I’m trying to determine what the best way to stream text updates to a figure via bokeh server. I’m currently streaming text updates via ColumnDataSource, but since the text is not first cleared before updating, it becomes unreadable (as you would expect).
Here is a self contained example (with some unused imports)…
Thanks,
Nick
from bokeh.server.server import Server
from bokeh.application import Application
from bokeh.application.handlers.function import FunctionHandler
from bokeh.plotting import figure, ColumnDataSource, show
from bokeh.models.tickers import FixedTicker
import bokeh.models.glyphs as glyphs
import numpy as np
import matplotlib.pyplot as plt
class random_integration(object):
def init(self):
self.x = np.arange(100)
self.y = sorted(np.random.randn(100))
self.counter = 0.
self.text = [‘Integration Number: {0:03.0f}’.format(self.counter)]
def integrate_foward(self):
self.x = np.arange(100)
self.y = sorted(np.random.randn(100))
self.counter += 1
self.text = randi.text
randi = random_integration()
def make_document(doc):
def update():
randi.integrate_foward()
# Set up model data for streaming
new_data={}
new_data['x']=randi.x
new_data['y']=randi.y
source.stream(new_data, rollover = 100)
# Set up text data for streaming
text_data=dict(
x=[50],
y=[-2],
text=['Iteration Number: {0:03.0f}'.format(randi.counter)]
)
text_source.stream(text_data,rollover = 100)
# intialize the figure
p = figure(
plot_width=500,
plot_height=600,
x_range = [0, 100],
y_range = [-3, 3],
y_axis_type="linear",
)
# ColumnDataSources give us a nice way to update the data quickly in the plot
source = ColumnDataSource(
data=dict(
x=randi.x,
y=randi.y,
)
)
text_source=ColumnDataSource(
data=dict(
x=[50],
y=[-2],
text=randi.text
)
)
# This is the line that will be updated
p.line(x = 'x', y = 'y',source = source, line_width = 2, legend = 'Random CDF')
# Add a text renderer
p.text(x=50, y=-2, text='text', text_color='black', text_font_size="10pt",
text_baseline="middle", text_align="center",source = text_source)
doc.title = "Random Distribution"
doc.add_root(p)
doc.add_periodic_callback(update, 100)
apps = {’/’: Application(FunctionHandler(make_document))}
server = Server(apps, port=5000)
server.start()
``
