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:
