CODEWITHSUNDEEP
pythonbokeh
Jan
Jan

Reputation: 566

Bokeh - how to add y value to y-axis of horizontal Span?

How can I show and highlight the value of the horizontal Span on the y-axis?

import bokeh as bk
import bokeh.plotting as bkplot
#bkplot.output_notebook() # to show inline

x = np.arange(3)
y = x**2

source = bk.models.ColumnDataSource(dict(x=x, y=y))

p = bkplot.figure(plot_width=500, plot_height=300)

glyph = bk.models.Line(x="x", y="y", line_width=6)
p.add_glyph(source, glyph)

top_span = bk.models.Span(location=3.5, dimension='width', line_color='green', line_width=2)
bottom_span = bk.models.Span(location=1.5, dimension='width', line_color='red', line_width=2)
p.renderers.extend([top_span, bottom_span])

bkplot.show(p)

Result:

enter image description here

Desired result:

enter image description here

Upvotes: 2

Views: 1235

Answers (1)

hyles_lineata
hyles_lineata

Reputation: 416

There's been a discussion of this very issue in Bokeh's github: https://github.com/bokeh/bokeh/issues/7309

So having labels on Spans in the axis area vs. the plot area is not yet implemented.

If you're okay with labels in the plot area, though, you may want to use a Label. Here's what I was able to do with Labels:

top_span = bk.models.Span(location=3.5, dimension='width', line_color='green', line_width=2)
top_span_label = bk.models.Label(text_color='green', text=str(top_span.location), x=0, y=top_span.location)
bottom_span = bk.models.Span(location=1.5, dimension='width', line_color='red', line_width=2)
bottom_span_label = bk.models.Label(text_color=bottom_span.line_color, text=str(bottom_span.location), x=0, y=bottom_span.location)
p.renderers.extend([top_span, top_span_label, bottom_span, bottom_span_label])

enter image description here

Upvotes: 3

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