Wheel_zoom problems?

When I try to use the wheel_zoom tool, I get some strange behavior. If I scroll just near an axis, it only changes that axis. Perhaps this is intended behavior? Is there a way to remove this behavior?

(minimal?) working example:

import pandas as pd
from bokeh.io import show
from bokeh.plotting import figure
from bokeh.models import HoverTool, ColumnDataSource, WheelZoomTool

url='https://raw.githubusercontent.com/mmcguffi/random_test_cases/master/test.csv'
df=pd.read_csv(url,index_col=0)
df['x'] = pd.eval(df['x']) #convert to list
df['y'] = pd.eval(df['y']) #convert to list

hover = HoverTool(names=["1"])
TOOLTIPS='<font size="3"><b>@Feature</b> — @Type</font> <br> @Description'
plotSize=.35
plotDimen=800
p = figure(plot_height=plotDimen,plot_width=plotDimen, title="", toolbar_location=None, match_aspect=True,sizing_mode='scale_width',
               tools=[hover,'pan',"wheel_zoom"],active_scroll="wheel_zoom", tooltips=TOOLTIPS, x_range=(-plotSize, plotSize), y_range=(-plotSize, plotSize))
p.circle(x=0, y=0, radius=.205, line_color="#000000", fill_color=None, line_width=2)

source = ColumnDataSource(df)
p.patches('x', 'y', fill_color='fill_color', line_color='line_color', name="1", line_width=2, source=source)
show(p)

Screen Shot 2020-03-01 at 7.50.31 PM1680×1052 59 KB

Screen Shot 2020-03-01 at 7.50.39 PM1584×1048 66.5 KB

Furthermore, this touches on an other “bug” I have encountered – as you can see the circle is /not/ scaled in one dimension along with the patches. This also happens when I view my Bokeh plot in Full Screen zoom view via Streamlit.

In regard to that last point, this issue also rears its head if you set the toolbar_location to any position besides None:

Screen Shot 2020-03-01 at 8.07.49 PM1094×1096 58.1 KB

Ideally, the solution here is not to make the circle scale with the patches, but to make the patches not scale at all.

@mmcguffi That is indeed intended behavior, to allow for easily zooming in a single dimension. If you don’t want the axis-zooming behavior, you can set the zoom tool’s zoom_on_axis property to False.

Regarding the other question, I can dig up all the GH issues if you like, but TLDR; if you are plotting circles that have a radius in data-space units, you should probably always set match_aspect to True on the figure. That is the only way to ensure that the data-space aspect ratio, and the canvas pixel aspect ratio match up, and that is a necessary condition to avoid the situation above.

Thanks @Bryan!

In this example I do have match_aspect set to True on the plot however. Do you mean I need to set this for the individual circle?

@mmcguffi match_aspect is only a property of plots. Have you set explicit range values? match_aspect only works with default data ranges. If you set explicit range start/end values Bokeh assumes you know what you want and will not override what you specify (even if that means the aspect ratios won’t match).

Ah, removing the explicit range values indeed did solve it. Thank you for the quick help with both issues @Bryan