pyqtgraph:如何绘制时间序列(x轴上的日期和时间)?

时间:2014-04-18 09:50:38

标签: time-series pyqtgraph

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: 看起来我应该继承AxisItem并重新实现tickStrings()。我会调查一下。

编辑2: 这是我如何将AxisItem子类化。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

1 个答案:

答案 0 :(得分:3)

看看this gist。您可以修改tickStrings()以根据比例更改格式字符串