แผนภูมิโดนัท (หรือที่เรียกว่าแผนภูมิโดนัท) เป็นรูปแบบหนึ่งของแผนภูมิวงกลม ยกเว้นว่ามีรูกลมอยู่ตรงกลางซึ่งทำให้ดูเหมือนโดนัท จึงเป็นที่มาของชื่อ พื้นที่ว่างนี้สามารถใช้เพื่อแสดงข้อมูลเพิ่มเติมได้
ตัวอย่าง
# import xlsxwriter module
import xlsxwriter
# Workbook() takes one, non-optional, argument which is the filename #that we want to create.
workbook = xlsxwriter.Workbook('chart_doughnut1.xlsx')
# The workbook object is then used to add new worksheet via the #add_worksheet() method.
worksheet = workbook.add_worksheet()
# Create a new Format object to formats cells in worksheets using
# add_format() method .
# here we create bold format object .
bold = workbook.add_format({'bold': 1})
# Add the worksheet data that the charts will refer to.
headings = ['Category', 'Values']
data = [
['Glazed', 'Chocolate', 'Cream'],
[50, 35, 15],
]
# Write a row of data starting from 'A1' with bold format .
worksheet.write_row('A1', headings, bold)
# Write a column of data starting from 'A2', 'B2' respectively .
worksheet.write_column('A2', data[0])
worksheet.write_column('B2', data[1])
# Create a chart object that can be added to a worksheet using #add_chart() method.
# here we create a doughnut chart object .
chart1 = workbook.add_chart({'type': 'doughnut'})
# Add a data series to a chart using add_series method.
# Configure the first series.syntax to define ranges
# [sheetname, first_row, first_col, last_row, last_col].
chart1.add_series({
'name': 'Doughnut sales data',
'categories': ['Sheet1', 1, 0, 3, 0],
'values': ['Sheet1', 1, 1, 3, 1],
})
# Add a chart title
chart1.set_title({'name': 'Popular Doughnut Types'})
# Set an Excel chart style. Colors with white outline and shadow.
chart1.set_style(10)
# add chart to the worksheet with an offset,at the top-left corner #of a chart is anchored to cell C2.
worksheet.insert_chart('C2', chart1, {'x_offset': 25, 'y_offset': 10})
# Finally, close the Excel file via the close() method.
workbook.close() 