Plotly 中的标题对齐

在本文中，我们将使用plotly模块讨论标题分配和对齐。

为了使用plotly模块在可视化中对齐标题，我们将使用update_layout()方法。

句法：

plotly.graph_objects.Figure.update_layout(title_text, title_x, title_y)

Parameters:

• title: Accepts string value as the title of the visualization.
• title_x: This parameter is used to align the title in a horizontal motion and accepts a value from 0 to 1.
• title_y: This parameter is used to align the title in a vertical motion and accepts a value from 0 to 1.

让我们在以下示例中实现该方法：

示例 1

Python3

# import all required libraries
import numpy as np
import plotly
import plotly.graph_objects as go
import plotly.offline as pyo
from plotly.offline import init_notebook_mode
 
init_notebook_mode(connected=True)
 
# generating 150 random integers
# from 1 to 50
x = np.random.randint(low=1, high=50, size=150)*0.1
 
# generating 150 random integers
# from 1 to 50
y = np.random.randint(low=1, high=50, size=150)*0.1
 
# plotting scatter plot
fig = go.Figure(data=go.Scatter(x=x, y=y, mode='markers'))
 
# title alignment
fig.update_layout(title_text='Dots')
 
fig.show()

输出：

示例 2

蟒蛇3

# import all required libraries
import numpy as np
import plotly
import plotly.graph_objects as go
import plotly.offline as pyo
from plotly.offline import init_notebook_mode
 
init_notebook_mode(connected = True)
 
# different individual parts in
# total chart
countries=['India', 'canada',
        'Australia','Brazil',
        'Mexico','Russia',
        'Germany','Switzerland',
        'Texas']
 
# values corresponding to each
# individual country present in
# countries
values = [4500, 2500, 1053, 500,
        3200, 1500, 1253, 600, 3500]
 
# plotting pie chart
fig = go.Figure(data=[go.Pie(labels=countries,
                    values=values)])
 
# title alignment
fig.update_layout(title_text='Pie',title_y=0.5)
 
fig.show()

输出：

使用title_y=0.5 ，标题应该在中心。

当title_y = 0.1

当title_y = 1

示例 3

蟒蛇3

# import required libraries
import dash
import dash_core_components as dcc
import dash_html_components as html
import plotly.express as px
import pandas as pd
 
external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
 
app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
 
# assume you have a "long-form" data frame
df = pd.DataFrame({
    "Year": ["2015", "2016", "2017", "2015", "2016", "2017"],
    "Revenue": [4, 1, 2, 2, 4, 5],
    "Company": ["ABC Pvt. Ltd.", "ABC Pvt. Ltd.", "ABC Pvt. Ltd.", "XYZ Pvt. Ltd.", "XYZ Pvt. Ltd.", "XYZ Pvt. Ltd."]
})
 
# depict visualization
fig = px.bar(df, x="Year", y="Revenue", color="Company", barmode="group")
 
app.layout = html.Div(children=[
 
    dcc.Graph(
        id='example-graph',
        figure=fig
    )
])
 
# allign title
fig.update_layout(title_text='Revenue', title_x=0.5)
 
if __name__ == '__main__':
    app.run_server(debug=True)

输出：

使用title_x=0.5 ，标题应该在中心。

当title_x = 0.3

当title_x = 1