Zusammenfassung
The GraduatedColorsRenderer class represents the graduated color renderer definition that shows qualitative differences in feature values using a range of color.
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 accordingly.
Eigenschaften
| Eigenschaft | Erläuterung | Datentyp |
| 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 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 classificationMethod is set to DefinedInterval. | Double |
| lowerBound (Lesen und schreiben) | A double that represents the minimum value of the symbolized classificationField to be displayed. Hinweis:The value of the lowerBound should only be set to a value within the range of the first class break, otherwise it will fail. The maximum value gets modified in the last class break by changing the upperBound property. | 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 gradColors.renderer.nomalizationType = "<None>".
| String |
| type (Schreibgeschützt) | Returns a string that represents the renderer type. | String |
Codebeispiel
The following script first tests if the layer's symbology supports a renderer property and then confirms if the renderer is a SimpleSymbolRenderer. Next is changes the renderer to aGraduatedColorsRenderer and it changes the classificationField and breakCount. Finally, it changes ColorRamp to a color ramp named Cyan to Purple.
import arcpy, os, sys
relpath = os.path.dirname(sys.argv[0])
p = arcpy.mp.ArcGISProject(relpath + r'\\GraduatedColors.aprx')
m = p.listMaps('Layers')[0]
l = m.listLayers('State*')[0]
sym = l.symbology
if hasattr(sym, 'renderer'):
if sym.renderer.type == 'SimpleRenderer':
sym.updateRenderer('GraduatedColorsRenderer')
sym.renderer.classificationField = 'Shape_Area'
sym.renderer.breakCount = 10
sym.renderer.colorRamp = p.listColorRamps('Cyan to Purple')[0]
l.symbology = sym
p.saveACopy(relpath + r'\\SavedOutput.aprx')The following script modifies the symbology of a polygon layer that uses a graduate color renderer. It sets the classificationField and breakCount and iterates through each class break and modifies the upperBound, label, description, and symbol properties such as color, outlineColor, and size. The labels for each break are formatted to include thousands separators. The fill color graduates from red to blue, and the outline color goes from blue to red and increases in size with each break.
# -*- coding: utf-8 -*-
import arcpy, os, sys, locale
relpath = os.path.dirname(sys.argv[0])
p = arcpy.mp.ArcGISProject(relpath + r"\\GraduatedColors.aprx")
m = p.listMaps("Layers")[0]
l = m.listLayers("Natural*")[0]
sym = l.symbology
sym.renderer.classificationField = "Shape_Area"
sym.renderer.breakCount = 7
breakVal = 100000000000
cv = 0
lw = 1
for brk in sym.renderer.classBreaks:
brk.upperBound = breakVal
brk.label = "\u2264" + str(locale.format("%d", breakVal, grouping=True))
brk.description = "Description " + str(cv)
brk.symbol.color = {'HSV' : [cv, 100, 100, 100]}
brk.symbol.outlineColor = {'HSV' : [240-cv, 100, 100, 100]}
brk.symbol.size = lw
breakVal +=100000000000
cv += 40
lw += 0.5
l.symbology = sym
p.saveACopy(relpath + r'\\SavedOutput.aprx')The following script modifies the lowerBound and upperBound property values for the renderer's symbolized classificationField. It also uses Python CIM access to display the out of range classificationField values using a default symbol that is automatically generated.
p = arcpy.mp.ArcGISProject('current')
m = p.listMaps('LowerBoundResult')[0]
l = m.listLayers()[0]
if hasattr(l.symbology, 'renderer'):
if l.symbology.renderer.type == 'GraduatedColorsRenderer':
sym = l.symbology
#Set lowerBound set on Renderer
sym.renderer.lowerBound = 5
#Set upperBound set on upper ClassBreak
sym.renderer.classBreaks[-1].upperBound = 96
l.symbology = sym
#Show values out of range using Python CIM Access
l_cim = l.getDefinition('V3')
l_cim.renderer.useDefaultSymbol = True
l_cim.renderer.defaultLabel = "Out of range"
l.setDefinition(l_cim)