散景烛台在蜡烛之间形成小间隙

Question

我有一个与散景效果很好的烛台图。我遇到的唯一问题是数据是 1 分钟数据，图表看起来有点挤在一起。有没有办法在烛台之间创建一个小间隙？

更新-代码

import pandas as pd

from datetime import timedelta

from bokeh.plotting import figure, ColumnDataSource
from bokeh.models.widgets import Dropdown
from bokeh.io import curdoc
from bokeh.layouts import column

from bokeh.models import BooleanFilter, CDSView, Select, Range1d, HoverTool
from bokeh.palettes import Category20
from bokeh.models.formatters import NumeralTickFormatter
from bokeh.io import output_file, show

# Define constants
W_PLOT = 1700
H_PLOT = 600
TOOLS = "pan,box_zoom,zoom_in,zoom_out,redo,undo,reset,save,crosshair"

VBAR_WIDTH = 60*60*10000
# VBAR_WIDTH =  12*60*60*1000 # half day in ms
# VBAR_WIDTH =  24*60*60*1000 # day in ms

RED = Category20[7][6]
GREEN = Category20[5][4]

def plot_test(df: pd.DataFrame,
          name: str) -> None:

inc = df.price_close > df.price_open
dec = ~inc

cds = ColumnDataSource(data=df)   
view_inc = CDSView(source=cds, filters=[BooleanFilter(inc)])
view_dec = CDSView(source=cds, filters=[BooleanFilter(dec)])    

fig = figure(plot_width=W_PLOT, plot_height=H_PLOT, 
             tools=TOOLS,
             x_axis_type="datetime",
             title=name,
             toolbar_location='above')

# Plot candles
# High and low
fig.segment(x0='time_stamp', y0='price_high', 
            x1='time_stamp', y1='price_low', 
            source=cds, view=view_inc, 
            color='black')
fig.segment(x0='time_stamp', y0='price_high', 
            x1='time_stamp', y1='price_low', 
            source=cds, view=view_dec,
            color='black')

# Open and close
r1 = fig.vbar(x='time_stamp', width=timedelta(minutes=1), 
         top='price_open', bottom='price_close', 
              source=cds, view=view_inc,
              fill_color=GREEN, line_color="black")
r2 = fig.vbar(x='time_stamp', width=timedelta(minutes=1), 
         top='price_open', bottom='price_close', 
              source=cds, view=view_dec,
              fill_color=RED, line_color="black")

# let add a moving average
fig.line(x='time_stamp', y='ma_20', source=cds, legend_label='MA 20')

# entry signals
fig.triangle(x='time_stamp', y='buy', source=cds, fill_color=GREEN,
             size=10)
fig.inverted_triangle(x='time_stamp', y='sell', source=cds, 
                      fill_color=RED, size=10)

# Set up the hover tooltip to display some useful data
fig.add_tools(HoverTool(
    renderers=[r1],
    tooltips=[
        ("Open", "@price_open{0.0000}"),
        ("High", "@price_high{0.0000}"),
        ("Low", "@price_low{0.0000}"),
        ("Close", "@price_close{0.0000}"),
        ("Date", "@time_stamp{%Y-%m-%d %H:%M}"),
    ],
    formatters={
        '@time_stamp': 'datetime'
        }))

fig.add_tools(HoverTool(
    renderers=[r2],
    tooltips=[
        ("Open", "@price_open{0.0000}"),
        ("High", "@price_high{0.0000}"),
        ("Low", "@price_low{0.0000}"),
        ("Close", "@price_close{0.0000}"),
        ("Date", "@time_stamp{%Y-%m-%d %H:%M}"),
    ],
    formatters={
        '@time_stamp': 'datetime'
        }))

elements = list()
elements.append(fig)

curdoc().add_root(column(elements))
curdoc.title = 'Blah'

show(fig)

Answer 1

正如我的 bigredot 所指出的，为了更改烛台的宽度，可以通过设置 vbar 方法的宽度参数来完成。

下面的数字适用于每日数据。对于更高频率的数据，我会减少“12”

VBAR_WIDTH = 126060*1000 # 半天（以毫秒为单位）

Answer 2

最初的问题是关于垂直条之间的空间。使用 vbar 方法的宽度参数可以减少每个条形消耗的绘图宽度，这是否正确？另一个考虑因素是增加图形的宽度也会增加条形之间的空间。