散景，条形图和折线图的组合

Question

我正在尝试在散景内的条形图顶部绘制一条线。我试过：

p1 = figure()...

p1.renderer.append(Bar(...))
p1.renderer.append(Line(...))

show(p1)

到目前为止我运气不好。

Answer 1

使用 Basic Glyphs 可以在 Bokeh 中的一个图中组合两个或多个图形。

对于你的问题，我们可以使用直线和矩形。

from bokeh.plotting import figure, output_file, show
from bokeh.models.ranges import Range1d
import numpy


output_file("line_bar.html")

p = figure(plot_width=400, plot_height=400)

# add a line renderer
p.line([1, 2, 3, 4, 5], [6, 7, 6, 4, 5], line_width=2)

# setting bar values
h = numpy.array([2, 8, 5, 10, 7])

# Correcting the bottom position of the bars to be on the 0 line.
adj_h = h/2

# add bar renderer
p.rect(x=[1, 2, 3, 4, 5], y=adj_h, width=0.4, height=h, color="#CAB2D6")

# Setting the y  axis range   
p.y_range = Range1d(0, 12)

p.title = "Line and Bar"

show(p)

我们得到的情节：

Answer 2

搭载@tomaskazemekas：虽然最好避免在 Bokeh 中混合绘图和图表级别，但可以使用 add_glyph:

修改高级图表对象

from bokeh.charts import Bar, output_file, show
from bokeh.models.ranges import Range1d

from bokeh.models import ColumnDataSource
from bokeh.models.glyphs import Line as Line_glyph

import numpy as np

# create dummy data
df = dict(
    x=[1, 2, 3, 4, 5],
    y=[6, 7, 6, 4, 5],
    h=[2, 8, 5, 10, 7]
)

# create high-level bar chart
p = Bar(data=df, label='x', values='h', color='dodgerblue', title="Bar and Line Plot",
        legend=False, plot_width=400, plot_height=400)

# create source data object from data
source = ColumnDataSource(data=df)

# create a line glyph object which references columns from source data
glyph = Line_glyph(x='x', y='y', line_color='grey', line_width=2)

# add the glyph to the chart
p.add_glyph(source, glyph)

# Setting the y  axis range   
p.y_range = Range1d(0, 12)

output_file("line_bar.html")

show(p)

结果类似： Bar and Line Plot

散景，条形图和折线图的组合

Bokeh, combination of bar and line chart

bokeh