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Treemap using graph_objects class in plotly
  • Last Updated : 30 Aug, 2020

Plotly is a Python library which is used to design graphs, especially interactive graphs. It can plot various graphs and charts like histogram, barplot, boxplot, spreadplot and many more. It is mainly used in data analysis as well as financial analysis. plotly is an interactive visualization library.

Treemap using graph_objects class

Treemapping is a data visualization procedure which can be used to demonstrate graded data using enclosed rectangles. Data is organized as branches and sub_branches by representing using rectangles, dimensions and plot color.Tree map chart helps in distinguishing the categories between data values apparently.

Syntax: class plotly.graph_objects.Treemap(arg=None, branchvalues=None, count=None, customdata=None, hoverinfo=None, **kwargs)

Parameters:

arg: dict of properties compatible with this constructor or an instance of plotly.graph_objects.Treemap



branchvalues: Determines how the items in values are summed.

count:  Determines default for values when it is not provided, by inferring a 1 for each of the “leaves” and/or “branches”, otherwise 0.

customdata:  Assigns extra data each datum. This may be useful when listening to hover, click and selection events. Note that, “scatter” traces also appends customdata items in the markers DOM elements

hoverinfo: Determines which trace information appear on hover. If none or skip are set, no information is displayed upon hovering. But, if none is set, click and hover events are still fired.

Example:

Python3




import plotly.graph_objects as go
  
fig = go.Figure(go.Treemap(
    labels = ["A", "B", "C", "D", "E"],
    parents = ["", "A", "B", "C", "A"] 
))
  
fig.show()

Output:



Set Color of Treemap Sectors

To change the color sector in treemap there are three different ways:

  • marker.colors
  • colorway
  • colorscale

Example:

Python3




import plotly.graph_objects as go
  
fig = go.Figure(go.Treemap(
    labels = ["A", "B", "C", "D", "E"],
    parents = ["", "A", "B", "C", "A"],
    marker_colors = ["blue", "pink", "red"
                 "royalblue", "lightgray", ]
))
  
fig.show()

Output:

Changing text fontsize

In plotly, the labels can be remain of same size by using uniformtext  layout parameter.The font size are set by minsize attributes, and mode attributes are set for labels cannot fit with the desired fontsize: either hide them or show them with overflow.

Python3




import plotly.graph_objects as go
  
fig = go.Figure(go.Treemap(
    labels = ["A", "B", "C", "D", "E"],
    parents = ["", "A", "B", "C", "A"],
marker_colors = ["blue", "pink"]
))
  
fig.update_layout(uniformtext = dict(minsize = 15,
                                   mode ='hide'))
  
fig.show()

Output:

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