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Python Bokeh - Plotting a Line Graph

Last Updated : 03 Jul, 2020

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

. Plotting a line graph can be done using the

method of the

module.

Syntax : line(parameters) Parameters :

• x : x-coordinates of the points to be plotted
• y : y-coordinates of the points to be plotted
• 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 this 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

In this example we will be using the default values for plotting the graph.

# 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 Line Graph")

# the points to be plotted
x = [1, 2, 3, 4, 5]
y = [1, 6, 8, 2, 3]
 
# plotting the line graph
graph.line(x, y)
 
# displaying the model
show(graph)

In this example we will be plotting a line graph with dotted lines alongside other parameters.

# 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 Line Graph")

# name of the x-axis
graph.xaxis.axis_label = "x-axis"

# name of the y-axis
graph.yaxis.axis_label = "y-axis"

# the points to be plotted
x = [1, 2, 3, 4, 5]
y = [5, 2, 1, 7, 1]

# color of the line
line_color = "red"

# type of line
line_dash = "dotted"

# offset of line dash
line_dash_offset = 1

# name of the legend
legend_label = "Sample Line"

# plotting the line graph for AAPL
graph.line(x, y,
           line_color = line_color,
           line_dash = line_dash,
           line_dash_offset = line_dash_offset,
           legend_label = legend_label)
 
# displaying the model
show(graph)

Now we will see how to plot multiple lines in the same graph. We will generate the points using the

function.

# 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 Line Graph")

# name of the x-axis
graph.xaxis.axis_label = "x-axis"

# name of the y-axis
graph.yaxis.axis_label = "y-axis"

# plotting line 1
# generating the points to be plotted
x = []
y = []
for i in range(100):
    x.append(i)
for i in range(100):
    y.append(1 + random.random())

# parameters of line 1
line_color = "red"
line_dash = "solid"
legend_label = "Line 1"

# plotting the line
graph.line(x, y,
           line_color = line_color,
           line_dash = line_dash,
           legend_label = legend_label)

# plotting line 2
# 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())

# parameters of line 2
line_color = "green"
line_dash = "dotdash"
line_dash_offset = 1
legend_label = "Line 2"

# plotting the line
graph.line(x, y,
           line_color = line_color,
           line_dash = line_dash,
           line_dash_offset = line_dash_offset,
           legend_label = legend_label)
 
# displaying the model
show(graph)

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