如何从python端为散景图指定第n个代码,其中n是代码的数量

前几天,我问到如何控制股票行情：

How to show only evey nth categorical tickers in Bokeh

现在,我需要从Coffeescript外部提供n,其中n是第n个行情自动收录器.

基于bigreddot提供的代码段,并参考以下链接所示的代码示例：

https://bokeh.pydata.org/en/latest/docs/user_guide/extensions_gallery/widget.html#userguide-extensions-examples-widget

How do I use custom labels for ticks in Bokeh?

尽管我不了解Coffescript,但我想出了以下非常简单的代码.但是实际上,它不起作用.

编辑：

1)下面是您可以复制和运行的完整代码.
2)散景版本：0.12.13
   的Python：3.6.5

from bokeh.core.properties import Float, Instance, Tuple, Bool, Enum, String,Int
from bokeh.models import  TickFormatter, CategoricalTicker
from bokeh.io import show, output_file
from bokeh.plotting import figure

class MyTicker(CategoricalTicker):
    __implementation__ = """
    import {CategoricalTicker} from "models/tickers/categorical_ticker"
    import * as p from "core/properties"

    export class MyTicker extends CategoricalTicker
      type: "MyTicker"

      @define {
        nth: [ p.Int ]
      } 

      get_ticks: (start, end, range, cross_loc) ->
        ticks = super(start, end, range, cross_loc)

        # drops every other tick -- update to suit your specific needs
        ticks.major = ticks.major.filter((element, index) -> index % this.nth == 0)

        return ticks

    """

    nth = Int(default=2)


output_file("bars.html")

fruits = ['Apples', 'Pears', 'Nectarines', 'Plums', 'Grapes', 'Strawberries']

p = figure(x_range=fruits, plot_height=250, title="Fruit Counts",
           toolbar_location=None, tools="")

p.vbar(x=fruits, top=[5, 3, 4, 2, 4, 6], width=0.9)

p.xgrid.grid_line_color = None
p.y_range.start = 0

p.xaxis.ticker = MyTicker(nth=2)

show(p)

“ this.nth”似乎不起作用.结果为空白.

解决方法:

除非我弄错了,否则您只需将其作为实例变量访问nth即可.在它前面.

编辑：您还需要使用“胖箭头” =>在您的过滤器中,以便正确绑定(否则在该上下文中未定义).

ticks.major = ticks.major.filter((element, index) => index % this.nth == 0)

标签：python,plot,bokeh,ticker
来源： https://codeday.me/bug/20191013/1904321.html