Plotting with glyphs
Usually, a plot consists of geometric shapes either in the form of a line, circle, etc. So, Glyphs are nothing but visual shapes that are drawn to represent the data such as circles, squares, lines, rectangles, etc.
Creating a basic line chart:
The line chart displays the visualization of x and y-axis points movements in the form of a line. To draw a line glyph to the figure, we use the line() method of the figure object.
Syntax:
my_plot.line(a, b, line_width)
Code:
Python
# import the librariesfrom bokeh.plotting import figure, show, output_file# prepare some dataa = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]b = [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]# create a plot using figuremy_plot = figure(title="simple line chart", x_axis_label="X-Axis", y_axis_label="Y-Axis")# adding line graphmy_plot.line(a, b, line_width=3)# display output in fileoutput_file("line.html")# show the resultshow(my_plot) |
Output:
Combining multiple graphs
You can also add multiple graphs with the use of bokeh.plotting interface. To do so, you just need to call the line() function multiple times by passing different data as parameters as shown in the example.
Syntax:
p.line(x1, y2, legend_label, line_color, line_width)
Code:
Python
from bokeh.plotting import figure, showfrom bokeh.io import output_notebook# prepare some datax1 = [1, 3, 4, 5, 6]x2 = [5, 3, 8, 1, 8]y1 = [6, 7, 8, 9, 4]y2 = [3, 4, 5, 6, 7]# create a new plotp = figure(title="Drawing multiple lines", x_axis_label="X-Axis", y_axis_label="Y-Axis")# add multiple renderersp.line(x1, y1, legend_label="line 1", line_color="red", line_width=1)p.line(x2, y2, legend_label="line 2", line_color="blue", line_width=1)p.line(x1, y2, legend_label="line 3", line_color="black", line_width=1)output_notebook()show(p) |
Output:
Glyphs in Bokeh
Bokeh is a library of Python which is used to create interactive data visualizations. In this article, we will discuss glyphs in Bokeh. But at first let’s see how to install Bokeh in Python.