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Pie

In this topic

  1. Summary
  2. Discussion
  3. Syntax
  4. Properties
  5. Method Overview
  6. Methods
  7. Code sample

Summary

Pie charts group data into slices to visualize part-to-whole relationships.

Learn more about pie charts in ArcGIS Pro

Discussion

When creating a chart object, optional arguments for the class constructor must be specified using the argument name; they cannot be specified by argument position. See the Code Samples section for an example of how to specify arguments using keywords.

Syntax

Pie ({categoryField}, {numberFields}, {splitCategory}, {miniChartsPerRow}, {showPreviewChart}, {groupingPercent}, {donutSize}, {sort}, {showDataLabels}, {dataLabelsDisplay}, {title}, {description}, {dataSource}, {displaySize})
ParameterExplanationData Type
categoryField

The field name of the category variable.

String
numberFields

The field names for the numeric field or fields. Provide a single field name or a list of field names.

String
splitCategory

A categorical field that adds a separate series for each unique value in the field.

String
miniChartsPerRow

The number of minicharts that will be shown per row. The number of rows will be determined by the total number of series divided by the miniChartsPerRow value.

Integer
showPreviewChart

Specifies whether the preview chart will be displayed for grid charts.

  • True—The preview chart will be displayed.
  • False—The preview chart will not be displayed.

(The default value is False)

Boolean
groupingPercent

The percentage threshold for grouping smaller slices into a single Other category. Provide an integer between 0 and 100 that represents the maximum percentage value for determining which slices are grouped into the Other category.

Integer
donutSize

The size of the hole when displaying a pie chart as a donut. Provide an integer between 0 and 100 that represents the size of the hole as a percentage relative to the total size of the pie.

Integer
sort

Specifies the sort order for the slices in the chart.

  • LABEL_CLOCKWISE—Slices will be displayed in clockwise alphabetical order, starting at the top center of chart.
  • LABEL_COUNTERCLOCKWISE—Slices will be displayed in counterclockwise alphabetical order, starting at the top center of chart.
  • VALUE_CLOCKWISE—Slices will be displayed in clockwise order by value, starting at the top center of chart.
  • COUNTERCLOCKWISE—Slices will be displayed in counterclockwise order by value, starting at the top center of chart.
String
showDataLabels

Specifies whether data labels will be displayed.

  • True—Data labels will be displayed.
  • False—Data labels will not be displayed.
Boolean
dataLabelsDisplay

Specifies the format that will be used for the data labels.

  • VALUE—Raw number values will be displayed.
  • PERCENTAGE—percentage values will be displayed.
  • PERCENTAGE_AND_VALUE—Both raw number and percentage values will be displayed.
String
title

The title of the chart. The title text appears at the top of the chart view and is used as the label for the chart in the Contents pane.

String
description

The description of the chart. The description text appears at the bottom of the chart view.

String
dataSource

The data source of the chart. When a chart is exported using the exportToSVG method or displayed in an ArcGIS Notebook, the data source will be read and rendered on the chart. Valid data sources include the following:

  • Paths to datasets, including local datasets, UNC paths, and service URLs
  • Arrow table objects
  • Layer objects

Object
displaySize
[displaySize,...]

The size of the chart when exported using the exportToSVG method or displayed in an ArcGIS Notebook. The value must be specified as a two-item list in which the first item is the width of the chart and the second item is the height of the chart.

List

Properties

PropertyExplanationData Type
categoryField
(Read and Write)

The field name of the category variable.

String
dataLabelsDisplay
(Read and Write)

Specifies the format that will be used for the data labels.

  • VALUE—Raw number values will be displayed.
  • PERCENTAGE—Percentage values will be displayed.
  • PERCENTAGE_AND_VALUE—Both raw number and percentage values will be displayed.
String
dataSource
(Read and Write)

The data source of the chart. When a chart is exported using the exportToSVG method or displayed in an ArcGIS Notebook, the data source will be read and rendered on the chart. Valid data sources include the following:

  • Paths to datasets, including local datasets, UNC paths, and service URLs
  • Arrow table objects
  • Layer objects.

Object
description
(Read and Write)

The description of the chart. The description text appears at the bottom of the chart view.

String
displaySize
(Read and Write)

The size of the chart when exported using the exportToSVG method or displayed in an ArcGIS Notebook. The value must be specified as a two-item list in which the first item is the width of the chart and the second item is the height of the chart.

List
donutSize
(Read and Write)

The size of the hole when displaying a pie chart as a donut. Provide an integer between 0 and 100 that represents the size of the hole as a percentage relative to the total size of the pie.

Integer
groupingPercent
(Read and Write)

The percentage threshold for grouping smaller slices into a single Other category. Provide an integer between 0 and 100 that represents the maximum percentage value for determining which slices are grouped into the Other category.

Integer
legend
(Read and Write)

The properties of the chart legend.

