plotly.graph_objects.Contour

Syntax and Parameter List

The function syntax and parameter list are as follows:

Parameters:

1. arg – defines a dictionary with the properties compatible with the constructor
2. x – sets the x coordinate
3. y – sets the y coordinate
4. z – represents the values used for the z coordinate
5. colorbar – sets the dictionary with properties for customizing the figure colorbar

Basic Contour Plot With Plotly graph_objects

The following code illustrates creating a basic contour plot using the Plotly graph_objects module and contour class:

The previous code should return a contour figure as follows:

Setting the Horizontal and Vertical Axis

You can specify the values for the horizontal and vertical axis by setting the x and y coordinates.

An example is shown in the following table:

X values are placed on the horizontal axis while y values are set on the vertical axis as shown in the following figure:

Specifying Colorscale

You can set a custom colorscale by setting the colorscale parameter. For example, the code following sets the colorscale to “Blackbody”:

The output is shown in the following image:

Smooth Contour Coloring

To get a smooth gradient color for the contour lines, you can use the contours_coloring parameter as follows:

The resulting figure is shown in the following figure:

Setting Contour Line Labels

To add labels to the contour lines, we can use the “showlabels” parameter as shown in the following code:

The resulting figure is shown in the following image:

Setting Colorbar Title

You can also add a title to the colorbar using the title parameter shown in the following table:

Output:

Conclusion

This article explored various techniques for creating contour plots using Plotly graph_objects. We discussed setting the horizontal and vertical axis, specifying colorscale, setting contour line labels, and setting the colorbar title. Feel free to check other articles from Linux Hint for more.