Zusammenfassung
The GraduatedSymbolsRenderer class represents the graduated symbols renderer definition that shows qualitative differences in feature values using a range of symbol sizes.
Diskussion
The properties behave in a similar manner to the options exposed in the application. For example, changing the number of classes will automatically adjust the break values and their labels. If you change upperBound of a ClassBreak, the classificationMethod automatically changes to ManualInterval. You also need to manually update the labels and/or descriptions properties accordingly.
Eigenschaften
| Eigenschaft | Erläuterung | Datentyp |
| backgroundSymbol (Lesen und schreiben) | A symbol that represents the background symbol for the features in the layer. It only applies to polygon feature classes. | Symbol |
| breakCount (Lesen und schreiben) | An integer that represents the number of classes to be used with the current classification method. | Integer |
| classBreaks (Lesen und schreiben) | A list of ClassBreak objects that provides access to individual properties such as label and description as well as individual symbol objects. | List |
| classificationField (Lesen und schreiben) | A string that represents a valid field name used for the layer's classification method. | String |
| classificationMethod (Lesen und schreiben) | A string that represents a valid classification method. The valid values are as follows:
| String |
| colorRamp (Lesen und schreiben) | Provides access to the ColorRamp object. | ColorRamp |
| deviationInterval (Lesen und schreiben) | A double that represents a valid deviation interval that is only available if the classificationMethod is set to StandardDeviation. Valid values are 1.0, 0.5, 0.333, and 0.25. These are the same options available in the application. | Double |
| intervalSize (Lesen und schreiben) | A double that represents an interval size that is only available if the classificationMethod is set to DefinedInterval. Valid values are 1.0, 0.5, 0.333, and 0.25. These are the same options available in the application. | Double |
| maximumSymbolSize (Lesen und schreiben) | A double that represents the size of the largest graduated symbol. | Double |
| minimumSymbolSize (Lesen und schreiben) | A double that represents the size of the smallest graduated symbol. | Double |
| normalizationField (Lesen und schreiben) | A string that represents a valid layer field name that is used for normalization. | String |
| normalizationType (Lesen und schreiben) | A specific string that represents a valid normalization key word. For example, to clear the normalization, try gradSymbols.renderer.nomalizationType = "<None>".
| String |
| symbolTemplate (Schreibgeschützt) | Returns a symbol that represents the symbol template for all the features in the layer. To set the template use the updateSymbolTemplate method. | Symbol |
| type (Schreibgeschützt) | Returns a string that represents the renderer type. | String |
Methodenübersicht
| Methode | Erläuterung |
| updateSymbolTemplate (symbol_template) | updateSymbolTemplate provides a mechanism to change the renderer's symbol template. |
Methoden
updateSymbolTemplate (symbol_template)
| Parameter | Erläuterung | Datentyp |
symbol_template | A reference to a symbol. (Der Standardwert ist None) | Object |
The updateSymbolTemplate method allows you to modify the symbol for all the class breaks at once. The symbol template is managed in the application differently than other renderer properties, for example, backgroundSymbol, and therefore requires a method to set the symbol template to the renderer.
Codebeispiel
The following script first tests if the layer's symbology supports a renderer property. It then confirms if the renderer is a GraduatedSymbolsRenderer. Next, it sets up the backgroundSymbol and symbolTemplate. Next, it changes the classificationField and breakCount and also sets the minimum and maximum symbol sizes. Finally, it changes ColorRamp to a color ramp named Black to White.
import arcpy, os, sys
relpath = os.path.dirname(sys.argv[0])
p = arcpy.mp.ArcGISProject(relpath + r"\\GraduatedSymbols.aprx")
m = p.listMaps("Layers")[0]
l = m.listLayers("Natural*")[0]
sym = l.symbology
if hasattr(sym, 'renderer'):
if sym.renderer.type == "GraduatedSymbolsRenderer":
#set background symbol
sym.renderer.backgroundSymbol.applySymbolFromGallery("Extent Transparent Wide Gray")
#set symbol template
symTemp = sym.renderer.symbolTemplate
symTemp.applySymbolFromGallery('Square 1')
sym.renderer.updateSymbolTemplate(symTemp)
#modify graduated symbol renderer
sym.renderer.classificationField = "Shape_Area"
sym.renderer.breakCount = 6
sym.renderer.minimumSymbolSize = 10
sym.renderer.maximumSymbolSize = 25
sym.renderer.colorRamp = p.listColorRamps("Black to White")[0]
l.symbology = sym
p.saveACopy(relpath + r"\\SavedOutput.aprx")