如何在不显示所有点的情况下绘制时间序列?

时间:2017-11-19 04:42:59

标签: python pyqtgraph

我想用pyqtgraph绘制时间 - 价格曲线。

像这样:

我已经知道如何设置自定义axisitem参考

我的问题是,是否有办法显示我需要刻度字符串而不是全部?

如何跳过这些刻度线

有一个演示和一些数据,例如:

import pyqtgraph as pg
from pyqtgraph.Qt import QtCore
time=['09:38:21','09:37:41','09:37:16','09:37:11','09:36:46',
      '09:36:31','09:36:01','09:35:36','09:35:31','09:35:26',
      '09:35:06','09:34:46','09:34:06','09:33:41','09:33:36',
      '09:33:21','09:33:16','09:33:11','09:33:01','09:32:46',
      '09:32:36','09:32:26','09:32:16','09:32:01','09:31:46',
      '09:31:41','09:31:21','09:30:46','09:30:06','09:25:06']
price=[6.08,6.08,6.07,6.09,6.09,6.09,6.09,6.09,6.08,6.09,6.09,
       6.09,6.09,6.07,6.07,6.06,6.06,6.06,6.06,6.06,6.07,6.08,
       6.08,6.07,6.07,6.07,6.08,6.08,6.08,6.09 ]

xDict=dict(enumerate(time))
xValue=list(xDict.keys())

win = pg.GraphicsWindow()
bottomAxis = pg.AxisItem(orientation='bottom')
plot = win.addPlot(axisItems={'bottom': bottomAxis},name='price')
xtickts=[xDict.items()]
bottomAxis.setTicks(xtickts)
plot.plot(xValue,price)
if __name__ == '__main__':
   import sys
   if sys.flags.interactive != 1 or not hasattr( QtCore, 'PYQT_VERSION' ):
      pg.QtGui.QApplication.exec_()

如何避免显示所有时间刻度字符串?   

1 个答案:

答案 0 :(得分:0)

定义setTicks时,将每个tick定义为主要滴答。如果您改为给它两个列表,则第二个列表将用于次要刻度,请参阅:http://www.pyqtgraph.org/documentation/graphicsItems/axisitem.html#pyqtgraph.AxisItem.setTicks

对于您的问题,您可以将xtickts更改为

xtickts=[list(xDict.items())[::2], list(xDict.items())[1::2]]

然后,如果你缩放字符串,那么minorticks就会变得可见。

同样的问题:How to plot time series without showing all points?