pydata2015 berlin bokeh simple stream

code

1. simple_stream

   1. original

       import time
      
       import numpy as np
      
       from bokeh.plotting import cursession, figure, show, output_server
       from bokeh.models import GlyphRenderer
      
       x = np.linspace(0, 4*np.pi, 200)
       y = np.sin(x)
      
       output_server("simple_stream")
      
       p = figure(title="Simple streaming example")
       p.line(x, y, color="#2222aa", line_width=2)
      
       show(p)
      
       ds = p.select({"type": GlyphRenderer})[0].data_source
       while True:
           oldx = ds.data["x"]
           newx = np.hstack([oldx, [oldx[-1] + 4*np.pi/200]])
           ds.data["x"] = newx
           ds.data["y"] = np.sin(newx)
           cursession().store_objects(ds)
           time.sleep(0.5)
      

   2. convert to bokeh 0.11

       #! conding utf-8
      
       import time
       import numpy as np
      
       from bokeh.io import curdoc
       from bokeh.client import push_session
       from bokeh.models import GlyphRenderer
       from bokeh.plotting import figure, show
      
       x = np.linspace(0, 4*np.pi, 200)
       y = np.sin(x)
      
       p = figure(title="Simple streaming example")
       p.line(x, y, color="#2222aa", line_width=2)
       ds = p.select({"type": GlyphRenderer})[0].data_source
      
      
       def update():
           oldx = ds.data["x"]
           newx = np.hstack([oldx, [oldx[-1] + 4*np.pi/200]])
           ds.data["x"] = newx
           ds.data["y"] = np.sin(newx)
      
       # run every 5 milliseconds
       curdoc().add_periodic_callback(update, 5)
      
       session = push_session(curdoc(), 'simple-stream')
       # open the doc in browser
       session.show()
       # run forever
       session.loop_until_closed()
      

class GlyphRenderer(**kwargs)

1. base bokeh.models.renderers.DataRenderer

2. attr

   1. data_source local data source to use when rendering glyph on the plot

   2. glyph the glyph to render, in conjunction with supplied data source and ranges

   3. hover_glyph an optional glyph ofr inspected points

           e.g. those that are being hoverd over by a HoverTool
      

   4. level specifies the level in which to render the glyph

   5. nonselection_glyph an optional glyph used for explicitly non-selected points

   6. selection_glyph an optional glyph used for selected points

   7. x_range_name a particular(named) x-range to use for computing screen locations when rendering glyph on the plot

       if unset use the default x-range
      

   8. y_range_name see x_range_name