October 13, 2024

Python Tutorials

bokeh.plotting.figure.diamond_cross() Function in Python

The diamond_cross() function in Bokeh is a method of the figure class used to create a scatter plot with markers that are diamond-shaped with a cross inside them. This function provides an easy way to customize the appearance of scatter plots. Bokeh is a powerful library for interactive visualization in Python, and diamond_cross() is just one of the many options available for customizing plots.

1. Importing Bokeh

First, you need to install and import Bokeh. If you haven’t installed it yet, you can do so using pip:

pip install bokeh

Then, import the necessary modules:

from bokeh.plotting import figure, show
from bokeh.io import output_notebook

# Display plots in the notebook
output_notebook()

2. Using the diamond_cross() Function

The diamond_cross() function creates a scatter plot with diamond-shaped markers with crosses. It is used to plot data points where each marker is a diamond shape with a cross inside. This can be useful for distinguishing data points in a plot.

2.1 Basic Example

# Create a new figure
p = figure(title="Diamond Cross Markers Example", x_axis_label='X-axis', y_axis_label='Y-axis')

# Add diamond_cross markers
p.diamond_cross(x=[1, 2, 3, 4, 5], y=[6, 7, 2, 4, 5], size=10, color="navy", fill_alpha=0.5)

# Show the plot
show(p)

2.2 Parameters of diamond_cross()

The diamond_cross() function takes several parameters:

  • x: A sequence of x-coordinates for the markers.
  • y: A sequence of y-coordinates for the markers.
  • size: The size of the markers (in pixels).
  • color: The color of the markers. It can be a string or a sequence of colors.
  • fill_alpha: The opacity level of the marker fill. It ranges from 0 (fully transparent) to 1 (fully opaque).

3. Customizing the Plot

You can customize the plot further by adjusting various attributes and adding more features such as titles, labels, and grids. Here’s an example:

# Create a new figure with customized settings
p = figure(title="Customized Diamond Cross Plot", x_axis_label='X-axis', y_axis_label='Y-axis', tools="pan,wheel_zoom,box_zoom,reset")

# Add diamond_cross markers with custom settings
p.diamond_cross(x=[1, 2, 3, 4, 5], y=[6, 7, 2, 4, 5], size=15, color="green", fill_alpha=0.6)

# Customize the grid and axis
p.grid.grid_line_color = "gray"
p.xaxis.axis_label_standoff = 12
p.yaxis.axis_label_standoff = 12

# Show the plot
show(p)

4. Summary

The diamond_cross() function in Bokeh allows you to create scatter plots with diamond-shaped markers featuring a cross inside. It is part of the figure class and provides options to customize the appearance of the markers and the plot. By adjusting parameters such as size, color, and fill opacity, you can create informative and visually appealing plots.

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