Hi,
First I wanted to say great job! I’ve been desperately looking for a python alternative to d3.js and was very happy to discover bokeh which seems to fit my requirements perfectly.
However, I couldn’t find any documentation/examples explaining how to use the TapTool (server side, no JS!). Specifically, how can I get a reference to the clicked object?
Thank you, Yuri.
Hi Yuri,
Tap tool is responsible for selecting a portion of the source. So, in this case you can track the source and trap the changes on the source selected attribute. Here’es a modified version of the server/tap.py example that should show you what you need:
from future import division
import itertools
import numpy as np
from six.moves import zip
from bokeh.plotting import *
from bokeh.models import TapTool
xx, yy = np.meshgrid(range(0,101,4), range(0,101,4))
x = xx.flatten()
y = yy.flatten()
N = len(x)
inds = [str(i) for i in np.arange(N)]
radii = np.random.random(size=N)*0.4 + 1.7
colors = [
“#%02x%02x%02x” % (r, g, 150) for r, g in zip(np.floor(50+2x), np.floor(30+2y))
]
foo = list(itertools.permutations(“abcdef”))[:N]
bar = np.random.normal(size=N)
source = ColumnDataSource(
data=dict(
x=x,
y=y,
radius=radii,
colors=colors,
foo=foo,
bar=bar,
)
)
output_server(“tap”)
TOOLS=“crosshair,pan,wheel_zoom,box_zoom,reset,tap,previewsave”
p = figure(title=“Tappy Scatter”, tools=TOOLS)
p.circle(x, y, radius=radii, source=source,
fill_color=colors, fill_alpha=0.6,
line_color=None, name=“mystuff”)
p.text(x, y, text=inds, alpha=0.5, text_font_size=“5pt”,
text_baseline=“middle”, text_align=“center”)
tool = p.select(dict(type=TapTool))[0]
tool.names.append(“mystuff”)
def on_selection_change(obj, attr, old, new):
print “HIT!”, old, new
renderer = p.select(dict(name=“mystuff”))
scatter_ds = renderer[0].data_source
scatter_ds.on_change(‘selected’, on_selection_change)
show(p) # open a browser
cursession().poll_document(curdoc(), 0.05)
``
Thanks!
Fabio
On Tuesday, April 28, 2015 at 7:01:36 PM UTC+2, [email protected] wrote:
Hi,
First I wanted to say great job! I’ve been desperately looking for a python alternative to d3.js and was very happy to discover bokeh which seems to fit my requirements perfectly.
However, I couldn’t find any documentation/examples explaining how to use the TapTool (server side, no JS!). Specifically, how can I get a reference to the clicked object?
Thank you, Yuri.