仪表盘图将饼图和甜甜圈图组合在一起以创建仪表盘。第一个图表是一个有四个切片的甜甜圈图表。前三片与量具的颜色相对应；第四片是甜甜圈的一半，是隐形的。
将添加包含三个切片的饼图。第一片和第三片是看不见的，这样第二片就可以充当量规上的针。
这些效果是使用数据系列中各个数据点的图形属性实现的。
from openpyxl import Workbook
from openpyxl.chart import PieChart, DoughnutChart, Series, Reference
from openpyxl.chart.series import DataPoint
data = [
["Donut", "Pie"],
[25, 75],
[50, 1],
[25, 124],
[100],
]
# based on http://www.excel-easy.com/examples/gauge-chart.html
wb = Workbook()
ws = wb.active
for row in data:
ws.append(row)
# First chart is a doughnut chart
c1 = DoughnutChart(firstSliceAng=270, holeSize=50)
c1.title = "Code coverage"
c1.legend = None
ref = Reference(ws, min_col=1, min_row=2, max_row=5)
s1 = Series(ref, title_from_data=False)
slices = [DataPoint(idx=i) for i in range(4)]
slices[0].graphicalProperties.solidFill = "FF3300" # red
slices[1].graphicalProperties.solidFill = "FCF305" # yellow
slices[2].graphicalProperties.solidFill = "1FB714" # green
slices[3].graphicalProperties.noFill = True # invisible
s1.data_points = slices
c1.series = [s1]
# Second chart is a pie chart
c2 = PieChart(firstSliceAng=270)
c2.legend = None
ref = Reference(ws, min_col=2, min_row=2, max_col=2, max_row=4)
s2 = Series(ref, title_from_data=False)
slices = [DataPoint(idx=i) for i in range(3)]
slices[0].graphicalProperties.noFill = True # invisible
slices[1].graphicalProperties.solidFill = "000000" # black needle
slices[2].graphicalProperties.noFill = True # invisible
s2.data_points = slices
c2.series = [s2]
c1 += c2 # combine charts
ws.add_chart(c1, "D1")
wb.save("gauge.xlsx")
```
