pyqtgraph/examples/customPlot.py

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# -*- coding: utf-8 -*-
##
## This example demonstrates the creation of a plot with a customized
## AxisItem and ViewBox.
##
import initExample ## Add path to library (just for examples; you do not need this)
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
import time
class DateAxis(pg.AxisItem):
def tickStrings(self, values, scale, spacing):
strns = []
for x in values:
try:
strns.append(time.strftime('%b %Y', time.localtime(x)))
except ValueError: ## Windows can't handle dates before 1970
strns.append('')
return strns
class CustomViewBox(pg.ViewBox):
def __init__(self, *args, **kwds):
pg.ViewBox.__init__(self, *args, **kwds)
self.setMouseMode(self.RectMode)
## reimplement right-click to zoom out
def mouseClickEvent(self, ev):
if ev.button() == QtCore.Qt.RightButton:
self.autoRange()
def mouseDragEvent(self, ev):
if ev.button() == QtCore.Qt.RightButton:
ev.ignore()
else:
pg.ViewBox.mouseDragEvent(self, ev)
app = pg.mkQApp()
axis = DateAxis(orientation='bottom')
vb = CustomViewBox()
pw = pg.PlotWidget(viewBox=vb, axisItems={'bottom': axis}, enableMenu=False, title="PlotItem with custom axis and ViewBox<br>Menu disabled, mouse behavior changed: left-drag to zoom, right-click to reset zoom")
dates = np.arange(8) * (3600*24*356)
pw.plot(x=dates, y=[1,6,2,4,3,5,6,8], symbol='o')
pw.show()
r = pg.PolyLineROI([(0,0), (10, 10)])
pw.addItem(r)
## Start Qt event loop unless running in interactive mode or using pyside.
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()