我想用 pyqtgraph 绘制时间序列,并在 x 轴刻度上显示日期和/或时间,但我找不到怎么做。
编辑 1:似乎我应该继承 AxisItem 并重新实现 tickStrings()。我会调查一下。
编辑 2:这是我对 AxisItem 进行子类化的方式。该文档显示了如何使用该类。
from __future__ import print_function
from PySide.QtCore import *
from PySide.QtUiTools import *
from PySide.QtGui import *
import pyqtgraph as pg
import time
## Reimplements \c pyqtgraph.AxisItem to display time series.
# \code
# from caxistime import CAxisTime
# \# class definition here...
# self.__axisTime=CAxisTime(orientation='bottom')
# self.__plot=self.__glyPlot.addPlot(axisItems={'bottom': self.__axisTime}) # __plot : PlotItem
# \endcode
class CAxisTime(pg.AxisItem):
## Formats axis label to human readable time.
# @param[in] values List of \c time_t.
# @param[in] scale Not used.
# @param[in] spacing Not used.
def tickStrings(self, values, scale, spacing):
strns = []
for x in values:
try:
strns.append(time.strftime("%H:%M:%S", time.gmtime(x))) # time_t --> time.struct_time
except ValueError: # Windows can't handle dates before 1970
strns.append('')
return strns