Bokeh - Specialized Curves

The bokeh.plotting API supports methods for rendering following specialised curves −

beizer()

This method adds a Bzier curve to the figure object. A Bzier curve is a parametric curve used in computer graphics. Other uses include the design of computer fonts and animation, user interface design and for smoothing cursor trajectory.

In vector graphics, Bzier curves are used to model smooth curves that can be scaled indefinitely. A "Path" is combination of linked Bzier curves.

The beizer() method has following parameters which are defined −

Default value for all parameters is None.

Example - Plotting of Bezier Curve (main.py)

Following code generates a HTML page showing a Bzier curve and parabola in Bokeh plot −

from bokeh.plotting import figure, output_file, show

x = 2
y = 4
xp02 = x+0.4
xp01 = x+0.1
xm01 = x-0.1
yp01 = y+0.2
ym01 = y-0.2
fig = figure(width = 300, height = 300)
fig.bezier(x0 = x, y0 = y, x1 = xp02, y1 = y, cx0 = xp01, cy0 = yp01,
cx1 = xm01, cy1 = ym01, line_color = "red", line_width = 2)

show(fig)

Output

Run the code and verify the output in the browser.

(myenv) D:\bokeh\myenv>py main.py

quadratic()

This method adds a parabola glyph to bokeh figure. The function has same parameters as beizer(), except cx0 and cx1.

Example - Plotting of quadratic curve (main.py)

The code given below generates a quadratic curve.

from bokeh.plotting import figure, output_file, show

x = 2
y = 4
xp01 = x + 0.4
yp01 = y + 0.01
cx01 = x + 0.1
cy01 = y + 0.2

fig = figure(width = 300, height = 300)
fig.quadratic(x0 = x, y0 = y, x1 = xp01, y1 = yp01, cx = cx01,
cy = cy01, line_color = "blue", line_width = 3)

show(fig)

Output

Run the code and verify the output in the browser.

(myenv) D:\bokeh\myenv>py main.py