Python Bokeh – Plotting Dots on a Graph

Bokeh is a Python interactive data visualization. It renders its plots using HTML and JavaScript. It targets modern web browsers for presentation providing elegant, concise construction of novel graphics with high-performance interactivity.

Bokeh can be used to plot dots on a graph. Plotting dots on a graph can be done using the dot() method of the plotting module.

plotting.figure.dot()

Syntax : dot(parameters)

Parameters :

  • x : x-coordinates of the center of the dot markers
  • y : y-coordinates of the center of the dot markers
  • size : diameter of the dot markers, default is 4
  • angle : angle of rotation of the dot markers, default is 0
  • angle_units : unit of the angle, default is rad
  • fill_alpha : fill alpha value of the dot markers
  • fill_color : fill color value of the dot markers
  • line_alpha : percentage value of line alpha, default is 1
  • line_cap : value of line cap for the line, default is butt
  • line_color : color of the line, default is black
  • line_dash : value of line dash such as :
    • solid
    • dashed
    • dotted
    • dotdash
    • dashdot

    default is solid

  • line_dash_offset : value of line dash offset, default is 0
  • line_join : value of line join, default in bevel
  • line_width : value of the width of the line, default is 1
  • name : user-supplied name for the model
  • tags : user-supplied values for the model

Other Parameters :



  • alpha : sets all alpha keyword arguments at once
  • color : sets all color keyword arguments at once
  • legend_field : name of a column in the data source that should be used
  • legend_group : name of a column in the data source that should be used
  • legend_label : labels the legend entry
  • muted : determines whether the glyph should be rendered as muted or not, default is False
  • name : optional user-supplied name to attach to the renderer
  • source : user-supplied data source
  • view : view for filtering the data source
  • visible : determines whether the glyph should be rendered or not, default is True
  • x_range_name : name of an extra range to use for mapping x-coordinates
  • y_range_name : name of an extra range to use for mapping y-coordinates
  • level : specifies the render level order for this glyph

Returns : an object of class GlyphRenderer

Example 1 :In this example we will be using the default values for plotting the graph. We have provided the size attribute to make the glyph visible.

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# importing the modules
from bokeh.plotting import figure, output_file, show
      
# file to save the model
output_file("gfg.html")
      
# instantiating the figure object
graph = figure(title = "Bokeh Dot Graph")
    
# the points to be plotted
x = [-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5]
y = [i ** 2 for i in x]
   
# plotting the graph
graph.dot(x, y, size = 25)
    
# displaying the model
show(graph)

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Output :

Example 2 :In this example we will generate the points using the random() function and pass some parameters.

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# importing the modules
from bokeh.plotting import figure, output_file, show
import random
     
# file to save the model
output_file("gfg.html")
     
# instantiating the figure object
graph = figure(title = "Bokeh Dot Graph")
   
# name of the x-axis
graph.xaxis.axis_label = "x-axis"
    
# name of the y-axis
graph.yaxis.axis_label = "y-axis"
   
# generating the points to be plotted
x = []
y = []
for i in range(100):
    x.append(i)
for i in range(100):
    y.append(random.random())
   
# size of the points
size = [i * 40 for i in y]
   
# fill color value
fill_color = "yellow"
  
# name of the legend
legend_label = "Sample Dots"
    
# plotting the graph
graph.dot(x, y,
      size = size,
      fill_color = fill_color,
      legend_label = legend_label)
     
# displaying the model
show(graph)

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Output :




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