6, 6, 0, 0, 0, 0, 0]

OUT_Buffer_Time_minute = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
    13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
    31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
    49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60]


def simple_graph():
    H = pg.plot(OUT_Buffer_Time_minute, OUT_Buffer_Zg, pen='b')
    H.setTitle('Temperature Zgoraj Spodaj')
    H.addLegend()
    H.plot(OUT_Buffer_Time_minute, OUT_Buffer_Zg, pen='r', name='Zg')
    H.showGrid(True, True)
    H.setLabel('left', 'Temperatura', units='deg C')
    H.setLabel('bottom', 'Time', units='minute')