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这里是我写的代码。我从 pandas DF 获取数据(此处未粘贴)。x 值来自作为 DateTime 列的 DF 索引列。我要解决的问题是:

工具提示 = [("index", "$index"),("(时间,温度)", "($x, $y)"),]

当我必须将 $x 格式更改为正确的格式以便在散景图上的悬停窗口中查看时间格式时。

看python代码

import datetime as dt
from bokeh.plotting import figure, output_file, show

from bokeh.layouts import gridplot
from bokeh.models import ColumnDataSource, CDSView, BooleanFilter
from bokeh.models import DatetimeTickFormatter



x=df_bases.index

y0=df_bases["base_1"]
y1=df_bases["base_5"]
y2=df_bases["base_12"]



# output to static HTML file
output_file("temperatures from thermocouples.html")



# add some renderers

output_file("Thermocouples temperature.html", title="Thermocouples temperature")

TOOLTIPS = [("index", "$index"),("(Time,Temperature)", "($x, $y)"),]


# create a new plot with a datetime axis type
p = figure( tooltips=TOOLTIPS , plot_width=1250, plot_height=580, x_axis_type="datetime", x_axis_label='Time', 
           y_axis_label='Temperature [°C]', title="Thermocouples temperature") 


p.line(x, y0, legend="thermocouple 1", line_width=1 , color='navy', alpha=1)
p.line(x, y1, legend="thermocouple 5", color="green")
p.line(x, y2, legend="thermocouple 12", line_width=1 , color='orange', alpha=1)#, line_dash="4 4")

p.border_fill_color = "whitesmoke"


p.xaxis.formatter=DatetimeTickFormatter(
    microseconds = ['%Y-%m-%d %H:%M:%S.%f'],
    milliseconds = ['%Y-%m-%d %H:%M:%S.%3N'],
    seconds = ["%Y-%m-%d %H:%M:%S"],
    minsec = ["%Y-%m-%d %H:%M:%S"],
    minutes = ["%Y-%m-%d %H:%M:%S"],
    hourmin = ["%Y-%m-%d %H:%M:%S"],
    hours=["%Y-%m-%d %H:%M:%S"],
    days=["%Y-%m-%d %H:%M:%S"],
    months=["%Y-%m-%d %H:%M:%S"],
    years=["%Y-%m-%d %H:%M:%S"],
)


p.title.align = 'center'





# create a column data source for the plots to share
source = ColumnDataSource(data=dict(x=x, y0=y0, y1=y1, y2=y2))

# create a view of the source for one plot to use
view = CDSView(source=source)




# show the results
show(p)
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1 回答 1

1

目前(从 Bokeh 1.2 开始)悬停工具没有任何“始终开启”模式它只悬停以响应添加到绘图中的命中测试字形。此外,无法将格式应用于“特殊变量”之类$x的(从 Bokeh 2.0 开始就有可能)。自定义格式化程序只能应用于数据列的悬停工具提示。鉴于此,我最好的建议是改用使用@x(它询问“x”数据列,而不是 x 鼠标位置”。如果这样做,您可以使用文档的“格式化工具提示字段”部分中的所有技术。

由于您没有提供完整的示例(没有要运行的数据),我只能提供部分未经测试的建议:

# use @x{%F} to specify the %F datetime format (or choose another) for the x column
TOOLTIPS = [("index", "$index"),("(Time,Temperature)", "(@x{%F}, $y)")]

# tell bokeh to use the "datetime" formatter for the x column
p.hover.formatters = {'x': 'datetime'}

# just a suggestion, often useful for timeseries plots
p.hover.mode = 'vline'
于 2019-06-08T21:44:09.130 回答