Bar

Résumé

Bar charts summarize and compare categorical data by using proportional bar lengths to represent values.

Learn more about bar 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 sample section for an example of how to specify arguments using keywords.

Syntaxe

Bar (x, {y}, {aggregation}, {splitCategory}, {multiSeriesDisplay}, {showMovingAverage}, {movingAveragePeriod}, {rotated}, {title}, {description}, {xTitle}, {yTitle}, {dataSource}, {displaySize})

Paramètre	Explication	Type de données
x	The field name for the x-axis variable. The field must be a category or a date field.	String
y	The field names for the numeric fields. Specify a single field name or a list of field names.	String
aggregation	The statistical calculation applied to values that occur at the same value along the x-axis. Supported statistics are COUNT, SUM, MEAN, MEDIAN, MIN, and MAX. No aggregation means that each value will be plotted on the chart regardless of overlap or recurring values.	String
splitCategory	A second categorical field that adds a separate series or bar for each unique value in the field.	String
multiSeriesDisplay	The display type for a bar chart with multiple series. Valid options are sideBySide, stacked, and stacked100.	String
showMovingAverage	Indicates whether the moving average is displayed for temporal bar charts. (La valeur par défaut est False)	Boolean
movingAveragePeriod	The size of the moving average period.	Integer
rotated	Indicates whether bars are viewed vertically or horizontally. Bars display vertically by default. True rotates bars horizontally. False displays bars vertically. (La valeur par défaut est False)	Boolean
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
xTitle	Sets the title for the x-axis of the chart.	String
yTitle	Sets the title for the y-axis of the chart.	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

Propriétés

Propriété	Explication	Type de données
aggregation (Lecture et écriture)	The statistical calculation applied to values that occur at the same value along the x-axis. Supported statistics are COUNT, SUM, MEAN, MEDIAN, MIN, and MAX. No aggregation means that each value will be plotted on the chart regardless of overlap or recurring values.	String
dataSource (Lecture et écriture)	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 (Lecture et écriture)	Sets the description of the chart. The description text appears at the bottom of the chart view.	String
displaySize (Lecture et écriture)	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
legend (Lecture et écriture)	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
movingAveragePeriod (Lecture et écriture)	The size of the moving average period.	Integer
multiSeriesDisplay (Lecture et écriture)	The display type for a bar chart with multiple series. Valid options are sideBySide, stacked, and stacked100.	Boolean
rotated (Lecture et écriture)	Indicates whether the chart is viewed vertically or horizontally. The chart displays vertically by default. True rotates the chart horizontally. False displays the chart vertically.	Boolean
showMovingAverage (Lecture et écriture)	Indicates whether the moving average is displayed for temporal bar charts.	Boolean
splitCategory (Lecture et écriture)	A second categorical field that adds a separate series or bar for each unique value in the field.	String
title (Lecture et écriture)	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 .	String
type (Lecture seule)	The string value indicating the chart type.	String
x (Lecture et écriture)	The field name for the x-axis variable. The field must be a category or a date field.	String
xAxis (Lecture et écriture)	Sets the properties of the x-axis. field—The field name for the x-axis variable. The field must be a category or a date field. logarithmic—This property is not supported for the Bar class. maximum—The maximum axis bound. minimum—The minimum axis bound. sort—The sorting method applied to this axis. ASC for ascending sorting and DESC for descending sorting. title—The label of the axis that displays on the chart.	Object
y (Lecture et écriture)	The field name or names for the numeric field or fields. Must specify a single field name or a list of field names.	String
yAxis (Lecture et écriture)	Sets the properties of the y-axis. field—The field name or names for the numeric field or fields. Must specify a single field name or a list of field names. logarithmic—This property is not supported for the Bar class. maximum—The maximum axis bound. minimum—The minimum axis bound. sort—The sorting method applied to this axis. ASC is for ascending sorting and DESC is for descending sorting. title—The label of the axis that displays on the chart.	Object

Vue d’ensemble des méthodes

Méthode	Explication
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.

Méthodes

addToLayer (layer_or_layerfile)

Paramètre	Explication	Type de données
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)

Paramètre	Explication	Type de données
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()

Exemple de code

Create a bar chart using a feature service and export the chart to an .svg file.

import arcpy
url = r"https://services1.arcgis.com/hLJbHVT9ZrDIzK0I/arcgis/rest/services/CrimesChiTheft/FeatureServer/0"
bar = arcpy.charts.Bar(x="BEAT", aggregation="count", title="Chicago Thefts by Beat", dataSource=url)
bar.exportToSVG('bar.svg', width=800, height=500)