  • visible—Specifies whether the legend will be displayed in the chart view. True displays the legend, and False hides the legend.
  • title—The title of the legend.
Object
miniChartsPerRow
(Read and Write)

The number of minicharts that will be shown per row. The number of rows will be determined by the total number of series divided by the miniChartsPerRow value.

Integer
numberFields
(Read and Write)

The field name or names for the numeric field or fields. Provide a single field name or a list of field names.

String
showDataLabels
(Read and Write)

Specifies whether data labels will be displayed.

  • True—Data labels will be displayed.
  • False—Data labels will not be displayed.
Boolean
showPreviewChart
(Read and Write)

Specifies whether the preview chart will be displayed for grid charts.

  • True—The preview chart will be displayed.
  • False—The preview chart will not be displayed.
Boolean
sort
(Read and Write)

Specifies the sort order for the slices in the chart.

  • LABEL_CLOCKWISE—Slices will be displayed in clockwise alphabetical order, starting at the top center of chart.
  • LABEL_COUNTERCLOCKWISE—Slices will be displayed in counterclockwise alphabetical order, starting at the top center of chart.
  • VALUE_CLOCKWISE—Slices will be displayed in clockwise order by value, starting at the top center of chart.
  • COUNTERCLOCKWISE—Slices will be displayed in counterclockwise order by value, starting at the top center of chart.
String
splitCategory
(Read and Write)

A categorical field that adds a separate series for each unique value in the field.

String
theme
(Read and Write)

Specifies the name of the theme that is applied to the chart.

String
title
(Read and Write)

The title of the chart. The title text appears at the top of the chart view and is used as the label in the Contents pane on the List By Drawing Order tab List By Drawing Order.

String
type
(Read Only)

The string value indicating the chart type.

String

Method Overview

MethodExplanation
addToLayer (layer_or_layerfile)

Adds the chart object to a layer or stand-alone table.

exportToSVG (path, width, height)

Exports the chart to SVG format.

updateChart ()

Updates chart properties to sync changes between the object and the chart previously added to a layer.

Methods

addToLayer (layer_or_layerfile)
ParameterExplanationData Type
layer_or_layerfile

The chart will be added to the target object. The layer_or_layerfile argument can be a Layer or a Table object.

Object

Often the final step after defining chart properties is to add the chart object to a layer or table using the addToLayer method.

Add a chart to an existing layer.

import arcpy

aprx = arcpy.mp.ArcGISProject("current")
map = aprx.listMaps()[0]
censusLayer = map.listLayers('Census Block Groups')[0]

# Add chart object to a layer
chart.addToLayer(censusLayer)
exportToSVG (path, width, height)
ParameterExplanationData Type
path

The path where the chart will be exported in SVG format.

String
width

The width of the output graphic.

Integer
height

The height of the output graphic.

Integer

In some cases, you may want to save the chart as a graphic that can be shared and viewed outside of ArcGIS Pro. Exporting to the SVG graphic format is beneficial, as the chart elements and text are stored as vector elements that can be independently modified in a vector graphics software. An SVG graphic can also be resized to any scale without pixelation or loss in quality.

Export a chart that has a project layer data source to an .svg file.

import arcpy

aprx = arcpy.mp.ArcGISProject('current')
censusLayer = aprx.listMaps()[0].listLayers('Census Block Groups')[0]

# Set data source of chart object to a layer within current project
chart.dataSource = censusLayer

# Save the chart to file with dimensions width=500, height=500
chart.exportToSVG('populationByState.svg', 500, 500)

Export a chart that has a feature service data source to an .svg file.


featureServiceURL = r'https://services1.arcgis.com/hLJbHVT9ZrDIzK0I/arcgis/rest/services/CrimesChiTheft/FeatureServer/0'

# Set data source of chart object to a feature service URL
chart.dataSource = featureServiceURL

# Save the chart to file with dimensions width=800, height=600
chart.exportToSVG('theftsPerBeat.svg', 800, 600)
updateChart ()

Often the final step after defining chart properties is to add the chart object to a layer using the addToLayer method.

To further modify the chart properties, you can modify the properties of the original chart instead of starting from scratch with a new chart. You can then use the updateChart method to synchronize any changes into the chart that was added to the layer. This will allow the changes you make to be presented in the Chart properties pane and chart view.

Use the updateChart method to synchronize chart property changes into a layer.


chart.addToLayer(myLayer)

# Further modification is necessary
chart.description = "Data from the U.S. Census Bureau"
chart.updateChart()

Code sample

Create a pie chart from a layer and export the chart to an .svg file.


import arcpy
lyr = arcpy.mp.ArcGISProject("current").activeMap.listLayers("nyc_noise_complaints")[0]
pie = arcpy.charts.Pie(categoryField="Complaint_Type", title="Noise Complaints by Type", dataSource=lyr)
pie.exportToSVG('pie.svg', width=1000, height=800)

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In this topic
  1. Summary
  2. Discussion
  3. Syntax
  4. Properties
  5. Method Overview
  6. Methods
  7. Code sample