散景将图例添加到步骤图 [英] bokeh add legend to Step graph
本文介绍了散景将图例添加到步骤图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在散景"的步骤图"示例中为行添加图例:
How can I add a legend to lines in Step graph example for bokeh:
https://docs.bokeh.org /en/latest/docs/reference/models/glyphs/step.html
我想在图的右上角"显示每条线的颜色和样式的图例.
I would like to have legend in 'top right' corner of plot for each line in color and style of the line.
该示例的默认代码为:
import numpy as np
from bokeh.models import ColumnDataSource, DataRange1d, Plot, LinearAxis, Grid
from bokeh.models.glyphs import Step
from bokeh.io import curdoc, show
N = 11
x = np.linspace(-2, 2, N)
y = x**2
source = ColumnDataSource(dict(x=x, y1=y, y2=y+2, y3=y+4))
xdr = DataRange1d()
ydr = DataRange1d()
plot = Plot(
title=None, x_range=xdr, y_range=ydr, plot_width=300, plot_height=300,
h_symmetry=False, v_symmetry=False, min_border=0,toolbar_location=None)
glyph1 = Step(x="x", y="y1", line_color="#f46d43", mode="before")
plot.add_glyph(source, glyph1)
glyph2 = Step(x="x", y="y2", line_dash="dashed", line_color="#1d91d0", mode="center")
plot.add_glyph(source, glyph2)
glyph3 = Step(x="x", y="y3", line_width=3, line_color="#cab2d6", mode="after")
plot.add_glyph(source, glyph3)
xaxis = LinearAxis()
plot.add_layout(xaxis, 'below')
yaxis = LinearAxis()
plot.add_layout(yaxis, 'left')
plot.add_layout(Grid(dimension=0, ticker=xaxis.ticker))
plot.add_layout(Grid(dimension=1, ticker=yaxis.ticker))
curdoc().add_root(plot)
show(plot)
推荐答案
您可以为每个字形手动添加图例条目,方法是在绘图中选择相应的渲染器,然后将其连接到LegendItem
.
这是使用您的示例的完整代码:
You can add a legend entry for each glyph manually by selecting the corresponding renderer in your plot and then connecting it to a LegendItem
.
Here's the full code using your example:
import numpy as np
from bokeh.models import ColumnDataSource, DataRange1d, Plot, LinearAxis, Grid, Legend, LegendItem
from bokeh.models.glyphs import Step
from bokeh.io import curdoc, show
N = 11
x = np.linspace(-2, 2, N)
y = x**2
source = ColumnDataSource(dict(x=x, y1=y, y2=y+2, y3=y+4))
xdr = DataRange1d()
ydr = DataRange1d()
p1 = Plot(
title=None, x_range=xdr, y_range=ydr, plot_width=300, plot_height=300,
h_symmetry=False, v_symmetry=False, min_border=0, toolbar_location=None)
glyph1 = Step(x="x", y="y1", line_color="#f46d43", mode="before")
p1.add_glyph(source, glyph1)
glyph2 = Step(x="x", y="y2", line_dash="dashed", line_color="#1d91d0", mode="center")
p1.add_glyph(source, glyph2)
glyph3 = Step(x="x", y="y3", line_width=3, line_color="#cab2d6", mode="after")
p1.add_glyph(source, glyph3)
xaxis = LinearAxis()
p1.add_layout(xaxis, 'below')
yaxis = LinearAxis()
p1.add_layout(yaxis, 'left')
p1.add_layout(Grid(dimension=0, ticker=xaxis.ticker))
p1.add_layout(Grid(dimension=1, ticker=yaxis.ticker))
li1 = LegendItem(label='red', renderers=[p1.renderers[0]])
li2 = LegendItem(label='blue', renderers=[p1.renderers[1]])
li3 = LegendItem(label='purple', renderers=[p1.renderers[2]])
legend1 = Legend(items=[li1, li2, li3], location='top_right')
p1.add_layout(legend1)
curdoc().add_root(p1)
show(p1)
这应该是结果:
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