Holoviews: `match_aspect` for bokeh `BoxZoomTool` not working

HoloViews
1

Hi there, I’ve been plotting map data using holoviews and geoviews with the bokeh backend.

Bokeh has a zoom tool called BoxZoomTool, which allows drawing a rectangle to zoom in. Setting the kwarg match_aspect=True results in maintaining the aspect ratio, which is meaningful when working with maps. Apparently, holoviews/geoviews doesn’t properly use pass the BoxZoomTool to bokeh as match_aspect=True does not have any effect.

Examples:

Working BoxZoomTool with native bokeh only (version 3.4.1 and 3.3.4, both working as expected)

import bokeh
from bokeh.plotting import figure, show
from bokeh.models import BoxZoomTool

print(f"{bokeh.__version__=}")

fruits = ['Apples', 'Pears', 'Nectarines', 'Plums', 'Grapes', 'Strawberries']
counts = [5, 3, 4, 2, 4, 6]

box_zoom = BoxZoomTool(match_aspect=True)

p = figure(x_range=fruits, height=350, title="Fruit Counts",
           toolbar_location=None, tools=[box_zoom])

p.vbar(x=fruits, top=counts, width=0.9)

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

show(p)

Non-working holoviews code (version 1.18.3)

import numpy as np
import holoviews as hv
from bokeh.models import BoxZoomTool

hv.extension("bokeh")

print(f"{hv.__version__=}")


x,y = np.mgrid[-50:51, -50:51] * 0.1

box_zoom = BoxZoomTool(match_aspect=True)

img = hv.Image(np.sin(x**2+y**2), bounds=(-1,-1,1,1))

(img.relabel('Image') * img.sample(x=0).relabel('Cross-section')).opts(
    tabs=True,
    tools=[box_zoom])
2

Thanks! Can you file an issue on HoloViews GitHub?

3

Done: