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Python Bokeh - Plotting Inverted Triangles on a Graph

Last Updated : 10 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 plot inverted triangles on a graph. Plotting inverted triangles on a graph can be done using the

method of the

module.

Syntax : inverted_triangle(parameters) Parameters :

• x : x-coordinates of the center of the inverted triangle markers
• y : y-coordinates of the center of the inverted triangle markers
• size : diameter of the inverted triangle markers, default is 4
• angle : angle of rotation of the inverted triangle markers, default is 0
• angle_units : unit of the angle, default is rad
• fill_alpha : fill alpha value of the inverted triangle markers
• fill_color : fill color value of the inverted triangle 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

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 Inverted Triangle 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.inverted_triangle(x, y) 
   
# displaying the model 
show(graph) 

In this example we will be plotting the inverted triangles where the sizes are in proportion to their values and 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 Inverted Triangle 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 = [-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5] 
y = [i ** 2 for i in x] 
   
# size of the diamonds 
size = [i * 2 for i in y] 
   
# angle of the diamonds 
angle = 10
  
# fill color value 
fill_color = "yellow"
  
# color of the line 
line_color = "red"
  
# name of the legend 
legend_label = "Sample Triangles"
    
# plotting the graph 
graph.inverted_triangle(x, y,
                        size = size, 
                        angle = angle, 
                        fill_color = fill_color, 
                        line_color = line_color, 
                        legend_label = legend_label) 
     
# displaying the model 
show(graph)

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