Python Bokeh – Plotting Wedges 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 wedges on a graph. Plotting wedges on a graph can be done using the wedge() method of the plotting module.

plotting.figure.wedge()

Syntax : wedge(parameters)

Parameters :

• x : x-coordinates of the wedge markers
• y : y-coordinates of the wedge markers
• radius : radius of the wedge markers
• radius_units : unit of the radius of the wedge markers, default is radian
• start_angle : angle to start the wedge markers
• start_angle_units : unit of the angle to start the wedge markers, default is radian
• end_angle : angle to end the wedge markers
• end_angle_units : unit of the angle to end the wedge markers
• direction : direction of strokes, default is anticlock

Returns : an object of class GlyphRenderer

Example 1 : 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 Wedge Graph")

# the points to be plotted
x = 0
y = 0

# radius of the wedge
radius = 15

# start angle of the wedge
start_angle = 1

# end angle of the wedge
end_angle = 2

# plotting the graph
graph.wedge(x, y,
            radius = radius,
            start_angle = start_angle,
            end_angle = end_angle)

# displaying the model
show(graph)

Output :

Example 2 : In this example we will be plotting multiple wedges with various 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 Wedge 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 = [0, 5, 0]
y = [0, 5, 5]

# radius of the wedges
radius = [15, 10, 5]

# start angle of the wedges
start_angle = [1, 2, 3]

# end angle of the wedges
end_angle = [2, 4, 6]

# color value of the wedges
color = ["yellow", "red", "purple"]

# fill alpha value of the wedges
fill_alpha = [0.9, 0.7, 0.5]

# plotting the graph
graph.wedge(x, y,
            radius = radius,
            start_angle = start_angle,
            end_angle = end_angle,
            color = color,
            fill_alpha = fill_alpha)

# displaying the model
show(graph)

Output :