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 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})

Parameter	Erläuterung	Datentyp
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. (Der Standardwert ist 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

Eigenschaften

Eigenschaft	Erläuterung	Datentyp
categoryField (Lesen und schreiben)	The field name of the category variable.	String
dataLabelsDisplay (Lesen und schreiben)	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 (Lesen und schreiben)	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 (Lesen und schreiben)	The description of the chart. The description text appears at the bottom of the chart view.	String
displaySize (Lesen und schreiben)	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 (Lesen und schreiben)	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 (Lesen und schreiben)	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 (Lesen und schreiben)	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 (Lesen und schreiben)	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 (Lesen und schreiben)	The field name or names for the numeric field or fields. Provide a single field name or a list of field names.	String
showDataLabels (Lesen und schreiben)	Specifies whether data labels will be displayed. True—Data labels will be displayed. False—Data labels will not be displayed.	Boolean
showPreviewChart (Lesen und schreiben)	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 (Lesen und schreiben)	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 (Lesen und schreiben)	A categorical field that adds a separate series for each unique value in the field.	String
theme (Lesen und schreiben)	Specifies the name of the theme that is applied to the chart.	String
title (Lesen und schreiben)	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 .	String
type (Schreibgeschützt)	The string value indicating the chart type.	String

Methodenübersicht

Methode	Erläuterung
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)

Parameter	Erläuterung	Datentyp
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)

Parameter	Erläuterung	Datentyp
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)