Zusammenfassung
Item provides access to item level information for a UniqueValueRenderer.
Diskussion
The Item class allows you to change properties such as label and description and also provides access to the individual Symbol for each item.
Eigenschaften
| Eigenschaft | Erläuterung | Datentyp |
| description (Lesen und schreiben) | Gets and sets the description for the item. | String |
| label (Lesen und schreiben) | Gets and sets the label for the item. | String |
| symbol (Lesen und schreiben) | Gets and sets the symbol associated with the item. | Symbol |
| values (Schreibgeschützt) | Gets the list of values associated with each item. There are multiple values when items are grouped within a group. | List |
Codebeispiel
The following script first changes the renderer to aUniqueValueRenderer. Next, it sets the fields property to use a single field called Percent. It next iterates through each Item in each ItemGroup and sets the RGB color to red and the alpha, or opacity, value to match the Percent value of each feature. Finally, it labels each value, sets the symbology back to the layer and saves the output.
import arcpy, os, sys
relpath = os.path.dirname(sys.argv[0])
p = arcpy.mp.ArcGISProject(relpath + r'\\UniqueValue.aprx')
m = p.listMaps('Map')[0]
l = m.listLayers('PercentCover*')[0]
sym = l.symbology
sym.updateRenderer('UniqueValueRenderer')
sym.renderer.fields = ['Percent']
for grp in sym.renderer.groups:
for itm in grp.items:
transVal = itm.values[0][0] #Grab the first "percent" value in the list of potential values
itm.symbol.color = {'RGB': [255, 0, 0, int(transVal)]}
itm.label = str(transVal) + '%'
l.symbology = sym
p.saveACopy(relpath + r'\\SavedOutput.aprx')