Pie

Zusammenfassung

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

Learn more about pie charts in ArcGIS Pro

Diskussion

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 sample section for an example of how to specify arguments using keywords.

Syntax

Pie ({categoryField}, {numberFields}, {groupingPercent}, {donutSize}, {sort}, {showDataLabels}, {dataLabelsDisplay}, {title}, {description}, {dataSource}, {displaySize})
ParameterErläuterungDatentyp
categoryField

The field name for the category variable.

String
numberFields

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

String
groupingPercent

The percentage threshold for grouping smaller slices into a single Other category. Expects 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. Expects 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

The sorting method applied to the chart. Valid options are LABEL_CLOCKWISE, LABEL_COUNTERCLOCKWISE, VALUE_CLOCKWISE, and VALUE_COUNTERCLOCKWISE.

String
showDataLabels

Indicates whether data labels are displayed. True displays data labels, and False hides data labels.

Boolean
dataLabelsDisplay

The format of the data labels. Valid options are VALUE, PERCENTAGE, and PERCENTAGE_AND_VALUE.

String
title

Sets 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

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

String
dataSource

Sets the data source of the chart. When a chart is exported using the exportToSVG method or displayed in an ArcGIS Notebook, the data source is read and rendered on the chart. Valid data sources include paths to datasets, including local datasets, UNC paths, and service URLs, and arcpy.mp Layer objects.

Object
displaySize
[displaySize,...]

Sets 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, where the first item is the width of the chart and the second item is the height of the chart.

List

Eigenschaften

EigenschaftErläuterungDatentyp
categoryField
(Lesen und schreiben)

The field name for the category variable.

String
dataLabelsDisplay
(Lesen und schreiben)

The format of the data labels. Valid options are VALUE, PERCENTAGE, and PERCENTAGE_AND_VALUE.

String
dataSource
(Lesen und schreiben)

Sets the data source of the chart. When a chart is exported using the exportToSVG method or displayed in an ArcGIS Notebook, the data source is read and rendered on the chart. Valid data sources include paths to datasets, including local datasets, UNC paths, and service URLs, and arcpy.mp Layer objects.

Object
description
(Lesen und schreiben)

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

String
displaySize
(Lesen und schreiben)

Sets 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, where the first item is the width of the chart and the second item is the height of the chart.

List
donutSize
(Lesen und schreiben)

The size of the hole when displaying a pie chart as a donut. Expects 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
(Lesen und schreiben)

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

Integer
legend
(Lesen und schreiben)

Sets the properties of the chart legend.

  • visible—Indicates whether the legend is visible in the chart view. True displays the legend. False hides the legend.
  • title—The title to display for the legend.
Object
numberFields
(Lesen und schreiben)

The field name or names for the numeric field or fields. This property must specify a single field name or a list of field names.

String
showDataLabels
(Lesen und schreiben)

Indicates whether data labels are displayed. True displays data labels, and False hides data labels.

Boolean
sort
(Lesen und schreiben)

The sorting method applied to the chart. Valid options are LABEL_CLOCKWISE, LABEL_COUNTERCLOCKWISE, VALUE_CLOCKWISE, and VALUE_COUNTERCLOCKWISE.

String
title
(Lesen und schreiben)

Sets 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 Nach Darstellungsreihenfolge auflisten.

String
type
(Schreibgeschützt)

The string value indicating the chart type.

String

Methodenübersicht

MethodeErläuterung
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.

Methoden

addToLayer (layer_or_layerfile)
ParameterErläuterungDatentyp
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)
ParameterErläuterungDatentyp
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()

Codebeispiel

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)