ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / ColorRampStyleItem Class
Members Example

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    ColorRampStyleItem Class
    In This Topic
    Represents a color ramp saved in a style.
    Object Model
    ColorRampStyleItem ClassCIMColorRamp Class
    Syntax
    public class ColorRampStyleItem : StyleItem, System.ComponentModel.INotifyPropertyChanged  
    Public Class ColorRampStyleItem 
       Inherits StyleItem
       Implements System.ComponentModel.INotifyPropertyChanged 
    Example
    How to search for color ramps in a style
    public async Task<IList<ColorRampStyleItem>> GetColorRampsFromStyleAsync(StyleProjectItem style, string searchString)
    {
      //StyleProjectItem can be "ColorBrewer Schemes (RGB)", "ArcGIS 2D"...
      if (style == null)
        throw new System.ArgumentNullException();
    
      //Search for color ramps
      //Color Ramp searchString can be "Spectral (7 Classes)", "Pastel 1 (3 Classes)", "Red-Gray (10 Classes)"..
      return await QueuedTask.Run(() => style.SearchColorRamps(searchString));
    }
    Create a feature layer with class breaks renderer
    string colorBrewerSchemesName = "ColorBrewer Schemes (RGB)";
    StyleProjectItem style = Project.Current.GetItems<StyleProjectItem>().First(s => s.Name == colorBrewerSchemesName);
    string colorRampName = "Greens (Continuous)";
    IList<ColorRampStyleItem> colorRampList = await QueuedTask.Run(() =>
    {
      return style.SearchColorRamps(colorRampName);
    });
    ColorRampStyleItem colorRamp = colorRampList[0];
    
    await QueuedTask.Run(() =>
    {
      GraduatedColorsRendererDefinition gcDef = new GraduatedColorsRendererDefinition()
      {
        ClassificationField = "CROP_ACR07",
        ClassificationMethod = ArcGIS.Core.CIM.ClassificationMethod.NaturalBreaks,
        BreakCount = 6,
        ColorRamp = colorRamp.ColorRamp,
        SymbolTemplate = SymbolFactory.Instance.ConstructPolygonSymbol(
                                ColorFactory.Instance.GreenRGB, SimpleFillStyle.Solid, null).MakeSymbolReference(),
        ExclusionClause = "CROP_ACR07 = -99",
        ExclusionSymbol = SymbolFactory.Instance.ConstructPolygonSymbol(
                                ColorFactory.Instance.RedRGB, SimpleFillStyle.Solid, null).MakeSymbolReference(),
        ExclusionLabel = "No yield",
      };
      var featureLayerCreationParams = new FeatureLayerCreationParams((new Uri(@"c:\Data\CountyData.gdb\Counties")))
      {
        Name = "Crop",
        RendererDefinition = gcDef
      };
      LayerFactory.Instance.CreateLayer<FeatureLayer>(featureLayerCreationParams, MapView.Active.Map);
    });
    
    Create and Set a Stretch Renderer
    //Must be called on the MCT
    //var pcsl = ...;
    
    //At 2.x - var fields = pcsl.QueryAvailablePointCloudRendererFields(
    //                           PointCloudRendererType.StretchRenderer);
    
    var fields = pcsl.GetAvailablePointCloudRendererFields(
                             PointCloudRendererType.StretchRenderer);
    var stretchDef = new PointCloudRendererDefinition(
                              PointCloudRendererType.StretchRenderer)
    {
      //Will be either ELEVATION or INTENSITY
      Field = fields[0]
    };
    //Create the CIM Renderer
    var stretchRenderer = pcsl.CreateRenderer(stretchDef) 
                                       as CIMPointCloudStretchRenderer;
    //Apply a color ramp
    var style = Project.Current.GetItems<StyleProjectItem>()
                                    .First(s => s.Name == "ArcGIS Colors");
    var colorRamp = style.SearchColorRamps("").First();
    stretchRenderer.ColorRamp = colorRamp.ColorRamp;
    //Apply modulation
    stretchRenderer.ColorModulation = new CIMColorModulationInfo()
    {
      MinValue = 0,
      MaxValue = 100
    };
    //apply the renderer
    pcsl.SetRenderer(stretchRenderer);
    
    Create and Set a ClassBreaks Renderer
    //Must be called on the MCT
    //var pcsl = ...;
    
    //At 2.x - var fields = pcsl.QueryAvailablePointCloudRendererFields(
    //                          PointCloudRendererType.ClassBreaksRenderer);
    
    var fields = pcsl.GetAvailablePointCloudRendererFields(
                         PointCloudRendererType.ClassBreaksRenderer);
    var classBreakDef = new PointCloudRendererDefinition(
                              PointCloudRendererType.ClassBreaksRenderer)
    {
      //ELEVATION or INTENSITY
      Field = fields[0]
    };
    //create the renderer
    var cbr = pcsl.CreateRenderer(classBreakDef) 
                              as CIMPointCloudClassBreaksRenderer;
    //Set up a color scheme to use
    var style = Project.Current.GetItems<StyleProjectItem>()
                               .First(s => s.Name == "ArcGIS Colors");
    var rampStyle = style.LookupItem(
      StyleItemType.ColorRamp, "Spectrum By Wavelength-Full Bright_Multi-hue_2")
                                                                as ColorRampStyleItem;
    var colorScheme = rampStyle.ColorRamp;
    //Set up 6 manual class breaks
    var breaks = 6;
    var colors = ColorFactory.Instance.GenerateColorsFromColorRamp(
                                                colorScheme, breaks);
    var classBreaks = new List<CIMColorClassBreak>();
    var min = cbr.Breaks[0].UpperBound;
    var max = cbr.Breaks[cbr.Breaks.Count() - 1].UpperBound;
    var step = (max - min) / (double)breaks;
    
    //add in the class breaks
    double upper = min;
    for (int b = 1; b <= breaks; b++)
    {
      double lower = upper;
      upper = b == breaks ? max : min + (b * step);
      var cb = new CIMColorClassBreak()
      {
        UpperBound = upper,
        Label = string.Format("{0:#0.0#} - {1:#0.0#}", lower, upper),
        Color = colors[b - 1]
      };
      classBreaks.Add(cb);
    }
    cbr.Breaks = classBreaks.ToArray();
    pcsl.SetRenderer(cbr);
    
    Inheritance Hierarchy

    System.Object
       ArcGIS.Desktop.Framework.Contracts.PropertyChangedBase
          ArcGIS.Desktop.Mapping.StyleItem
             ArcGIS.Desktop.Mapping.ColorRampStyleItem

    Requirements

    Target Platforms: Windows 11, Windows 10, Windows 8.1

    See Also